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Convective activity in an extratropical cyclone and its warm conveyor belt - a case-study combining observations and a convection-permitting model simulation

Oertel, Annika and Boettcher, Maxi and Joos, Hanna and Sprenger, Michael and Konow, Heike and Hagen, Martin and Wernli, Heini (2019) Convective activity in an extratropical cyclone and its warm conveyor belt - a case-study combining observations and a convection-permitting model simulation. Quarterly Journal of the Royal Meteorological Society, pp. 1406-1426. Wiley. DOI: 10.1002/qj.3500 ISSN 0035-9009

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Official URL: https://rmets.onlinelibrary.wiley.com/doi/10.1002/qj.3500

Abstract

Warm conveyor belts (WCBs) are important Lagrangian features in extratropical cyclones for the evolution of clouds, precipitation and flow dynamics. According to the classical concept, WCBs rise continuously from the boundary layer to the upper troposphere with ascent rates of less than 50 hPa/hr. Recent studies identified embedded convection in WCBs with ascent rates exceeding 50 hPa/hr, however, its significance and characteristics have not yet been analysed systematically. This study presents a detailed analysis of a frontal wave cyclone that occurred during the North Atlantic Waveguide and Downstream Impact Experiment (NAWDEX) and investigates the occurrence of convection with ascent rates exceeding 100-200 hPa/hr embedded in the WCB. A set of diagnostics, based on the combination of Meteosat products, ECMWF data, and a convection-permitting simulation, reveals consistently that convection occurs frequently in the warm sector of the investigated cyclone, in particular in the region of the WCB. These convective regions are characterized by increased surface precipitation, low values of convective available potential energy, and significant large-scale forcing for ascent, indicating that this type of convection embedded in WCBs differs from classical air mass convection with higher vertical velocities. This is qualitatively confirmed by airborne radar observations of the considered cyclone with reflectivities hardly exceeding 30 dBZ. In the investigated WCB, the ascent is not continuous, but characterized by intermittent periods of very strong or even convective ascent and occasionally by short periods of descent. Together, these results provide a refined view on the concept of WCBs and its embedded convection.

Item URL in elib:https://elib.dlr.de/127206/
Document Type:Article
Title:Convective activity in an extratropical cyclone and its warm conveyor belt - a case-study combining observations and a convection-permitting model simulation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Oertel, AnnikaIAC, ETH Zürich, SchweizUNSPECIFIED
Boettcher, MaxiIAC, ETH Zürich, SchweizUNSPECIFIED
Joos, HannaIAC, ETH Zürich, Schweizhttps://orcid.org/0000-0001-8090-4218
Sprenger, MichaelIAC, ETH Zürich, SchweizUNSPECIFIED
Konow, HeikeMeteorol. Institut, Univ. HamburgUNSPECIFIED
Hagen, MartinDLR, IPAhttps://orcid.org/0000-0003-4714-0775
Wernli, HeiniIAC, ETH Zürich, Schweizhttps://orcid.org/0000-0001-9674-4837
Date:April 2019
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
DOI :10.1002/qj.3500
Page Range:pp. 1406-1426
Publisher:Wiley
ISSN:0035-9009
Status:Published
Keywords:convection; convection-permitting simulation; extratropical cyclone; NAWDEX; satellite observations; trajectories; warm conveyor belt
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Hagen, Dr.rer.nat. Martin
Deposited On:14 Jun 2019 13:58
Last Modified:17 Jun 2019 11:47

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