北太平洋海气界面湍流热通量的年际变化  

Interannual Variability of Air-Sea Turbulent Heat Fluxes over the North Pacific

作　　者：郑建秋[1] 任保华[1] 李根[1] 

机构地区：[1]中国科学技术大学地球和空间科学学院,合肥230026

出　　处：《大气科学》2009年第5期1111-1121,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金资助项目40675028;国家重点基础研究发展规划项目2006CB403600;中国科学技术大学青年基金资助项目

摘　　要：本文采用美国伍兹霍尔海洋研究所客观分析海气通量项目提供的1958～2006年月平均的湍流热通量及相关气象场数据,利用EOF分析、小扰动方法、线性回归、相关分析等方法研究了北太平洋海气界面湍流热通量年际变化的时空特征、影响因子及其与大气环流的关系。结果表明,北太平洋湍流热通量的年际变化在冬季最为显著。我国东部海域及其向中东太平洋的延伸部分为冬季潜热通量和感热通量年际变化的关键区。冬季潜热通量的年际变化在副热带太平洋和菲律宾海域主要受风速变化影响,在北太平洋的高纬和低纬海域尤其是赤道中太平洋主要受比湿差变化影响,而冬季感热通量的年际变化在整个北太平洋都主要受海气温差变化影响。受大尺度环流影响,异常低压中心的东（西）侧海气比湿差和海气温度差偏小（偏大）,所以异常低压中心的东（西）侧潜热输送和感热输送偏弱（偏强）。Based on the monthly turbulent heat fluxes and related meteorological variables datasets （1958-2006） from Objectively Analyzed Air-Sea Fluxes （OAFlux） Project of Woods Hole Oceanographic Institution, the temporal and spatial characteristics, influence factors of interannual variability of air-sea turbulent heat fluxes over the North Pacific and its relation to atmospheric circulation are studied by means of empirical orthogonal functions （EOF） analysis, perturbation method, linear regression and correlation analysis. The result shows that interannual variabilityof air-sea turbulent heat fluxes over the North Pacific is the most prominent in winter among the four seasons. The East China Sea and its extension to the mid-eastern Pacific are the key regions of interannual variability of air-sea turbulent heat fluxes over the North Pacific. The anomalous wind speed has the greatest influence on the interannual variability of latent heat fluxes in winter in the subtropical Pacific and the Philippine Sea, while the anomalous specific humidity difference has the greatest impact in the high-latitude and low-latitude oceans, especially in the equatorial mid-Pacific. The interannual variability of sensible heat fluxes in winter depends primarily on the air-sea temperature difference anomalies in the whole North Pacific. Under the influence of large-scale atmospheric circulation, negative （positive） air-sea specific humidity difference and temperature difference anomalies tend to occur to the east（west） of an anomalous low, therefore negative （positive） latent heat fluxes and sensible heat fluxes anomalies are found to the east （west） of an anomalous low.

关 键 词：潜热通量 感热通量 年际变化 

分 类 号：P732[天文地球—海洋科学]