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The influence of water table depth and the free atmospheric state on convective rainfall predisposition

hal.structure.identifierDuke University [Durham]
dc.contributor.authorBONETTI, Sara
hal.structure.identifierDuke University [Durham]
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorMANOLI, Gabriele
hal.structure.identifierInteractions Sol Plante Atmosphère [UMR ISPA]
hal.structure.identifierDepartment of Forestry and Environmental Resources
dc.contributor.authorDOMEC, Jean-Christophe
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorPUTTI, Mario
hal.structure.identifierDuke University [Durham]
hal.structure.identifierUniversità degli Studi di Padova = University of Padua [Unipd]
dc.contributor.authorMARANI, Marco
hal.structure.identifierDuke University [Durham]
dc.contributor.authorKATUL, Gabriel G.
dc.date.accessioned2024-04-08T12:01:24Z
dc.date.available2024-04-08T12:01:24Z
dc.date.issued2015
dc.identifier.issn0043-1397
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/196153
dc.description.abstractEnA mechanistic model for the soil-plant system is coupled to a conventional slab representation of the atmospheric boundary layer (ABL) to explore the role of groundwater table (WT) variations and free atmospheric (FA) states on convective rainfall predisposition (CRP) at a Loblolly pine plantation site situated in the lower coastal plain of North Carolina. Predisposition is quantified using the crossing between modeled lifting condensation level (LCL) and convectively grown ABL depth. The LCL-ABL depth crossing is necessary for air saturation but not sufficient for cloud formation and subsequent convective rainfall occurrence. However, such crossing forms the main template for which all subsequent dynamical processes regulating the formation (or suppression) of convective rainfall operate on. If the feedback between surface fluxes and FA conditions is neglected, a reduction in latent heat flux associated with reduced WT levels is shown to enhance the ABL-LCL crossing probability. When the soil-plant system is fully coupled with ABL dynamics thereby allowing feedback with ABL temperature and humidity, FA states remain the leading control on CRP. However, vegetation water stress plays a role in controlling ABL-LCL crossing when the humidity supply by the FA is within an intermediate range of values. When FA humidity supply is low, cloud formation is suppressed independent of surface latent heat flux. Similarly, when FA moisture supply is high, cloud formation can occur independent of surface latent heat flux. In an intermediate regime of FA moisture supply, the surface latent heat flux controlled by soil water availability can supplement (or suppress) the necessary water vapor leading to reduced LCL and subsequent ABL-LCL crossing. It is shown that this intermediate state corresponds to FA values around the mode in observed humidity lapse rates (w) (between -2.5 x 10(-6) and -1.5 x 10(-6) kg kg(-1)m(-1)), suggesting that vegetation water uptake may be controlling CRP at the study site.
dc.language.isoen
dc.publisherAmerican Geophysical Union
dc.subjectrainfall
dc.subjectconvection
dc.subjecttranspiration
dc.subject.engroundwater
dc.subject.enoptimization theory
dc.title.enThe influence of water table depth and the free atmospheric state on convective rainfall predisposition
dc.typeArticle de revue
dc.identifier.doi10.1002/2014WR016431
dc.subject.halSciences de l'environnement/Milieux et Changements globaux
bordeaux.journalWater Resources Research
bordeaux.page2283-2297
bordeaux.volume51
bordeaux.hal.laboratoriesInteractions Soil Plant Atmosphere (ISPA) - UMR 1391*
bordeaux.issue4
bordeaux.institutionBordeaux Sciences Agro
bordeaux.institutionINRAE
bordeaux.peerReviewedoui
hal.identifierhal-02641392
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02641392v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Water%20Resources%20Research&rft.date=2015&rft.volume=51&rft.issue=4&rft.spage=2283-2297&rft.epage=2283-2297&rft.eissn=0043-1397&rft.issn=0043-1397&rft.au=BONETTI,%20Sara&MANOLI,%20Gabriele&DOMEC,%20Jean-Christophe&PUTTI,%20Mario&MARANI,%20Marco&rft.genre=article


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