This paper presents an improved algorithm, based on the D*-parameter, for dust detection over the East Asian region using brightness temperature differences (BTDs) between the infrared channels of the Advanced Himawari Imager (AHI) onboard Himawari-8. The developed algorithm defines a dust index in the form of the ratio of BTDs: BTD between the 10.4 μm and 12.4 μm channels (BTD_10.4–12.4) to that between the 8.6 μm and 10.4 μm channels (BTD_8.6–10.4). To identify dust with this index, threshold values were determined empirically. A masking technique using the BTD_8.6–10.4 was utilized in the dust index to mitigate the problem of detecting clear-sky deserts and fog over the ocean as dust. BTD_8.6–10.4 was analyzed for dust, clear-sky desert, and fog over the ocean cases during 2017 and 2018 with this method. Fog over the ocean and clear-sky desert were distinguished by the criteria of BTD_8.6–10.4 > −1.1 K and BTD_8.6–10.4 > −1 K, respectively. Based on these thresholds, the influence of fog over the ocean and clear-sky desert was filtered out. The results showed that the dust area was qualitatively consistent with RGB images and ground observation data. Comparison with the AERONET aerosol optical depth (AOD) demonstrated that the D*-parameter was exponentially proportional to AOD, and the correlation coefficient between them was approximately 0.6. The improved Asian Dust detection algorithm can be applied to the monitoring of dust dispersion and movement and also serve as a quantitative indicator of Asian Dust.

本文提出了一种基于D *参数的改进算法，用于使用Himawari-8机载高级Himawari成像仪（AHI）的红外通道之间的亮度温度差（BTD）对东亚地区的灰尘进行检测。所开发的算法以BTD的比率形式定义了粉尘指数：10.4μm和_12.4μm通道之间的BTD（BTD _10.4-12.4）与8.6μm和_10.4μm通道之间的BTD（BTD _8.6-10.4）。为了识别具有该指标的粉尘，根据经验确定阈值。在灰尘指数中使用了使用BTD _{8.6–10.4的}掩蔽技术，以减轻检测晴空沙漠和海洋上的雾气作为灰尘的问题。BTD _8.6–10.4使用此方法对2017年和2018年海洋案例中的灰尘，晴空沙漠和大雾进行了分析。BTD _8.6–10.4  > -1.1 K和BTD _8.6–10.4的标准区分了海洋和晴空沙漠上的_雾 > -1K。根据这些阈值，可以滤除雾对海洋和晴空沙漠的影响。结果表明，尘埃区域与RGB图像和地面观测数据在质量上一致。与AERONET气溶胶光学深度（AOD）的比较表明，D *参数与AOD成指数比例，并且它们之间的相关系数约为0.6。改进后的亚洲粉尘检测算法可以应用于粉尘的扩散和运动的监测，也可以作为亚洲粉尘的定量指标。