ESTIMATES OF SEA SURFACE FLUXES DURING TOGA-COARE IOP

With the marine ship observation data set obtained by three cruise-phases of Chinese Xiangyanghong 5 from November 5,1992 to February 19,1993 in the TOGA-COARE IOP at 2°S,156°E.the sea surface fluxes at this point are estimated by three different bulk schemes.Firstly.a quasi-linear relation is found between the neutral drag coefficients and wind speed.Then,the stability-dependent drag and heat transfer coefficients are solved in the iterative method.Based on thus-derived transfer coefficients,the momentum,sensible and latent heat fluxes are calculated.In the warm pool region,the fluxes corresponding to the westeily winds are much greater than those of the easterly trade winds.The magnitude of sea surface fluxes depends upon the atmospheric stability as well,in particular in the case of weak wind condition.The estimated sea surface net heat budget shows that considerable amount of heat transport from ocean to atmosphere is mainly produced by the effective longwave radiation,latent and sensible heat fluxes.Among them the value of latent heat flux is the largest and the sensible heat flux is the smallest.Finally,an accuracy analysis is made by direct measurements with the eddy-correlation method on the Japanese R/V Hakuho board at the same time.It is shown that the bulk-derived fluxes are acceptable with much confidence.The estimated effective longwave radiation is used to compare with those by direct observations on Xiangyanghong 5.This research is compared with TOGA investigation in the tropical western Pacific.