近60年来渤海海域波候变化及其与东亚环流的联系

发布时间：2018-12-26 08:07

【摘要】：研究海洋的波候变化是了解海洋动力过程对气候变迁响应的关键。渤海所处特殊的地理位置,使其波候在长期风场变化影响下存在阶段性变化特征。文章采用1950~2011年NCEP再分析资料中的渤海海域10 m风场资料,利用SWAN模式模拟逐月渤海波浪的有效波高、波向、波周期,分析该海区波候的变化特征。分析结果显示:1950~2011年期间渤海海域的有效波高呈现下降的趋势;波向角度均呈现上升的趋势,波周期相对平稳,略有上升;有效波高平均下降0.3 cm/a,波向角度平均增加0.12°/a。有效波高在1968年前后显现突变点,波向角度约在1960年突变,波周期在1965年左右出现突变点。渤海波候变化与海气振荡密切相关,是大尺度的大气环流变异导致的结果,长期气候变化背景下,东亚环流天气系统的长期变化(包括东亚季风强度、夏季风北界的移动,西太平洋副热带高压面积与强度的变化、脊点位置西伸与北进,以及西风指数的强弱变化等),是影响和控制渤海海域波气长期变化的主要原因。
[Abstract]:The study of ocean wave variation is the key to understand the response of ocean dynamic processes to climate change. The Bohai Sea is located in a special geographical location, which makes the waves of the Bohai Sea fluctuate periodically under the influence of the long term wind field. In this paper, using the data of 10 m wind field in Bohai Sea from 1950 to 2011 NCEP reanalysis data, the effective wave height, wave direction and wave period of monthly Bohai Sea wave are simulated by using SWAN model, and the variation characteristics of wave climate in this sea area are analyzed. The results show that the effective wave height in the Bohai Sea from 1950 to 2011 shows a downward trend, the wave direction angle shows an upward trend, the wave period is relatively stable, and the wave period slightly increases. The average decrease of effective wave height is 0.12 掳/ a, and the angle of wave direction is increased by 0.12 掳/ a. The effective wave height appeared abrupt point around 1968, the wave direction angle changed about 1960, and the wave period appeared abrupt point around 1965. The wave phenological variation in the Bohai Sea is closely related to the sea-air oscillation and is the result of large-scale atmospheric circulation variation. Under the background of long-term climate change, the long-term variation of the East Asian circulation weather system (including the intensity of the East Asian monsoon, the movement of the northern boundary of the summer monsoon), The variation of the area and intensity of the subtropical high in the western Pacific Ocean, the westward extension and northward movement of the ridge, and the variation of the westerly index are the main reasons that influence and control the long-term variation of the wave gas in the Bohai Sea.
【作者单位】：中国科学院地理科学与资源研究所;中国科学院大学;
【基金】：国家自然科学基金41271026~~
【分类号】：P434;P731

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