Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements

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dc.contributor.authorSong, Qianqian
dc.contributor.authorZhang, Zhibo
dc.contributor.authorYu, Hongbin
dc.contributor.authorKato, Seiji
dc.contributor.authorYang, Ping
dc.contributor.authorColarco, Peter
dc.contributor.authorRemer, Lorraine A.
dc.contributor.authorRyder, Claire L.
dc.date.accessioned2018-09-12T19:15:24Z
dc.date.available2018-09-12T19:15:24Z
dc.date.issued2018-08-13
dc.description.abstractIn this study, we integrate recent in situ measurements with satellite retrievals of dust physical and radiative properties to quantify dust direct radiative effects on shortwave (SW) and longwave (LW) radiation (denoted as DRE(SW) and DRE(LW), respectively) in the tropical North Atlantic during the summer months from 2007 to 2010. Through linear regression of the CERES-measured top-of-atmosphere (TOA) flux versus satellite aerosol optical depth (AOD) retrievals, we estimate the instantaneous DRE(SW) efficiency at the TOA to be −49.7±7.1Wm⁻²AOD⁻¹ and −36.5±4.8Wm⁻²AOD⁻¹ based on AOD from MODIS and CALIOP, respectively. We then perform various sensitivity studies based on recent measurements of dust particle size distribution (PSD), refractive index, and particle shape distribution to determine how the dust microphysical and optical properties affect DRE estimates and its agreement with the above-mentioned satellite-derived DREs. Our analysis shows that a good agreement with the observation-based estimates of instantaneous DRE(SW) and DRE(LW) can be achieved through a combination of recently observed PSD with substantial presence of coarse particles, a less absorptive SW refractive index, and spheroid shapes. Based on this optimal combination of dust physical properties we further estimate the diurnal mean dust DRE(SW) in the region of −10Wm⁻² at TOA and −26Wm⁻² at the surface, respectively, of which  ∼ 30% is canceled out by the positive DRE(LW). This yields a net DRE of about −6.9 and −18.3Wm⁻² at TOA and the surface, respectively. Our study suggests that the LW flux contains useful information on dust particle size, which could be used together with SW observations to achieve a more holistic understanding of the dust radiative effect.en_US
dc.description.sponsorshipZhibo Zhang is supported by the NASA TASNPP project. Qianqian Song is supported by a fellowship from the Joint Center for Earth Systems Technology of UMBC. Hongbin Yu was supported by the NASA Radiation Science Program managed by Hal Maring and the CALIPSO/CloudSat project managed by David Considine. Seiji Kato’s contribution to this research has been supported by the NASA CERES project. Peter Colarco’s work is supported by the NASA Atmospheric Composition Modeling and Analysis Program (ACMAP, 16-ACMAP16-0051, PI: Adriana Rocha Lima, program manager: Richard Eckman). Lorraine A. Remer would like to acknowledge support from NASA grants NNX15AD15G and NNX14AR21G for her participation in this project.en_US
dc.description.urihttps://www.atmos-chem-phys.net/18/11303/2018/en_US
dc.format.extent20 pagesen_US
dc.genrejournal articleen_US
dc.identifierdoi:10.13016/M2JS9HB90
dc.identifier.citationQianqian Song, Zhibo Zhang, Hongbin Yu , Seiji Kato , Ping Yang , Peter Colarco , Lorraine A. Remer , and Claire L. Ryder, Net radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurements, Atmospheric Chemistry and Physics Volume 18 issue 15, 2018, https://doi.org/10.5194/acp-18-11303-2018en_US
dc.identifier.urihttps://doi.org/10.5194/acp-18-11303-2018
dc.identifier.urihttp://hdl.handle.net/11603/11285
dc.language.isoen_USen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Physics Collection
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAttribution 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/us/*
dc.subjectaerosol optical depth (AOD)en_US
dc.subjectdust physical properties
dc.subjectdust radiative properties
dc.subjectdust effects on radiation
dc.subjectshortwave radiation
dc.subjectlongwave radiation
dc.subjectTropical North Atlantic
dc.subjectCERES-measured top-of-atmosphere (TOA) flux
dc.subjectinstantaneous DRESW efficiency
dc.subjectsensitivity studies
dc.subjectdust particle size distribution (PSD)
dc.subjectrefractive index
dc.subjectdust microphysical properties
dc.subjectdust optical properties
dc.titleNet radiative effects of dust in the tropical North Atlantic based on integrated satellite observations and in situ measurementsen_US
dc.typeTexten_US

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