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Registros recuperados: 5
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An Updated Geophysical Model for AMSR-E and SSMIS Brightness Temperature Simulations over Oceans ArchiMer
Zabolotskikh, Elizaveta; Mitnik, Leonid; Chapron, Bertrand.
In this study, we considered the geophysical model for microwave brightness temperature (BT) simulation for the Atmosphere-Ocean System under non-precipitating conditions. The model is presented as a combination of atmospheric absorption and ocean emission models. We validated this model for two satellite instruments-for Advanced Microwave Sounding Radiometer-Earth Observing System (AMSR-E) onboard Aqua satellite and for Special Sensor Microwave Imager/Sounder (SSMIS) onboard F16 satellite of Defense Meteorological Satellite Program (DMSP) series. We compared simulated BT values with satellite BT measurements for different combinations of various water vapor and oxygen absorption models and wind induced ocean emission models. A dataset of clear sky...
Tipo: Text Palavras-chave: Calibration; Geophysical model; Numerical simulation; SSMIS; AMSR-E; Satellite passive microwave.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00190/30101/28628.pdf
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New Possibilities for Geophysical Parameter Retrievals Opened by GCOM-W1 AMSR2 ArchiMer
Zabolotskikh, Elizaveta; Mitnik, Leonid; Reul, Nicolas; Chapron, Bertrand.
A new approach to retrieve sea surface wind speed (SWS) in tropical cyclones (TCs) from the Advanced Microwave Scanning Radiometer 2 (AMSR2) data is presented. Analysis of all six AMSR2 C- and X-band channel measurements over TCs is shown to efficiently help to separate the rain contribution. Corrected measurements at 6.9 and 10.65 GHz are then used to retrieve the SWS. Spatial and temporal collocation of AMSR2 and tropical rain measurement mission (TRMM) microwave instrument (TMI) data is then further used to empirically relate TMI rain rate (RR) product to RR estimates from AMSR2 in hurricanes. SWS estimates are validated with measurements from the stepped frequency microwave radiometer (SFMR). As further tested, more than 100 North Atlantic and North...
Tipo: Text Palavras-chave: Satellite passive microwave; AMSR2; Rain rate; Sea surface wind speed; Hurricanes; Brightness temperature modeling.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00270/38104/36255.pdf
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Polar low climatology over the Nordic and Barents seas based on satellite passive microwave data ArchiMer
Smirnova, Julia E.; Golubkin, Pavel A.; Bobylev, Leonid P.; Zabolotskikh, Elizaveta; Chapron, Bertrand.
A new climatology of polar lows over the Nordic and Barents seas for 14 seasons (1995/1996-2008/2009) is presented. For the first time in climatological studies of polar lows an approach based on satellite passive microwave data was adopted for polar low identification. A total of 637 polar lows were found in 14 extended winter seasons by combining total atmospheric water vapor content and sea surface wind speed fields retrieved from Special Sensor Microwave/Imager data. As derived, the polar low activity in the Norwegian and Barents Seas is found to be almost equal, and the main polar low genesis area is located northeastward of the North Cape. For the Barents Sea, a significant correlation is found between the number of polar lows and mean sea ice...
Tipo: Text Palavras-chave: Polar lows; Nordic and Barents seas; Satellite passive microwave data; SSMI; Total atmospheric water vapor content.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00275/38639/37161.pdf
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Radio-Frequency Interference Identification Over Oceans for C- and X-Band AMSR2 Channels ArchiMer
Zabolotskikh, Elizaveta; Mitnik, Leonid M.; Chapron, Bertrand.
A new method for radio-frequency interference (RFI) contamination identification over open oceans for the two C-subbands and X-band of Advanced Microwave Scanning Radiometer 2 (AMSR2) channel measurements is suggested. The method is based both on the AMSR2 brightness temperature (T-B) modeling and on the analysis of AMSR2 measurements over oceans. The joint analysis of T-B spectral differences allowed to identify the relations between them and the limits of their variability, which are ensured by the changes in the environmental conditions. It was found that the constraints, based on the ratio of spectral differences, are more regionally and seasonally independent than the spectral differences themselves. Although not all possible RFI combinations are...
Tipo: Text Palavras-chave: Atmosphere; Geophysical measurement techniques; Oceans; Passive microwave remote sensing; Radio-frequency interference (RFI).
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38411/41989.pdf
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Validation of the New Algorithm for Rain Rate Retrieval from AMSR2 Data Using TMI Rain Rate Product ArchiMer
Zabolotskikh, Elizaveta; Chapron, Bertrand.
A new algorithm is derived for rain rate (RR) estimation from Advanced Microwave Sounding Radiometer 2 (AMSR2) measurements taken at 6.9, 7.3, and 10.65 GHz. The algorithm is based on the numerical simulation of brightness temperatures (T-B) for AMSR2 lower frequency channels, using a simplified radiation transfer model. Simultaneous meteorological and hydrological observations, supplemented with modeled values of cloud liquid water content and rain rate values, are used for the calculation of an ensemble of AMSR2 T(B)s and RRs. Ice clouds are not taken into account. AMSR2 brightness temperature differences at C- and X-band channels are then used as inputs to train a neural network (NN) function for RR retrieval. Validation is performed against Tropical...
Tipo: Text
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00269/37992/36073.pdf
Registros recuperados: 5
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