Characterization of longshore currents in southern East China Sea during summer and autumn

Peng Li; Benwei Shi; Yangang Li; Sijian Wang; Xin Lv; Yaping Wang; Qing Tian

doi:10.1007/s13131-020-1538-8

Volume 39 Issue 3

Apr. 2020

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Peng Li, Benwei Shi, Yangang Li, Sijian Wang, Xin Lv, Yaping Wang, Qing Tian. Characterization of longshore currents in southern East China Sea during summer and autumn[J]. Acta Oceanologica Sinica, 2020, 39(3): 1-11. doi: 10.1007/s13131-020-1538-8

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Characterization of longshore currents in southern East China Sea during summer and autumn

doi: 10.1007/s13131-020-1538-8

1.
Forecast Center for East China Sea, State Oceanic Administration, Shanghai 200136, China
2.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China
3.
School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, China

Funds: 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.

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Corresponding author: Email: bwshi@sklec.ecnu.edu.cn
Received Date: 2019-06-15
Accepted Date: 2019-08-16

Available Online: 2020-04-21

Publish Date: 2020-03-25

Abstract

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.
- northeast Taiwan,
- ocean current,
- summer and autumn,
- typhoon

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