近海面风场对黄东海域海平面特征影响的分析与模拟

发布时间：2018-01-13 03:34

本文关键词：近海面风场对黄东海域海平面特征影响的分析与模拟　出处：《大气科学学报》2016年01期 　论文类型：期刊论文

【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。
[Abstract]:From 1993 to 2012 based on TOPEX/Poseidon (T/P) satellite sea level abnormal SLA (Sea Level Anomaly) and FSCR (Climate Forecast System data Reanalysis) reanalysis data, the temporal and spatial distribution characteristics of nearly 20 a sea level of the Yellow Sea and East China Sea, especially the different time scale effect of wind field change characteristic, and then through the regional ocean model the possible mechanism of the short-term variation of sea surface height were discussed. The results show that: 1) the Yellow Sea and East China Sea sea level average state to the South than in the north, near the sea surface wind field characteristics of seasonal expansion in shoreline distribution and sea water heat, causing the sea in winter and spring, summer and autumn. The high low, nearly 20 A of the Yellow Sea and East China Sea average wind speed gradually decreased, mean sea level rising rate was 2.9 mm/a.2) short-term wind field is the main activity of disastrous gale, statistics show that winter cold wind and typhoon gale frequency were reduced, strength increased. FVCOM (Finite Volume Community Ocean Model) simulation analysis on the change of typhoon and cold wave under the action of the Yellow Sea and East China Sea sea, found strong wind can form divergence type current cyclonic vortex, the corresponding sea is a concave negative center; north cold wind currents can form anticyclonic and cyclonic vortex, the corresponding sea is of convex positive center strong currents. Part of the two types of vortex enhanced sea tilt.3) strong current part of kinetic energy and momentum rapidly to the deep sea of men, both in depth and strength, caused by the cold current of eddy kinetic energy and momentum transfer than typhoon more quickly and stronger. This cold cooling and ocean stratification caused by instability the effect of convection.

【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;南京信息工程大学海洋动力环境与卫星海洋学实验室;江苏海涂研究中心/江苏海洋环境预报中心;
【基金】：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)
【分类号】：P731.23;P732
【正文快照】： 第五次IPCC报告指出,1901—2010年全球平对于不同时间尺度的变化,其主要的影响因子不同。均海平面上升了0.19 m,平均1.7 mm/a;1993—在气候时间尺度上,一些研究注意到在大洋中纬度2010年平均上升速度则达到3.2 mm/a(IPCC,海域,北太平洋海面高度异常与北太平洋年代际振2013)。2

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