CAJ | 학술논문

HY-2是中国自主研发的海洋卫星。本文研究了利用HY-2卫星微波扫描辐射计亮温数据反演北极海冰密集度的方法。参考NASA TEAM方法，我们对典型海区光谱梯度率和极化梯度率进行了统计分析，确定了计算海冰密集度所需的亮温特征值；利用天气滤波器有效去除了开阔海域由于大气中水蒸气、云中液态水、降雨等现象引起的海冰密集度计算错误。本文计算了2012年全年的北极海冰密集度产品，并对产品精度进行了初步验证，验证结果表明：三个海冰类型已知区域的海冰密集度结果与理想值比较接近，多年冰密集度的反演精度需要进一步提高。本文结果与美国冰雪数据中心和德国不来梅大学提供的两种业务化海冰密集度产品一致。本研究为利用HY-2卫星监测极区海冰密集度变化，发布实时产品奠定了基础。
HY-2시중국자주연발적해양위성。본문연구료이용HY-2위성미파소묘복사계량온수거반연북겁해빙밀집도적방법。삼고NASA TEAM방법，아문대전형해구광보제도솔화겁화제도솔진행료통계분석，학정료계산해빙밀집도소수적량온특정치；이용천기려파기유효거제료개활해역유우대기중수증기、운중액태수、강우등현상인기적해빙밀집도계산착오。본문계산료2012년전년적북겁해빙밀집도산품，병대산품정도진행료초보험증，험증결과표명：삼개해빙류형이지구역적해빙밀집도결과여이상치비교접근，다년빙밀집도적반연정도수요진일보제고。본문결과여미국빙설수거중심화덕국불래매대학제공적량충업무화해빙밀집도산품일치。본연구위이용HY-2위성감측겁구해빙밀집도변화，발포실시산품전정료기출。
The Chinese marine satellite (HY-2)was successfully launched on 1 6 August 201 1 .We investigated an algo-rithm for sea ice concentration retrieval,based on brightness temperature data from the HY-2 scanning radiometer. In this study,the tie-points for brightness temperatures were selected based on statistical analysis of the polarization gradient ratio and the spectral gradient ratio over typical areas.The thresholds of two weather filters were deter-mined to reduce the atmospheric effect over the open ocean.The total ice concentration over the Arctic in 201 2 was calculated and compared with two existing operational data sets from the National Snow and Ice Data Center (NSIDC)and the University of Bremen.The result of the comparison showed that the calculated sea ice concentra-tion from the HY-2 radiometer data were comparable with ideal values from three typical ice regions in the Arctic O-cean.Our results were also in good agreement with two operational products.Our study demonstrated that HY-2 scanning radiometer data and our retrieval algorithm adapted from the NASA algorithm could be used for operational sea ice services in the Arctic Ocean.