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CHEN Bo,Xu Zhixin,Ya Hanzheng,CHEN Xianyun,Xu Mingben. 2019. Impact of the water input from the eastern Qiongzhou Strait to the Beibu Gulf on Guangxi coastal circulation. Acta Oceanologica Sinica, 38(9):1-11
Impact of the water input from the eastern Qiongzhou Strait to the Beibu Gulf on Guangxi coastal circulation
琼州海峡东部水进入北部湾对广西沿海环流的影响
Received:September 06, 2018??
DOI:10.1007/s13131-019-1472-2
Key words:temperature and salinity characteristics??circulation mechanism??Qiongzhou Strait??Guangxi coast
中文关键词:??温盐特征??环流机制??琼州海峡??广西沿海
基金项目:The National Natural Science Foundation of China under contract No. 41576024; the Key Research and Development Program of Guangxi under contract No. AB16380282; the Guangxi Key Laboratory of Marine Environmental Science Program under contract No. GXKLHY15-01;the Fundamental Research Fund of Guangxi Academy of Sciences under contract No. 2018YBJ301.
Author NameAffiliationE-mail
CHEN Bo?Guangxi Key Laboratory of Marine Environmental Science, Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530007, China?cbgxkxy@163.com?
Xu Zhixin?Guangxi Key Laboratory of Marine Environmental Science, Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530007, China??
Ya Hanzheng?Guangxi Key Laboratory of Marine Environmental Science, Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530007, China??
CHEN Xianyun?Guangxi Key Laboratory of Marine Environmental Science, Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530007, China??
Xu Mingben?Guangxi Key Laboratory of Marine Environmental Science, Beibu Gulf Marine Research Center, Guangxi Academy of Sciences, Nanning 530007, China??
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Abstract:
??????Based on a comparison of synchronized temperature and salinity data collected in the eastern Qiongzhou Strait and at coastal marine stations, this study finds that, in summer, the variation in salinity near the Weizhou Island in Guangxi is similar to that in the eastern and central portions of the Qiongzhou Strait. Additionally, the Beihai Station in Guangxi exhibits a small salinity variation, whereas the Longmen and Bailongwei Stations, both of which are located far from the Qiongzhou Strait, mainly exhibit continental hydrological characteristics in summer. Moreover, a comparison of the multi-year ocean current data from the Qiongzhou Strait and ocean current observations from the Weizhou Island Station and recently installed current-measuring stations shows that the residual current in the Qiongzhou Strait flows westward in winter and summer. The numerical simulation results also indicate that water from the eastern Qiongzhou Strait enters the Beibu Gulf. The characteristics of the temperature and salinity distributions and analyses of the residual currents further confirm that the western Guangdong coastal current is the main source of the westward transport of water in the Qiongzhou Strait. The primary driver of the formation of the western Guangdong coastal current is the westward flow of freshwater from the Zhujiang (Pearl) River. This water enters the Beibu Gulf via the Qiongzhou Strait and enhances the formation of the cyclonic circulation in the northern Beibu Gulf. In summer, the strong influence of the southwesterly wind leads to the formation of a strong northward coastal current along the western coast of the Beibu Gulf. This process promotes the transport of low-salinity diluted water toward the open ocean and the formation of larger-scale cyclonic circulation around Weizhou Island in the eastern Beibu Gulf. The results of this study regarding the effects of the water inflow from the eastern Qiongzhou Strait to the Beibu Gulf on the Guangxi coastal circulation directly challenge conventional conclusions concerning the transport direction of water through the Qiongzhou Strait in winter and summer.
中文摘要:
??????本文通过对琼州海峡东部水域温盐资料和沿岸海洋站同步观测资料的对比发现:夏季,广西涠洲岛盐度变化规律和琼州海峡东部、中部变化规律一致,广西北海略受影响,而远离琼州海峡的龙门和白龙尾两站,则更多反映夏季陆地水文规律。同时,采用琼州海峡多年海流资料和涠洲岛定点站及近期测流站的海流观测资料对比看出,琼州海峡冬夏季余流方向仍然是自东向西。结合数值模拟计算结果,同样得出琼州海峡东部水自东向西进入北部湾的事实。这些温盐分布特征和余流观测结果进一步证实:粤西沿岸流是琼州海峡水向西输运的主要来源,形成粤西沿岸流这种现象的根源在于珠江冲淡水的西向流,它们通过琼州海峡进入北部湾,加强了北部湾北部气旋式环流的形成。夏季,在强的西南风作用下,产生较强北部湾西岸北向沿岸流,促使低盐冲淡水向外海输运,然后在东部涠洲岛附近形成更大范围内气旋式环流。琼州海峡东部水进入北部湾对广西沿海环流影响的研究,直接向琼州海峡冬夏季水体输运方向的传统结论提出了新的挑战。
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