Mapping sea surface velocities in the Changjiang coastal zone with advanced synthetic aperture radar  

作　　者：WANG Lihua ZHOU Yunxuan GE Jianzhong JOHANNESSEN Johnny A. SHEN Fang 

机构地区：[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University [2]Nansen Environmental and Remote Sensing Center [3]Geophysical Institute,University of Bergen

出　　处：《Acta Oceanologica Sinica》2014年第11期141-149,共9页海洋学报（英文版）

基　　金：The National Basic Research Program(973 Program)of China under contract No.2010CB951204;European Space Agency-Ministry of Science and Technology of the People’s Republic of China Dragon 3 Cooperation Programme under contract No.10593;the State Key Laboratory of Estuarine and Coastal Research,East China Normal University of China under contract No.SKLEC-2012KYYW02;the 111 Project under contract No.B08022

摘　　要：Range Doppler velocities derived from the Envisat advanced synthetic aperture radar（ASAR） wide swath images are analyzed and assessed against the numerically simulated surface current fields derived from the finite volume coastal ocean model（FVCOM） for the Changjiang Estuary. Comparisons with the FVCOM simulations show that the European Space Agency（ESA） Envisat ASAR based Doppler shift anomaly retrievals have the capability to capture quantitative information of the surface currents in the Changjiang Estuary. The uncertainty analysis of the ASAR range Doppler velocity estimates are discussed with regard to the azimuthal and range bias corrections, radar incidence angles, inaccuracy in the wind field corrections and the presence of rain cells.The corrected range Doppler velocities for the Changjiang Estuary area are highly valuable as they exhibit quantitative expressions related to the multiscale upper layer dynamics and surface current variability around the East China Sea, including the Changjiang Estuary.Range Doppler velocities derived from the Envisat advanced synthetic aperture radar（ASAR） wide swath images are analyzed and assessed against the numerically simulated surface current fields derived from the finite volume coastal ocean model（FVCOM） for the Changjiang Estuary. Comparisons with the FVCOM simulations show that the European Space Agency（ESA） Envisat ASAR based Doppler shift anomaly retrievals have the capability to capture quantitative information of the surface currents in the Changjiang Estuary. The uncertainty analysis of the ASAR range Doppler velocity estimates are discussed with regard to the azimuthal and range bias corrections, radar incidence angles, inaccuracy in the wind field corrections and the presence of rain cells.The corrected range Doppler velocities for the Changjiang Estuary area are highly valuable as they exhibit quantitative expressions related to the multiscale upper layer dynamics and surface current variability around the East China Sea, including the Changjiang Estuary.

关 键 词：advanced synthetic aperture radar Changjiang coast Doppler centroid anomaly range Doppler velocity finite volume coastal ocean model 

分 类 号：P714[天文地球—海洋科学]