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Sea ice extent retrieval with HY-2A scatterometer data and its assessment

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Abstract

A sea ice extent retrieval algorithm over the polar area based on scatterometer data of HY-2A satellite has been established. Four parameters are used for distinguishing between sea ice and ocean with Fisher's linear discriminant analysis method. The method is used to generate polar sea ice extent maps of the Arctic and Antarctic regions of the full 2013–2014 from the scatterometer aboard HY-2A (HY-2A-SCAT) backscatter data. The time series of the ice mapped imagery shows ice edge evolution and indicates a similar seasonal change trend with total ice area from DMSP-F17 Special Sensor Microwave Imager/Sounder (SSMIS) sea ice concentration data. For both hemispheres, the HY-2A-SCAT extent correlates very well with SSMIS 15% extent for the whole year period. Compared with Synthetic Aperture Radar (SAR) imagery, the HY-2A-SCAT ice extent shows good correlation with the Sentinel-1 SAR ice edge. Over some ice edge area, the difference is very evident because sea ice edges can be very dynamic and move several kilometers in a single day.

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Acknowledgements

The authors thank the NSIDC for supplying the SIC data and the Polar View for supplying the SAR images.

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Authors and Affiliations

  1. National Satellite Ocean Application Service, Beijing, 100081, China

    Lijian Shi, Juhong Zou & Tao Zeng

  2. Key Laboratory of Space Ocean Remote Sensing and Application, Beijing, 100081, China

    Lijian Shi, Juhong Zou & Tao Zeng

  3. College of Information Science and Engineering, Ocean University of China, Qingdao, 266100, China

    Mingming Li, Chaofang Zhao, Zhixiong Wang & Yingni Shi

  4. Unit 61741 of PLA, Beijing, 100094, China

    Yingni Shi

  5. Laboratory for Regional Oceanography and Numerical Modeling, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266100, China

    Chaofang Zhao

Authors
  1. Lijian Shi
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  2. Mingming Li
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  3. Chaofang Zhao
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  4. Zhixiong Wang
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  5. Yingni Shi
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  6. Juhong Zou
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  7. Tao Zeng
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Corresponding author

Correspondence to Lijian Shi.

Additional information

Foundation item: The National Key Research and Development Program of China under contract Nos 2016YFC1402704 and 2016YFC1401007; the Open Research Fund of Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences under contract No. 2014LDE009; the International Science and Technology Cooperation Project of China under contract No. 2011DFA22260; the National Natural Science Foundation of China under contract Nos U1606405 and 41276181; the Chinese Polar Environment Comprehensive Investigation & Assessment Program by the State Oceanic Administration under contract Nos 2015-02-04 and 2015-04-03-02.

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Shi, L., Li, M., Zhao, C. et al. Sea ice extent retrieval with HY-2A scatterometer data and its assessment. Acta Oceanol. Sin. 36, 76–83 (2017). https://doi.org/10.1007/s13131-017-1022-2

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  • DOI: https://doi.org/10.1007/s13131-017-1022-2

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