近百余年来北大西洋海表温度的季节特征及变化趋势

Seasonal Characteristic and Long-term Trend of the SST in the North Atlantic Ocean

利用来自英国Hadley气候预测和研究中心的HadlSST海温资料,对北大西洋海域的SST（Sea Surface Temperature）季节特征及整体变化趋势进行研究.研究表明,该海域的SST在8和10月相对较高,2和5月相对偏低,8和10月的SST比2和5月高出5℃左右;SST由低纬向高纬递减,在北极达到最低,等值线呈东西带状分布;在中低纬海域,同一纬度的SST大洋西岸高于大洋东岸,在高纬度海域,同一纬度的SST则是大洋东岸高于大洋西岸;1870 ～ 2009年期间,北大西洋海域逐年、逐夏季、透冬季的SST均呈显著性线性递增,递增趋势分别为0.003 4、0.0048、0.002 7℃/a,逐夏季的递增趋势明显强于逐冬季的递增趋势;北大西洋海域的SST逐年、逐夏季、逐冬季均存在共同的2.09 ～2.25、2.73 ～3.00、3.46 ～3.75年的显著性变化周期以及45年以上的长周期震荡.

The seasonal characteristic and long term trend of SST （Sea Surface Temperature） in the North Atlantic Ocean was analyzed by using the SST data from Hadley and HadISST.The results showed that the SST in August and October is higher（about 5 ℃） than that in February and May.The SST gradually decreased from low latitudes to high latitudes,in the Arctic reached the minimum ; Waters in low latitudes,the same latitude SST ocean west bank is higher t.han the ocean east coast,in the high-latitude waters,the same latitude SST is the east coast of the ocean above the ocean the West Bank.Annual,summer,winter SST in the North Atlantic Ocean has obviously increasing trend from 1870 to 2009,of about 0.003 4,0.004 8,0.002 7 ℃/a.SST in the North Atlantic Ocean has obviously periods of 2.09-2.25,2.73-3.00,3.46-3.75 years and long periodic oscillation larger than 45 years.