MODIS海冰数据监测中山站附近海冰的季节性变化

本文利用中分辨率成像光谱仪(Moderate Resolution Imaging Spectroradiometer,即MODIS)的海冰数据,监测中山站附近区域海冰的季节性(尤其是夏季)的消融与冻结情况及海冰表面温度的变化。文中先对MODIS的海冰数据进行影像分层、数据合成,分时间段计算海冰范围,然后提取海冰表面温度信息,最后对获取的数据进行分析。研究结果表明,中山站附近区域在每年10月至翌年2月中上旬为海冰消融期;2月中下旬至4月为海冰冻结非密封期;5月至9月为海冰冻结密封期。海冰范围2月份最小;海冰表面温度1月份最低,8月份最高。

USING THE SEA ICE DATA OF MODIS TO INSPECT THE SEASONAL VARIETY OF THE SURROUNDING SEA ICE OF ZHONGSHAN STATION

Using the sea ice data of MODIS covering the period 2000—2002 obtained from the NSIDC,this paper investigated the surrounding sea ice of Zhongshan Station to inspect the seasonal melting and freezing,and the variety of the ice surface temperature.The method of this study is:first,delaminate the sea ice data of the MODIS to two parts,one is the sea ice distributing,and the other is the sea ice temperature;then synthesize the data of sea ice distributing;and,count the sea ice extent on real time;at last,distill the surface temperature of the sea ice.The results indicate:the sea ice surrounding Zhongshan Station melts from October to February in the next year,and from then to April is the time of freezing without airproof,and from May to September is the time of airproof freezing,when the sea ice bestrews the sea area surrounding the Zhongshan Station.The minimum of sea ice in this district appears in February,and the highest and lowest temperatures of the ice surface appear in January and August respectively.These results are partly validated by the former study of Antarctic sea ice,and receive some more accurate data near Zhongshan Station.Besides,this paper validated the feasibility of using the sea ice data of MODIS to inspect the variety of Antarctic sea ice.