The observation and analysis on the deviation of wind stress direction from wind direction
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摘要: 针对海气界面风应力方向与风向不一致的现象,2015年2月4日至3月12日在南海博贺观测平台开展了综合观测,利用涡动相关法计算了海气界面风应力,并在3类大气稳定度条件下分析了风应力矢量偏离风矢量的角度变化,进一步讨论了大气层结稳定时两者角度之差与风速的参数化关系。结果表明:在大气层结稳定条件下,风应力矢量偏向风矢量左侧,且偏离角度随逆波龄和风速增大而减小;当大气层结不稳定时,风应力矢量一般偏向风矢量右侧。海气界面风应力矢量受海表面风、波浪以及大气层结的共同调制。Abstract: Focusing on the inconsistent phenomenon between wind stress direction and wind direction on the air-sea interface, we designed comprehensive observation at the Bohe Station of the South China Sea from February 4 to March 12, 2015. The wind stress was calculated by using the eddy correlation method, the deviation angle between the wind stress and wind vector was analyzed under 3 different atmospheric stability conditions. Furthermore, the parametric relationship between the angle and wind speed was proposed under the stable atmospheric stability condition. Results showed that the stress vector is to the left of the wind for the air stable condition, besides, the deviation angle decreases with the increase of inverse wave age and wind speed, while the stress vector is generally to the right of the wind for the unstable case. The wind stress vector depends on not only the sea surface winds, but also on the surface waves and atmospheric stable conditions.
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