Comparison of MODIS- and CALIPSO-Derived Temporal Aerosol Optical Depth over Yellow River Basin (China) from 2007 to 201
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ORIGINAL ARTICLE
Comparison of MODIS‑ and CALIPSO‑Derived Temporal Aerosol Optical Depth over Yellow River Basin (China) from 2007 to 2015 Ziyue Zhang1 · Miao Zhang1 · Muhammad Bilal2 · Bo Su1 · Chun Zhang1 · Liuna Guo1 Received: 19 August 2020 / Accepted: 8 September 2020 / Published online: 26 September 2020 © The Author(s) 2020
Abstract In this study, Collection 6.1 (C6.1) of different aerosol optical depth (AOD) products of different spatial resolutions were used from the aqua moderate resolution imaging spectroradiometer (MODIS) including dark target (DT), deep blue (DB), deep blue (DB), and DT-DB (DTB). These products were compared with cloud-aerosol lidar, and infrared pathfinder satellite observation (CALIPSO) AOD retrievals over the Yellow River Basin (YERB), China from 2003 to 2017. The YERB was divided into three sub-regions, namely Y ERB1 (the mountainous terrain in the upper reaches of the YERB), YERB2 (the Loess Plateau region in the middle reaches of the YERB), and Y ERB3 (the plain region downstream of the YERB). Errors and agreement between MODIS and CALIPSO data were reported using Pearson’s correlation (R) and relative mean bias (RMB). Results showed that the CALIPSO whole layers AOD (AODS) were better matched with MODIS AOD than the CALIPSO lowest layer AOD ( AOD1). The time series of AOD shows higher values in spring and summer, and a small difference in AOD products was observed in autumn. The overall average value of CALIPSO AOD and MODIS AOD both fitted the order: Y ERB3 > YERB2 > YERB1. The CALIPSO AOD retrievals have the best consistency with the DTB10K and the lowest consistency with DT3K. Overall, the regional distributions of the CALIPSO AOD and MODIS AOD are significantly different over the YERB, and the difference is closely related to the season, region, and topography. This study can help researchers understand the difference of aerosol temporal and spatial distribution utilizing different satellite products over YERB, and also can provide data and technical support for the government in atmospheric environmental governance over YERB. Keywords MODIS · CALIPSO · AOD · Yellow river basin
1 Introduction Atmospheric aerosols are solid and liquid particles with a size between 0.01 and 100 nm, which have complex physical, chemical, and optical characteristics (Nichol et al. 2020; Ziyue Zhang and Miao Zhang equally contributed to this study. * Miao Zhang [email protected] * Muhammad Bilal [email protected] 1
School of Environmental Science and Tourism, Nanyang Normal University, Wolong Road No.1638, Nanyang 473061, China
School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing 2100444, China
2
Tian et al. 2018). Aerosols have a considerable impact on climate, atmospheric environment quality, human health, and related matters (Ali et al. 2020; Kaiser and Granmar 2005; Kaufman et al. 2002; Kulmala et al. 2013; Lelieveld et al. 2015; Sun and Ariya 2006). Aerosols can scatter or absorb solar radiation, causing changes
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