Log in

Relevant bibliographies by topics / Polarimetric signature / Journal articles

To see the other types of publications on this topic, follow the link: Polarimetric signature.

Journal articles on the topic 'Polarimetric signature'

Author: Grafiati

Published: 25 May 2024

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Polarimetric signature.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Takahashi, J., Y. Itoh, T. Matsuo, Y. Oasa, Y. P. Bach, and M. Ishiguro. "Polarimetric signature of the oceans as detected by near-infrared Earthshine observations." Astronomy & Astrophysics 653 (September 2021): A99. http://dx.doi.org/10.1051/0004-6361/202039331.

Full text

Abstract:

Context. The discovery of an extrasolar planet with an ocean has crucial importance in the search for life beyond Earth. The polarimetric detection of specularly reflected light from a smooth liquid surface is anticipated theoretically, though the polarimetric signature of Earth’s oceans has not yet been conclusively detected in disk-integrated planetary light. Aims. We aim to detect and measure the polarimetric signature of the Earth’s oceans. Methods. We conducted near-infrared polarimetry for lunar Earthshine and collected data on 32 nights with a variety of ocean fractions in the Earthshin

APA, Harvard, Vancouver, ISO, and other styles

2

Ryzhkov, Alexander V., Terry J. Schuur, Donald W. Burgess, and Dusan S. Zrnic. "Polarimetric Tornado Detection." Journal of Applied Meteorology 44, no. 5 (2005): 557–70. http://dx.doi.org/10.1175/jam2235.1.

Full text

Abstract:

Abstract Polarimetric radars are shown to be capable of tornado detection through the recognition of tornadic debris signatures that are characterized by the anomalously low cross-correlation coefficient ρhv and differential reflectivity ZDR. This capability is demonstrated for three significant tornadic storms that struck the Oklahoma City, Oklahoma, metropolitan area. The first tornadic debris signature, based on the measurements with the National Severe Storms Laboratory’s Cimarron polarimetric radar, was reported for a storm on 3 May 1999. Similar signatures were identified for two signifi

APA, Harvard, Vancouver, ISO, and other styles

3

Snyder, Jeffrey C., Howard B. Bluestein, Vijay Venkatesh, and Stephen J. Frasier. "Observations of Polarimetric Signatures in Supercells by an X-Band Mobile Doppler Radar." Monthly Weather Review 141, no. 1 (2013): 3–29. http://dx.doi.org/10.1175/mwr-d-12-00068.1.

Full text

Abstract:

Abstract Polarimetric weather radars significantly enhance the capability to infer the properties of scatterers within a resolution volume. Previous studies have identified several consistently seen polarimetric signatures in supercells observed in the central United States. Nearly all of these studies used data collected by fixed-site S- and C-band radars. Because there are few polarimetric mobile radars, relatively little has been documented in high-resolution polarimetric data from mobile radars. Compared to S and C bands, there has been very limited examination of polarimetric signatures a

APA, Harvard, Vancouver, ISO, and other styles

4

Vyas, A., and B. Sashtri. "SAR POLARIMETRIC SIGNATURES FOR URBAN TARGETS – POLARIMETRIC SIGNATURE CALCULATION AND VISUALIZATION." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XXXIX-B7 (August 2, 2012): 535–40. http://dx.doi.org/10.5194/isprsarchives-xxxix-b7-535-2012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Kumjian, Matthew R., and Alexander V. Ryzhkov. "Polarimetric Signatures in Supercell Thunderstorms." Journal of Applied Meteorology and Climatology 47, no. 7 (2008): 1940–61. http://dx.doi.org/10.1175/2007jamc1874.1.

Full text

Abstract:

Abstract Data from polarimetric radars offer remarkable insight into the microphysics of convective storms. Numerous tornadic and nontornadic supercell thunderstorms have been observed by the research polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) in Norman, Oklahoma (KOUN); additional storm data come from the Enterprise Electronics Corporation “Sidpol” C-band polarimetric radar in Enterprise, Alabama, as well as the King City C-band polarimetric radar in Ontario, Canada. A number of distinctive polarimetric signatures are repeatedly found in each of these storms. The forward-f

APA, Harvard, Vancouver, ISO, and other styles

6

Johnson, Marcus, Youngsun Jung, Daniel T. Dawson, and Ming Xue. "Comparison of Simulated Polarimetric Signatures in Idealized Supercell Storms Using Two-Moment Bulk Microphysics Schemes in WRF." Monthly Weather Review 144, no. 3 (2016): 971–96. http://dx.doi.org/10.1175/mwr-d-15-0233.1.

Full text

Abstract:

Abstract Microphysics parameterization becomes increasingly important as the model grid spacing increases toward convection-resolving scales. The performance of several partially or fully two-moment (2M) schemes within the Weather Research and Forecasting (WRF) Model, version 3.5.1, chosen because of their well-documented advantages over one-moment (1M) schemes, is evaluated with respect to their ability in producing the well-known polarimetric radar signatures found within supercell storms. Such signatures include the ZDR and KDP columns, the ZDR arc, the midlevel ZDR and ρHV rings, the hail

APA, Harvard, Vancouver, ISO, and other styles

7

Van Den Broeke, Matthew S. "Polarimetric Tornadic Debris Signature Variability and Debris Fallout Signatures." Journal of Applied Meteorology and Climatology 54, no. 12 (2015): 2389–405. http://dx.doi.org/10.1175/jamc-d-15-0077.1.

Full text

Abstract:

AbstractValues of polarimetric radar variables may vary substantially between and through tornadic debris signature (TDS) events. Tornadoes with higher intensity ratings are associated with higher average and extreme values of reflectivity factor at horizontal polarization ZHH and lower values of copolar cross-correlation coefficient ρhv. Although values of these variables often fluctuate through reported tornado life cycles, ZHH repeatably decreases and ρhv repeatably increases across the volume scan immediately following reported tornado demise. Land cover has a relatively small effect on va

APA, Harvard, Vancouver, ISO, and other styles

8

Andrić, Jelena, Matthew R. Kumjian, Dušan S. Zrnić, Jerry M. Straka, and Valery M. Melnikov. "Polarimetric Signatures above the Melting Layer in Winter Storms: An Observational and Modeling Study." Journal of Applied Meteorology and Climatology 52, no. 3 (2013): 682–700. http://dx.doi.org/10.1175/jamc-d-12-028.1.

Full text

Abstract:

AbstractPolarimetric radar observations above the melting layer in winter storms reveal enhanced differential reflectivity ZDR and specific differential phase shift KDP, collocated with reduced copolar correlation coefficient ρhv; these signatures often appear as isolated “pockets.” High-resolution RHIs and vertical profiles of polarimetric variables were analyzed for a winter storm that occurred in Oklahoma on 27 January 2009, observed with the polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D) in Norman. The ZDR maximum and ρhv minimum are located within the temperature range bet

APA, Harvard, Vancouver, ISO, and other styles

9

Van Den Broeke, Matthew S., and Sabrina T. Jauernic. "Spatial and Temporal Characteristics of Polarimetric Tornadic Debris Signatures." Journal of Applied Meteorology and Climatology 53, no. 10 (2014): 2217–31. http://dx.doi.org/10.1175/jamc-d-14-0094.1.

Full text

Abstract:

AbstractNonmeteorological scatter, including debris lofted by tornadoes, may be detected using the polarimetric radar variables. For the 17 months from January 2012 to May 2013, radar data were examined for each tornado reported in the domain of an operational polarimetric Weather Surveillance Radar-1988 Doppler (WSR-88D). Characteristics of the tornadic debris signature (TDS) were recorded when a signature was present. Approximately 16% of all tornadoes reported in Storm Data were associated with a debris signature, and this proportion is shown to vary regionally. Signatures were more frequen

APA, Harvard, Vancouver, ISO, and other styles

10

Griffin, Casey B., David J. Bodine, and Robert D. Palmer. "Kinematic and Polarimetric Radar Observations of the 10 May 2010, Moore–Choctaw, Oklahoma, Tornadic Debris Signature." Monthly Weather Review 145, no. 7 (2017): 2723–41. http://dx.doi.org/10.1175/mwr-d-16-0344.1.

Full text

Abstract:

Tornadoes are capable of lofting large pieces of debris that present irregular shapes, near-random orientations, and a wide range of dielectric constants to polarimetric radars. The unique polarimetric signature associated with lofted debris is called the tornadic debris signature (TDS). While ties between TDS characteristics and tornado- and storm-scale kinematic processes have been speculated upon or investigated using photogrammetry and single-Doppler analyses, little work has been done to document the three-dimensional wind field associated with the TDS. Data collected by the Oklahoma City

APA, Harvard, Vancouver, ISO, and other styles

11

Pieraccini, M., M. Pisaneschi, L. Noferini, and C. Atzeni. "Polarimetric radar signature of masonry walls." NDT & E International 40, no. 4 (2007): 271–74. http://dx.doi.org/10.1016/j.ndteint.2006.11.004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Richard, D. T., and S. S. Davis. "Lunar dust characterization by polarimetric signature." Astronomy & Astrophysics 483, no. 2 (2008): 643–49. http://dx.doi.org/10.1051/0004-6361:20079108.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Picca, J., and A. Ryzhkov. "A Dual-Wavelength Polarimetric Analysis of the 16 May 2010 Oklahoma City Extreme Hailstorm." Monthly Weather Review 140, no. 4 (2012): 1385–403. http://dx.doi.org/10.1175/mwr-d-11-00112.1.

Full text

Abstract:

A comparative analysis of a supercell hailstorm using simultaneous observations with S-band and C-band polarimetric radars supported by abundant ground-truth reports is presented in this study. The storm occurred on 16 May 2010 and produced a swath of extremely damaging hail across a large portion of the Oklahoma City, Oklahoma, metro area. Hail sizes over 10 cm in diameter and hail drifts upward of 1.5 m in height were reported. Both S-band (KOUN) and C-band [University of Oklahoma Polarimetric Radar for Innovations in Meteorology and Engineering (OU-PRIME)] polarimetric radars in Norman, Okl

APA, Harvard, Vancouver, ISO, and other styles

14

Nasr, Ayman H., and Hind Z. Abdelhamid. "POLARIMETRIC SIGNATURES IDENTIFICATION FOR DIFFERENT FEATURES IN RADARSAT-2 POLSAR IMAGE: A CASE STUDY OF HALAYIB AREA, EGYPT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B7 (June 22, 2016): 851–57. http://dx.doi.org/10.5194/isprs-archives-xli-b7-851-2016.

Full text

Abstract:

In fully polarized SAR (PolSAR) data the returned signal from a target contains all polarizations. More information about this target may be inferred with respect to single-polarization. Distinct polarization separates targets due to its different backscattering responses. A Radarsat-2 PolSAR image acquired on December 2013 of part of Halayib area (Egypt) was used in this study. Polarimetric signatures for various features (Wadi deposits, Tonalite, Chlorite schist, and Radar penetrated areas) were derived and identified. Their Co-polarized and Cross-polarized signatures were generated, based o

APA, Harvard, Vancouver, ISO, and other styles

15

Nasr, Ayman H., and Hind Z. Abdelhamid. "POLARIMETRIC SIGNATURES IDENTIFICATION FOR DIFFERENT FEATURES IN RADARSAT-2 POLSAR IMAGE: A CASE STUDY OF HALAYIB AREA, EGYPT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B7 (June 22, 2016): 851–57. http://dx.doi.org/10.5194/isprsarchives-xli-b7-851-2016.

Full text

Abstract:

In fully polarized SAR (PolSAR) data the returned signal from a target contains all polarizations. More information about this target may be inferred with respect to single-polarization. Distinct polarization separates targets due to its different backscattering responses. A Radarsat-2 PolSAR image acquired on December 2013 of part of Halayib area (Egypt) was used in this study. Polarimetric signatures for various features (Wadi deposits, Tonalite, Chlorite schist, and Radar penetrated areas) were derived and identified. Their Co-polarized and Cross-polarized signatures were generated, based o

APA, Harvard, Vancouver, ISO, and other styles

16

Jung, Youngsun, Ming Xue, and Guifu Zhang. "Simulations of Polarimetric Radar Signatures of a Supercell Storm Using a Two-Moment Bulk Microphysics Scheme." Journal of Applied Meteorology and Climatology 49, no. 1 (2010): 146–63. http://dx.doi.org/10.1175/2009jamc2178.1.

Full text

Abstract:

Abstract A new general polarimetric radar simulator for nonhydrostatic numerical weather prediction (NWP) models has been developed based on rigorous scattering calculations using the T-matrix method for reflectivity, differential reflectivity, specific differential phase, and copolar cross-correlation coefficient. A continuous melting process accounts for the entire spectrum of varying density and dielectric constants. This simulator is able to simulate polarimetric radar measurements at weather radar frequency bands and can take as input the prognostic variables of high-resolution NWP model

APA, Harvard, Vancouver, ISO, and other styles

17

Wang, Yadong, and Tian-You Yu. "Novel Tornado Detection Using an Adaptive Neuro-Fuzzy System with S-Band Polarimetric Weather Radar." Journal of Atmospheric and Oceanic Technology 32, no. 2 (2015): 195–208. http://dx.doi.org/10.1175/jtech-d-14-00096.1.

Full text

Abstract:

AbstractTornado debris signatures (TDS) exhibited in polarimetric measurements have the potential to facilitate tornado detection. The upgrade of the network of S-band Weather Surveillance Radar-1988 Doppler (WSR-88D) to dual polarization was completed recently. Therefore, it is timely to develop a tornado detection algorithm that capitalizes on TDS and integrates with other existing signatures observed in the velocity (shear signature) and Doppler spectrum (spectral signature) fields. In this work, the analysis indicates that TDS are not always present with shear and spectral signatures. A ne

APA, Harvard, Vancouver, ISO, and other styles

18

Trömel, Silke, Alexander V. Ryzhkov, Pengfei Zhang, and Clemens Simmer. "Investigations of Backscatter Differential Phase in the Melting Layer." Journal of Applied Meteorology and Climatology 53, no. 10 (2014): 2344–59. http://dx.doi.org/10.1175/jamc-d-14-0050.1.

Full text

Abstract:

AbstractBackscatter differential phase δ within the melting layer has been identified as a reliably measurable but still underutilized polarimetric variable. Polarimetric radar observations at X band in Germany and S band in the United States are presented that show maximal observed δ of 8.5° at X band but up to 70° at S band. Dual-frequency observations at X and C band in Germany and dual-frequency observations at C and S band in the United States are compared to explore the regional frequency dependencies of the δ signature. Theoretical simulations based on usual assumptions about the microp

APA, Harvard, Vancouver, ISO, and other styles

19

Rogers, George W., Houra Rais, and William L. Cameron. "Polarimetric SAR Signature Detection Using the Cameron Decomposition." IEEE Transactions on Geoscience and Remote Sensing 52, no. 1 (2014): 690–700. http://dx.doi.org/10.1109/tgrs.2013.2243737.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Kumjian, Matthew R., Alexander V. Ryzhkov, Heather D. Reeves, and Terry J. Schuur. "A Dual-Polarization Radar Signature of Hydrometeor Refreezing in Winter Storms." Journal of Applied Meteorology and Climatology 52, no. 11 (2013): 2549–66. http://dx.doi.org/10.1175/jamc-d-12-0311.1.

Full text

Abstract:

AbstractPolarimetric radar measurements in winter storms that produce ice pellets have revealed a unique signature that is indicative of ongoing hydrometeor refreezing. This refreezing signature is observed within the low-level subfreezing air as an enhancement of differential reflectivity ZDR and specific differential phase KDP and a decrease of radar reflectivity factor at horizontal polarization ZH and copolar correlation coefficient ρhv. It is distinct from the overlying melting-layer “brightband” signature and suggests that unique microphysical processes are occurring within the layer of

APA, Harvard, Vancouver, ISO, and other styles

21

Canabal-Carbia, Mónica, Adriana R. Sánchez-Montes, Carla Rodríguez, et al. "Inspection of plant pathologies through pseudocolored images based on polarimetric basis." EPJ Web of Conferences 287 (2023): 03004. http://dx.doi.org/10.1051/epjconf/202328703004.

Full text

Abstract:

The study of the interaction of biological tissue with polarized light leads to relevant information of physical properties (dichroism, retardance and depolarization) of samples. Polarimetric analysis of different characteristics in tissues is useful for applications such us tissue classification, contrast enhancement or pathology detection. By means of polarimetric imaging techniques we can characterize the polarimetric signature of biological samples in a noninvasive and nondestructive way. We have found that depolarization information is of special interest in turbid media such as plant tis

APA, Harvard, Vancouver, ISO, and other styles

22

Porzycka-Strzelczyk, Stanisława, Jacek Strzelczyk, Kamil Szostek, et al. "Information Extraction from Satellite-Based Polarimetric SAR Data Using Simulated Annealing and SIRT Methods and GPU Processing." Energies 15, no. 1 (2021): 72. http://dx.doi.org/10.3390/en15010072.

Full text

Abstract:

The main goal of this research was to propose a new method of polarimetric SAR data decomposition that will extract additional polarimetric information from the Synthetic Aperture Radar (SAR) images compared to other existing decomposition methods. Most of the current decomposition methods are based on scattering, covariance or coherence matrices describing the radar wave-scattering phenomenon represented in a single pixel of an SAR image. A lot of different decomposition methods have been proposed up to now, but the problem is still open since it has no unique solution. In this research, a ne

APA, Harvard, Vancouver, ISO, and other styles

23

Van Den Broeke, Matthew S. "Polarimetric Radar Observations of Biological Scatterers in Hurricanes Irene (2011) and Sandy (2012)." Journal of Atmospheric and Oceanic Technology 30, no. 12 (2013): 2754–67. http://dx.doi.org/10.1175/jtech-d-13-00056.1.

Full text

Abstract:

Abstract Biological scatterers, consisting of birds and insects, may become trapped near the circulation center of tropical cyclones, particularly if a well-developed eyewall is present. These scatterers may be observed using weather radar, where they may appear to the radar operator as areas of light precipitation. Polarimetric radar characteristics of these scatterers, informed by additional observations of known bioscatter, include a combination of very high differential reflectivity (3–7.9 dB) and very low copolar correlation coefficient (0.3–0.8). Polarimetric radar observations of biosca

APA, Harvard, Vancouver, ISO, and other styles

24

Bondur, V. G., T. N. Chimitdorzhiev, A. V. Dmitriev, and P. N. Dagurov. "Spatial anisotropy assessment of the forest vegetation heterogeneity at various azimuth angles of the radar polarimetric sensing." Исследования Земли из Космоса, no. 3 (June 20, 2019): 92–103. http://dx.doi.org/10.31857/s0205-96142019392-103.

Full text

Abstract:

The results of studies to assess the texture of L- and C-band radar polarimetric images obtained from SIR-C and ALOS PALSAR-1 satellites for the analysis of forest vegetation characteristics using different signatures are summarized. A fractal polarization signature is proposed for the study, which allows to estimate the spatial anisotropy of forest vegetation inhomogeneities at different azimuthal angles of radar sensing. In addition, the signature of lacunarity is suggested as a tool for qualitative evaluation of the angular distribution of tree branches. The heterogeneities of forest vegeta

APA, Harvard, Vancouver, ISO, and other styles

25

Kumjian, Matthew R., Dana M. Tobin, Mariko Oue, and Pavlos Kollias. "Microphysical Insights into Ice Pellet Formation Revealed by Fully Polarimetric Ka-Band Doppler Radar." Journal of Applied Meteorology and Climatology 59, no. 10 (2020): 1557–80. http://dx.doi.org/10.1175/jamc-d-20-0054.1.

Full text

Abstract:

AbstractFully polarimetric scanning and vertically pointing Doppler spectral data from the state-of-the-art Stony Brook University Ka-band Scanning Polarimetric Radar (KASPR) are analyzed for a long-duration case of ice pellets over central Long Island in New York from 12 February 2019. Throughout the period of ice pellets, a classic refreezing signature was present, consisting of a secondary enhancement of differential reflectivity ZDR beneath the melting layer within a region of decreasing reflectivity factor at horizontal polarization ZH and reduced copolar correlation coefficient ρhv. The

APA, Harvard, Vancouver, ISO, and other styles

26

Bodine, David J., Robert D. Palmer, and Guifu Zhang. "Dual-Wavelength Polarimetric Radar Analyses of Tornadic Debris Signatures." Journal of Applied Meteorology and Climatology 53, no. 2 (2014): 242–61. http://dx.doi.org/10.1175/jamc-d-13-0189.1.

Full text

Abstract:

AbstractStatistical properties of tornado debris signatures (TDSs) are investigated using S- and C-band polarimetric radar data with comparisons to damage surveys and satellite imagery. Close proximity of the radars to the 10 May 2010 Moore–Oklahoma City, Oklahoma, tornado that was rated as a 4 on the enhanced Fujita scale (EF4) provides a large number of resolution volumes, and good temporal and spatial matching for dual-wavelength comparisons. These comparisons reveal that S-band TDSs exhibit a higher radar reflectivity factor (ZHH) and copolar cross-correlation coefficient (ρhv) than do C-b

APA, Harvard, Vancouver, ISO, and other styles

27

Schiavulli, Domenico, Ali Ghavidel, Adriano Camps, and Maurizio Migliaccio. "GNSS-R Wind-Dependent Polarimetric Signature Over the Ocean." IEEE Geoscience and Remote Sensing Letters 12, no. 12 (2015): 2374–78. http://dx.doi.org/10.1109/lgrs.2015.2477685.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Lee, J. S., E. Krogager, T. L. Ainsworth, and W. M. Boerner. "Polarimetric Analysis of Radar Signature of a Manmade Structure." IEEE Geoscience and Remote Sensing Letters 3, no. 4 (2006): 555–59. http://dx.doi.org/10.1109/lgrs.2006.879564.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Pilorz, Wojciech, and Ewa Łupikasza. "Radar reflectivity signatures and possible lead times of warnings for very large hail in Poland based on data from 2007-2015." Environmental & Socio-economic Studies 8, no. 3 (2020): 34–47. http://dx.doi.org/10.2478/environ-2020-0016.

Full text

Abstract:

AbstractHail involving very large hailstones (maximum diameter ≥ 5 cm), is a rare but very hazardous phenomenon in Poland, and can be forecast using reflectivity signatures. Every year, Poland experiences from one to over a dozen storms with such large hailstones. Despite the current recommendations regarding polarimetric techniques used in hail risk monitoring, Poland does not have a fully polarimetric radar network. Therefore it is essential to check hail detection capabilities using only reflectivity techniques based on individual radar systems involving hail detection algorithms such as Wa

APA, Harvard, Vancouver, ISO, and other styles

30

Chael, Andrew, Alexandru Lupsasca, George N. Wong, and Eliot Quataert. "Black Hole Polarimetry I. A Signature of Electromagnetic Energy Extraction." Astrophysical Journal 958, no. 1 (2023): 65. http://dx.doi.org/10.3847/1538-4357/acf92d.

Full text

Abstract:

Abstract In 1977, Blandford and Znajek showed that the electromagnetic field surrounding a rotating black hole can harvest its spin energy and use it to power a collimated astrophysical jet, such as the one launched from the center of the elliptical galaxy M87. Today, interferometric observations with the Event Horizon Telescope (EHT) are delivering high-resolution, event-horizon-scale, polarimetric images of the supermassive black hole M87* at the jet launching point. These polarimetric images offer an unprecedented window into the electromagnetic field structure around a black hole. In this

APA, Harvard, Vancouver, ISO, and other styles

31

Kumjian, Matthew R., and Alexander V. Ryzhkov. "Storm-Relative Helicity Revealed from Polarimetric Radar Measurements." Journal of the Atmospheric Sciences 66, no. 3 (2009): 667–85. http://dx.doi.org/10.1175/2008jas2815.1.

Full text

Abstract:

Abstract The dual-polarization radar variables are especially sensitive to the microphysical processes of melting and size sorting of precipitation particles. In deep convective storms, polarimetric measurements of such processes can provide information about the airflow in and around the storm that may be used to elucidate storm behavior and evolution. Size sorting mechanisms include differential sedimentation, vertical transport, strong rotation, and wind shear. In particular, winds that veer with increasing height typical of supercell environments cause size sorting that is manifested as an

APA, Harvard, Vancouver, ISO, and other styles

32

Tobin, Dana M., and Matthew R. Kumjian. "Polarimetric Radar and Surface-Based Precipitation-Type Observations of Ice Pellet to Freezing Rain Transitions." Weather and Forecasting 32, no. 6 (2017): 2065–82. http://dx.doi.org/10.1175/waf-d-17-0054.1.

Full text

Abstract:

Abstract Recent studies document a polarimetric radar signature of refreezing. The signature is characterized by a low-level enhancement in differential reflectivity ZDR and a decrease in the copolar correlation coefficient ρhv within a region of decreasing radar reflectivity factor at horizontal polarization ZH toward the ground, called the refreezing layer (RFL). The evolution of the signature is examined during three winter storms in which the surface precipitation-type transitions from ice pellets to freezing rain. A modified quasi-vertical profile (QVP) technique is developed, which creat

APA, Harvard, Vancouver, ISO, and other styles

33

Van Den Broeke, Matthew S., Dana M. Tobin, and Matthew R. Kumjian. "Polarimetric Radar Observations of Precipitation Type and Rate from the 2–3 March 2014 Winter Storm in Oklahoma and Arkansas." Weather and Forecasting 31, no. 4 (2016): 1179–96. http://dx.doi.org/10.1175/waf-d-16-0011.1.

Full text

Abstract:

Abstract A powerful winter storm affected the south-central United States in early March 2014, accompanied by elevated convective cells with hail and high rates of sleet, freezing rain, and snow. During portions of the event the thermal profile exhibited a shallow surface cold layer and warm, unstable air aloft. Precipitation falling into the cold layer refroze into ice pellets and was accompanied by a polarimetric refreezing signature and numerous crowdsourced surface ice pellet reports. Quasi-vertical profiles of the polarimetric variables indicated an enhanced reflectivity factor ZHH below

APA, Harvard, Vancouver, ISO, and other styles

34

Bukovčić, Petar, Dušan Zrnić, and Guifu Zhang. "Winter Precipitation Liquid–Ice Phase Transitions Revealed with Polarimetric Radar and 2DVD Observations in Central Oklahoma." Journal of Applied Meteorology and Climatology 56, no. 5 (2017): 1345–63. http://dx.doi.org/10.1175/jamc-d-16-0239.1.

Full text

Abstract:

AbstractObservations and analysis of an ice–liquid phase precipitation event, collected with an S-band polarimetric KOUN radar and a two-dimensional video disdrometer (2DVD) in central Oklahoma on 20 January 2007, are presented. Using the disdrometer measurements, precipitation is classified either as ice pellets or rain/freezing rain. The disdrometer observations showed fast-falling and slow-falling particles of similar size. The vast majority (>99%) were fast falling with observed velocities close to those of raindrops with similar sizes. In contrast to the smaller particles (<1 mm in

APA, Harvard, Vancouver, ISO, and other styles

35

McKeown, Katherine E., Michael M. French, Kristofer S. Tuftedal, et al. "Rapid-Scan and Polarimetric Radar Observations of the Dissipation of a Violent Tornado on 9 May 2016 near Sulphur, Oklahoma." Monthly Weather Review 148, no. 9 (2020): 3951–71. http://dx.doi.org/10.1175/mwr-d-20-0033.1.

Full text

Abstract:

Abstract Rapid-scan polarimetric data analysis of the dissipation of a likely violent supercell tornado that struck near Sulphur, Oklahoma, on 9 May 2016 is presented. The Rapid X-band Polarimetric Radar was used to obtain data of the tornado at the end of its mature phase and during its entire dissipation phase. The analysis is presented in two parts: dissipation characteristics of the tornadic vortex signature (TVS) associated with the tornado and storm-scale polarimetric features that may be related to processes contributing to tornado dissipation. The TVS exhibited near-surface radial velo

APA, Harvard, Vancouver, ISO, and other styles

36

Griffin, Erica M., Terry J. Schuur, Alexander V. Ryzhkov, Heather D. Reeves, and Joseph C. Picca. "A Polarimetric and Microphysical Investigation of the Northeast Blizzard of 8–9 February 2013." Weather and Forecasting 29, no. 6 (2014): 1271–94. http://dx.doi.org/10.1175/waf-d-14-00056.1.

Full text

Abstract:

Abstract On 8–9 February 2013, the northeastern United States experienced a historic winter weather event ranking among the top five worst blizzards in the region. Heavy snowfall and blizzard conditions occurred from northern New Jersey, inland to New York, and northward through Maine. Storm-total snow accumulations of 30–61 cm were common, with maximum accumulations up to 102 cm and snowfall rates exceeding 15 cm h−1. Dual-polarization radar measurements collected for this winter event provide valuable insights into storm microphysical processes. In this study, polarimetric data from the Weat

APA, Harvard, Vancouver, ISO, and other styles

37

Carlin, Jacob T., and Alexander V. Ryzhkov. "Estimation of Melting-Layer Cooling Rate from Dual-Polarization Radar: Spectral Bin Model Simulations." Journal of Applied Meteorology and Climatology 58, no. 7 (2019): 1485–508. http://dx.doi.org/10.1175/jamc-d-18-0343.1.

Full text

Abstract:

AbstractDiabatic cooling from hydrometeor phase changes in the stratiform melting layer is of great interest to both operational forecasters and modelers for its societal and dynamical consequences. Attempts to estimate the melting-layer cooling rate typically rely on either the budgeting of hydrometeor content estimated from reflectivity Z or model-generated lookup tables scaled by the magnitude of Z in the bright band. Recent advances have been made in developing methods to observe the unique polarimetric characteristics of melting snow and the additional microphysical information they may c

APA, Harvard, Vancouver, ISO, and other styles

38

Schrom, Robert S., Matthew R. Kumjian, and Yinghui Lu. "Polarimetric Radar Signatures of Dendritic Growth Zones within Colorado Winter Storms." Journal of Applied Meteorology and Climatology 54, no. 12 (2015): 2365–88. http://dx.doi.org/10.1175/jamc-d-15-0004.1.

Full text

Abstract:

AbstractX-band polarimetric radar observations of winter storms in northeastern Colorado on 20–21 February, 9 March, and 9 April 2013 are examined. These observations were taken by the Colorado State University–University of Chicago–Illinois State Water Survey (CSU-CHILL) radar during the Front Range Orographic Storms (FROST) project. The polarimetric radar moments of reflectivity factor at horizontal polarization ZH, differential reflectivity ZDR, and specific differential phase KDP exhibited a range of signatures at different times near the −15°C temperature level favored for dendritic ice c

APA, Harvard, Vancouver, ISO, and other styles

39

Palucki, Jennifer L., Michael I. Biggerstaff, Donald R. MacGorman, and Terry Schuur. "Comparison between Low-Flash and Non-Lightning-Producing Convective Areas within a Mature Mesoscale Convective System." Weather and Forecasting 26, no. 4 (2011): 468–86. http://dx.doi.org/10.1175/waf-d-10-05012.1.

Full text

Abstract:

Abstract Two small multicellular convective areas within a larger mesoscale convective system that occurred on 20 June 2004 were examined to assess vertical motion, radar reflectivity, and dual-polarimetric signatures between flash and non-flash-producing convection. Both of the convective areas had similar life cycles and general structures. Yet, one case produced two flashes, one of which may have been a cloud-to-ground flash, while the other convective area produced no flashes. The non-lightning-producing case had a higher peak reflectivity up to 6 km. Hence, if a reflectivity-based thresho

APA, Harvard, Vancouver, ISO, and other styles

40

Van Den Broeke, Matthew S. "Bioscatter Characteristics Related to Inversion Variability in Atlantic Basin Tropical Cyclones." Earth Interactions 26, no. 1 (2022): 28–38. http://dx.doi.org/10.1175/ei-d-21-0010.1.

Full text

Abstract:

Abstract Tropical cyclones (TCs) routinely transport organisms at their centers of circulation. The TC center of circulation is also often marked by an inversion, and the height of the inversion base may change as the TC intensifies or weakens. In this study, a dataset of 49 dropsonde-measured inversions in 20 separate Atlantic Ocean TCs is compared with spatiotemporally collocated polarimetric radar measurements of bioscatter. Bioscatter signature maximum altitude is found to be a function of temperature lapse rate across the inversion base (r = 0.473), and higher inversion bases were general

APA, Harvard, Vancouver, ISO, and other styles

41

de Macedo, Carina R., and José C. B. da Silva. "Internal Wave Dark-Band Signatures in ALOS-PALSAR Imagery Revealed by the Standard Deviation of the Co-Polarized Phase Difference." Remote Sensing 12, no. 15 (2020): 2372. http://dx.doi.org/10.3390/rs12152372.

Full text

Abstract:

Analysis of synthetic aperture radar (SAR) images in L-band of short-period internal waves (IWs), and classification of their radar signatures is presented by means of a polarimetric data set from ALOS-PALSAR mission. We choose the polarimetric feature named standard deviation(std) of the co-polarized phase difference (CPD) to identify fundamental differences in SAR signatures of internal waves, and divided them into three different classes, according to their backscattered modulation depths and morphology as well as the std CPD, namely: double-signed, single-negative, and single-positive sign

APA, Harvard, Vancouver, ISO, and other styles

42

Fors, Ane S., Dmitry V. Divine, Anthony P. Doulgeris, Angelika H. H. Renner, and Sebastian Gerland. "Signature of Arctic first-year ice melt pond fraction in X-band SAR imagery." Cryosphere 11, no. 2 (2017): 755–71. http://dx.doi.org/10.5194/tc-11-755-2017.

Full text

Abstract:

Abstract. In this paper we investigate the potential of melt pond fraction retrieval from X-band polarimetric synthetic aperture radar (SAR) on drifting first-year sea ice. Melt pond fractions retrieved from a helicopter-borne camera system were compared to polarimetric features extracted from four dual-polarimetric X-band SAR scenes, revealing significant relationships. The correlations were strongly dependent on wind speed and SAR incidence angle. Co-polarisation ratio was found to be the most promising SAR feature for melt pond fraction estimation at intermediate wind speeds (6. 2 m s−1), w

APA, Harvard, Vancouver, ISO, and other styles

43

Shusse, Yukari, Nobuhiro Takahashi, Katsuhiro Nakagawa, Shinsuke Satoh, and Toshio Iguchi. "Polarimetric Radar Observation of the Melting Layer in a Convective Rainfall System during the Rainy Season over the East China Sea." Journal of Applied Meteorology and Climatology 50, no. 2 (2011): 354–67. http://dx.doi.org/10.1175/2010jamc2469.1.

Full text

Abstract:

Abstract During the rainy season over the East China Sea, convective rainfalls often show melting layer (ML) characteristics in polarimetric radar variables. In this research, the appearance ratio of the ML (the ratio of rainfall area accompanied by polarimetric ML signatures) and the variation in height of the level of the ML signature maximum (MLSM level; defined by the level of the ρhv minimum in the ML) in a convective rainfall region in a rainfall system over the East China Sea observed on 2 June 2006 were studied using C-band polarimetric radar (COBRA). For this analysis, a method of rai

APA, Harvard, Vancouver, ISO, and other styles

44

Johnson, Marcus, Youngsun Jung, Jason A. Milbrandt, Hugh Morrison, and Ming Xue. "Effects of the Representation of Rimed Ice in Bulk Microphysics Schemes on Polarimetric Signatures." Monthly Weather Review 147, no. 10 (2019): 3785–810. http://dx.doi.org/10.1175/mwr-d-18-0398.1.

Full text

Abstract:

Abstract Many flavors of multicategory, multimoment bulk microphysics schemes (BMPs) have various treatments of rimed ice. In this study, we compare three two-moment schemes available in the WRF Model—Milbrandt–Yau (MY2), National Severe Storms Laboratory (NSSL), and the two-category configuration of the Predicted Particle Properties (P3) scheme—focusing on differences in rimed-ice representation and their impacts on surface rain and ice. Idealized supercell simulations are performed. A polarimetric radar data simulator is used to evaluate their ability to reproduce the ZDR arc and hail signat

APA, Harvard, Vancouver, ISO, and other styles

45

Kuznetsov, V. A., and A. A. Potapov. "Texture-fractal analysis of polarimetric images generated by synthetic aperture radar stations." Радиотехника и электроника 68, no. 10 (2023): 941–53. http://dx.doi.org/10.31857/s0033849423100145.

Full text

Abstract:

All currently known methods and methods for the formation of fractalfeatures of polarimetric radar images. Briefly reviewed newtexture-fractal feature – a directional multifractal signature measured morphologically by the iterative covering method. In relation to the analysis of polarimetric images formed by a synthetic aperture radar, a new concept for their processing is proposed, based on the possibility of taking into account the polarization differences of ground-based spatially distributed objects by identifying the multifractal and anisotropic properties of their texture. A variant of i

APA, Harvard, Vancouver, ISO, and other styles

46

Friedrich, Katja, Urs Germann, and Pierre Tabary. "Influence of Ground Clutter Contamination on Polarimetric Radar Parameters." Journal of Atmospheric and Oceanic Technology 26, no. 2 (2009): 251–69. http://dx.doi.org/10.1175/2008jtecha1092.1.

Full text

Abstract:

Abstract The influence of ground clutter contamination on the estimation of polarimetric radar parameters, horizontal reflectivity (Zh), differential reflectivity (Zdr), correlation coefficient (ρhυ), and differential propagation phase (ϕdp) was examined. This study aims to derive the critical level of ground clutter contamination for Zh, Zdr, ρhυ, and ϕdp at which ground clutter influence exceeds predefined precision thresholds. Reference data with minimal ground clutter contamination consist of eight precipitation fields measured during three rain events characterized by stratiform and conve

APA, Harvard, Vancouver, ISO, and other styles

47

Hwang, Jehwan, Zahyun Ku, Jiyeon Jeon, et al. "Polarization-Sensitive and Wide Incidence Angle-Insensitive Fabry–Perot Optical Cavity Bounded by Two Metal Grating Layers." Sensors 20, no. 18 (2020): 5382. http://dx.doi.org/10.3390/s20185382.

Full text

Abstract:

Infrared (IR) polarimetric imaging has attracted attention as a promising technology in many fields. Generally, superpixels consisting of linear polarizer elements at different angles plus IR imaging array are used to obtain the polarized target signature by using the detected polarization-sensitive intensities. However, the spatial arrangement of superpixels across the imaging array may lead to an incorrect polarimetric signature of a target, due to the range of angles from which the incident radiation can be collected by the detector. In this article, we demonstrate the effect of the inciden

APA, Harvard, Vancouver, ISO, and other styles

48

Kumjian, Matthew R., and Olivier P. Prat. "The Impact of Raindrop Collisional Processes on the Polarimetric Radar Variables." Journal of the Atmospheric Sciences 71, no. 8 (2014): 3052–67. http://dx.doi.org/10.1175/jas-d-13-0357.1.

Full text

Abstract:

Abstract The impact of the collisional warm-rain microphysical processes on the polarimetric radar variables is quantified using a coupled microphysics–electromagnetic scattering model. A one-dimensional bin-microphysical rain shaft model that resolves explicitly the evolution of the drop size distribution (DSD) under the influence of collisional coalescence and breakup, drop settling, and aerodynamic breakup is coupled with electromagnetic scattering calculations that simulate vertical profiles of the polarimetric radar variables: reflectivity factor at horizontal polarization ZH, differentia

APA, Harvard, Vancouver, ISO, and other styles

49

Kubicke, Gildas, Christophe Bourlier, and Joseph Saillard. "POLARIMETRIC BISTATIC SIGNATURE OF A FACETED OCTAHEDRON IN HIGH-FREQUENCY DOMAIN." Progress In Electromagnetics Research 71 (2007): 173–209. http://dx.doi.org/10.2528/pier07022801.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Alouini, M., F. Goudail, N. Roux, et al. "Active spectro-polarimetric imaging: signature modeling, imaging demonstrator and target detection." European Physical Journal Applied Physics 42, no. 2 (2008): 129–39. http://dx.doi.org/10.1051/epjap:2008034.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!