中法海洋卫星散射计海冰后向散射系数时空变化特征研究
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1.南京信息工程大学海洋科学学院;2.自然资源部空间海洋遥感与应用重点实验室

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基金项目:

国家重点研发计划(2022YFC3104900 2022YFC3104902)


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Spatial and Temporal Characteristics of CFOSAT Scatterometer Backscatters over the Sea Ice
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Affiliation:

1.School of Marine Sciences, Nanjing University of Information Science and Technology;2.School of Marine Sciences,Nanjing University of Information Science and Technology,Nanjing;3.Key Laboratory of Space Ocean Remote Sensing and Application (MNR)

Fund Project:

The National Key Technologies R&D Program of China

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    摘要:

    以往基于微波散射计的海冰遥感研究主要是进行海冰和海水的区分,进而探究海冰的覆盖范围。中法海洋卫星(CFOSAT)散射计(CSCAT)利用旋转扫描的扇形波束对地面进行观测,其多入射角和多方位角的观测几何特点为海冰监测提供了新机遇。本文首先将CSCAT后向散射系数数据与欧洲气象卫星组织的海冰密集度数据进行匹配,然后分析南北两极不同海冰密集度下CSCAT后向散射系数的季节性变化,厘清CSCAT海冰后向散射系数的时空分布特征,并构建海冰后向散射地球物理模式函数(GMF)。结果表明,CSCAT后向散射系数随海冰密集度的增加而增强。海冰密集度较低时,CSCAT在南北两极的后向散射系数具有良好的一致性,但存在明显的风速调制效应,且该效应随着海冰密集度的增加逐渐减弱。总之,CSCAT后向散射系数与观测几何、海面风速、海冰密集度等因素息息相关,研究结果为利用CSCAT进行海冰密集度遥感提供了参考。

    Abstract:

    Previous studies on the sea ice detection based on microwave scatterometers mainly focused on distinguishing sea ice from water, and in turn, exploring the coverage of sea ice. The scatterometer onboard the China-France Oceanography Satellite (CFOSAT), namely CSCAT, uses rotating fan beams to observe Earth surface, such that its multi-incidence and multi-azimuth observation geometry provides new opportunities for sea ice monitoring. In this study, the CSCAT backscatter data are firstly collocated with the sea ice concentration data from the European Organization for Meteorological Satellites (EUMETSAT), and then the seasonal variations of CSCAT backscatter coefficients under different sea ice concentrations are analyzed for both poles. Consequently, the spatiotemporal characteristics of CSCAT backscatter coefficients over the sea ice are derived, and a sea ice geophysical model function (GMF) is developed. The results show that the CSCAT backscatter coefficient increases with sea ice concentration (SIC). Under low SIC conditions, the CSCAT backscatter coefficients show good consistency over south and north Polar Regions, but there is an obvious modulation by wind speed, whose effect decreases as the SIC increases. Overall, the CSCAT backscatter coefficient is closely related to the observation geometry, the sea surface wind speed, the sea ice concentration, and etc. The results provide relevant hints for the SIC retrieval of CSCAT.

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  • 收稿日期:2024-01-09
  • 最后修改日期:2024-03-24
  • 录用日期:2024-05-29
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