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Li Peng,Shi Benwei,Li Yangang,Wang Sijian,Lv Xin,Wang Yaping,Tian Qing. 2020. Characterization of longshore currents in southern East China Sea during summer and autumn. Acta Oceanologica Sinica, 39(3):1-11
Characterization of longshore currents in southern East China Sea during summer and autumn
东海南部海域夏秋季沿岸流特征
Received:June 15, 2019  
DOI:10.1007/s13131-020-1538-8
Key words:northeast Taiwan  ocean current  summer and autumn  typhoon
中文关键词:  台湾东北海域  海流  夏秋季节  台风
基金项目:The National Key Research and Development Program of China under contract No. 2016YFC1401207; the National Natural Science Foundation of China under contract No. 41625021; the Natural Science Foundation of Jiangsu Province under contract No. BK20170953.
Author NameAffiliationE-mail
Li Peng Forecast Center for East China Sea, State Oceanic Administration, Shanghai 200136, China  
Shi Benwei State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China bwshi@sklec.ecnu.edu.cn 
Li Yangang Forecast Center for East China Sea, State Oceanic Administration, Shanghai 200136, China  
Wang Sijian Forecast Center for East China Sea, State Oceanic Administration, Shanghai 200136, China  
Lv Xin Forecast Center for East China Sea, State Oceanic Administration, Shanghai 200136, China  
Wang Yaping State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China  
Tian Qing School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China  
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Abstract:
      Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 2015. Our results are:(1) The current was mainly a (clockwise) rotating flow, displaying reciprocating flow characteristics, and vertically the current directions were the same throughout the vertical profile. (2) The horizontal current speed was strongest during August (summer) with an average speed of 51.8 cm/s. The average current speeds during spring tides were highest in August and weakest in September, with speeds of 59.9 and 42.8 cm/s, respectively. (3) Considerable differences exist in average current speeds in different layers and seasons. The highest average current speeds were found in the middle-upper layers in August and in the middle-lower layers in September and October. (4) The residual current speed was highest in August, when the speed was 12.5-47.1 cm/s, whereas the vertical average current speed was 34.3 cm/s. The depth-averaged residual current speeds in September and October were only 50% of that in August, and the residual current direction gradually rotated in a counter-clockwise direction from the lower to surface layers. (5) Typhoon waves had a significant influence on the currents, and even affected the middle and lower water layers at depths of >70.0 m. Our results showed that the currents are controlled by the dynamic interplay of the Taiwan Warm Current, incursion of the Kuroshio Current onto the continental shelf, and monsoonal changes.
中文摘要:
      为了揭示东海南部海域海流的夏秋季节变化特征和垂向变化规律,于2015年7月28日-10月25日在东海南部海域(平均水深105.0 m,平均潮差1.21 m)利用ADCP潜标和大型浮标进行了连续90天的剖面海流、潮汐、风速风向和波浪的观测。结果表明:(1)海流流向以旋转流为主,兼具往复流特性,涨潮流为北偏西方向,落潮流为东-东南向,旋转方向为顺时针方向,在垂向上流向分布较一致。(2)东海南部海域水平流速总体较大,8月份(夏季)的海流最强,平均流速为51.8 cm/s,各月的最大流速均大于120.0 cm/s,最大流速达202.0 cm/s,出现在8月台风期间。大潮的平均流速8月份最大(59.9 cm/s),9月份最小(42.8 cm/s),大潮平均流速为小潮的1.5~1.7倍。(3)各层和各季节平均流速垂向变化差异较大, 8月份中上层水体流速最大,9和10月份中下层水体流速最大。(4)余流的流速和流向存在显著的时空变化,8月份最强,为12.5~47.1 cm/s,平均余流达34.3 cm/s,9月和10月份平均余流大小仅为8月份的50%。余流的流向从底层至表层呈逆时针方向旋转。(5)台风对海流的影响显著,台风期间,海浪甚至影响到中下层水体,深度达70.0 m以上。该海域的海流受台湾暖流、黑潮和季风等动力作用的共同制约。
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