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Flower trade-wind clouds are shallow mesoscale convective systems

Dauhut, Thibaut and Couvreux, Fleur and Bouniol, Dominique and Beucher, Florent and Volkmer, Lea and Pörtge, Veronika and Schäfer, Michael and Ayet, Alex and Brilouet, Pierre-Etienne and Jacob, Marek and Wirth, Martin (2022) Flower trade-wind clouds are shallow mesoscale convective systems. Quarterly Journal of the Royal Meteorological Society, 149 (750), pp. 325-347. Wiley. doi: 10.1002/qj.4409. ISSN 0035-9009.

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Official URL: https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.4409

Abstract

Flower clouds are trade-wind shallow cumuli, with tops reaching 3 km altitude, organised into 100-km wide clusters. They are widespread over the subtropics and associated with the strongest cloud radiative effect among trade-wind cumuli mesoscale organisations. In the context of large uncertainty in climate projections due to the representation of shallow clouds, major knowledge gaps remain about the global impact of mesoscale organisations and the local processes driving them. Here, the processes governing the flower organisation are investigated based on the case study of February 2, 2020 from the Elucidate the Couplings Between Clouds, Convection, and Circulation (EUREC A) campaign, east of Barbados. One flower cloud is simulated with a large-eddy simulation (LES), using the Meso-NH model at 100-m horizontal grid spacing, and validated extensively with high-resolution observations from the High Altitude and Long-range Research Aircraft (HALO), dropsondes, and satellite measurements. The cloud-top altitudes exhibit a trimodal distribution. The processes shaping flower clouds are wide cold pools and cloudy updrafts organised in one large arc at the western edge. These updrafts are responsible for the highest cloud tops and drive most of the vertical turbulent fluxes of sensible heat, humidity, and momentum. A mesoscale circulation takes place at the scale of the flower clouds and makes them very similar to deep mesoscale convective systems.

Item URL in elib:https://elib.dlr.de/193876/
Document Type:Article
Title:Flower trade-wind clouds are shallow mesoscale convective systems
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Dauhut, ThibautCNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, Francehttps://orcid.org/0000-0002-5468-3818UNSPECIFIED
Couvreux, FleurCNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, Francehttps://orcid.org/0000-0002-8440-3362UNSPECIFIED
Bouniol, DominiqueCNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, Francehttps://orcid.org/0000-0001-9020-1719UNSPECIFIED
Beucher, FlorentCNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, Francehttps://orcid.org/0000-0002-1631-2450UNSPECIFIED
Volkmer, LeaLMU München, München, GermanyUNSPECIFIEDUNSPECIFIED
Pörtge, VeronikaLMU München, München, Germanyhttps://orcid.org/0000-0001-9019-6294UNSPECIFIED
Schäfer, MichaelUniversität Leipzig, Leipig, Germanyhttps://orcid.org/0000-0003-1896-1574UNSPECIFIED
Ayet, AlexCNRS, Université Grenoble Alpes, Inria,Grenoble INP, GIPSA-Lab, Grenoble,Francehttps://orcid.org/0000-0002-4044-4488UNSPECIFIED
Brilouet, Pierre-EtienneCNRM, Université de Toulouse, Météo-France, CNRS, Toulouse, Francehttps://orcid.org/0000-0002-1551-4966UNSPECIFIED
Jacob, MarekResearch and Development, DeutscherWetterdienst (DWD), Offenbach, Germanyhttps://orcid.org/0000-0001-9059-6458UNSPECIFIED
Wirth, MartinDLR, IPAhttps://orcid.org/0000-0001-5951-2252UNSPECIFIED
Date:19 December 2022
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:149
DOI:10.1002/qj.4409
Page Range:pp. 325-347
Publisher:Wiley
ISSN:0035-9009
Status:Published
Keywords:Cloud physics, LES simulations, airborne measurements
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - LIDAR research and development
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Wirth, Dr.rer.nat. Martin
Deposited On:13 Feb 2023 07:54
Last Modified:13 Feb 2023 07:54

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