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dc.contributor.authorSand, Maria
dc.contributor.authorSamset, Bjørn Hallvard
dc.contributor.authorMyhre, Gunnar
dc.contributor.authorGliss, Jonas
dc.contributor.authorBauer, Susanne E.
dc.contributor.authorBian, Huisheng
dc.contributor.authorChin, Mian
dc.contributor.authorCheca-Garcia, Ramiro
dc.contributor.authorGinoux, Paul
dc.contributor.authorKipling, Zak
dc.contributor.authorKirkevåg, Alf
dc.contributor.authorKokkola, Harri
dc.contributor.authorLe Sager, Philippe
dc.contributor.authorLund, Marianne Tronstad
dc.contributor.authorMatsui, Hitoshi
dc.contributor.authorVan Noije, Twan
dc.contributor.authorOliviè, Dirk Jan Leo
dc.contributor.authorRémy, Samuel
dc.contributor.authorSchulz, Michael
dc.contributor.authorStier, Philip
dc.contributor.authorStjern, Camilla Weum
dc.contributor.authorTakemura, Toshihiko
dc.contributor.authorTsigaridis, Kostas
dc.contributor.authorTsyro, Svetlana
dc.contributor.authorWatson-Parris, Duncan
dc.date.accessioned2022-01-31T13:32:54Z
dc.date.available2022-01-31T13:32:54Z
dc.date.created2021-12-06T06:00:26Z
dc.date.issued2021
dc.identifier.citationAtmospheric Chemistry and Physics (ACP). 2021, 21 (20), 15929-15947.en_US
dc.identifier.issn1680-7316
dc.identifier.urihttps://hdl.handle.net/11250/2976037
dc.description.abstractAerosol-induced absorption of shortwave radiation can modify the climate through local atmospheric heating, which affects lapse rates, precipitation, and cloud formation. Presently, the total amount of aerosol absorption is poorly constrained, and the main absorbing aerosol species (black carbon (BC), organic aerosols (OA), and mineral dust) are diversely quantified in global climate models. As part of the third phase of the Aerosol Comparisons between Observations and Models (AeroCom) intercomparison initiative (AeroCom phase III), we here document the distribution and magnitude of aerosol absorption in current global aerosol models and quantify the sources of intermodel spread, highlighting the difficulties of attributing absorption to different species. In total, 15 models have provided total present-day absorption at 550 nm (using year 2010 emissions), 11 of which have provided absorption per absorbing species. The multi-model global annual mean total absorption aerosol optical depth (AAOD) is 0.0054 (0.0020 to 0.0098; 550 nm), with the range given as the minimum and maximum model values. This is 28 % higher compared to the 0.0042 (0.0021 to 0.0076) multi-model mean in AeroCom phase II (using year 2000 emissions), but the difference is within 1 standard deviation, which, in this study, is 0.0023 (0.0019 in Phase II). Of the summed component AAOD, 60 % (range 36 %–84 %) is estimated to be due to BC, 31 % (12 %–49 %) is due to dust, and 11 % (0 %–24 %) is due to OA; however, the components are not independent in terms of their absorbing efficiency. In models with internal mixtures of absorbing aerosols, a major challenge is the lack of a common and simple method to attribute absorption to the different absorbing species. Therefore, when possible, the models with internally mixed aerosols in the present study have performed simulations using the same method for estimating absorption due to BC, OA, and dust, namely by removing it and comparing runs with and without the absorbing species. We discuss the challenges of attributing absorption to different species; we compare burden, refractive indices, and density; and we contrast models with internal mixing to models with external mixing. The model mean BC mass absorption coefficient (MAC) value is 10.1 (3.1 to 17.7) m2 g−1 (550 nm), and the model mean BC AAOD is 0.0030 (0.0007 to 0.0077). The difference in lifetime (and burden) in the models explains as much of the BC AAOD spread as the difference in BC MAC values. The difference in the spectral dependency between the models is striking. Several models have an absorption Ångstrøm exponent (AAE) close to 1, which likely is too low given current knowledge of spectral aerosol optical properties. Most models do not account for brown carbon and underestimate the spectral dependency for OA.en_US
dc.language.isoengen_US
dc.publisherCopernicus publicationsen_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleAerosol absorption in global models from AeroCom phase IIIen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionpublishedVersionen_US
dc.source.pagenumber15929-15947en_US
dc.source.volume21en_US
dc.source.journalAtmospheric Chemistry and Physics (ACP)en_US
dc.source.issue20en_US
dc.identifier.doi10.5194/acp-21-15929-2021
dc.identifier.cristin1964857
dc.relation.projectEC/H2020/641816en_US
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.qualitycode2


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