On the cross-tropopause transport of water by tropical convective overshoots: A mesoscale modelling study constrained by in situ observations during the TRO-Pico field campaign in Brazil

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dc.contributor.authorBehera, Abhinna K.
dc.contributor.authorRivière, Emmanuel D.
dc.contributor.authorKhaykin, Sergey M.
dc.contributor.authorMarécal, Virginie
dc.contributor.authorGhysels, Mélanie
dc.contributor.authorBurgalat, Jérémie
dc.contributor.authorHeld, Gerhard [UNESP]
dc.contributor.institutionUFR Sciences Exactes et Naturelles
dc.contributor.institutionCNRS
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUMR 8518 - LOA - Laboratoire d'Optique Atmosphérique
dc.date.accessioned2022-04-29T08:38:48Z
dc.date.available2022-04-29T08:38:48Z
dc.date.issued2022-01-19
dc.description.abstractDeep convection overshooting the lowermost stratosphere is well known for its role in the local stratospheric water vapour (WV) budget. While it is seldom the case, local enhancement of WV associated with stratospheric overshoots is often published. Nevertheless, one debatable topic persists regarding the global impact of this event with respect to the temperature-driven dehydration of air parcels entering the stratosphere. As a first step, it is critical to quantify their role at a cloud-resolving scale before assessing their impact on a large scale in a climate model. It would lead to a nudging scheme for large-scale simulation of overshoots. This paper reports on the local enhancements of WV linked to stratospheric overshoots, observed during the TRO-Pico campaign conducted in March 2012 in Bauru, Brazil, using the BRAMS (Brazilian version of the Regional Atmospheric Modeling System; RAMS) mesoscale model. Since numerical simulations depend on the choice of several preferred parameters, each having its uncertainties, we vary the microphysics or the vertical resolution while simulating the overshoots. Thus, we produce a set of simulations illustrating the possible variations in representing the stratospheric overshoots. To better resolve the stratospheric hydration, we opt for simulations with the 800gm horizontal-grid-point presentation. Next, we validate these simulations against the Bauru S-band radar echo tops and the TRO-Pico balloon-borne observations of WV and particles. Two of the three simulations' setups yield results compatible with the TRO-Pico observations. From these two simulations, we determine approximately 333-2000gt of WV mass prevailing in the stratosphere due to an overshooting plume depending on the simulation setup. About 70g% of the ice mass remains between the 380 and 385gK isentropic levels. The overshooting top comprises pristine ice and snow, while aggregates only play a role just above the tropopause. Interestingly, the horizontal cross section of the overshooting top is about 450gkm2 at the 380gK isentrope, which is similar to the horizontal-grid-point resolution of a simulation that cannot compute overshoots explicitly. In a large-scale simulation, these findings could provide guidance for a nudging scheme of overshooting hydration or dehydration.en
dc.description.affiliationGSMA UMR CNRS 7331 UFR Sciences Exactes et Naturelles, CEDEX 2
dc.description.affiliationLATMOS/IPSL UVSQ Université Paris-Saclay UPMC University Paris 06 CNRS
dc.description.affiliationCentre National de Recherches Météorologiques Université de Toulouse,Météo-France CNRS
dc.description.affiliationInstituto de Pesquisas Meteorológicas (IPMet) Universidade Estadual Paulista (UNESP), Bauru
dc.description.affiliationUniv. Lille UMR 8518 - LOA - Laboratoire d'Optique Atmosphérique
dc.description.affiliationUnespInstituto de Pesquisas Meteorológicas (IPMet) Universidade Estadual Paulista (UNESP), Bauru
dc.format.extent881-901
dc.identifierhttp://dx.doi.org/10.5194/acp-22-881-2022
dc.identifier.citationAtmospheric Chemistry and Physics, v. 22, n. 2, p. 881-901, 2022.
dc.identifier.doi10.5194/acp-22-881-2022
dc.identifier.issn1680-7324
dc.identifier.issn1680-7316
dc.identifier.scopus2-s2.0-85123443707
dc.identifier.urihttp://hdl.handle.net/11449/230270
dc.language.isoeng
dc.relation.ispartofAtmospheric Chemistry and Physics
dc.sourceScopus
dc.titleOn the cross-tropopause transport of water by tropical convective overshoots: A mesoscale modelling study constrained by in situ observations during the TRO-Pico field campaign in Brazilen
dc.typeArtigo

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