Calibration efforts for MWR on-board SAC-D/Aquarius mission

The Microwave Radiometer (MWR) on board the SACD/Aquarius mission, launched on June 2011, is a Dicke radiometer operating at 23.8 GHz (H-Pol) and 36.5 GHz (H/V/45-Pol). MWR channels are useful to provide ancillary data for the various retrievals to be performed with Aquarius regarding ocean and land...

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Autores principales: Bruscantini, C.A., Maas, M., Grings, F., Karszenbaum, H.
Formato: CONF
Materias:
colocation
cross calibration
MWR
Windsat
Microwave devices
Microwaves
Radiometers
Remote sensing
Brightness temperatures
Colocations
Cross calibration
Homogeneous targets
Microwave radiometers
Temporal stability
WindSat
Calibration
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_97814799_v_n_p181_Bruscantini
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_97814799_v_n_p181_Bruscantini
record_format dspace
spelling todo:paper_97814799_v_n_p181_Bruscantini2023-10-03T16:43:37Z Calibration efforts for MWR on-board SAC-D/Aquarius mission Bruscantini, C.A. Maas, M. Grings, F. Karszenbaum, H. colocation cross calibration MWR Windsat Microwave devices Microwaves Radiometers Remote sensing Brightness temperatures Colocations Cross calibration Homogeneous targets Microwave radiometers MWR Temporal stability WindSat Calibration The Microwave Radiometer (MWR) on board the SACD/Aquarius mission, launched on June 2011, is a Dicke radiometer operating at 23.8 GHz (H-Pol) and 36.5 GHz (H/V/45-Pol). MWR channels are useful to provide ancillary data for the various retrievals to be performed with Aquarius regarding ocean and land applications. In this study we report the calibration results obtained by a land cross-calibration between Windsat and MWR. Results were generated for the 2011-2012 period and using the version V5.0S of the MWR data. Radiometer inter-comparison over selected homogeneous targets is widely used for calibration assessment and data quality evaluation. The methodology lays on the temporal stability of the selected targets and their homogeneity in terms of brightness temperature (Tb), so that radiometers with similar characteristics (frequency, polarization, incidence angle) should observe the same Tb when passing over the target within a short temporal window. Differences on observed Tbs are associated to a poor calibration of the instrument under study. The cross-calibration is an adjustment of the Tb data of the radiometer under study to match the Tb data of the already calibrated radiometer. In this study, linear adjustments are applied for each MWR beams of its three channels to match Windsat observations. In order to examine the entire dynamic range of land observations, 19 homogeneous targets were selected for cross-calibration. These targets have been previously selected for quality assessment of AMSR-E data [1]. Targets include tropical and boreal forests, desert, grassland and Sahel. Overall, it was found that the instrument compares favorably toWindsat over land targets. Nevertheless, certain issues to be resolved are identified and corrections are proposed. © 2014 IEEE. CONF info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_97814799_v_n_p181_Bruscantini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic colocation
cross calibration
MWR
Windsat
Microwave devices
Microwaves
Radiometers
Remote sensing
Brightness temperatures
Colocations
Cross calibration
Homogeneous targets
Microwave radiometers
MWR
Temporal stability
WindSat
Calibration
spellingShingle colocation
cross calibration
MWR
Windsat
Microwave devices
Microwaves
Radiometers
Remote sensing
Brightness temperatures
Colocations
Cross calibration
Homogeneous targets
Microwave radiometers
MWR
Temporal stability
WindSat
Calibration
Bruscantini, C.A.
Maas, M.
Grings, F.
Karszenbaum, H.
Calibration efforts for MWR on-board SAC-D/Aquarius mission
topic_facet colocation
cross calibration
MWR
Windsat
Microwave devices
Microwaves
Radiometers
Remote sensing
Brightness temperatures
Colocations
Cross calibration
Homogeneous targets
Microwave radiometers
MWR
Temporal stability
WindSat
Calibration
description The Microwave Radiometer (MWR) on board the SACD/Aquarius mission, launched on June 2011, is a Dicke radiometer operating at 23.8 GHz (H-Pol) and 36.5 GHz (H/V/45-Pol). MWR channels are useful to provide ancillary data for the various retrievals to be performed with Aquarius regarding ocean and land applications. In this study we report the calibration results obtained by a land cross-calibration between Windsat and MWR. Results were generated for the 2011-2012 period and using the version V5.0S of the MWR data. Radiometer inter-comparison over selected homogeneous targets is widely used for calibration assessment and data quality evaluation. The methodology lays on the temporal stability of the selected targets and their homogeneity in terms of brightness temperature (Tb), so that radiometers with similar characteristics (frequency, polarization, incidence angle) should observe the same Tb when passing over the target within a short temporal window. Differences on observed Tbs are associated to a poor calibration of the instrument under study. The cross-calibration is an adjustment of the Tb data of the radiometer under study to match the Tb data of the already calibrated radiometer. In this study, linear adjustments are applied for each MWR beams of its three channels to match Windsat observations. In order to examine the entire dynamic range of land observations, 19 homogeneous targets were selected for cross-calibration. These targets have been previously selected for quality assessment of AMSR-E data [1]. Targets include tropical and boreal forests, desert, grassland and Sahel. Overall, it was found that the instrument compares favorably toWindsat over land targets. Nevertheless, certain issues to be resolved are identified and corrections are proposed. © 2014 IEEE.
format CONF
author Bruscantini, C.A.
Maas, M.
Grings, F.
Karszenbaum, H.
author_facet Bruscantini, C.A.
Maas, M.
Grings, F.
Karszenbaum, H.
author_sort Bruscantini, C.A.
title Calibration efforts for MWR on-board SAC-D/Aquarius mission
title_short Calibration efforts for MWR on-board SAC-D/Aquarius mission
title_full Calibration efforts for MWR on-board SAC-D/Aquarius mission
title_fullStr Calibration efforts for MWR on-board SAC-D/Aquarius mission
title_full_unstemmed Calibration efforts for MWR on-board SAC-D/Aquarius mission
title_sort calibration efforts for mwr on-board sac-d/aquarius mission
url http://hdl.handle.net/20.500.12110/paper_97814799_v_n_p181_Bruscantini
work_keys_str_mv AT bruscantinica calibrationeffortsformwronboardsacdaquariusmission
AT maasm calibrationeffortsformwronboardsacdaquariusmission
AT gringsf calibrationeffortsformwronboardsacdaquariusmission
AT karszenbaumh calibrationeffortsformwronboardsacdaquariusmission
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