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dc.contributor.authorWang, Qiaoqiao
dc.contributor.authorJacob, Daniel James
dc.contributor.authorSpackman, J. Ryan
dc.contributor.authorPerring, Anne E.
dc.contributor.authorSchwarz, Joshua P.
dc.contributor.authorMoteki, Nobuhiro
dc.contributor.authorMarais, Eloise Ann
dc.contributor.authorGe, Cui
dc.contributor.authorWang, Jun
dc.contributor.authorBarrett, Steven R. H.
dc.date.accessioned2015-01-28T21:44:22Z
dc.date.issued2014
dc.identifier.citationWang, Qiaoqiao, Daniel James Jacob, J. Ryan Spackman, Anne E. Perring, Joshua P. Schwarz, Nobuhiro Moteki, Eloïse Ann Marais, Cui Ge, Jun Wang, and Steven R. H. Barrett. 2014. “Global Budget and Radiative Forcing of Black Carbon Aerosol: Constraints from Pole-to-Pole (HIPPO) Observations across the Pacific.” Journal of Geophysical Research: Atmospheres 119 (1): 195–206.en_US
dc.identifier.issn2169-897Xen_US
dc.identifier.issn2169-8996en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:13849017
dc.description.abstractWe use a global chemical transport model (GEOS-Chem) to interpret aircraft curtain observations of black carbon (BC) aerosol over the Pacific from 85°N to 67°S during the 2009–2011 HIAPER (High-Performance Instrumented Airborne Platform for Environmental Research) Pole-to-Pole Observations (HIPPO) campaigns. Observed concentrations are very low, implying much more efficient scavenging than is usually implemented in models. Our simulation with a global source of \(6.5 Tg a^{−1}\) and mean tropospheric lifetime of 4.2 days (versus 6.8 ± 1.8 days for the Aerosol Comparisons between Observations and Models (AeroCom) models) successfully simulates BC concentrations in source regions and continental outflow and captures the principal features of the HIPPO data but is still higher by a factor of 2 (1.48 for column loads) over the Pacific. It underestimates BC absorbing aerosol optical depths (AAODs) from the Aerosol Robotic Network by 32% on a global basis. Only 8.7% of global BC loading in GEOS-Chem is above 5 km, versus 21 ± 11% for the AeroCom models, with important implications for radiative forcing estimates. Our simulation yields a global BC burden of 77 Gg, a global mean BC AAOD of 0.0017, and a top-of-atmosphere direct radiative forcing (TOA DRF) of \(0.19 W m^{−2}\), with a range of \(0.17–0.31 W m^{−2}\) based on uncertainties in the BC atmospheric distribution. Our TOA DRF is lower than previous estimates \((0.27 \pm 0.06 W m^{−2}\) in AeroCom, \(0.65–0.9 W m^{−2}\) in more recent studies). We argue that these previous estimates are biased high because of excessive BC concentrations over the oceans and in the free troposphere.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherWiley-Blackwellen_US
dc.relation.isversionofdoi:10.1002/2013JD020824en_US
dash.licenseLAA
dc.subjectblack carbonen_US
dc.subjectaerosolen_US
dc.subjectabsorbing aerosol optical depthen_US
dc.subjectradiative forcingen_US
dc.subjectHIPPOen_US
dc.titleGlobal Budget and Radiative Forcing of Black Carbon Aerosol: Constraints from Pole-to-Pole (HIPPO) Observations across the Pacificen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalournal of Geophysical Research: Atmospheresen_US
dash.depositing.authorJacob, Daniel James
dc.date.available2015-01-28T21:44:22Z
dc.identifier.doi10.1002/2013JD020824*
workflow.legacycommentsPublisher permits deposit of published version after a 6-month embargo (see http://publications.agu.org/author-resource-center/usage-permissions/), which has passeden_US
dash.authorsorderedfalse
dash.contributor.affiliatedWang, Qiaoqiao
dash.contributor.affiliatedMarais, Elose
dash.contributor.affiliatedJacob, Daniel


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