【摘要】 本文基于高分辨率ROMS(Regional Ocean Modeling System)模式在中国海区域1980—2019年共40 a的模拟结果，研究了西南黄海环流的存在性及成因、季节变化特征等，并初步探究了西南黄海环流与黄海浒苔灾害年际差异之间的关系。结果表明：顺时针方向的西南黄海环流终年存在于山东半岛南部35.0°N—36.5°N、120°E—122°E海域，其强度在6和10月最强，1和8月最弱，具有显著的双峰型季节变化特征，环流中心位置随季节东西移动。以6月为典型月份，本文利用一层简单模型及矢量场的经验正交函数分解方法，进一步分析发现，风应力旋度是影响西南黄海环流年际变化的主要因素，风应力负旋度越强，西南黄海环流越强。最后，本文初步建立了西南黄海环流与黄海浒苔分布年际变化之间的关系，由于西南黄海环流特殊的地理位置，在其中心位置偏西的年份，环流在一定程度上会限制浒苔的北向输运，造成堆积，给沿岸城市带来更严重的负面影响。更多还原

【Abstract】 The existence, generation and seasonal variability of the southwestern Yellow Sea circulation(SYSC) over past 40 years from 1980 to 2019 are investigated by using ROMS(Regional Ocean Modeling System) with high resolution. The relationship between the SYSC and the interannual variability of Enteromorpha prolifera disaster in the Yellow Sea is also preliminarily studied. Results show that the anticyclonic southwestern Yellow Sea circulation exists in 35.0°N—36.5°N, 120°E —122°E region south of the Shandong Peninsula all the year, which achieves a maximum speed in June and October and a minimum speed in January and August. The seasonal variations of the SYSC fluctuates with a bimodal shape. The position of the center of the SYSC moves in the east-west direction on seasonal timescales. Taking June as a typical case, the study further find that local wind stress curl is a significant factor affecting the interannual variations of the SYSC by using a simple one-layer ocean model and empirical orthogonal function analysis of the vector fields. The intensity of the SYSC gets stronger with increased local wind stress curl. Finally, the relationship between the SYSC and the interannual variability of the Enteromorpha prolifera distribution in the Yellow Sea is established in this study. Due to the special geographic position of the SYSC, the northward transport of the Enteromorpha prolifera is trapped by the SYSC at a certain degree, which occurs in the year of the center of the SYSC westward. The accumulated Enteromorpha prolifera induces significantly negative effect to the coastal city.更多还原