The brightness temperature adjusted dust index: An improved approach to detect dust storms using MODIS imagery

The brightness temperature adjusted dust index: An improved approach to detect dust storms using MODIS imagery
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亮度温度调节沙尘指数:使用 MODIS 图像检测沙尘暴的改进方法

DOI:
10.1016/j.jag.2016.12.016
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发表时间:
2017-05
影响因子:
7.5
通讯作者:
Zhang Qiaofeng
Zhang Qiaofeng
中科院分区:
地球科学1区
文献类型:
--
作者:
Yue Huanbi;He Chunyang;Zhao Yuanyuan;Ma Qun;Zhang Qiaofeng

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中分辨率成像光谱仪(MODIS)图像为沙尘暴的及时、准确监测提供了良好的数据源。然而,有效的基于MODIS的灰尘指数是不够的。本文提出了一种改进的亮温调整沙尘指数(BADI),它是将MODIS波段20(3.66-3.84 μm)、波段31(10.78-11.28 μm)和波段32(11.77-12.27 μm)的亮温进行积分得到的。利用BADI对2000 - 2011年东北亚地区几次典型沙尘暴进行了监测。与常用的基于MODIS的沙尘指数相比,如波段32和31的亮温差指数(BTD 32 -31)和归一化差异沙尘指数(NDI),BADI更准确地捕捉了沙尘暴的空间范围和密度。BADI对沙尘暴范围的探测精度大于90%,比BTD 32 - 31和NDDI的探测精度分别高7%和29%。BADI值与MODIS深蓝气溶胶光学厚度密度指标也有较好的一致性(R2= 0.59,P < 0.01)。我们认为,BADI是一个有效的工具,监测大尺度沙尘暴。
Moderate Resolution Imaging Spectroradiometer (MODIS) imagery provides a good data source for timely and accurate monitoring of dust storms. However, effective MODIS-based dust indices are inadequate. In this study, we proposed an improved brightness temperature adjusted dust index (BADI) by integrating the brightness temperatures of three thermal infrared MODIS bands: band20(3.66–3.84 μm), band31(10.78–11.28 μm) and band32(11.77–12.27 μm). We used the BADI to monitor several representative dust storms over the Northeast Asia between 2000 and 2011. When compared to commonly used MODIS-based dust indices, such as the brightness temperature difference index in band32and band31(BTD32-31) and the normalized difference dust index (NDDI), the BADI captured the spatial extent and density of dust storms more accurately. The BADI detected dust storm extent with an overall accuracy >90%, which was 7% and 29% higher than the results derived from BTD32-31and NDDI, respectively. The BADI also demonstrated good agreement with the density indicator of MODIS Deep Blue Aerosol Optical Depth (R2= 0.59, P < 0.01). We suggest that the BADI is an effective tool to monitor large-scale dust storms.
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