英文摘要：The responses of surface wind stress to the mesoscale sea surface temperature (SST) anomalies associated with the SST front in the northern South China Sea (NSCS) are studied using satellite observations and reanalysis data. Both satellite and reanalysis data explicitly show the linear relationships between the spatial-high-pass filtered wind stress perturbation derivatives and the underlying SST gradient field. However, the noise in the linear relationships is much smaller in the reanalysis data than in the satellite observations. This result is rarely reported in other frontal areas. The wavelet analysis shows that the satellite scatterometer observed numerous high wavenumber perturbations within 100 km in the NSCS, but these perturbations were absent in the reanalysis data. The linear relationship between the perturbation SST gradient and derivative wind stress fields is not significant at this scale, which enhances the noise in the linear relationship. The spatial bandpass-filtered perturbation between 100 and 300 km can give reasonable estimates of the coupling coefficients between the wind stress divergence and downwind SST gradient (αd) and between the wind stress curl and crosswind SST gradient (αc) in the NSCS, with values of 1.33 × 10?2and 0.95 × 10?2 N m?2C?1, respectively.
南海北部温度锋空间尺度调制对海表风应力响应的影响
中文摘要：基于卫星观测和再分析数据，本文研究了海表面风应力对南海北部（NSCS）温度锋导致的中尺度海表面温度（SST）异常的响应。卫星数据和再分析数据都显示了空间高通滤波后风应力与底层SST梯度之间的线性关系。然而，再分析数据的线性关系噪声比卫星观测的小得多，这一结果在其他锋面研究中鲜有提及。小波分析表明，卫星散射计在南海北部100 km内观测到大量高波数扰动，而这些扰动在再分析数据中是不存在的。扰动SST梯度与风应力梯度之间的线性关系在这一尺度上不显著，进而使线性关系中的噪声增强。100 km和300 km之间的空间带通滤波可以估计风应力散度和沿风向SST梯度（ad）之间，以及风应力旋度和跨风向SST梯度（ac）之间的耦合系数，耦合系数分别为1.33 × 10?2和0.95 × 10?2 N m?2C?1。