南极海冰的长期变化趋势

本文使用了ＷＤＣ－Ａ提供的按ＷＭＯ标准格式化的ＳＧＲＩＤ海冰资料和ＮＳＩＤＣ提供的ＳＭＭＲ和ＳＭＭ／１的亮温微波资料，将这些资料同化处理使海温序列延长为１９７３－１９９４年。利用上述资料研究海冰的长期变化趋势，发现７０年代前期海冰迅速增多到中期达最大值，后期到８０年代前期迅速减少到最少，８０年代海冰持续偏少或在平均值附近振动，９０年代前期海冰又开始缓慢增多。

LONG-RANGE VARIATION TREND OF THE ANTARCTIC SEA ICE

n this paper, the antarctic sea ice SIGRID data in 1973-1989 standardized by WMOformat provided by WDC-A and the SMMR and SMM/1 brightness microwave data in 1978 1994 provided by NSIDC are used. TIses data are simulated-processed to enlong year numberof the sea ice data as in 1973-1994.Using these data to study the long-range variation trend of sea ice, it is fotmd that, theAntarctic sea ice increased from early 1970s' and attained the maximum value in coddle1970s'. Since later 1970s', sea ice rapidly decreased to the minimum in early 198()s'. It wassuatainedly less or varied about the mean value in whole the 1980s'. In early 1990s', sea icebegan to increase again slowly, but the total value was still leSS than in early-middle 1970s'.In addition, the regional difference of sea ice variation is very 18lge. It is specially true forsea ice of the Wedded Sea region with its variation transition time prior to all other sea regions.Sea ice variation of the Wedded Sea Plays a leading role on and give a peitive-negative fedbackto other sea ice regions.