低风速下海面附近气温场对海气动量通量的影响

EFFECTS OF TEMPERATURE STRATIFICATION NEAR SEA SURFACE ON MOMENTUM FLUX BETWEEN AIR AND SEA AT LOW WIND SPEED THROUGH

用实测的海上５层平均风剖面数据和温度剖面数据，通过数据回归和迭代方法计算出了在不同大气稳定情况下的海面阻力系数．得到了与前人理论计算一致的结论：海面阻力系数随海面大气稳定度的增加而减小．另外，我们还发现：在海面风速小于１３ｍ／ｓ时，不能认为气温剖面外推到海面的值与海面水温的值是一致的．这样若用海气温差作为衡量海面上方大气的稳定程度，难于得到上面给出的合理结论．这一点同前人的理论计算结果是不相同的．

Measurement data of wind speed and air temperature from five levels are used to calculate the air-sea momentum tranfer coefficients under different.atmospheric atabilities for this purpose,the regression and iterative methods ars employed.The result consistent with previous theoretical analyses is obtained,that is, the transfer coefficient decreases with increasing stability.It is also found that when wind speed is less than 13m/s,the extrapolated air temperature for z=z0 is not necessarily equal to the SST at that spot,in other words,if the water-air temperature difference is used as the parameter indicating the atmospheric stability, the above reasonable conclusion can not be reached.This is quite different from the previous theorecal results.