ASCAT-B ocean calibration and wind product
2012 EUMETSAT Meteorological Satellite Conference. Session 6 - Satellite-Based Observations of the oceans, including by SENTINEL-3. 3-7 September 2012, Sopot, Poland.-- 8 pages, 6 figures
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dig-icm-es-10261-934452022-01-31T15:50:29Z ASCAT-B ocean calibration and wind product Verspeek, Jeroen Stoffelen, Ad Verhoef, Anton Portabella, Marcos Vogelzang, J. 2012 EUMETSAT Meteorological Satellite Conference. Session 6 - Satellite-Based Observations of the oceans, including by SENTINEL-3. 3-7 September 2012, Sopot, Poland.-- 8 pages, 6 figures The Metop-B satellite with onboard the Advanced Scatterometer (ASCAT) has been successfully launched on September 17, 2012. The ASCAT instrument is a C-band vertically-polarized fan antennae beam system. ASCAT-B onboard Metop-B is identical to the already operational scatterometer ASCAT-A onboard Metop-A which was launched in 2006. Within the framework of the Ocean & Sea Ice (OSI) Satellite Application Facility (SAF), KNMI has developed an ocean calibration method, based on Numerical Weather Prediction (NWP) wind inputs, the so-called NWP Ocean Calibration (NOC). The NOC method resides in direct comparison of measured backscatter data with simulated backscatter data from NWP winds using a forward model or Geophysical Model Function (GMF). For ASCAT, the CMOD5.n GMF is used, which is compliant with the GMF of its predecessor, the European Remote-sensing Satellite (ERS) scatterometer. The radar backscatter triplets can be visualized in a 3-dimensional measurement space. For a given Wind Vector Cell (WVC), i.e., position across the swath, the measured triplets are distributed around the GMF, which constitutes a well-defined conical surface that depends on wind speed and wind direction only. Systematic displacements of the cloud of triplets in any direction of the 3D space are mainly due to absolute beam biases, which are adequately removed by the results of the NOC. The NOC corrections are furthermore split into a smooth incidence angle dependent part, which is to be included in the GMF, and a remaining antenna-dependent part (NOCa). The averaged NOC residuals over a longer period are used to calculate correction factors that are shown to improve the wind retrieval Peer Reviewed 2014-03-12T07:45:34Z 2014-03-12T07:45:34Z 2012-09-06 2014-03-12T07:45:35Z comunicación de congreso http://purl.org/coar/resource_type/c_5794 2012 EUMETSAT Meteorological Satellite Conference (2012) http://hdl.handle.net/10261/93445 open |
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2012 EUMETSAT Meteorological Satellite Conference. Session 6 - Satellite-Based Observations of the oceans, including by SENTINEL-3. 3-7 September 2012, Sopot, Poland.-- 8 pages, 6 figures |
format |
comunicación de congreso |
author |
Verspeek, Jeroen Stoffelen, Ad Verhoef, Anton Portabella, Marcos Vogelzang, J. |
spellingShingle |
Verspeek, Jeroen Stoffelen, Ad Verhoef, Anton Portabella, Marcos Vogelzang, J. ASCAT-B ocean calibration and wind product |
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Verspeek, Jeroen Stoffelen, Ad Verhoef, Anton Portabella, Marcos Vogelzang, J. |
author_sort |
Verspeek, Jeroen |
title |
ASCAT-B ocean calibration and wind product |
title_short |
ASCAT-B ocean calibration and wind product |
title_full |
ASCAT-B ocean calibration and wind product |
title_fullStr |
ASCAT-B ocean calibration and wind product |
title_full_unstemmed |
ASCAT-B ocean calibration and wind product |
title_sort |
ascat-b ocean calibration and wind product |
publishDate |
2012-09-06 |
url |
http://hdl.handle.net/10261/93445 |
work_keys_str_mv |
AT verspeekjeroen ascatboceancalibrationandwindproduct AT stoffelenad ascatboceancalibrationandwindproduct AT verhoefanton ascatboceancalibrationandwindproduct AT portabellamarcos ascatboceancalibrationandwindproduct AT vogelzangj ascatboceancalibrationandwindproduct |
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