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dc.contributor.authorAltaratz, O
dc.contributor.authorWollner, U
dc.contributor.authorKoren, I
dc.contributor.authorBar-Or, Rotem
dc.date.accessioned2013-12-23T13:32:13Z
dc.date.available2013-12-23T13:32:13Z
dc.date.issued2013-09
dc.date.submitted2013-06
dc.identifier.issn1748-9326
dc.identifier.urihttp://hdl.handle.net/1721.1/83182
dc.description.abstractThe hygroscopic growth of aerosols is controlled by the relative humidity (RH) and changes the aerosols' physical and hence optical properties. Observational studies of aerosol–cloud interactions evaluate the aerosol concentration using optical parameters, such as the aerosol optical depth (AOD), which can be affected by aerosol humidification. In this study we evaluate the RH background and variance values, in the lower cloudy atmosphere, an additional source of variance in AOD values beside the natural changes in aerosol concentration. In addition, we estimate the bias in RH and AOD, related to cloud thickness. This provides the much needed range of RH-related biases in studies of aerosol–cloud interaction. Twelve years of radiosonde measurements (June–August) in thirteen globally distributed stations are analyzed. The estimated non-biased AOD variance due to day-to-day changes in RH is found to be around 20% and the biases linked to cloud development around 10%. Such an effect is important and should be considered in direct and indirect aerosol effect estimations but it is inadequate to account for most of the AOD trend found in observational studies of aerosol–cloud interactions.en_US
dc.language.isoen_US
dc.publisherIOP Publishingen_US
dc.relation.isversionofhttp://dx.doi.org/10.1088/1748-9326/8/3/034025en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.sourceInstitute of Physicsen_US
dc.titleRelative humidity and its effect on aerosol optical depth in the vicinity of convective cloudsen_US
dc.typeArticleen_US
dc.identifier.citationAltaratz, O, R Z Bar-Or, U Wollner, and I Koren. “Relative humidity and its effect on aerosol optical depth in the vicinity of convective clouds.” Environmental Research Letters 8, no. 3 (September 1, 2013): 034025.en_US
dc.contributor.departmentMassachusetts Institute of Technology. Center for Global Change Scienceen_US
dc.contributor.mitauthorBar-Or, Rotemen_US
dc.relation.journalEnvironmental Research Lettersen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.orderedauthorsAltaratz, O; Bar-Or, R Z; Wollner, U; Koren, Ien_US
dc.identifier.orcidhttps://orcid.org/0000-0002-2880-4807
mit.licensePUBLISHER_CCen_US


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