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dc.contributor.authorKoch, Dorothy M.
dc.contributor.authorJacob, Daniel James
dc.contributor.authorGraustein, William C.
dc.date.accessioned2015-03-12T17:24:58Z
dc.date.issued1996
dc.identifier.citationKoch, Dorothy M., Daniel J. Jacob, and William C. Graustein. 1996. “Vertical Transport of Tropospheric Aerosols as Indicated by 7 Be and 210 Pb in a Chemical Tracer Model.” Journal of Geophysical Research 101 (D13): 18651. doi:10.1029/96jd01176.en_US
dc.identifier.issn0148-0227en_US
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:14121821
dc.description.abstractWe use the natural radionuclides 7Be and 210Pb as aerosol tracers in a three-dimensional chemical tracer model (based on the Goddard Institute for Space Studies general circulation model (GCM) 2) in order to study aerosol transport and removal in the troposphere. Beryllium 7, produced in the upper troposphere and stratosphere by cosmic rays, and 210Pb, a decay product of soil-derived 222Rn, are tracers of upper and lower tropospheric aerosols, respectively. Their source regions make them particularly suitable for the study of vertical transport processes. Both tracers are removed from the troposphere primarily by precipitation and are useful for testing scavenging parameterizations. In particular, model convection must properly transport and scavenge both ascending 210Pb and descending 7Be. The ratio 7Be/210Pb cancels most model errors associated with precipitation and serves as an indicator of vertical transport. We show that over land the annual average 7Be/210Pb ratio for surface concentrations and deposition fluxes vary little globally. In contrast, the seasonal variability of the 7Be/210Pb concentration ratio over continents is quite large; the ratio peaks in summer when convective activity is maximum. The model overestimates 7Be in the tropics, a problem which we relate to flaws in the GCM parameterization of wet convection (excessive convective mass fluxes and no allowance for entrainment). The residence time of tropospheric 7Be calculated by the model is 23 days, in contrast with a value of about 9 days calculated for 210Pb, reflecting the high-altitude versus low-altitude source regions of these two tracers.en_US
dc.description.sponsorshipEngineering and Applied Sciencesen_US
dc.language.isoen_USen_US
dc.publisherWiley-Blackwellen_US
dc.relation.isversionofdoi:10.1029/96JD01176en_US
dash.licenseLAA
dc.titleVertical transport of tropospheric aerosols as indicated by 7 Be and 210 Pb in a chemical tracer modelen_US
dc.typeJournal Articleen_US
dc.description.versionVersion of Recorden_US
dc.relation.journalJ. Geophys. Res.en_US
dash.depositing.authorJacob, Daniel James
dc.date.available2015-03-12T17:24:58Z
dc.identifier.doi10.1029/96JD01176*
workflow.legacycommentsCan post pub per sherpa (Publisher's version/PDF must be used in Institutional Repository 6 months after publication.)en_US
dash.contributor.affiliatedJacob, Daniel


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