太平洋及中国沿海的海平面变化

SEA LEVEL CHANGE IN THE PACIFIC OCEAN AND ALONG THE COAST OF CHINA

本文利用PSMSL（平均海平面服务局）提供的太平洋和中国沿海的海平面资料，分析了太平洋各纬度带以及中国沿海的海平面变化规律。主要结果有：在太平洋的中纬度区（20°S－40°s，20°N40°N），北太平洋的海平面上升速率比南太平洋的快，其中，东北太平洋（20°N－40°N，180°E－80°W）自1960年以来的海平面上升速率已达2．3mm／yr；在赤道区（10°s－10°N），西太平洋的上升速率接近2mm/yr，高于东太平洋的上升速率；在高纬度区（40°S－70°S，40°N－70°N），西北和西南太平洋的海平面都呈现明显的上升趋势，其速率分别为1．5mm／yr和2．5mm／yr，这证实了南极洲冰盖的消融对海平面变化的影响要比格陵兰岛的强烈；对中国沿海十二个验潮站海平面资料的分析表明，自1960年以来，中国沿海海平面正以约2．0mm/yr的速率上升，上海附近的东海海域上升速率近达3．0mm/yr。

The time series of the observational sea level in the Pacific and Chinese sea areas in thiscentury from the tide gauge stations of PSMSl, and China are used to study the sea levelchanges in the various latitude zones of the Pacific and the coastal areas of China. The anal ysed results are the following:In the mid - latitude zones (20°S- 40°S, 20°N-40°N), the rising rate of sea level of thenorthern Pacific is getting higher than that of the Southern, especially, the rate of sea levelin the northern - eastern Pacific (20°S- 40°S, 180°E - 80°W) has reached 2. 3 mm/yr since1 960' s. ln the Equatorial zones (10°S- 10°N), the rising rate of sea level of the western Pa cif ic is closing to 2 mm/yr and larger than that of the eastern equatorial Pacific. In the higher- latitude zones (40°S- 70°S,40°N- 70°N),the sea levels in both the northern - western andsouthern - western Pacific areas are being the obvious risings and their rates in the higher latitude zones are 1. 5 mm/yr and 2. 5 mm/yr, respectively, it is confirmed that the effect ofice - sheet melting in the Antarctica on the sea level change is stronger than that in theGreenland.It is also shown from the sea level data of twelve tide gauge stations located along thecoast of China since 1960 that the mean sea level is apparently rising at a rate of about 3. 0mm/yr for East China Sea area near by Shanghai.