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干旱半干旱沙尘爆发区风场信息作为沙尘监测的一个重要组成部分,能够为沙尘移向预报提供宝贵的资料。结合目前日趋成熟的红外分裂窗差值监测沙尘及卫星导风技术,针对FY-2E气象卫星,首先利用MODTRAN辐射传输模式对沙尘晴空区特征进行敏感性分析,再将经过图像掩膜及线性处理后的分裂窗差值图像代入导风计算程序计算,获得了传统卫星导风所无法得到的水汽含量低值区风场信息。实际个例分析表明,得到的沙尘区风场与NCEP再分析资料850hPa风场有很好的一致性,能够为监测沙尘移动提供良好的风场信息。
Wind farm information in arid and semi-arid sand dust outbreaks is an important component of dust monitoring and can provide valuable information for forecasting the movement of sand and dust. Combined with the current increasingly sophisticated infrared split-window differential monitoring dust and satellite guidance technology, for the FY-2E meteorological satellite, first using the MODTRAN radiation transmission mode to conduct a sensitivity analysis of the characteristics of dust-dusty sunny areas, and then through the image mask and The linearly processed split-window difference image was substituted into the wind-induced calculation program to obtain the wind field information of the low-moisture content region which can not be obtained by the traditional satellite-based wind guidance. The actual case analysis shows that the wind field obtained in the dust area is in good agreement with the 850 hPa wind field in the NCEP reanalysis data, which can provide good wind field information for monitoring dust movement.