气候变化领域集成服务门户(CCPortal): Global dust optical depth climatology derived from CALIOP and MODIS aerosol retrievals on decadal timescales: Regional and interannual variability

CCPortal

DOI	10.5194/acp-21-13369-2021
	Global dust optical depth climatology derived from CALIOP and MODIS aerosol retrievals on decadal timescales: Regional and interannual variability
	Song Q.; Zhang Z.; Yu H.; Ginoux P.; Shen J.
发表日期	2021
ISSN	1680-7316
起始页码	13369
结束页码	13395
卷号	21 期号:17
英文摘要	We derived two observation-based global monthly mean dust aerosol optical depth (DAOD) climatological datasets from 2007 to 2019 with a 2g (latitude)g×g5g (longitude) spatial resolution, one based on Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) and the other on Moderate Resolution Imaging Spectroradiometer (MODIS) observations. In addition, the CALIOP climatological dataset also includes dust vertical extinction profiles. Dust is distinguished from non-dust aerosols based on particle shape information (e.g., lidar depolarization ratio) for CALIOP and on dust size and absorption information (e.g., fine-mode fraction, Ångström exponent, and single-scattering albedo) for MODIS, respectively. The two datasets compare reasonably well with the results reported in previous studies and the collocated Aerosol Robotic Network (AERONET) coarse-mode AOD. Based on these two datasets, we carried out a comprehensive comparative study of the spatial and temporal climatology of dust. On a multi-year average basis, the global (60ggS-60ggN) annual mean DAOD is 0.032 and 0.067 according to CALIOP and MODIS retrievals, respectively. In most dust-active regions, CALIOP DAOD generally correlates well (correlation coefficient R>0.6) with the MODIS DAOD, although the CALIOP value is significantly smaller. The CALIOP DAOD is 18g%, 34g%, 54g%, and 31g% smaller than MODIS DAOD over the Sahara, the tropical Atlantic Ocean, the Caribbean Sea, and the Arabian Sea, respectively. Applying a regional specific lidar ratio (LR) of 58gsr instead of the 44gsr used in the CALIOP operational retrieval reduces the difference from 18g% to 8g% over the Sahara and from 34g% to 12g% over the tropical Atlantic Ocean. However, over eastern Asia and the northwestern Pacific Ocean (NWP), the two datasets show weak correlation. Despite these discrepancies, CALIOP and MODIS show similar seasonal and interannual variations in regional DAOD. For dust aerosol over the NWP, both CALIOP and MODIS show a declining trend of DAOD at a rate of about 2g%gyr-1. This decreasing trend is consistent with the observed declining trend of DAOD in the southern Gobi Desert at a rate of 3g%gyr-1 and 5g%gyr-1 according to CALIOP and MODIS, respectively. The decreasing trend of DAOD in the southern Gobi Desert is in turn found to be significantly correlated with increasing vegetation and decreasing surface wind speed in the area. © Copyright:
语种	英语
scopus关键词	aerosol; annual variation; CALIOP; concentration (composition); decadal variation; dust; MODIS; optical depth; Arabian Sea; Atlantic Ocean; Caribbean Sea; Indian Ocean; Sahara
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246596
作者单位	Physics Department, UMBC, Baltimore, MD, United States; Joint Center of Earth Systems Technology, UMBC, Baltimore, MD, United States; Earth Sciences Division, NASA Goddard Space Flight Center, Greenbelt, MD, United States; NOAA Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; College of Computer, Mathematical, and Natural Sciences, University of Maryland, College Park, MD, United States
推荐引用方式 GB/T 7714	Song Q.,Zhang Z.,Yu H.,et al. Global dust optical depth climatology derived from CALIOP and MODIS aerosol retrievals on decadal timescales: Regional and interannual variability[J],2021,21(17).
APA	Song Q.,Zhang Z.,Yu H.,Ginoux P.,&Shen J..(2021).Global dust optical depth climatology derived from CALIOP and MODIS aerosol retrievals on decadal timescales: Regional and interannual variability.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(17).
MLA	Song Q.,et al."Global dust optical depth climatology derived from CALIOP and MODIS aerosol retrievals on decadal timescales: Regional and interannual variability".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.17(2021).