基于ERA5数据集的黄渤海海平面变化特征研究

Study on the characteristics of sea level change in the Bohai and Yellow Seas based on ERA5 dataset

本文利用ERA5近19年(2000—2018年)的黄渤海海平面数据,采用五点滑动平均法消除原始数据的噪声影响,开展了黄渤海区域海平面年际及季节变化特征研究,结果表明:2000-2018年间,除个别年份外,黄渤海海平面整体呈现上升趋势,平均每年上升约为3.1mm;渤海的海平面的上升幅度要大于黄海的海平面上升幅度;北渤海的上升幅度大于南渤海的上升幅度,北黄海的上升幅度大于南黄海的上升幅度;渤海南北两侧海平面高度差异性不大,黄海地区差异性明显;北黄海区域略低于南黄海,且近岸区域大于远海区域;黄渤海海平面变化具有季节性和地域性,夏秋季节海平面平均高度高于春秋季节,不同季节海平面高度变化呈现出不同的分布状态,因此在实际海洋活动中,需要区域、年份和季节综合考虑海平面变化对海洋工程的影响。

This paper adopts nearly 19years(2000-2018)sea level data of ERA5in the Bohai and Yellow Sea to carry out the inter-annual and seasonal variation characteristics,and five points moving average method is adopted to eliminate the noise of the original data.It could be concluded that from 2000to 2018,except for some years,the sea level in the Bohai and Yellow Sea showed a rising trend,and the average annual rise is about 3.1mm.The sea level rise in the Bohai Sea is larger than that in the Yellow Sea.The rising range in the north of Bohai Sea is greater than that in the south of Bohai Sea,and it is the same in the Yellow Sea.There is little difference for sea level height between the north and the south of the Bohai Sea,but there is significant difference in the Yellow Sea.The sea level in the north Yellow Sea area is slightly lower than that in the south area,and the sea level in the nearshore area is larger than that in the offshore area.Sea level changes in theYellow Sea and Bohai Sea are seasonal and regional.The average sea level in summer and autumn is higher than that in spring and autumn.Sea level changes in different seasons show different distribution states.Therefore,in the actual ocean activities,the influence of sea level change on ocean engineering needs to be considered comprehensively.