基于Himawari-8卫星的沙尘监测

Dust Monitoring with the Himawari-8 Satellite

Himawari-8卫星宽波段覆盖、高频次观测的特点可以在沙尘暴动态监测中发挥重要作用。基于Himawari-8卫星的可见光红外辐射计(advanced himawari image,AHI)的波段设计,通过对典型地物以及多类型沙尘光谱特性和多波段亮温差均值单倍标准差的分析,提出中红外和热红外通道亮度温度差值的组合阈值法进行沙尘遥感监测。运用多个区域多个时相的Himawari-8卫星数据开展了沙尘监测试验,使用臭氧探测仪(ozone monitoring instrument,OMI)监测的结果进行验证分析。结果表明,沙尘监测结果与臭氧监测仪监测的紫外气溶胶指数产品空间分布基本一致,可以达到较高的精度。

Himawari-8 satellite is characterized by wide-band coverage and high-frequency observations,which would play an important role in the monitoring of dust-storm dynamics.Based on the band design of advanced himawari imager（AHI）of Himawari-8 satellite,this paper analyzed the spectral characteristics and one standard deviation away from the means of brightness temperature differences of typical terrain and multi-type dust,and proposed a combined threshold method of temperature difference between infrared and thermal infrared channels for remote sensing dust monitoring.The dust monitoring test was conducted by using multi-temporal images of Himawari-8 satellite at multiple regions,and the results were validated by using ozone monitoring instrument（OMI）.The results show that with an agreement with OMI aerosol index（AI）dust products in spatial distribution,the proposed dust monitoring is able to achieve reasonable accuracy.