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Journal articles on the topic 'Observations MOZAIC'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Staufer, J., J. Staehelin, R. Stübi, T. Peter, F. Tummon, and V. Thouret. "Trajectory matching of ozonesondes and MOZAIC measurements in the UTLS – Part 1: Method description and application at Payerne, Switzerland." Atmospheric Measurement Techniques 6, no. 12 (2013): 3393–406. http://dx.doi.org/10.5194/amt-6-3393-2013.

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Abstract. With the aim of improving ozonesonde observations in the upper troposphere/lower stratosphere (UTLS), we use three-dimensional forward and backward trajectories, driven by ERA-Interim wind fields to match and compare ozonesonde measurements at Payerne (Switzerland) with observations from the MOZAIC aircraft program from 1994–2009. The uncertainties associated with the sonde–MOZAIC match technique were assessed using "self-matches", i.e. matches of instruments of the same type, such as MOZAIC–MOZAIC. Despite strong vertical gradients of ozone at the tropopause, which render the match

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2

Staufer, J., J. Staehelin, R. Stübi, T. Peter, F. Tummon, and V. Thouret. "Trajectory matching of ozonesondes and MOZAIC measurements in the UTLS – Part 1: Method description and application at Payerne, Switzerland." Atmospheric Measurement Techniques Discussions 6, no. 4 (2013): 7063–98. http://dx.doi.org/10.5194/amtd-6-7063-2013.

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Abstract. With the aim of improving ozonesonde observations in the upper troposphere/lower stratosphere (UTLS), we use three-dimensional forward and backward trajectories, driven by ERA-Interim wind fields to match and compare ozonesonde measurements at Payerne (Switzerland) with observations from the MOZAIC aircraft program from 1994–2009. The uncertainties associated with the sonde–MOZAIC match technique were assessed using "self-matches", i.e. matches of instruments of the same type, such as MOZAIC–MOZAIC. Despite strong vertical ozone gradients of ozone at the tropopause, which render the

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3

Staufer, J., J. Staehelin, R. Stübi, T. Peter, F. Tummon, and V. Thouret. "Trajectory matching of ozonesondes and MOZAIC measurements in the UTLS – Part 2: Application to the global ozonesonde network." Atmospheric Measurement Techniques 7, no. 1 (2014): 241–66. http://dx.doi.org/10.5194/amt-7-241-2014.

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Abstract. Both balloon-borne electrochemical ozonesondes and MOZAIC (measurements of ozone, water vapour, carbon monoxide and nitrogen oxides by in-service Airbus aircraft) provide very valuable data sets for ozone studies in the upper troposphere/lower stratosphere (UTLS). Although MOZAIC's highly accurate UV-photometers are regularly inspected and recalibrated annually, recent analyses cast some doubt on the long-term stability of their ozone analysers. To investigate this further, we perform a 16 yr comparison (1994–2009) of UTLS ozone measurements from balloon-borne ozonesondes and MOZAIC.

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4

de Laat, A. T. J., I. Aben, M. Deeter, et al. "Validation of nine years of MOPITT V5 NIR using MOZAIC/IAGOS measurements: biases and long-term stability." Atmospheric Measurement Techniques 7, no. 11 (2014): 3783–99. http://dx.doi.org/10.5194/amt-7-3783-2014.

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Abstract. Validation results from a comparison between Measurement Of Pollution In The Troposphere (MOPITT) V5 Near InfraRed (NIR) carbon monoxide (CO) total column measurements and Measurement of Ozone and Water Vapour on Airbus in-service Aircraft (MOZAIC)/In-Service Aircraft for a Global Observing System (IAGOS) aircraft measurements are presented. A good agreement is found between MOPITT and MOZAIC/IAGOS measurements, consistent with results from earlier studies using different validation data and despite large variability in MOPITT CO total columns along the spatial footprint of the MOZAI

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5

de Laat, A. T. J., I. Aben, M. Deeter, et al. "Validation of nine-years of MOPITT V5 NIR using MOZAIC/IAGOS measurements: biases and long term stability." Atmospheric Measurement Techniques Discussions 7, no. 6 (2014): 5251–91. http://dx.doi.org/10.5194/amtd-7-5251-2014.

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Abstract. Validation results from a comparison between Measurement Of Pollution In The Troposphere (MOPITT) V5 Near InfraRed (NIR) Carbon Monoxide (CO) total column measurements and Measurement of Ozone and Water Vapour on Airbus in-service Aircraft (MOZAIC)/In-Service Aircraft for a Global Observing System (IAGOS) aircraft measurements are presented. A good agreement is found between MOPITT and MOZAIC/IAGOS measurements, consistent with results from earlier studies using different validation data and despite large variability in MOPITT CO total columns along the spatial footprint of the MOZAI

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6

Saunois, M., L. Emmons, J. F. Lamarque, et al. "Impact of sampling frequency in the analysis of tropospheric ozone observations." Atmospheric Chemistry and Physics Discussions 11, no. 10 (2011): 27107–37. http://dx.doi.org/10.5194/acpd-11-27107-2011.

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Abstract. The measurements of the ozone vertical profiles are valuable for the evaluation of atmospheric chemistry models and contribute to the understanding of the processes controlling the distribution of tropospheric ozone. The longest record of the ozone vertical profiles is provided by ozone sondes, which have a low time resolution with a typical frequency of 12 or 4 profiles a month. Here we discuss and quantify the uncertainty in the analysis of such data sets using high frequency MOZAIC (Measurements of OZone, water vapor, carbon monoxide and nitrogen oxides by in-service AIrbus airCra

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7

Emmons, L. K., D. P. Edwards, M. N. Deeter, et al. "Measurements of Pollution In The Troposphere (MOPITT) validation through 2006." Atmospheric Chemistry and Physics 9, no. 5 (2009): 1795–803. http://dx.doi.org/10.5194/acp-9-1795-2009.

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Abstract. Comparisons of aircraft measurements of carbon monoxide (CO) to the retrievals of CO using observations from the Measurements of Pollution in The Troposphere (MOPITT) instrument onboard the Terra satellite are presented. Observations made as part of the NASA INTEX-B and NSF MIRAGE field campaigns during March–May 2006 are used to validate the MOPITT CO retrievals, along with routine samples from 2001 through 2006 from NOAA and the MOZAIC measurements from commercial aircraft. A significant positive bias, around 20% for total column CO, in MOPITT CO was found in the comparison to in s

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8

Richards, N. A. D., Q. Li, K. W. Bowman, et al. "Assimilation of TES CO into a global CTM: first results." Atmospheric Chemistry and Physics Discussions 6, no. 6 (2006): 11727–43. http://dx.doi.org/10.5194/acpd-6-11727-2006.

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Abstract. We present results from the first assimilation of carbon monoxide (CO) observations from the Tropospheric Emission Spectrometer (TES) into a global three-dimensional (3-D) chemistry and transport model (CTM). A sequential sub-optimal Kalman filter assimilation scheme (Khattatov et al., 2000) was applied to assimilate TES CO profiles during November 2004 into the GEOS-Chem global 3-D CTM. The assimilation results were compared with MOPITT and MOZAIC observations. The assimilation significantly improves model simulation of CO in the middle to upper troposphere, where the MOPITT versus

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9

Smit, H. G. J., S. Rohs, P. Neis, et al. "Technical Note: Reanalysis of upper troposphere humidity data from the MOZAIC programme for the period 1994 to 2009." Atmospheric Chemistry and Physics Discussions 14, no. 13 (2014): 18905–42. http://dx.doi.org/10.5194/acpd-14-18905-2014.

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Abstract. In-situ observational data on the relative humidity (RH) in the upper troposphere and lowermost stratosphere (UT/LS), or tropopause region, respectively, collected aboard civil passenger aircraft in the MOZAIC (Measurements of OZone, water vapour, carbon monoxide and nitrogen oxides by in-service AIrbus airCraft) programme were reanalysed for the period 2000 to 2009. Previous analyses of probability distribution functions (PDF) of upper troposphere humidity (UTH) data from MOZAIC observations from year 2000 and later indicated a bias of UTH data towards higher RH values compared to d

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10

Emmons, L. K., D. P. Edwards, M. N. Deeter, et al. "Measurements of Pollution In The Troposphere (MOPITT) validation through 2006." Atmospheric Chemistry and Physics Discussions 8, no. 5 (2008): 18091–109. http://dx.doi.org/10.5194/acpd-8-18091-2008.

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Abstract. Comparisons of aircraft measurements of carbon monoxide (CO) to the retrievals of CO using observations from the Measurements of Pollution in The Troposphere (MOPITT) instrument onboard the Terra satellite are presented. Observations made as part of the NASA INTEX-B and NSF MIRAGE field campaigns during March–May 2006 are used to validate the MOPITT CO retrievals, along with routine samples from 2001 through 2006 from NOAA and the MOZAIC measurements from commercial aircraft. A significant positive bias, around 20% for total column CO, in MOPITT CO was found in the comparison to in s

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11

Smit, H. G. J., S. Rohs, P. Neis, et al. "Technical Note: Reanalysis of upper troposphere humidity data from the MOZAIC programme for the period 1994 to 2009." Atmospheric Chemistry and Physics 14, no. 23 (2014): 13241–55. http://dx.doi.org/10.5194/acp-14-13241-2014.

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Abstract. In situ observational data on the relative humidity (RH) in the upper troposphere and lowermost stratosphere (UT/LS), or tropopause region, collected aboard civil passenger aircraft in the MOZAIC (Measurements of OZone, water vapour, carbon monoxide and nitrogen oxides by in-service AIrbus airCraft) programme were reanalysed for the period 2000 to 2009. Previous analyses of probability distribution functions (PDFs) of upper troposphere humidity (UTH) data from MOZAIC observations from year 2000 and later indicated a bias of UTH data towards higher RH values compared to data of the pe

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12

Cammas, J. P., J. Brioude, J. P. Chaboureau, et al. "Injection in the lower stratosphere of biomass fire emissions followed by long-range transport: a MOZAIC case study." Atmospheric Chemistry and Physics 9, no. 15 (2009): 5829–46. http://dx.doi.org/10.5194/acp-9-5829-2009.

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Abstract. This paper analyses a stratospheric injection by deep convection of biomass fire emissions over North America (Alaska, Yukon and Northwest Territories) on 24 June 2004 and its long-range transport over the eastern coast of the United States and the eastern Atlantic. The case study is based on airborne MOZAIC observations of ozone, carbon monoxide, nitrogen oxides and water vapour during the crossing of the southernmost tip of an upper level trough over the Eastern Atlantic on 30 June and on a vertical profile over Washington DC on 30 June, and on lidar observations of aerosol backsca

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13

Cammas, J. P., J. Brioude, J. P. Chaboureau, et al. "Injection in the lower stratosphere of biomass fire emissions followed by long-range transport: a MOZAIC case study." Atmospheric Chemistry and Physics Discussions 8, no. 6 (2008): 20925–64. http://dx.doi.org/10.5194/acpd-8-20925-2008.

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Abstract. This paper analyses a stratospheric injection by deep convection of biomass fire emissions over North America (Alaska, Yukon and Northwest Territories) on 24 June 2004 and its long-range transport over the eastern coast of the United States and the eastern Atlantic. The case study is done using MOZAIC observations of ozone, carbon monoxide, nitrogen oxides (NOx+PAN) and water vapour during the crossing of the southernmost tip of an upper level trough over the Eastern Atlantic on 30 June 03:00 UTC and 10:00 UTC and in a vertical profile over Washington DC on 30 June 17:00 UTC, and by

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14

El Amraoui, L., J. L. Attié, N. Semane, et al. "Midlatitude stratosphere – troposphere exchange as diagnosed by MLS O<sub>3</sub> and MOPITT CO assimilated fields." Atmospheric Chemistry and Physics 10, no. 5 (2010): 2175–94. http://dx.doi.org/10.5194/acp-10-2175-2010.

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Abstract. This paper presents a comprehensive characterization of a very deep stratospheric intrusion which occurred over the British Isles on 15 August 2007. The signature of this event is diagnosed using ozonesonde measurements over Lerwick, UK (60.14° N, 1.19° W) and is also well characterized using meteorological analyses from the global operational weather prediction model of Météo-France, ARPEGE. Modelled as well as assimilated fields of both ozone (O3) and carbon monoxide (CO) have been used in order to better document this event. O3 and CO from Aura/MLS and Terra/MOPITT instruments, re

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15

Neis, P., H. G. J. Smit, M. Krämer, N. Spelten, and A. Petzold. "Evaluation of the MOZAIC Capacitive Hygrometer during the airborne field study CIRRUS-III." Atmospheric Measurement Techniques Discussions 7, no. 9 (2014): 9803–38. http://dx.doi.org/10.5194/amtd-7-9803-2014.

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Abstract. The MOZAIC Capacitive Hygrometer (MCH) is usually operated onboard of passenger aircraft in the framework of MOZAIC (Measurement of Ozone by AIRBUS In-Service Aircraft). In order to evaluate the performance of the MCH, it was operated aboard a Learjet 35A aircraft as part of the CIRRUS-III field study together with a closed-cell Lyman-α fluorescence hygrometer (FISH) and an open path tunable diode laser system (OJSTER) for water vapour measurement. After reducing the data set to MOZAIC-relevant conditions, the 1Hz relative humidity (RH) cross correlation between MCH and reference ins

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16

Asman, W. A. H., M. G. Lawrence, C. A. M. Brenninkmeijer, P. J. Crutzen, J. W. M. Cuijpers, and P. Nédélec. "Rarity of upper-tropospheric low O<sub>3</sub> concentration events during MOZAIC flights." Atmospheric Chemistry and Physics Discussions 3, no. 2 (2003): 1631–50. http://dx.doi.org/10.5194/acpd-3-1631-2003.

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Abstract. Only a few previous observations of very low O3 concentrations in the upper troposphere are available. The aim of this study was to examine the rich MOZAIC data set for more. Flights with at least 25 4 s averaged concentrations less than 8 ppbv at pressures lower than 500 hPa measured using commercial aircraft within the MOZAIC project have been analysed. There are eleven flights that fulfill these conditions (excluding artefacts as discussed below), representing about 0.001% of all measurements during the analyzed period August 1994–December 1997. The low O3 events occurred over Sou

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17

Borsdorff, Tobias, Joost aan de Brugh, Haili Hu, Philippe Nédélec, Ilse Aben, and Jochen Landgraf. "Carbon monoxide column retrieval for clear-sky and cloudy atmospheres: a full-mission data set from SCIAMACHY 2.3 µm reflectance measurements." Atmospheric Measurement Techniques 10, no. 5 (2017): 1769–82. http://dx.doi.org/10.5194/amt-10-1769-2017.

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Abstract. We discuss the retrieval of carbon monoxide (CO) vertical column densities from clear-sky and cloud contaminated 2311–2338 nm reflectance spectra measured by the Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) from January 2003 until the end of the mission in April 2012. These data were processed with the Shortwave Infrared CO Retrieval algorithm (SICOR) that we developed for the operational data processing of the Tropospheric Monitoring Instrument (TROPOMI) that will be launched on ESA's Sentinel-5 Precursor (S5P) mission. This study complements pre

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18

Claeyman, M., J. L. Attié, L. El Amraoui, et al. "A linear CO chemistry parameterization in a chemistry-transport model: evaluation and application to data assimilation." Atmospheric Chemistry and Physics 10, no. 13 (2010): 6097–115. http://dx.doi.org/10.5194/acp-10-6097-2010.

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Abstract. This paper presents an evaluation of a new linear parameterization valid for the troposphere and the stratosphere, based on a first order approximation of the carbon monoxide (CO) continuity equation. This linear scheme (hereinafter noted LINCO) has been implemented in the 3-D Chemical Transport Model (CTM) MOCAGE (MOdèle de Chimie Atmospherique Grande Echelle). First, a one and a half years of LINCO simulation has been compared to output obtained from a detailed chemical scheme output. The mean differences between both schemes are about ±25 ppbv (part per billion by volume) or 15% i

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19

Saunois, M., L. Emmons, J. F. Lamarque, et al. "Impact of sampling frequency in the analysis of tropospheric ozone observations." Atmospheric Chemistry and Physics 12, no. 15 (2012): 6757–73. http://dx.doi.org/10.5194/acp-12-6757-2012.

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Abstract. Measurements of ozone vertical profiles are valuable for the evaluation of atmospheric chemistry models and contribute to the understanding of the processes controlling the distribution of tropospheric ozone. The longest record of ozone vertical profiles is provided by ozone sondes, which have a typical frequency of 4 to 12 profiles a month. Here we quantify the uncertainty introduced by low frequency sampling in the determination of means and trends. To do this, the high frequency MOZAIC (Measurements of OZone, water vapor, carbon monoxide and nitrogen oxides by in-service AIrbus ai

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20

de Laat, A. T. J., R. Dijkstra, H. Schrijver, P. Nédélec, and I. Aben. "Validation of six years of SCIAMACHY carbon monoxide observations using MOZAIC CO profile measurements." Atmospheric Measurement Techniques 5, no. 9 (2012): 2133–42. http://dx.doi.org/10.5194/amt-5-2133-2012.

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Abstract. This paper presents a validation study of SCanning Imaging Absorption SpectroMeter for Atmospheric CartograpHY (SCIAMACHY) carbon monoxide (CO) total column measurements from the Iterative Maximum Likelihood Method (IMLM) algorithm using vertically integrated profile aircraft measurements obtained within the MOZAIC project for the six year time period of 2003–2008. Overall we find a good agreement between SCIAMACHY and airborne measurements for both mean values – also on a year-to-year basis – as well as seasonal variations. Several locations show large biases that are attributed to

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21

de Laat, A. T. J., R. Dijkstra, H. Schrijver, P. Nédélec, and I. Aben. "Validation of six years of SCIAMACHY carbon monoxide observations using MOZAIC CO profile measurements." Atmospheric Measurement Techniques Discussions 5, no. 1 (2012): 1985–2010. http://dx.doi.org/10.5194/amtd-5-1985-2012.

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Abstract. This paper presents a validation study of SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) carbon monoxide (CO) total column measurements from the Iterative Maximum Likelihood Method (IMLM) algorithm using vertically integrated profile aircraft measurements obtained within the MOZAIC project for the six year time period of 2003–2008. Overall we find a good agreement between SCIAMACHY and airborne measurements for both mean values – also on a year-to-year basis – as well as seasonal variations. Several locations show large biases that are attributed to

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22

Clark, H. L., M. L. Cathala, H. TeysséDre, J. P. Cammas, and V. H. Peuch. "Cross-tropopause fluxes of ozone using assimilation of MOZAIC observations in a global CTM." Tellus B: Chemical and Physical Meteorology 59, no. 1 (2007): 39–49. http://dx.doi.org/10.1111/j.1600-0889.2006.00227.x.

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Sauvage, B., R. V. Martin, A. van Donkelaar, et al. "Remote sensed and in situ constraints on processes affecting tropical tropospheric ozone." Atmospheric Chemistry and Physics 7, no. 3 (2007): 815–38. http://dx.doi.org/10.5194/acp-7-815-2007.

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Abstract. We use a global chemical transport model (GEOS-Chem) to evaluate the consistency of satellite measurements of lightning flashes and ozone precursors with in situ measurements of tropical tropospheric ozone. The measurements are tropospheric O3, NO2, and HCHO columns from the GOME satellite instrument, lightning flashes from the OTD and LIS satellite instruments, profiles of O3, CO, and relative humidity from the MOZAIC aircraft program, and profiles of O3 from the SHADOZ ozonesonde network. We interpret these multiple data sources with our model to better understand what controls tro

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Safieddine, S., A. Boynard, N. Hao, et al. "Tropospheric Ozone Variability during the East Asian Summer Monsoon as Observed by Satellite (IASI), Aircraft (MOZAIC) and Ground Stations." Atmospheric Chemistry and Physics Discussions 15, no. 21 (2015): 31925–50. http://dx.doi.org/10.5194/acpd-15-31925-2015.

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Abstract. Satellite measurements from the thermal Infrared Atmospheric Sounding Interferometer (IASI), the Measurements of OZone and water vapor by in-service AIrbus airCraft (MOZAIC), as well as observations from ground based stations, are used to assess the tropospheric ozone (O3) variability during the East Asian Summer Monsoon (EASM). Six years [2008–2013] of IASI data analysis reveals the ability of the instrument to detect the onset and the progression of the monsoon reflected by a decrease in the tropospheric [0–6] km O3 column due to the EASM, and to reproduce this decrease from one ye

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Asman, W. A. H., M. G. Lawrence, C. A. M. Brenninkmeijer, P. J. Crutzen, J. W. M. Cuijpers, and P. Nédélec. "Rarity of upper-tropospheric low O<sub>3</sub> mixing ratio events during MOZAIC flights." Atmospheric Chemistry and Physics 3, no. 5 (2003): 1541–49. http://dx.doi.org/10.5194/acp-3-1541-2003.

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Abstract. Only a few previous observations of very low O3 mixing ratios in the upper troposphere are available. The aim of this study was to examine the rich MOZAIC data set for more. Flights with at least 25 4 s averaged mixing ratios less than 8 ppbv at pressures lower than 500 hPa measured using commercial aircraft within the MOZAIC project have been analysed. There are eleven flights that fulfil these conditions (excluding artefacts as discussed below), representing about 0.001% of all measurements during the analysed period August 1994-December 1997. The low O3 events occurred over Southe

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El Amraoui, L., J. L. Attié, P. Ricaud, et al. "Tropospheric CO vertical profiles deduced from total columns using data assimilation: methodology and validation." Atmospheric Measurement Techniques 7, no. 9 (2014): 3035–57. http://dx.doi.org/10.5194/amt-7-3035-2014.

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Abstract. This paper presents a validation of a method to derive the vertical profile of carbon monoxide (CO) from its total column using data assimilation. We choose version 3 of MOPITT CO total columns to validate the proposed method. MOPITT products have the advantage of providing both the vertical profiles and the total columns of CO. Furthermore, this version has been extensively validated by comparison with many independent data sets, and has been used in many scientific studies. The first step of the paper consists in the specification of the observation errors based on the chi-square (

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Barrie, Leonard, Valerie Thouret, and Andreas Petzold. "The 2014 MOZAIC–IAGOS 20th Anniversary Scientific Symposium on Atmospheric Composition Observations by Commercial Aircraft." Tellus B: Chemical and Physical Meteorology 67, no. 1 (2015): 29777. http://dx.doi.org/10.3402/tellusb.v67.29777.

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Chevalier, A., F. Gheusi, J. L. Attié, et al. "Carbon monoxide observations from ground stations in France and Europe and long trends in the free troposphere." Atmospheric Chemistry and Physics Discussions 8, no. 1 (2008): 3313–56. http://dx.doi.org/10.5194/acpd-8-3313-2008.

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Abstract. Continuous CO measurements performed at 3 high-altitude stations in France are analyzed for the first time. Data are provided by the new PAES (Pollution Atmospherique à l'Echelle Synoptique) network since 2002 for the Puy de Dôme and 2004 for the Pic du Midi and the Donon. CO measurements of 5 another European stations have been analysed to put the PAES stations in an European perspective. The January 2002–April 2005 CO mean levels of surface stations capture the stratification revealed by climatological CO profiles from the airborne observation system MOZAIC (Measurement of OZone an

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Hayashida, S., X. Liu, A. Ono, K. Yang, and K. Chance. "Observation of ozone enhancement in the lower troposphere over East Asia from a space-borne ultraviolet spectrometer." Atmospheric Chemistry and Physics 15, no. 17 (2015): 9865–81. http://dx.doi.org/10.5194/acp-15-9865-2015.

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Abstract. We report observations from space using ultraviolet (UV) radiance for significant enhancement of ozone in the lower troposphere over central and eastern China (CEC). The recent retrieval products of the Ozone Monitoring Instrument (OMI) onboard the Earth Observing System (EOS) Aura satellite revealed the spatial and temporal variation of ozone distributions in multiple layers in the troposphere. We compared the OMI-derived ozone over Beijing with airborne measurements by the Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program. The correlation between O

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Barret, B., J. E. Williams, I. Bouarar, et al. "Impact of West African Monsoon convective transport and lightning NO<sub>x</sub> production upon the upper tropospheric composition: a multi-model study." Atmospheric Chemistry and Physics Discussions 10, no. 2 (2010): 2245–302. http://dx.doi.org/10.5194/acpd-10-2245-2010.

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Abstract. Within the African Monsoon Multidisciplinary Analysis (AMMA), we investigate the impact of nitrogen oxides produced by lightning (LiNOx) and convective transport during the West African Monsoon (WAM) upon the composition of the upper troposphere (UT) in the tropics. For this purpose, we have performed simulations with 4 state-of-the-art chemistry transport models involved within AMMA, namely MOCAGE, TM4, LMDz-INCA and p-TOMCAT. The model intercomparison is complemented with an evaluation of the simulations based on both spaceborne and airborne observations. The baseline simulations s

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Claeyman, M., J. L. Attié, L. El Amraoui, et al. "A linear CO chemistry parameterization in a chemistry-transport model: evaluation and application to data assimilation." Atmospheric Chemistry and Physics Discussions 10, no. 3 (2010): 6995–7036. http://dx.doi.org/10.5194/acpd-10-6995-2010.

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Abstract. This paper presents an evaluation of a new linear parameterization valid for the troposphere and the stratosphere, based on a first order approximation of the carbon monoxide (CO) continuity equation. This linear scheme (hereinafter noted LINCO) has been implemented in the 3-D Chemical Transport Model (CTM) MOCAGE of Météo-France. On the one hand, a one and a half years of LINCO simulation has been compared to output obtained from a detailed chemical scheme output. In spite of small differences, the seasonal and global CO distributions obtained by both schemes present similar general

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32

Hayashida, S., X. Liu, A. Ono, K. Yang, and K. Chance. "Observation of ozone enhancement in the lower troposphere over East Asia from a space-borne ultraviolet spectrometer." Atmospheric Chemistry and Physics Discussions 15, no. 2 (2015): 2013–54. http://dx.doi.org/10.5194/acpd-15-2013-2015.

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Abstract. We report observations from space using ultraviolet (UV) radiance for significant enhancement of ozone in the lower troposphere over Central and Eastern China (CEC). The recent retrieval products of the Ozone Monitoring Instrument (OMI) onboard the Earth Observing System (EOS)/Aura satellite revealed the spatial and temporal variation of ozone distributions in multiple layers in the troposphere. We compared the OMI-derived ozone over Beijing with airborne measurements by the Measurement of Ozone and Water Vapor by Airbus In-Service Aircraft (MOZAIC) program. The correlation between O

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Barret, B., E. Le Flochmoen, B. Sauvage, E. Pavelin, M. Matricardi, and J. P. Cammas. "The detection of post-monsoon tropospheric ozone variability over south Asia using IASI data." Atmospheric Chemistry and Physics 11, no. 18 (2011): 9533–48. http://dx.doi.org/10.5194/acp-11-9533-2011.

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Abstract. The ozone (O3) variability over south Asia during the 2008 post-monsoon season has been assessed using measurements from the MetOP-A/IASI instrument and O3 profiles retrieved with the SOftware for a Fast Retrieval of IASI Data (SOFRID). The information content study and error analyses carried out in this paper show that IASI Level 1 data can be used to retrieve tropospheric O3 columns (TOC, surface-225 hPa) and UTLS columns (225–70 hPa) with errors smaller than 20%. Validation with global radiosonde O3 profiles obtained during a period of 6 months show the excellent agreement between

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Sauvage, B., V. Thouret, J. P. Cammas, F. Gheusi, G. Athier, and P. Nédélec. "Tropospheric ozone over Equatorial Africa: regional aspects from the MOZAIC data." Atmospheric Chemistry and Physics 5, no. 2 (2005): 311–35. http://dx.doi.org/10.5194/acp-5-311-2005.

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Abstract. We analyze ozone observations recorded over Equatorial Africa between April 1997 and March 2003 by the MOZAIC programme, providing the first ozone climatology deriving from continental in-situ data over this region. Three-dimensional streamlines strongly suggests connections between the characteristics of the ozone monthly mean vertical profiles, the most persistent circulation patterns in the troposphere over Equatorial Africa (on a monthly basis) such as the Harmattan, the African Easterly Jet, the Trades and the regions of ozone precursors emissions by biomass burning. During the

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Barret, B., J. E. Williams, I. Bouarar, et al. "Impact of West African Monsoon convective transport and lightning NO<sub>x</sub> production upon the upper tropospheric composition: a multi-model study." Atmospheric Chemistry and Physics 10, no. 12 (2010): 5719–38. http://dx.doi.org/10.5194/acp-10-5719-2010.

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Abstract. Within the African Monsoon Multidisciplinary Analysis (AMMA), we investigate the impact of nitrogen oxides produced by lightning (LiNOx) and convective transport during the West African Monsoon (WAM) upon the composition of the upper troposphere (UT) in the tropics. For this purpose, we have performed simulations with 4 state-of-the-art chemistry transport models involved within AMMA, namely MOCAGE, TM4, LMDz-INCA and p-TOMCAT. The model intercomparison is complemented with an evaluation of the simulations based on both spaceborne and airborne observations. The baseline simulations s

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Sauvage, B., V. Thouret, J. P. Cammas, F. Gheusi, G. Athier, and P. Nédélec. "Tropospheric ozone over Equatorial Africa: regional aspects from the MOZAIC data." Atmospheric Chemistry and Physics Discussions 4, no. 3 (2004): 3285–332. http://dx.doi.org/10.5194/acpd-4-3285-2004.

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Abstract. We analyze MOZAIC ozone observations recorded over Equatorial Africa, from April 1997 to March 2003 to give the first ozone climatology of this region. The monthly mean vertical profiles have been systematically analyzed with monthly mean ECMWF data using a Lagrangian-model (LAGRANTO). We assess the roles played by the dynamical features of Equatorial Africa and the intense biomass burning sources within the region in defining the ozone distribution. The lower troposphere exhibits layers of enhanced ozone during the biomass burning season in each hemisphere (boreal winter in the nort

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Schnadt Poberaj, C., J. Staehelin, D. Brunner, V. Thouret, and V. Mohnen. "A UT/LS ozone climatology of the nineteen seventies deduced from the GASP aircraft measurement program." Atmospheric Chemistry and Physics 7, no. 22 (2007): 5917–36. http://dx.doi.org/10.5194/acp-7-5917-2007.

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Abstract. We present ozone measurements of the Global Atmospheric Sampling Program (GASP) performed from four commercial and one research aircraft in the late 1970s. The GASP quality assurance and control program was reviewed, and an ozone climatology of the upper troposphere and lower stratosphere (UT/LS) of the years 1975–1979 was built. The data set was estimated to have an overall uncertainty of 9% or 3 ppb whichever is greater for the first two years and 4% or 3 ppb for the remaining years, i.e. after implementation of silicone rubber membranes in the pumps. Two cases of nearly coincident

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Pfister, G. G., D. Parrish, H. Worden, et al. "Characterizing summertime chemical boundary conditions for airmasses entering the US West Coast." Atmospheric Chemistry and Physics Discussions 10, no. 11 (2010): 28909–62. http://dx.doi.org/10.5194/acpd-10-28909-2010.

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Abstract. The objective of this study is to analyze the pollution inflow into California during summertime and how it impacts surface air quality through combined analysis of a suite of observations and global and regional models. The focus is on the transpacific pollution transport investigated by the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission in June 2008. Additional observations include satellite retrievals of carbon monoxide and ozone by the EOS Aura Tropospheric Emissions Spectrometer (TES), aircraft measurements from the MOZAI

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Pfister, G. G., D. D. Parrish, H. Worden, et al. "Characterizing summertime chemical boundary conditions for airmasses entering the US West Coast." Atmospheric Chemistry and Physics 11, no. 4 (2011): 1769–90. http://dx.doi.org/10.5194/acp-11-1769-2011.

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Abstract. The objective of this study is to analyze the pollution inflow into California during summertime and how it impacts surface air quality through combined analysis of a suite of observations and global and regional models. The focus is on the transpacific pollution transport investigated by the NASA Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (ARCTAS) mission in June 2008. Additional observations include satellite retrievals of carbon monoxide and ozone by the EOS Aura Tropospheric Emissions Spectrometer (TES), aircraft measurements from the MOZAI

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Safieddine, Sarah, Anne Boynard, Nan Hao, et al. "Tropospheric ozone variability during the East Asian summer monsoon as observed by satellite (IASI), aircraft (MOZAIC) and ground stations." Atmospheric Chemistry and Physics 16, no. 16 (2016): 10489–500. http://dx.doi.org/10.5194/acp-16-10489-2016.

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Abstract. Satellite measurements from the thermal Infrared Atmospheric Sounding Interferometer (IASI), aircraft data from the MOZAIC/IAGOS project, as well as observations from ground-based stations, are used to assess the tropospheric ozone (O3) variability during the East Asian Summer Monsoon (EASM). Six years 2008–2013 of IASI data analysis reveals the ability of the instrument to detect the onset and the progression of the monsoon seen by a decrease in the tropospheric 0–6 km O3 column due to the EASM, and to reproduce this decrease from one year to the other. The year-to-year variability

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Mizzi, Arthur P., David P. Edwards, and Jeffrey L. Anderson. "Assimilating compact phase space retrievals (CPSRs): comparison with independent observations (MOZAIC in situ and IASI retrievals) and extension to assimilation of truncated retrieval profiles." Geoscientific Model Development 11, no. 9 (2018): 3727–45. http://dx.doi.org/10.5194/gmd-11-3727-2018.

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Abstract. Assimilation of atmospheric composition retrievals presents computational challenges due to their high data volume and often sparse information density. Assimilation of compact phase space retrievals (CPSRs) meets those challenges and offers a promising alternative to assimilation of raw retrievals at reduced computational cost (Mizzi et al., 2016). This paper compares analysis and forecast results from assimilation of Terra/Measurement of Pollution in the Troposphere (MOPITT) carbon monoxide (CO) CPSRs with independent observations. We use MetOp-A/Infrared Atmospheric Sounding Inter

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Sheel, Varun, Jagat Singh Heet Bisht, Lokesh Sahu, and Valérie Thouret. "Spatio-temporal variability of CO and O3in Hyderabad (17°N, 78°E), central India, based on MOZAIC and TES observations and WRF-Chem and MOZART-4 models." Tellus B: Chemical and Physical Meteorology 68, no. 1 (2016): 30545. http://dx.doi.org/10.3402/tellusb.v68.30545.

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Tilmes, S., J. F. Lamarque, L. K. Emmons, et al. "Technical Note: Ozonesonde climatology between 1995 and 2011: description, evaluation and applications." Atmospheric Chemistry and Physics 12, no. 16 (2012): 7475–97. http://dx.doi.org/10.5194/acp-12-7475-2012.

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Abstract. An ozone climatology based on ozonesonde measurements taken over the last 17 yr has been constructed for model evaluation and comparisons to other observations. Vertical ozone profiles for 42 stations around the globe have been compiled for the period 1995–2011, in pressure and tropopause-referenced altitudes. For each profile, the mean, standard deviation, median, the half-width are provided, as well as information about interannual variability. Regional aggregates are formed in combining stations with similar ozone characteristics. The Hellinger distance is introduced as a new diag

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Emili, E., B. Barret, S. Massart, et al. "Combined assimilation of IASI and MLS observations to constrain tropospheric and stratospheric ozone in a global chemical transport model." Atmospheric Chemistry and Physics Discussions 13, no. 8 (2013): 21455–505. http://dx.doi.org/10.5194/acpd-13-21455-2013.

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Abstract. Accurate and temporally resolved fields of free-troposphere ozone are of major importance to quantify the intercontinental transport of pollution and the ozone radiative forcing. In this study we examine the impact of assimilating ozone observations from the Microwave Limb Sounder (MLS) and the Infrared Atmospheric Sounding Interferometer (IASI) in a global chemical transport model (MOdèle de Chimie Atmosphérique à Grande Échelle, MOCAGE). The assimilation of the two instruments is performed by means of a variational algorithm (4-D-VAR) and allows to constrain stratospheric and tropo

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Emili, E., B. Barret, S. Massart, et al. "Combined assimilation of IASI and MLS observations to constrain tropospheric and stratospheric ozone in a global chemical transport model." Atmospheric Chemistry and Physics 14, no. 1 (2014): 177–98. http://dx.doi.org/10.5194/acp-14-177-2014.

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Abstract. Accurate and temporally resolved fields of free-troposphere ozone are of major importance to quantify the intercontinental transport of pollution and the ozone radiative forcing. We consider a global chemical transport model (MOdèle de Chimie Atmosphérique à Grande Échelle, MOCAGE) in combination with a linear ozone chemistry scheme to examine the impact of assimilating observations from the Microwave Limb Sounder (MLS) and the Infrared Atmospheric Sounding Interferometer (IASI). The assimilation of the two instruments is performed by means of a variational algorithm (4D-VAR) and all

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Sheel, Varun, L. K. Sahu, M. Kajino, M. Deushi, O. Stein, and P. Nedelec. "Seasonal and interannual variability of carbon monoxide based on MOZAIC observations, MACC reanalysis, and model simulations over an urban site in India." Journal of Geophysical Research: Atmospheres 119, no. 14 (2014): 9123–41. http://dx.doi.org/10.1002/2013jd021425.

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Sauvage, B., R. V. Martin, A. van Donkelaar, et al. "Remote sensed and in situ constraints on processes affecting tropical tropospheric ozone." Atmospheric Chemistry and Physics Discussions 6, no. 6 (2006): 11465–520. http://dx.doi.org/10.5194/acpd-6-11465-2006.

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Abstract. We use a global chemical transport model (GEOS-Chem) to evaluate the consistency of satellite measurements of lightning flashes and ozone precursors with in situ measurements of tropical tropospheric ozone. The measurements are tropospheric O3, NO2, and HCHO columns from the GOME satellite instrument, lightning flashes from the OTD and LIS instruments, profiles of O3, CO, and relative humidity from the MOZAIC aircraft program, and profiles of O3 from the SHADOZ ozonesonde network. We interpret these multiple data sources with our model to better understand what controls tropical trop

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Yan, Yingying, Jintai Lin, Jinxuan Chen, and Lu Hu. "Improved simulation of tropospheric ozone by a global-multi-regional two-way coupling model system." Atmospheric Chemistry and Physics 16, no. 4 (2016): 2381–400. http://dx.doi.org/10.5194/acp-16-2381-2016.

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Abstract. Small-scale nonlinear chemical and physical processes over pollution source regions affect the tropospheric ozone (O3), but these processes are not captured by current global chemical transport models (CTMs) and chemistry–climate models that are limited by coarse horizontal resolutions (100–500 km, typically 200 km). These models tend to contain large (and mostly positive) tropospheric O3 biases in the Northern Hemisphere. Here we use the recently built two-way coupling system of the GEOS-Chem CTM to simulate the regional and global tropospheric O3 in 2009. The system couples the glo

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Teyssèdre, H., M. Michou, H. L. Clark, et al. "A new chemistry-climate tropospheric and stratospheric model MOCAGE-Climat: evaluation of the present-day climatology and sensitivity to surface processes." Atmospheric Chemistry and Physics Discussions 7, no. 4 (2007): 11295–398. http://dx.doi.org/10.5194/acpd-7-11295-2007.

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Abstract. We present the chemistry-climate configuration of the Météo-France Chemistry and Transport Model, MOCAGE-Climat. MOCAGE-Climat is a state-of-the-art model that simulates the global distribution of ozone and its precursors (82 chemical species) both in the troposphere and the stratosphere, up to the mid-mesosphere (~70 km). Surface processes (emissions, dry deposition), convection, and scavenging are explicitly described in the model that has been driven by the ECMWF operational analyses of the period 2000–2005, on T21 and T42 horizontal grids and 60 hybrid vertical levels, with and w

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Marey, H. S., Z. Hashisho, L. Fu, and J. Gille. "Spatial and temporal variation of CO over Alberta using measurements from satellite, aircrafts, and ground stations." Atmospheric Chemistry and Physics Discussions 14, no. 23 (2014): 31767–812. http://dx.doi.org/10.5194/acpd-14-31767-2014.

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Abstract. Alberta is Canada's largest oil producer and its oil sand deposits comprise 30% of the world's oil reserves. The process of bitumen extraction and upgrading releases trace gases and aerosols to the atmosphere. In this study we present satellite-based analysis to explore, for the first time, various contributing factors that affect tropospheric carbon monoxide (CO) levels over Alberta. The multispectral product that uses both near-infrared (NIR) and the thermal-infrared (TIR) radiances for CO retrieval from the Measurements of Pollution in the Troposphere (MOPITT) are examined for the

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