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Journal articles on the topic 'Radio meteorology – Southern Hemisphere'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Leroy, Stephen S., Chi O. Ao, and Olga Verkhoglyadova. "Mapping GPS Radio Occultation Data by Bayesian Interpolation." Journal of Atmospheric and Oceanic Technology 29, no. 8 (2012): 1062–74. http://dx.doi.org/10.1175/jtech-d-11-00179.1.

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Abstract Bayesian interpolation for mapping GPS radio occultation data on a sphere is explored and its performance evaluated. Bayesian interpolation is ideally suited to the task of fitting data randomly and nonuniformly distributed with unknown error without overfitting the data. The geopotential height at dry pressure 200 hPa is simulated as data with theoretical distributions of the Challenging Mini-Satellite Payload (CHAMP) and of the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC). The simulated CHAMP data are found to be best fit with a spherical harmonic

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Cucurull, L., R. Atlas, R. Li, M. J. Mueller, and R. N. Hoffman. "An Observing System Simulation Experiment with a Constellation of Radio Occultation Satellites." Monthly Weather Review 146, no. 12 (2018): 4247–59. http://dx.doi.org/10.1175/mwr-d-18-0089.1.

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Abstract Experiments with a global observing system simulation experiment (OSSE) system based on the recent 7-km-resolution NASA nature run (G5NR) were conducted to determine the potential value of proposed Global Navigation Satellite System (GNSS) radio occultation (RO) constellations in current operational numerical weather prediction systems. The RO observations were simulated with the geographic sampling expected from the original planned Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (COSMIC-2) system, with six equatorial (total of ~6000 soundings per day) and s

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Cucurull, L., J. C. Derber, R. Treadon, and R. J. Purser. "Assimilation of Global Positioning System Radio Occultation Observations into NCEP’s Global Data Assimilation System." Monthly Weather Review 135, no. 9 (2007): 3174–93. http://dx.doi.org/10.1175/mwr3461.1.

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Abstract The Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) mission launched six small satellites in April 2006, each carrying a GPS radio occultation (RO) receiver. At final orbit, COSMIC will provide ∼2500–3000 RO soundings per day uniformly distributed around the globe in near–real time. In preparation for the assimilation of COSMIC data in an operational framework, the NCEP/Environmental Modeling Center (EMC) has successfully developed the capability of assimilating profiles of refractivity and bending angle. Each forward operator has been implemented with

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4

Li, Wei, Longqiang Huang, Shaocheng Zhang, and Yanju Chai. "Assessing Global Ionosphere TEC Maps with Satellite Altimetry and Ionospheric Radio Occultation Observations." Sensors 19, no. 24 (2019): 5489. http://dx.doi.org/10.3390/s19245489.

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As global navigation satellite system (GNSS)stations are sparsely distributed in oceanic area, oceanic areas usually have lower precision than continental areas on a global ionosphere maps (GIM). On the other hand, space-borne observations like satellite altimetry (SA) and ionospheric radio occultation (IRO) have substantial dual-frequency observations in oceanic areas, which could be used for total electron content (TEC) retrieval. In this paper, the Jason-2 SA and Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) IRO products were used to assess the precision o

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Cucurull, L., and J. C. Derber. "Operational Implementation of COSMIC Observations into NCEP’s Global Data Assimilation System." Weather and Forecasting 23, no. 4 (2008): 702–11. http://dx.doi.org/10.1175/2008waf2007070.1.

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Abstract The next generation of NCEP’s Global Data Assimilation System became operational on 1 May 2007. This system incorporates the assimilation of global positioning system (GPS) radio occultation (RO) profiles from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission launched in April 2006. Roughly 1 yr after the launch of COSMIC, NCEP has begun operational use of this new dataset. A preliminary assessment of this observation type was performed with an earlier version of NCEP’s analysis at a lower resolution. These experiments showed positive impact w

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Cucurull, L. "Improvement in the Use of an Operational Constellation of GPS Radio Occultation Receivers in Weather Forecasting." Weather and Forecasting 25, no. 2 (2010): 749–67. http://dx.doi.org/10.1175/2009waf2222302.1.

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Abstract As of May 2007, the National Centers for Environmental Prediction (NCEP) implemented a new Global Data Assimilation System. This system incorporated the assimilation of global positioning system (GPS) radio occultation (RO) profiles from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) mission, which was launched in April 2006. Since then, this new type of observation has been shown to provide additional information on the thermodynamic state of the atmosphere, resulting in a significant increase in the model skill. Recent updates of the analysis and

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Tsuda, T. "Global distribution of vertical wavenumber spectra in the lower stratosphere observed using high-vertical-resolution temperature profiles from COSMIC GPS radio occultation." Annales Geophysicae 34, no. 2 (2016): 203–13. http://dx.doi.org/10.5194/angeo-34-203-2016.

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Abstract. We retrieved temperature (T) profiles with a high vertical resolution using the full spectrum inversion (FSI) method from the Constellation Observing System for Meteorology, Ionosphere and Climate (COSMIC) GPS radio occultation (GPS-RO) data from January 2007 to December 2009. We studied the characteristics of temperature perturbations in the stratosphere at 20–27 km altitude. This height range does not include a sharp jump in the background Brunt–Väisälä frequency squared (N2) near the tropopause, and it was reasonably stable regardless of season and latitude. We analyzed the vertic

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Paulik, L. C., and T. Birner. "Quantifying the deep convective temperature signal within the tropical tropopause layer (TTL)." Atmospheric Chemistry and Physics 12, no. 24 (2012): 12183–95. http://dx.doi.org/10.5194/acp-12-12183-2012.

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Abstract. Dynamics on a vast range of spatial and temporal scales, from individual convective plumes to planetary-scale circulations, play a role in driving the temperature variability in the tropical tropopause layer (TTL). Here, we aim to better quantify the deep convective temperature signal within the TTL using multiple datasets. First, we investigate the link between ozone and temperature in the TTL using the Southern Hemisphere Additional Ozonesondes (SHADOZ) dataset. Low ozone concentrations in the TTL are indicative of deep convective transport from the boundary layer. We confirm the u

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9

Salinger, Jim. "Meteorology of the Southern Hemisphere." Agricultural and Forest Meteorology 116, no. 1-2 (2003): 113–15. http://dx.doi.org/10.1016/s0168-1923(02)00250-2.

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10

Karoly, David J., and Dayton G. Vincent. "Meteorology of the Southern Hemisphere." Meteorological Monographs 49 (December 1, 1998): 1–410. http://dx.doi.org/10.1175/0065-9401-27.49.1.

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11

Diamond, Howard J., Neil Plummer, and Kevin Walsh. "Southern Hemisphere Meteorology and Oceanography." Bulletin of the American Meteorological Society 91, no. 2 (2010): 245–50. http://dx.doi.org/10.1175/2009bams2892.1.

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12

Kamal, Sumon, Norbert Jakowski, Mohammed Mainul Hoque, and Jens Wickert. "A High Latitude Model for the E Layer Dominated Ionosphere." Remote Sensing 13, no. 18 (2021): 3769. http://dx.doi.org/10.3390/rs13183769.

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Under certain conditions, the ionization of the E layer can dominate over that of the F2 layer. This phenomenon is called the E layer dominated ionosphere (ELDI) and occurs mainly in the auroral regions. In the present work, we model the variation of the ELDI for the Northern and Southern Hemispheres. Our proposed Neustrelitz ELDI Event Model (NEEM) is an empirical, climatological model that describes ELDI characteristics by means of four submodels for selected model observables, considering the dependencies on appropriate model drivers. The observables include the occurrence probability of EL

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13

Vincent, Dayton G., and Johan van Heerden. "Fifth International Conference on Southern Hemisphere Meteorology and Oceanography." Bulletin of the American Meteorological Society 78, no. 10 (1997): 2227–31. http://dx.doi.org/10.1175/1520-0477-78.10.2227.

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14

Preston, R. A., D. L. Jauncey, D. L. Meier, et al. "The Southern Hemisphere VLBI Experiment (SHEVE)." Symposium - International Astronomical Union 129 (1988): 139–40. http://dx.doi.org/10.1017/s0074180900134308.

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Six radio telescopes were operated as the first southern hemisphere VLBI array in April and May 1982. Observations were made at 2.3 and 8.4 Ghz. This array produced VLBI images of 28 southern hemisphere radio sources, high accuracy VLBI geodesy between southern hemisphere sites, and subarcsecond radio astrometry of celestial sources south of declination −45 degrees. This paper discusses only the astrophysical aspects of the experiment.

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15

Jauncey, D. L., J. E. Reynolds, A. K. Tzioumis, et al. "The Southern Hemisphere VLBI Experiment Program, SHEVE." Symposium - International Astronomical Union 158 (1994): 131–34. http://dx.doi.org/10.1017/s0074180900107430.

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The Southern Hemisphere VLBI Experiment (SHEVE) program is aimed at producing high-resolution images of southern radio sources. The radio telescopes of the present SHEVE array are described below and some recent results presented.

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16

Tingay, S. J., D. L. Jauncey, R. A. Preston, et al. "VLBI Observations of Low-Redshift Radio Galaxies." Symposium - International Astronomical Union 175 (1996): 129–30. http://dx.doi.org/10.1017/s007418090008030x.

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Here we will describe briefly some of the VLBI observations we are making of low-redshift, compact radio sources in the southern hemisphere, using the Southern Hemisphere VLBI Experiment (SHEVE) array of telescopes (Jauncey et al., 1994).

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17

Fey, Alan L., Roopesh Ojha, David L. Jauncey, et al. "Accurate Astrometry of 22 Southern Hemisphere Radio Sources." Astronomical Journal 127, no. 3 (2004): 1791–95. http://dx.doi.org/10.1086/381957.

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18

Johnston, Simon. "Pulsar polarization: the view from the southern hemisphere." Proceedings of the International Astronomical Union 13, S337 (2017): 84–87. http://dx.doi.org/10.1017/s1743921317010389.

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AbstractPulsar polarization has been a fruitful area of study since the first discovery of pulsars 50 years ago. Polarization gives information on the geometry of the star, the location of the radio emission in the magnetosphere, the physics behind the radio emission mechanism and a plethora of phenomenology. Here, I will restrict myself to a brief outline of recent work in pulsar polarization using observations taken with the Parkes radio telescope over the past decade.

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19

Murphy, D. W., S. J. Tingay, R. A. Preston, et al. "VLBI of Southern EGRET Identifications." International Astronomical Union Colloquium 164 (1998): 55–56. http://dx.doi.org/10.1017/s025292110004450x.

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AbstractWe have undertaken VLBI observations of 8 Southern Hemisphere EGRET radio sources. Using our data as well as data obtained from the literature we have examined the difference in radio properties between gamma-ray loud and gamma-ray quiet radio sources. In particular, we find no evidence that gamma-ray loud radio sources lie preferentially in sources with straight radio jets as has been suggested.

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20

Newman, Paul A., Leslie R. Lait, and Mark R. Schoeberl. "The morphology and meteorology of southern hemisphere spring total ozone mini-holes." Geophysical Research Letters 15, no. 8 (1988): 923–26. http://dx.doi.org/10.1029/gl015i008p00923.

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21

Noël, F. "Astrolabe Observations of Radio Stars at the Southern Hemisphere." Symposium - International Astronomical Union 109 (1986): 715–19. http://dx.doi.org/10.1017/s0074180900077238.

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A brief description is given of the program of radio star observations with the Danjon Astrolabe of Santiago. Results in alpha (Astr.-Cat.) for radio star FK4 309, obtained from observations made at its east transit solely, are given for yearly periods of observation from 1976 to 1982. The average mean error of Δα is 0s.006.

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22

Fey, Alan L., Roopesh Ojha, Jonathan F. H. Quick, et al. "Milliarcsecond-Accurate Astrometry of 34 Southern Hemisphere Radio Sources." Astronomical Journal 132, no. 5 (2006): 1944–49. http://dx.doi.org/10.1086/507991.

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23

Dyson, P. L., M. L. Parkinson, A. D. Quach, P. R. Smith, and D. P. Monselesan. "Radio studies of the southern hemisphere high-latitude ionosphere." Advances in Space Research 16, no. 5 (1995): 103–12. http://dx.doi.org/10.1016/0273-1177(95)00178-h.

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24

Dickey, John M., J. H. S. Weston, J. L. Sokoloski, S. D. Vrtilek, and Michael McCollough. "Radio Spectral Index Analysis of Southern Hemisphere Symbiotic Stars." Astrophysical Journal 911, no. 1 (2021): 30. http://dx.doi.org/10.3847/1538-4357/abe774.

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25

Booth, R. S. "A Southern Hemisphere Millimetre Array." International Astronomical Union Colloquium 140 (1994): 413–18. http://dx.doi.org/10.1017/s0252921100020145.

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The southern night sky is a sight of overwhelming beauty. It is hard to forget one’s first view of the night sky from La Silla with the Galactic centre overhead and the brilliant constellations of Sagittarius and Scorpius with their bright stars and copious amounts of dust. In fact for a millimetre astronomer, it is the dust that is so striking and one feels for the first time that one is seeing tangible visual evidence of the intriguing molecular clouds that dominate our discipline.Ironically it is the observation of these southern molecular clouds that have shaped much of millimetre radio as

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26

Chen, S., M. Berton, G. La Mura, et al. "Probing narrow-line Seyfert 1 galaxies in the southern hemisphere." Astronomy & Astrophysics 615 (July 2018): A167. http://dx.doi.org/10.1051/0004-6361/201832678.

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We present a new accurate catalog of narrow-line Seyfert 1 galaxies (NLS1s) in the southern hemisphere from the Six-degree Field Galaxy Survey (6dFGS) final data release, which is currently the most extensive spectroscopic survey available in the southern sky whose database has not yet been systematically explored. We classified 167 sources as NLS1s based on their optical spectral properties. We derived flux-calibrated spectra for the first time that the 6dFGS does not provide. By analyzing these spectra, we obtained strong correlations between the monochromatic luminosity at 5100 Å and the lu

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King, E. A., D. L. Jauncey, J. E. Reynolds, et al. "Southern Hemisphere VLBI Observations of the Expansion of GRO J1655–40." International Astronomical Union Colloquium 163 (1997): 741–42. http://dx.doi.org/10.1017/s0252921100043736.

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AbstractWe present high-resolution radio observations of the second Galactic superluminal radio source GRO1655-40, which was detected as an X-ray transient on 1994 July 27. Our radio radio images reveal two components moving away from each other at an angular speed of 65±5 mas/day, corresponding to superluminal motion (υ/c = 1.4 ± 0.4) at the estimated distance of 3–5 kpc. The 12-day delay between the X-ray and radio outbursts suggests that the ejection of material at relativistic speeds occurs during a stable phase of accretion onto a black hole, which follows an unstable phase with a high ac

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Clark, J. S., I. A. Steele, and R. P. Fender. "Radio observations of IRAS-selected Southern hemisphere classical Be stars." Monthly Notices of the Royal Astronomical Society 299, no. 4 (1998): 1119–22. http://dx.doi.org/10.1046/j.1365-8711.1998.01848.x.

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29

Lovell, J. E. J., P. M. McCulloch, and D. L. Jauncey. "A Radio Survey For Gravitational Lenses In The Southern Hemisphere." Symposium - International Astronomical Union 173 (1996): 403–4. http://dx.doi.org/10.1017/s0074180900231902.

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We are undertaking an imaging survey with the Australia Telescope Compact Array (ATCA) to find gravitational lens candidates in flat-spectrum Parkes Catalogue radio sources. Flat-spectrum radio sources typically possess a single high brightness temperature nucleus of milliarcsecond size. Such sources, if lensed, will show multiply imaged nuclei with separations that are large compared to their milliarcsecond sizes. Our flat-spectrum sample was selected using the criteria α2.7/5.0 > −0.5 (S(v) ∝ vα), S2.7 > 0.34Jy and δ ≤ −20°, and comprises a total of 461 sources.

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Jauncey, David L., G. L. White, B. R. Harvey, et al. "Complete Samples of Flat Spectrum Radio Sources from the Parkes 2.7 GHz Survey." Symposium - International Astronomical Union 129 (1988): 77–78. http://dx.doi.org/10.1017/s007418090013400x.

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We are investigating complete samples of southern hemisphere flat spectrum extra-galactic radio sources drawn from the Parkes 2.7 GHz Survey (see Bolton et al. 1979 and references therein). These samples are being used for a variety of investigations, including a determination of the space distribution and luminosity function of radio QSOs, their radio size distribution, as well as the structures of the individual sources. Accurate positions are being determined, as well, in order to establish an extra-galactic position reference frame in the southern hemisphere.

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de Vegt, Chr, N. Zacharias, K. J. Johnston, and R. Hindsley. "Improving the Reference Frame by Radio–and Optical Astrometry of Radio Stars." International Astronomical Union Colloquium 127 (1991): 246–49. http://dx.doi.org/10.1017/s0252921100063880.

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AbstractA longterm program of precise radio – and optical astrometry of selected radio stars has been conducted in the last decade by our observatories using the VLA and astrographs on both hemispheres. Positions of 54 stars north of −26 deg. declination including 6 MASER stars have been obtained. The program status and some results from the southern hemisphere are reported.

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32

Harnett, J. I., R. F. Haynes, R. Wielebinski, and U. Klein. "Radio Polarization Observations of Three Southern Galaxies." Publications of the Astronomical Society of Australia 8, no. 3 (1990): 257–60. http://dx.doi.org/10.1017/s1323358000023468.

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AbstractObservations of polarized emission and consequently the investigation of magnetic fields in northern galaxies, have been conducted successfully for some time with, for example, the 100-m Effelsberg telescope of the Max-Planck-Institut-für Radioastronomie and the VLA. However, the opportunity to make corresponding studies in the southern hemisphere has only recently become possible. Therefore, we have begun a long-range project aimed at studying the morphology and dynamics of southern galaxies using the facilities of the Parkes and Molonglo radio telescopes, the Siding Spring optical fa

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33

Levy, Gad. "Southern hemisphere low level wind circulation statisticsfrom the Seasat scatterometer." Annales Geophysicae 12, no. 1 (1994): 65–79. http://dx.doi.org/10.1007/s00585-994-0065-9.

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Abstract. Analyses of remotely sensed low-level wind vector data over the Southern Ocean are performed. Five-day averages and monthly means are created and the month-to-month variability during the winter (July-September) of 1978 is investigated. The remotely sensed winds are compared to the Australian Bureau of Meteorology (ABM) and the National Meteorological Center (NMC) surface analyses. In southern latitudes the remotely sensed winds are stronger than what the weather services' analyses suggest, indicating underestimation by ABM and NMC in these regions. The evolution of the low-level jet

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34

Jauncey, David L., Graeme L. White, Bruce R. Harvey, et al. "Mapping The Radio Sky: Compact Radio Quasars From The Parkes 2.7 GHz Survey." Symposium - International Astronomical Union 133 (1988): 487–90. http://dx.doi.org/10.1017/s0074180900140082.

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We are investigating a complete sample of flat-spectrum extragalactic radio quasars drawn from the Parkes 2.7 GHz survey. The sample is being used to map the space distribution of radio quasars and to determine their luminosity function. Accurate positions are being measured for a selection of the brighter quasars in order to establish an extragalactic position reference frame in the Southern Hemisphere.

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Russell, J. L., D. L. Jauncey, B. R. Harvey, et al. "A radio optical reference frame. III - Additional radio and optical positions in the Southern Hemisphere." Astronomical Journal 103 (June 1992): 2090. http://dx.doi.org/10.1086/116213.

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36

Tingay, S. J., J. E. Reynolds, A. K. Tzioumis, et al. "VSOP Space VLBI and Geodetic VLBI Investigations of Southern Hemisphere Radio Sources." Astrophysical Journal Supplement Series 141, no. 2 (2002): 311–35. http://dx.doi.org/10.1086/340783.

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37

Ewing, Tania. "New set of eyes on the radio sky in the Southern Hemisphere." Nature 335, no. 6186 (1988): 108. http://dx.doi.org/10.1038/335108a0.

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38

Fletcher, Jennifer, Shannon Mason, and Christian Jakob. "The Climatology, Meteorology, and Boundary Layer Structure of Marine Cold Air Outbreaks in Both Hemispheres*." Journal of Climate 29, no. 6 (2016): 1999–2014. http://dx.doi.org/10.1175/jcli-d-15-0268.1.

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Abstract A comparison of marine cold air outbreaks (MCAOs) in the Northern and Southern Hemispheres is presented, with attention to their seasonality, frequency of occurrence, and strength as measured by a cold air outbreak index. When considered on a gridpoint-by-gridpoint basis, MCAOs are more severe and more frequent in the Northern Hemisphere (NH) than the Southern Hemisphere (SH) in winter. However, when MCAOs are viewed as individual events regardless of horizontal extent, they occur more frequently in the SH. This is fundamentally because NH MCAOs are larger and stronger than those in t

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Lovell, J. E. J., S. J. Tingay, P. G. Edwards, D. L. Jauncey, and R. A. Preston. "VLBI Observations of Southern EGRET Identifications." Symposium - International Astronomical Union 175 (1996): 19–20. http://dx.doi.org/10.1017/s0074180900079845.

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We present high resolution VLBI images of three southern radio sources: PKS 0208–512, PKS 0521–365 and PKS 0537–441. These sources have been identified as > 100 MeV gamma-ray sources with the Energetic Gamma-Ray Telescope (EGRET) on board the Compton Gamma-Ray Observatory (Thompson et al. 1995). These are the first results in a continuing program of VLBI observations of southern EGRET identifications with the Southern Hemisphere VLBI Experiment (SHEVE) array of telescopes (Jauncey et al., 1994).

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Broderick, J. W., J. J. Bryant, R. W. Hunstead, E. M. Sadler, and T. Murphy. "A new search for distant radio galaxies in the Southern hemisphere – I. Sample definition and radio properties." Monthly Notices of the Royal Astronomical Society 381, no. 1 (2007): 341–66. http://dx.doi.org/10.1111/j.1365-2966.2007.12277.x.

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Urquhart, J. S., A. L. Busfield, M. G. Hoare, et al. "The RMS survey: radio observations of candidate massive YSOs in the southern hemisphere." Proceedings of the International Astronomical Union 2, S237 (2006): 482. http://dx.doi.org/10.1017/s1743921307002700.

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AbstractThe Red MSX Source (RMS) survey (Hoare et al. 2005) is a multi-wavelength programme of follow-up observations designed to distinguish between genuine massive young stellar objects (MYSOs) and other embedded or dusty objects, such as ultra compact (UC) HII regions, evolved stars and planetary nebulae (PNe). We have identified nearly 2000 MYSOs candidates by comparing the colours of MSX and 2MASS point sources to those of known MYSOs. There are several other types of embedded or dust enshrouded objects that have similar colours as MYSOs and contaminate our sample. Two sources of contamin

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Fey, Alan L., Roopesh Ojha, John E. Reynolds, et al. "Astrometry of 25 Southern Hemisphere Radio Sources from a VLBI Short-Baseline Survey." Astronomical Journal 128, no. 5 (2004): 2593–98. http://dx.doi.org/10.1086/424941.

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Titov, O., D. L. Jauncey, H. M. Johnston, R. W. Hunstead, and L. Christensen. "OPTICAL SPECTRA OF CANDIDATE SOUTHERN HEMISPHERE INTERNATIONAL CELESTIAL REFERENCE FRAME (ICRF) RADIO SOURCES." Astronomical Journal 142, no. 5 (2011): 165. http://dx.doi.org/10.1088/0004-6256/142/5/165.

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44

Beck, R., M. Ehle, R. F. Haynes, and J. I. Harnett. "ATCA Radio Polarization Observations of NGC 1566 and NGC 1672." Symposium - International Astronomical Union 158 (1994): 358–60. http://dx.doi.org/10.1017/s0074180900107910.

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NGC 1566 and NGC 1672 have successfully been observed in radio continuum at 6 cm (26″ HPBW) with the Australia Telescope Compact Array (ATCA) using a 375-m array. We have detected for the first time with this telescope linearly polarized radio emission from two southern hemisphere spiral galaxies, NGC 1566 and NGC 1672.

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Biondi, R., A. K. Steiner, G. Kirchengast, and T. Rieckh. "Characterization of thermal structure and conditions for overshooting of tropical and extratropical cyclones with GPS radio occultation." Atmospheric Chemistry and Physics 15, no. 9 (2015): 5181–93. http://dx.doi.org/10.5194/acp-15-5181-2015.

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Abstract. The thermal structure of tropical cyclones (TCs) in different ocean basins is studied using global positioning system (GPS) radio occultation (RO) measurements co-located with TCs' best tracks. The objective of this work is to understand the mutual influence of TCs and atmospheric parameters in different regions. We selected more than 20 000 GPS RO profiles co-located with TCs in a time window of 6 h and space window of 600 km from the TC center in the period 2001–2012 and classified them by intensity of the cyclone and by ocean basin. The results show that TCs have different charact

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Spensberger, Clemens, and Thomas Spengler. "Feature-Based Jet Variability in the Upper Troposphere." Journal of Climate 33, no. 16 (2020): 6849–71. http://dx.doi.org/10.1175/jcli-d-19-0715.1.

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AbstractJets in the upper troposphere constitute a cornerstone of both synoptic meteorology and climate dynamics, providing a direct link between weather and midlatitude climate variability. Conventionally, jet variability is often inferred indirectly through the variability of geopotential or sea level pressure. As recent findings pointed to physical discrepancies of this interpretation for the Southern Hemisphere, this study presents a global overview of jet variability based on automated jet detections in the upper troposphere. Consistent with previous studies, most ocean basins are dominat

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Biondi, R., A. K. Steiner, G. Kirchengast, and T. Rieckh. "A~characterization of thermal structure and conditions for overshooting of tropical and extratropical cyclones with GPS radio occultation." Atmospheric Chemistry and Physics Discussions 14, no. 21 (2014): 29395–428. http://dx.doi.org/10.5194/acpd-14-29395-2014.

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Abstract. The thermal structure of Tropical Cyclones (TCs) in different ocean basins is studied using Global Positioning System (GPS) Radio Occultation (RO) measurements co-located with TCs' best tracks. The objective of this work is to understand the mutual influence of TCs and atmospheric parameters in different regions. We selected more than 20 000 GPS RO profiles co-located with TCs in a time window of 6 h and space window of 600 km from the TC center in the period 2001–2012 and classified them by intensity of the cyclone and by ocean basin. The results show that tropical cyclones have dif

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W Hunstead, Richard. "Accurate Optical Positions for Radio Source Identifications." Australian Journal of Physics 47, no. 5 (1994): 657. http://dx.doi.org/10.1071/ph940657.

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The optical identification of strong radio sources was a key step in establishing a grid of southern hemisphere calibrators, both for Parkes and for Molonglo. However, the measurement of precise positions for these optical counterparts presented some special astrometric problems and led to some novel solutions. This paper summarises the progress of optical position measurement from a radio astronomer's viewpoint and examines the role of the COSMOS database against this background. The source 0007-44, from the first Parkes catalogue, is used as a case study to illustrate the present-day approac

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Anlauf, H., D. Pingel, and A. Rhodin. "Assimilation of GPS radio occultation data at DWD." Atmospheric Measurement Techniques 4, no. 6 (2011): 1105–13. http://dx.doi.org/10.5194/amt-4-1105-2011.

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Abstract. We describe the status of the assimilation of bending angles from GPS radio occultations in the 3D-Var for DWD's operational global forecast model GME ("Global Model for Europe"). Experiments show that the assimilation of GPSRO data leads to a significant reduction of biases in the analyses of temperature, humidity and wind in the upper troposphere and the stratosphere, as well as a better r. m. s. fit in the comparison to radiosondes. The impact on forecasts is most prominent in the data sparse Southern Hemisphere, but is also quite notable in the Northern Hemisphere extra-tropics.

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Anlauf, H., D. Pingel, and A. Rhodin. "Assimilation of GPS radio occultation data at DWD." Atmospheric Measurement Techniques Discussions 4, no. 2 (2011): 1533–54. http://dx.doi.org/10.5194/amtd-4-1533-2011.

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Abstract. We describe the status of the assimilation of bending angles from GPS radio occultations in the 3D-Var for DWD's operational global forecast model GME ("Global Model for Europe"). Experiments show that the assimilation of GPSRO data leads to a significant reduction of biases in the analyses of temperature, humidity and wind in the upper troposphere and the stratosphere, as well as a better r. m. s. fit in the comparison to radiosondes. The impact on forecasts is most prominent in the data sparse Southern Hemisphere, but is also quite notable in the Northern Hemisphere extra-tropics,

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