| WANG Hui,LIU Kexiu,QI Dongmei,GAO Zhigang,FAN Wenjing,ZHANG Zengjian,WANG Guosong. 2016. Causes of seasonal sea level anomalies in the coastal region of the East China Sea. Acta Oceanologica Sinica, 35(3):21－29 |
| Causes of seasonal sea level anomalies in the coastal region of the East China Sea |
| 东海沿海季节性海平面异常成因 |
| Received:November 14, 2014 Revised:July 24, 2015 |
| DOI：10.1007/s13131-016-0825-x |
| Key words:sea level anomalies ECS wind air pressure SST air temperature oscillations |
| 中文关键词: 海平面异常 ECS 风 气压 海温 气温 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | WANG Hui | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | | | LIU Kexiu | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | | | QI Dongmei | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | | | GAO Zhigang | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | gzg_ocean@163.com | | FAN Wenjing | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | | | ZHANG Zengjian | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | | | WANG Guosong | National Marine Data and Information Service, State Oceanic Administration, Tianjin 300171, China | |
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| Abstract: |
| Based on the analysis of sea level, air temperature, sea surface temperature (SST), air pressure and wind data during 1980-2013, the causes of seasonal sea level anomalies in the coastal region of the East China Sea (ECS) are investigated. The research results show:(1) sea level along the coastal region of the ECS takes on strong seasonal variation. The annual range is 30-45 cm, larger in the north than in the south. From north to south, the phase of sea level changes from 140° to 231°, with a difference of nearly 3 months. (2) Monthly mean sea level (MSL) anomalies often occur from August to next February along the coast region of the ECS. The number of sea level anomalies is at most from January to February and from August to October, showing a growing trend in recent years. (3) Anomalous wind field is an important factor to affect the sea level variation in the coastal region of the ECS. Monthly MSL anomaly is closely related to wind field anomaly and air pressure field anomaly. Wind-driven current is essentially consistent with sea surface height. In August 2012, the sea surface heights at the coastal stations driven by wind field have contributed 50%-80% of MSL anomalies. (4) The annual variations for sea level, SST and air temperature along the coastal region of the ECS are mainly caused by solar radiation with a period of 12 months. But the correlation coefficients of sea level anomalies with SST anomalies and air temperature anomalies are all less than 0.1. (5) Seasonal sea level variations contain the long-term trends and all kinds of periodic changes. Sea level oscillations vary in different seasons in the coastal region of the ECS. In winter and spring, the oscillation of 4-7 a related to El Ni.o is stronger and its amplitude exceeds 2 cm. In summer and autumn, the oscillations of 2-3 a and quasi 9 a are most significant, and their amplitudes also exceed 2 cm. The height of sea level is lifted up when the different oscillations superposed. On the other hand, the height of sea level is fallen down. |
| 中文摘要: |
| 本文通过对东海沿海1980-2013年的海平面、气温、海温、气压和风等水文气象资料的分析,初步探讨了东海沿海季节性海平面异常变化的成因。结果表明:(1)东海沿海海平面季节变化明显,海平面年变化幅度在30~45厘米,年变幅北大南小。自北至南,海平面的位相变化从140°到231°,相差近3个月。(2)东海沿海月均海平面变化异常的月份基本发生8月至翌年的2月,其中,1-2月和8-10月月均海平面异常的次数最为集中,且近年有增多的趋势。(3)风场的异常变化是影响东海沿海海平面变化的重要因素,东海沿海月均海平面的异常变化与风场和气压场有密切的关系,由风引起的风生流与海平面的高度场变化基本一致。2012年8月,沿海台站由风驱动的海平面高度占海平面异常变化的50%-80%。(4)在东海沿海,海平面、海温和气温等水文气象要素的年变化基本一致,但季节海平面的异常偏高或者偏低与海温和气温的相关性较小,相关系数小于0.1。(5)东海沿海季节海平面的变化包含了长期趋势变化和各种周期性变化,存在着明显的年际和年代变化特征。东海沿海海平面在不同季节振荡周期存在差异,冬、春季与厄尔尼诺相关的4-7a的周期较为明显,其振幅超过2cm;夏、秋季海平面以2-3a和准9a的周期最为显著,其振幅均超过2cm。当不同周期的振荡高位相叠加时,抬升海平面的高度,反之则降低海平面的高度。 |
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