| 近海面风场对黄东海域海平面特征影响的分析与模拟 |
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| 引用本文： | 王坚红,于华,苗春生,彭模,黄祖英.近海面风场对黄东海域海平面特征影响的分析与模拟[J].大气科学学报,2016,39(1):90-101. |
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| 作者姓名： | 王坚红 于华 苗春生 彭模 黄祖英 |
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| 作者单位： | 南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;南京信息工程大学海洋动力环境与卫星海洋学实验室, 江苏南京 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;南京信息工程大学海洋动力环境与卫星海洋学实验室, 江苏南京 210044;南京信息工程大学气象灾害预报预警与评估协同创新中心, 江苏南京 210044;江苏海涂研究中心/江苏海洋环境预报中心, 江苏南京 210036;江苏海涂研究中心/江苏海洋环境预报中心, 江苏南京 210036 |
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| 基金项目： | 国家自然科学基金资助项目(41276033);国家科技支撑资助项目(2012BAH05B01);公益性行业(气象)科研专项(GYHY201206068);江苏科技支撑资助项目(BE2012774;BE2014729);中国气象局气候变化专项资助项目(CCSF201318);江苏高校优势学科建设工程资助项目(PAPD) |
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| 摘 要： | 基于1993—2012年TOPEX/Poseidon(T/P)卫星海平面异常SLA(Sea Level Anomaly)数据和FSCR(Climate Forecast System Reanalysis)再分析风场资料,分析黄东海域近20 a海平面的时空分布特征,尤其是不同时间尺度风场影响的变化特征,进而通过区域海洋模式对海面高度短期变化的可能机制进行探讨。结果表明:1)黄东海域海平面多年平均状态为南高北低,近海面季节性风场在岸线分布和海水热膨胀特征下,造成海面冬春季偏低,夏秋季偏高。近20 a黄东海域平均风速逐步减弱,平均海面上升速率为2.9 mm/a。2)风场的短期活动主要为灾害性大风,统计显示冬夏寒潮大风和台风大风均呈频数减少、强度增强的趋势。运用FVCOM(Finite Volume Community Ocean Model)模拟分析台风和寒潮作用下黄东海域海平面的变化,发现台风强风可形成辐散式海流气旋式涡旋,对应海面为下凹负值中心;北路寒潮大风可形成海流反气旋式涡旋,对应海面为上凸正值中心。两类涡旋的强海流部分增强了海面倾斜度。3)强海流部分动能和动量迅速向海水深部下传,无论在深度和强度上,寒潮造成的海流涡旋动能和动量下传比台风涡旋更迅速,更强。这与寒潮降温引起的海洋层结不稳定对流作用有关。
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| 关 键 词： | 黄东海域 海平面变化 风应力 灾害性大风 数值模拟 |
| 收稿时间： | 2014/5/29 0:00:00 |
| 修稿时间： | 2015/12/7 0:00:00 |
Analysis and simulation of the wind fields impact on sea level features of Yellow Sea and East China Sea |
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| WANG Jianhong,YU Hu,MIAO Chunsheng,PENG Mo and HUANG Zuying.Analysis and simulation of the wind fields impact on sea level features of Yellow Sea and East China Sea[J].大气科学学报,2016,39(1):90-101. |
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| Authors: | WANG Jianhong YU Hu MIAO Chunsheng PENG Mo and HUANG Zuying |
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| Institution: | Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;Laboratory of Ocean Dynamic Environment and Satellite Oceanography, Nanjing University of Information Science & Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;Laboratory of Ocean Dynamic Environment and Satellite Oceanography, Nanjing University of Information Science & Technology, Nanjing 210044, China;Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China;Jiangsu Tidal Flat Research Center/Jiangsu Ocean Environment Forecast Center, Nanjing 210036, China;Jiangsu Tidal Flat Research Center/Jiangsu Ocean Environment Forecast Center, Nanjing 210036, China |
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| Abstract: | Based on the TOPEX/Poseidon(T/P) satellite sea level anomaly(SLA) data during 1993-2012 and FSCR(Climate Forecast System Reanalysis) wind data,the temporal-spatial features of sea level of Yellow Sea and East China Sea within the 20 years are analyzed.The impacts of wind fields within different periods on the sea level are investigated,and the possible mechanisms of sea level change of short duration are studied by FVCOM(Finite Volume Community Ocean Model).The results show that the average sea level of Yellow Sea and East China Sea in recent 20 years is high in southern and low in northern;seasonal wind fields near the sea surface with coastal distribution and sea water thermal swelling together force the sea level plus deviations in summer and autumn,and minus deviations in winter and spring.The average wind speed near the sea surface is gradually decreasing and the sea level rising speed is about 2.9 mm/a during the 20 years.The short duration actions of wind field mainly present as disastrous wind events.According to statistics,both the summer typhoon and the winter cold wave show a trend of decrease in frequency and increase in intensity during the 20 years.The FVCOM model is used to simulate and analyze the sea level changes of Yellow Sea-East China Sea under typhoon and cold wave impacts,and results show that the strong typhoon wind creates the divergent cyclone vortex of sea current with sea level of negative low surface center,while the strong cold wave wind from north creates the anti-cyclone vortex of sea current with sea level of positive high surface center.The strong sea current areas in the two types of vortexes increase the sea surface gradient.Due to the unstable sea temperature profile with depth and the active convection impact caused by the winter cold wave,the kinetic energy and momentum were transported downwards more faster in depth and intensity,compared with that of summer typhoon. |
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| Keywords: | Yellow-East seas sea level change wind stress disasters wind numerical simulation |
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