2020/2021年冬季渤海海流变化观测

IF 2.1 4区 地球科学 Q2 MARINE & FRESHWATER BIOLOGY
Zizhou Liu , Fangguo Zhai , Yanzhen Gu
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引用次数: 0

摘要

渤海水动力条件对区域气候和海洋生态系统的变化具有重要的调节作用。本研究利用2020年11月/ 12月至2021年3月在南中国海西部(S1)和东南(S2)两个站点的连续现场观测,研究了南中国海冬季洋流的变化。结果表明,S1处的剩余电流及其变化均大于S2处。剩余电流垂直变化显著,上下两层方向几乎相反。两个站点的上层残余流均以东南方向为主,下层残余流在S2处沿南BS深槽地形基本为西北偏西方向,而在S1处沿坡向上海岸方向基本为西北偏北方向。上层残流具有强烈的次表层强化特征,且具有明显的季节变化特征。上层次表层流由2020年12月的偏弱转变为2021年1 - 2月的偏强,尤其在BS西部。浅水区表层风直接驱动表层流,遵循Ekman层动力学。弱/强次表层流发生在持续的强海面风期间/之后,这意味着它们比表层流经历了更复杂的动力学过程。这一研究结果对BS冬季环流格局有了新的认识。这有助于全面认识冬季BS环流变化的特征、潜在动力及其对生物地球化学过程的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observed current variations in the Bohai Sea in the winter of 2020/2021

Hydrodynamic conditions in the Bohai Sea (BS) play an important role in regulating variabilities in the regional climate and marine ecosystem. In the current study, wintertime current variations in the BS were investigated using continuous in situ observations at two sites in the western BS (S1) and southeastern BS (S2) from November/December 2020 to March 2021. The results indicated that residual currents and their variations were both stronger at S1 than at S2. Residual currents had notable vertical variations, with nearly opposite directions in the upper and lower layers. Upper layer residual currents were mostly southeastward at both sites, while lower layer residual currents were basically west-northwestward at S2 following the topography in the deep trough in the South BS but were north-northwestward at S1 up the slope to the coast. Upper layer residual currents were strongly subsurface-intensified and experienced significant intraseasonal variations. Subsurface currents in the upper layer shifted from being weak in December 2020 to strong in January–February 2021, especially in the western BS. Surface currents were directly driven by surface winds following the Ekman layer dynamics in shallow waters. Weak/strong subsurface currents occurred during/after sustained strong sea surface winds, implying that they experienced more complex dynamics than surface currents. This study provides new understanding to the wintertime circulation pattern in the BS. It is helpful for fully understanding the characteristics and underlying dynamics of the BS circulation variations in winter and their impacts on biogeochemical processes.

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来源期刊
Journal of Sea Research
Journal of Sea Research 地学-海洋学
CiteScore
3.20
自引率
5.00%
发文量
86
审稿时长
6-12 weeks
期刊介绍: The Journal of Sea Research is an international and multidisciplinary periodical on marine research, with an emphasis on the functioning of marine ecosystems in coastal and shelf seas, including intertidal, estuarine and brackish environments. As several subdisciplines add to this aim, manuscripts are welcome from the fields of marine biology, marine chemistry, marine sedimentology and physical oceanography, provided they add to the understanding of ecosystem processes.
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