南沙海域大气湍流通量输送特征分析

THE ANALYSIS OF TURBULENT FLUXES TRANSFER CHARACTERISTICS OVER NANSHA SEA REGION

利用１９９４年９月在南沙群岛的渚碧礁（１０°５２′Ｎ，１１４°０４′Ｅ）观测的湍流资料，采用涡旋相关法计算，给出了南沙海域的曳力系数、动量通量、感热通量和潜热通量，并与其它的海气相互作用实验及ＨＥＩＦＥ的结果作了比较。结果表明：该海域的曳力系数ＣＤ＝（１．５４±０．２４）×１０－３；大气向海洋输送的动量通量与水平风速的平方成正比；该海区无论白天还是晚上都是将其贮存的热量以潜热或感热的形式输送到大气中，其中潜热输送占主导地位；感热和潜热输送的日变化不如陆地上明显，感热输送的日均值远比陆地上的小，而潜热输送的日均值却比戈壁沙漠上的大得多。

The drag coefficient and the fluxes of momentum, sensible heat and latent heat for Nansha Islands sea region are described in this paper. The turbulence data were collected from Zhubi Island(10°52′N,114°04′E) of Nansha sea region in September 1994. These fluxes are calculated by the eddy correlation method using these observed data. At the same time, these results are compared with the other air-sea interaction experiments and land surface processes experiment(HEIFE). The results show that the drag coefficient C D is equal to ( am1.54±0.24)×10 -3 in this sea region; the heat of this sea region is transfered into atmosphere in the forms of sensible heat and latent heat during day and night, and the latent heat transfer is main role; the daily variation of sensible heat and latent heat in this sea region is not obvious as same as the land surface; the transfer of the daily mean sensible flux is much less than the land surface; the daily mean latent heat flux is much greater than the Gobi and desert, but it is similar to the oasis.