气候变化领域集成服务门户(CCPortal): Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty

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DOI	10.5194/acp-21-3973-2021
	Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty
	Li L.; Mahowald N.M.; Miller R.L.; Pérez Garciá-Pando C.; Klose M.; Hamilton D.S.; Gonçalves Ageitos M.; Ginoux P.; Balkanski Y.; Green R.O.; Kalashnikova O.; Kok J.F.; Obiso V.; Paynter D.; Thompson D.R.
发表日期	2021
ISSN	1680-7316
起始页码	3973
结束页码	4005
卷号	21 期号:5
英文摘要	The large uncertainty in the mineral dust direct radiative effect (DRE) hinders projections of future climate change due to anthropogenic activity. Resolving modeled dust mineral speciation allows for spatially and temporally varying refractive indices consistent with dust aerosol composition. Here, for the first time, we quantify the range in dust DRE at the top of the atmosphere (TOA) due to current uncertainties in the surface soil mineralogical content using a dust mineral-resolving climate model. We propagate observed uncertainties in soil mineral abundances from two soil mineralogy atlases along with the optical properties of each mineral into the DRE and compare the resultant range with other sources of uncertainty across six climate models. The shortwave DRE responds region-specifically to the dust burden depending on the mineral speciation and underlying shortwave surface albedo: positively when the regionally averaged annual surface albedo is larger than 0.28 and negatively otherwise. Among all minerals examined, the shortwave TOA DRE and single scattering albedo at the 0.44- 0.63 μm band are most sensitive to the fractional contribution of iron oxides to the total dust composition. The global net (shortwave plus longwave) TOA DRE is estimated to be within -0.23 to C0.35Wm-2. Approximately 97% of this range relates to uncertainty in the soil abundance of iron oxides. Representing iron oxide with solely hematite optical properties leads to an overestimation of shortwave DRE by +0.10Wm-2at the TOA, as goethite is not as absorbing as hematite in the shortwave spectrum range. Our study highlights the importance of iron oxides to the shortwave DRE: they have a disproportionally large impact on climate considering their small atmospheric mineral mass fractional burden (~ 2 %). An improved description of iron oxides, such as those planned in the Earth Surface Mineral Dust Source Investigation (EMIT), is thus essential for more accurate estimates of the dust DRE. © 2021 Copernicus GmbH. All rights reserved.
语种	英语
scopus关键词	aerosol composition; climate modeling; iron oxide; mineral dust; mineralogy; radiative transfer; soil chemistry; top of atmosphere; uncertainty analysis
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/247059
作者单位	Department of Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, United States; NASA Goddard Institute for Space Studies, New York, NY, United States; Barcelona Supercomputing Center, Barcelona, Spain; Geophysical Fluid Dynamics Laboratory, Princeton, NJ, United States; Laboratoire des Sciences du Climat et de i'Environnement, UMR 8212 CEA-CNRS-UVSQ-UPSaclay, Gif-sur-Yvette CEDEX, France; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; ICREA, Catalan Institution for Research and Advances Studies, Barcelona, Spain; Institute of Meteorology and Climate Research (IMK-TRO), Department Troposphere Research, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Department of Project and Construction Engineering, Technical University of Catalonia, Terrassa, Spain
推荐引用方式 GB/T 7714	Li L.,Mahowald N.M.,Miller R.L.,et al. Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty[J],2021,21(5).
APA	Li L..,Mahowald N.M..,Miller R.L..,Pérez Garciá-Pando C..,Klose M..,...&Thompson D.R..(2021).Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	Li L.,et al."Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).