| 利用2012年中国北极考察现场观测数据和卫星遥感资料评估海洋2号卫星扫描辐射计数据反演北极海冰密集度的研究 |
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| 作者姓名： | SHI Lijiang LU Peng CHENG Bin KARVONEN Juh WANG Qimao LI Zhijun HAN Hongwei |
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| 作者单位： | National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China,Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China,Finnish Meteorological Institute, Helsinki FI-00101, Finland,Finnish Meteorological Institute, Helsinki FI-00101, Finland,National Satellite Ocean Application Service, State Oceanic Administration, Beijing 100081, China,Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China,Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China |
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| 基金项目： | The International Science and Technology Cooperation Project of China under contract No.2011DFA22260;the National Natural Science Foundation of China under contract No.41276191;the Public Science and Technology Research Funds Projects of Ocean by the State Oceanic Administration under contract No.201205007-05;the Chinese Polar Environment Comprehensive Investigation & Assessment Program by the State Oceanic Administration under contract Nos 2013-02-04 and 2012-04-03-02 |
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| 摘 要： | A retrieval algorithm of arctic sea ice concentration(SIC) based on the brightness temperature data of "HY-2" scanning microwave radiometer has been constructed. The tie points of the brightness temperature were selected based on the statistical analysis of a polarization gradient ratio and a spectral gradient ratio over open water(OW), first-year ice(FYI), and multiyear ice(MYI) in arctic. The thresholds from two weather filters were used to reduce atmospheric effects over the open ocean. SIC retrievals from the "HY-2" radiometer data for idealized OW, FYI, and MYI agreed well with theoretical values. The 2012 annual SIC was calculated and compared with two reference operational products from the National Snow and Ice Data Center(NSIDC) and the University of Bremen. The total ice-covered area yielded by the "HY-2" SIC was consistent with the results from the reference products. The assessment of SIC with the aerial photography from the fifth Chinese national arctic research expedition(CHINARE) and six synthetic aperture radar(SAR) images from the National Ice Service was carried out. The "HY-2" SIC product was 16% higher than the values derived from the aerial photography in the central arctic. The root-mean-square(RMS) values of SIC between "HY-2" and SAR were comparable with those between the reference products and SAR, varying from 8.57% to 12.34%. The "HY-2" SIC is a promising product that can be used for operational services.
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| 关 键 词： | "HY-2" scanning microwave radiometer retrieval algorithm sea ice concentration arctic |
| 收稿时间： | 2014/5/15 0:00:00 |
| 修稿时间： | 2014/10/20 0:00:00 |
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