2002年南海季风爆发前后西沙海区海-气通量交换及其变化

利用2002年4月24日至6月20日在西沙海区进行的第三次南海海-气通量观测试验资料，采用涡相关法和TOGA COARE2.5b版本通量计算方案，计算了西南季风爆发前后海洋-大气间的通量交换，讨论了辐射、动量、感热通量、潜热通量、海洋热量净收支的时间变化特征及其与气象要素变化的关系.结果表明：西南季风爆发前后，太阳短波辐射、海面净辐射、潜热通量和海洋热量净收支变化特别强烈；通量变化受不同环境要素的影响：感热通量与海-气温差呈正相关关系，与气温呈明显的负相关关系.潜热通量与风速、海-气温差及海面水温均有正相关关系，其中与风速的关系最密切.动量通量（τ）主要随风速变化，它与风速（V）的关系可以表示为τ=0.00185V2-0.00559V+0.01248.

Air-sea flux exchange and variation over the Xisha sea area before and after the onset of southwest monsoon in 2002

The 3rd South China Sea (SCS) air sea flux measurement was conducted in the Xisha sea area from April 24 to June 22, 2002 The heat flux (latent and sensible heat) exchange and momentum exchange were computed using the eddy correlation method and TOGA COARE25b algorithms. Variations of radiation components, heat and moisture flux exchange and relations with the synoptic condition were analyzed. The results indicate that heat and moisture fluxes changed significantly before and after the onset of SCS monsoon, especially short wave radiation, net radiation budget of ocean surface, latent heat flux and net oceanic heat flux. Relationships of sensible heat flux, latent heat flux and momentum fluxes with meteorological elements are different. Sensible heat flux has a positive correlation with air sea temperature difference TW-Ta. Latent heat flux has a positive correlation with wind speed, TW-Ta and SST, especially with wind speed. Momentum fluxes(τ) varies with wind speed(V) as a function:τ=000185V2-000559V+001248