论文部分内容阅读
通过优化劈窗算法,建立适合长江口水域的海表温度反演模型,利用2000年至2012年的Terra-MODIS LIB晴空数据进行海表温度反演,得到长江口13年海表温度数据集,分析长江流域进入河口的水沙变化后河口水域海表温度的年际变化和季节性变化。结果表明:长江口海表温度主要受太阳辐射影响,温度场的空间分布由口内至外海呈现阶梯性变化。受海域潮流上溯和径流下泄的影响,口内口外的海表温度表现出不同的季节性变化特征:冬季,口外高口内低;夏季,则口外低,口内高。伴随着冬季流域进入河口的径流量增加,长江口口外海域的冬季海表温度也出现下降趋势。
Through the optimization of split-window algorithm, the sea surface temperature inversion model suitable for the Changjiang Estuary waters was established, and the sea surface temperature was retrieved by using the Terra-MODIS LIB clear sky data from 2000 to 2012. The 13-year sea surface temperature data of the Yangtze Estuary was obtained, The interannual and seasonal changes of the sea surface temperature in the estuary waters after the change of water and sediment into the estuary in the Yangtze River Basin are analyzed. The results show that the sea surface temperature in the Yangtze River estuary is mainly affected by solar radiation, and the spatial distribution of the temperature field shows a stepwise change from the mouth to the sea. Affected by upstream trend and runoff discharge, the sea surface temperature outside the mouth of the mouth showed different seasonal changes: in winter, the mouth is low in the mouth; in summer, the mouth is low and the mouth is high. Along with the increase of runoff into the estuary in the winter watershed, the winter sea surface temperature in the waters off the mouth of the Yangtze River also showed a downward trend.