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Quantifying the range of the dust direct radiative effect due to source mineralogy uncertainty

Li, Longlei; Mahowald, Natalie M.; Miller, Ron L.; Pérez García-Pando, Carlos; Klose, Martina; Hamilton, Douglas S.; Gonçalves Ageitos, Maria; Ginoux, Paul; Balkanski, Yves; Green, Robert O.; Kalashnikova, Olga; Kok, Jasper F.; Obiso, Vincenzo; Paynter, David; Thompson, David R.

Abstract:
The large uncertainty in the mineral dust directradiative effect (DRE) hinders projections of future climatechange due to anthropogenic activity. Resolving modeleddust mineral speciation allows for spatially and temporallyvarying refractive indices consistent with dust aerosol com-position. Here, for the first time, we quantify the range indust DRE at the top of the atmosphere (TOA) due to cur-rent uncertainties in the surface soil mineralogical contentusing a dust mineral-resolving climate model. We propagateobserved uncertainties in soil mineral abundances from twosoil mineralogy atlases along with the optical properties ofeach mineral into the DRE and compare the resultant rangewith other sources of uncertainty across six climate models.The shortwave DRE responds region-specifically to the dustburden depending on the mineral speciation and underlyingshortwave surface albedo: positively when the regionally av-eraged annual surface albedo is larger than 0.28 and nega-tively otherwise. Among all minerals examined, the short-wave TOA DRE and single scattering albedo at the 0.44–0.63 μm band are most sensitive to the fractional contribu-tion of iron oxides to the total dust composition. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000130770
Veröffentlicht am 19.03.2021
Originalveröffentlichung
DOI: 10.5194/acp-21-3973-2021
Scopus
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1680-7324
KITopen-ID: 1000130770
Erschienen in Atmospheric chemistry and physics
Verlag European Geosciences Union (EGU)
Band 21
Heft 5
Seiten 3973–4005
Vorab online veröffentlicht am 17.03.2021
Nachgewiesen in Scopus
Web of Science
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