台湾海峡及其邻近海域海面温度锋的卫星遥感观测

Satellite observations of the thermal front in the Taiwan Strait and its adjacent seas

使用1989-2001年的NOAA AVHRR图像，研究了我国台湾海峡及其邻近海域的海面温度锋．卫星遥感观测表明，该海域海面温度锋终年存在，锋面沿50～100m等深线分布，西段呈西南西一东北东走向，东段以舌状向北突出，长约470km．给出了该海域海面温度锋的多年月平均、季平均和年平均特征值．统计结果显示，锋的平均强度、平均最大强度和平均宽度分别为0．147，0．281℃／km和15．15km．锋的各种特征存在明显的季节和年际变化．锋的不稳定性普遍存在，沿锋面常形成半环状的锋波，使锋面呈半环状波动分布．锋波形成的时间尺度约为1～7d，锋的波长约为35～133km，年平均波长为63km，波幅为25-70km．锋面的波动向北东北方向传播，并存在锋面整体向北东北的平移现象．

Thermal infrared images from the NOAA AVHRR taken over 13 a between 1989 and 2001 have been used to study the sea surface thermal front in the Taiwan Strait and its adjacent seas. Information about the location, length, width and strength of the front has been retrieved from the thermal infrared im- ages. Satellite observations have revealed that the front exists all year round and has a length of 470 kin. The frontal location coincides approximately with 50 m offshore depth contour. The frontal width and strength vary with time, with average values of about 15.15 km and 0. 147 ℃/km respectively. The front is instable and characterized by the presence along its edges of eddies which have a time scale of 1-7 d and a length of 25-70 km.