像素扭曲与有效对流观测范围

Pixel Distortion and Convective-Scale-Appropriate Observing Domain

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作者：

诸葛小勇南京大学中尺度灾害性天气教育部重点实验室南京 210023
邹晓蕾美国马里兰大学地球系统多学科中心美国 xzou1@umd.edu
王元南京大学中尺度灾害性天气教育部重点实验室南京 210023

中文摘要：

像素扭曲反映卫星图像上的像素点面积和形状随地面位置的变化。像素扭曲值、星下点位置和分辨率决定卫星探测对流尺度天气现象的能力。对于位于105°E、星下点分辨率为2km的静止卫星成像仪，它的有效对流观测范围可覆盖几乎整个中国区域。

中文关键词：

像素扭曲，有效对流观测范围，静止气象卫星

KeyWords：

pixel distortion, convective-scale-appropriate observing domain, geostationary meteorological satellite

Abstract：

Pixel distortion reflects a change of the area and shape of the pixel observed by a geostationary imager with the location of the earth. The ability of detecting convective-scale weather phenomenon is determined by the pixel distortion, the location of the sub-satellite point and the pixel size at the sub-satellite point. If a geostationary meteorological satellite is positioned at 105°E with a 2-km sub-satellite resolution, its convective-scale-appropriate observing domain may cover almost the entire China.