Response of upwelling in eastern Guangdong and southern Fujian coastal seas to the local wind variation

Cai Shangzhan; Jing Chunsheng; Xu Jindian; Zhu Dayong

doi:10.3969/j.issn.0253-4193.2016.09.001

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Cai Shangzhan, Jing Chunsheng, Xu Jindian, Zhu Dayong. Response of upwelling in eastern Guangdong and southern Fujian coastal seas to the local wind variation[J]. Haiyang Xuebao, 2016, 38(9): 1-12. doi: 10.3969/j.issn.0253-4193.2016.09.001

Citation:

Cai Shangzhan, Jing Chunsheng, Xu Jindian, Zhu Dayong. Response of upwelling in eastern Guangdong and southern Fujian coastal seas to the local wind variation[J]. Haiyang Xuebao, 2016, 38(9): 1-12. doi: 10.3969/j.issn.0253-4193.2016.09.001

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Response of upwelling in eastern Guangdong and southern Fujian coastal seas to the local wind variation

doi: 10.3969/j.issn.0253-4193.2016.09.001

Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

Received Date: 2015-09-02
Rev Recd Date: 2016-01-23

Abstract

Abstract

Based on the cruise conductivity-temperature-depth(CTD) data, the sea level, current and near bottom temperature data from seabed-based observations, and the wind field data during June to July, 2010, this paper studied the response of upwelling in eastern Guangdong and southern Fujian coastal seas to the local wind variation, while the influence of typhoon was relatively weak. The main conclusions are as follows: (1) The results of power spectrum analyses showed that, the alongshore wind speed component, sea level, current and near bottom temperature showed similar variations with the significant periods of fluctuations in 3.5-4.0 d, 5.0-5.5 d and 8.3-9.0 d. The variation of alongshore wind speed component brought about the fluctuation of the upwelling intensity in 3-9 d frequency band. (2) The response process of upwelling to the local wind variation was like this. Surface water was transported offshore within the surface Ekman layer because of the alongshore component of wind stress. Coastal sea level dropped, a cross-shore pressure gradient set up. The pressure gradient would change following the local wind variation, resulting in enhanced(or weakened) alongshore current and enhanced(or weakened) near bottom cross-shore current. Near bottom temperature changed according to the variation of near bottom cross-shore current. (3) The results of correlation analyses and cross-spectral analysis showed that, the variation of alongshore wind speed component would influence near bottom temperature in upwelling zone within 3 days. The lag time for sea level's response to alongshore wind variation, near bottom (34 m) cross-shore current's response to sea level variation and near bottom temperature's response to near bottom (34 m) cross-shore current variation were 24 h, 7 h and 27 h respectively.
- eastern Guangdong,
- southern Fujian,
- upwelling,
- alongshore wind speed component,
- sea level,
- cross-shore velocity

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References(26)

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