基于两种数据集的全球SST变化趋势的对比研究

分别利用了来自NOAA和Hadley中心的SST(Sea Surface Temperature)资料,分析了全球海域每个网格点上SST的变化趋势,并将两种资料分析的结果进行比较。研究发现:近150a期间,全球大部分海域的SST以0.003℃.a-1左右的速度显著性逐年线性递增,仅在格陵兰南部海域和两极部分海域呈显著的逐年线性递减趋势;NOAA的SST变化趋势的区域性差异比Hadley的SST明显,但后者变化趋势的强度稍大于前者;不同海域SST的逐年变化趋势由不同的季节主导;在1910年为近150a来SST的最低点,之后缓慢上升,在1942年附近达到1个相对高点,而后略有下降,但很快又恢复上升趋势,上升趋势一直延续至今。

A Comparison Study on the Global Change Trend of SST Analyzed Based on Two Data Sets

The changing trend of SST(Sea Surface Temperature) at individual grids of world oceans has been analyzed based on the SST data from NOAA and on those from the Hadley Center,and the results from these two data sets are compared.It has been found that during the last 150 years the SST in most of the oceans tends to increase evidently and linearly year by year at a rate of about 0.003℃·a-1,with a trend of decreasing evidently and linearly year by year in the southern sea area of Greenland and part sea areas of Arctic and Antarctica.The changing trend of SST based on the data set from NOAA has more clear regional differences than that based on the data set from Hadley,but the latter is stronger in its intensity than the former.The year-by-year changing tendency of SST in different sea areas is mainly governed by seasons.The lowest SST in the last 150 years occurred in 1910.Afterwards,the SST went up slowly and reached to a relatively high point around 1942.Then,after a slightly going down,it returned quickly to go up again.At the present the SST is still in a going-up trend.