FORest Canopy Atmosphere Transfer (FORCAsT) 2.0: model updates and evaluation with observations at a mixed forest site

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dc.citation.firstpage6309en_US
dc.citation.issueNumber10en_US
dc.citation.journalTitleGeoscientific Model Developmenten_US
dc.citation.lastpage6329en_US
dc.citation.volumeNumber14en_US
dc.contributor.authorWei, Dandanen_US
dc.contributor.authorAlwe, Hariprasad D.en_US
dc.contributor.authorMillet, Dylan B.en_US
dc.contributor.authorBottorff, Brandonen_US
dc.contributor.authorLew, Michelleen_US
dc.contributor.authorStevens, Philip S.en_US
dc.contributor.authorShutter, Joshua D.en_US
dc.contributor.authorCox, Joshua L.en_US
dc.contributor.authorKeutsch, Frank N.en_US
dc.contributor.authorShi, Qianwenen_US
dc.contributor.authorKavassalis, Sarah C.en_US
dc.contributor.authorMurphy, Jennifer G.en_US
dc.contributor.authorVasquez, Krystal T.en_US
dc.contributor.authorAllen, Hannah M.en_US
dc.contributor.authorPraske, Ericen_US
dc.contributor.authorCrounse, John D.en_US
dc.contributor.authorWennberg, Paul O.en_US
dc.contributor.authorShepson, Paul B.en_US
dc.contributor.authorBui, Alexander A.T.en_US
dc.contributor.authorWallace, Henry W.en_US
dc.contributor.authorGriffin, Robert J.en_US
dc.contributor.authorMay, Nathaniel W.en_US
dc.contributor.authorConnor, Meganen_US
dc.contributor.authorSlade, Jonathan H.en_US
dc.contributor.authorPratt, Kerri A.en_US
dc.contributor.authorWood, Ezra C.en_US
dc.contributor.authorRollings, Mathewen_US
dc.contributor.authorDeming, Benjamin L.en_US
dc.contributor.authorAnderson, Daniel C.en_US
dc.contributor.authorSteiner, Allison L.en_US
dc.date.accessioned2021-11-11T19:30:25Zen_US
dc.date.available2021-11-11T19:30:25Zen_US
dc.date.issued2021en_US
dc.description.abstractThe FORCAsT (FORest Canopy Atmosphere Transfer) model version 1.0 is updated to FORCAsT 2.0 by implementing five major changes, including (1) a change to the operator splitting, separating chemistry from emission and dry deposition, which reduces the run time of the gas-phase chemistry by 70 % and produces a more realistic in-canopy profile for isoprene; (2) a modification of the eddy diffusivity parameterization to produce greater and more realistic vertical mixing in the boundary layer, which ameliorates the unrealistic simulated end-of-day peaks in isoprene under well-mixed conditions and improves daytime air temperature; (3) updates to dry deposition velocities with available measurements; (4) implementation of the Reduced Caltech Isoprene Mechanism (RCIM) to reflect the current knowledge of isoprene oxidation; and (5) extension of the aerosol module to include isoprene-derived secondary organic aerosol (iSOA) formation. Along with the operator splitting, modified vertical mixing, and dry deposition, RCIM improves the estimation of first-generation isoprene oxidation products (methyl vinyl ketone and methacrolein) and some second-generation products (such as isoprene epoxydiols). Inclusion of isoprene in the aerosol module in FORCAsT 2.0 leads to a 7 % mass yield of iSOA. The most important iSOA precursors are IEPOX and tetrafunctionals, which together account for >86 % of total iSOA. The iSOA formed from organic nitrates is more important in the canopy, accounting for 11 % of the total iSOA. The tetrafunctionals compose up to 23 % of the total iSOA formation, highlighting the importance of the fate (i.e., dry deposition and gas-phase chemistry) of later-generation isoprene oxidation products in estimating iSOA formation.en_US
dc.identifier.citationWei, Dandan, Alwe, Hariprasad D., Millet, Dylan B., et al.. "FORest Canopy Atmosphere Transfer (FORCAsT) 2.0: model updates and evaluation with observations at a mixed forest site." <i>Geoscientific Model Development,</i> 14, no. 10 (2021) European Geosciences Union: 6309-6329. https://doi.org/10.5194/gmd-14-6309-2021.en_US
dc.identifier.digitalgmd-14-6309-2021en_US
dc.identifier.doihttps://doi.org/10.5194/gmd-14-6309-2021en_US
dc.identifier.urihttps://hdl.handle.net/1911/111654en_US
dc.language.isoengen_US
dc.publisherEuropean Geosciences Unionen_US
dc.rightsThis work is distributed under the Creative Commons Attribution 4.0 License.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.titleFORest Canopy Atmosphere Transfer (FORCAsT) 2.0: model updates and evaluation with observations at a mixed forest siteen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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