12微米波段的影响：使用3通道火山灰算法比较GOES-11和GOES-12数据
The Effect of the 12-micrometer Band: Comparing GOES-11 and GOES-12 Data Using the 3-Channel Volcanic Ash Algorithm
摘要：
GOES-11上的12微米通道已被最新的地球同步卫星GOES-12上的13.3微米通道所取代。有人担心，这个13.3微米的通道在探测火山灰时不会那么准确。火山灰使用特殊的火山灰算法进行高亮显示，该算法是三个通道测量的亮温的算术组合，产生无单位的亮度计数，其值包括IR图像。预计云探测，特别是低云探测也会下降。红外数据从GOES-11和GOES-12的两个墨西哥火山，科利马和Popocatepetl，进行了分析。数据表明，一般来说，具有12微米波段的GOES-11火山灰算法为各种类型的云提供了更好的数据。它强调了12微米波段的重要性，并为这一领域的未来研究提供了空间。
英文摘要：
The 12-micrometer channel on GOES-11 has been replaced by the 13.3-micrometer channel on the latest geosynchronous satellite, GOES-12. There has been concern that this 13.3-micrometer channel will not be as accurate in detecting volcanic ash. Volcanic ash is highlighted using a special volcanic ash algorithm, an arithmetic combination of the brightness temperatures as measured by three channels, yielding a unitless brightness count whose values comprise an IR image. Degradation in cloud detection, especially low clouds, was also expected. IR data from GOES-11 and GOES-12 for two Mexican volcanoes, Colima and Popocatepetl, was analyzed. The data indicates that, in general, the GOES-11 volcanic ash algorithm with the 12-micrometer band provides much better data for various types of clouds. It emphasizes the importance of the 12-micrometer band and provides scope for future research in this area.
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