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| 渤海海峡水交换多时间尺度变化特征研究 |
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冀承振1,2, 黎舸1,2, 于博1,2, 董琳1,2, 刘清容1,2
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1.国家海洋局北海预报中心 青岛 266061;2.山东省海洋生态环境与防灾减灾重点实验室 青岛 266061
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| 摘要: |
| 基于长时间的FRA-JCOPE数据，本文着重对渤海海峡水交换的多时间尺度变化特征进行了分析。通过分析认为，渤海海峡水交换具有明显的季节（360天和180天周期）、季节内（120天周期）和年际变化特征，且空间分布呈现较为明显的"南出北进"特点。360天季节变化特征表现为夏强冬弱，局地风场、海峡两侧海表高度梯度、陆地径流的季节变化对其具有重要影响；180天周期的季节变化和120天周期季节内变化信号与局地风场关系不大，主要受到海峡两侧海表高度梯度的调制。同时，渤海海峡水交换受1997-1998年ENSO影响较为显著：正常年份时，渤海海峡水交换流入、流出量基本相当，但当1997-1998年ENSO显著年份时，流出量略大于流入量，这是由于黄渤海环流增强，进而导致渤海海峡水交换增强造成的。 |
| 关键词: 水交换 季节内变化 季节变化 年际变化 渤海海峡 |
| DOI：10.11693/hyhz20180400079 |
| 分类号:P731 |
| 基金项目:国家重点研发计划项目，2016YFC1402000号；国家自然科学基金项目，U1706216号；海洋公益性行业科研专项项目，2013418031号。 |
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| THE MULTI-TIME SCALE VARIATIONS OF WATER EXCHANGE ACROSS THE BOHAI STRAIT |
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JI Cheng-Zhen1,2, LI Ge1,2, YU Bo1,2, DONG Lin1,2, LIU Qing-Rong1,2
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1.North China Sea Marine Forecasting Center of State Oceanic Administration, Qingdao 266061, China;2.Shandong Provincial Key Laboratory of Marine Ecological Environment and Disaster Prevention and Mitigation, Qingdao 266061, China
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| Abstract: |
| Based on the long-term FRA-JCOPE data, we studied the multi-time scale variations of water exchange across the Bohai Strait. Results revealed distinct characteristics of seasonal (360 and 180d), intraseasonal (120d), and interannual variations of the water exchange. The water flows into the Bohai Sea via the northern Bohai Strait and flows out via the southern Bohai Strait. The water exchange is strong in summer and weak in winter. Seasonal variations of local wind, sea surface height on both side of the strait, and the in-bay rivers are the main factors on the water exchange. The periods of 180 d and 120d are controlled by the sea surface height change. Meanwhile, the 1997-1998 ENSO event considerable enhanced the circulation between the Bohai Sea and the Yellow Sea, and so did the water exchange. |
| Key words: water exchange intraseasonal variation seasonal variation interannual variation the Bohai Strait |