Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements
2019 Living Planet Symposium, 13-17 May 2019, Milan, Italy
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2019-05
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dig-icm-es-10261-2049932020-03-24T12:12:53Z Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements Lin, Wenming Quilfen, Yves Portabella, Marcos Stoffelen, Ad Li, Zhen 2019 Living Planet Symposium, 13-17 May 2019, Milan, Italy The Chinese French Ocean Satellite (CFOSAT) is an innovative space mission dedicated to the observation and monitoring of the ocean sea state and the sea surface vector winds. Recently launched on 29 October 2018, CFOSAT operates two Ku-band rotating radars: the near-nadir Ku-band wave scatterometer (SWIM) and the dual-polarization, moderate incidence angle, Ku-band wind scatterometer (SCAT). Such instrumental configuration provides regular measurements of sea state parameters, including directional wave spectrum, together with simultaneous wind speed and direction. This unique configuration of two sensors operating at two different incidence angle ranges also gives the opportunity to improve the quality of the retrieved parameters by combining both data sources. In particular, this approach can be applied for the improvement of SCAT wind vector retrievals using SWIM nadir observations. Similarly to other rotating scatterometers, the SCAT measurements have a poor azimuthal diversity of the backscatter (σ° ) measurements in the central (nadir) part of the swath, leading to larger and systematic wind errors in this swath region. At the same time, the SWIM altimeter provides high-quality near-nadir σ° observations (and derived wind speed estimates), which will be used to further constrain the SCAT wind inversion. In the present study, we show the results obtained from an improved wind retrieval algorithm which is based on the inversion of collocated SWIM and SCAT observations. The simulation of SCAT and SWIM backscatter measurements is performed with the end-to-end simulators developed in the framework of the CFOSAT mission preparation. To ensure correct data synchronization, every instrument simulation is performed for identical orbit parameters and the same model wind field. The standard scatterometer wind vector inversion procedure based on the Maximum Likelihood Estimator (MLE) is extended to accommodate the SWIM collocated measurements. The NSCAT-4 Geophysical Model Function (GMF) is used for SCAT, while the wind-speed only GMF for near-nadir angles developed by Abdalla (2012) and Gourrion et al. (2002) is used for SWIM. Moreover, the 2D-Var ambiguity removal (AR) is also used in the simulation. A preliminary comparative analysis between the combined SCAT and SWIM inversion and the SCAT-only inversion shows that the wind vector errors are significantly lower in the former. The results from a more comprehensive simulation, which includes more realistic backscatter errors and a full wind retrieval process (including AR), will be presented at the time of the conference. Moreover, although CFOSAT is currently in the commissioning phase, a preliminary comparison of both inversion schemes will be tested with real data if the latter become available before the conference 2020-03-24T12:10:52Z 2020-03-24T12:10:52Z 2019-05 2020-03-24T12:10:52Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 2019 Living Planet Symposium (2019) http://hdl.handle.net/10261/204993 Sí none European Space Agency |
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2019 Living Planet Symposium, 13-17 May 2019, Milan, Italy |
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comunicación de congreso |
| author |
Lin, Wenming Quilfen, Yves Portabella, Marcos Stoffelen, Ad Li, Zhen |
| spellingShingle |
Lin, Wenming Quilfen, Yves Portabella, Marcos Stoffelen, Ad Li, Zhen Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| author_facet |
Lin, Wenming Quilfen, Yves Portabella, Marcos Stoffelen, Ad Li, Zhen |
| author_sort |
Lin, Wenming |
| title |
Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| title_short |
Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| title_full |
Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| title_fullStr |
Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| title_full_unstemmed |
Improved CFOSAT Scatterometer Wind Vector Retrievals With the Use of Collocated Nadir SWIM Measurements |
| title_sort |
improved cfosat scatterometer wind vector retrievals with the use of collocated nadir swim measurements |
| publisher |
European Space Agency |
| publishDate |
2019-05 |
| url |
http://hdl.handle.net/10261/204993 |
| work_keys_str_mv |
AT linwenming improvedcfosatscatterometerwindvectorretrievalswiththeuseofcollocatednadirswimmeasurements AT quilfenyves improvedcfosatscatterometerwindvectorretrievalswiththeuseofcollocatednadirswimmeasurements AT portabellamarcos improvedcfosatscatterometerwindvectorretrievalswiththeuseofcollocatednadirswimmeasurements AT stoffelenad improvedcfosatscatterometerwindvectorretrievalswiththeuseofcollocatednadirswimmeasurements AT lizhen improvedcfosatscatterometerwindvectorretrievalswiththeuseofcollocatednadirswimmeasurements |
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1777667154333663232 |