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Impact of the inflow moisture on the evolution of a warm conveyor belt

Schäfler, Andreas and Harnisch, Florian (2015) Impact of the inflow moisture on the evolution of a warm conveyor belt. Quarterly Journal of the Royal Meteorological Society, 141, pp. 299-310. Wiley. DOI: doi: 10.1002/qj.2360 ISSN 0035-9009

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.2360/abstract

Abstract

This case study of a warm conveyor belt (WCB) event that was probed on a research flight during the THORPEX (The Observing-System Research and Predictability Experiment) Pacific Asian Regional Campaign (T-PARC) field experiment in 2008, investigates the sensitivity of the forecast of the WCB, the associated cyclone and the downstream waveguide to the moisture content in the inflow region of the WCB. By assimilating water vapour profiles of a differential absorption lidar (DIAL) into the European Centre for Medium Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS), the inflow moisture in the analysis fields is adjusted and humidity is reduced in a broad region around the flight track. The initial reduction of moisture in the WCB inflow affects the latent heat release along the WCB, as well as the potential vorticity (PV) production at lower levels. This change led to a substantially lower outflow height of the forecasted WCB. Further, the height of the tropopause was reduced up to 20 hPa, which caused a change in the jet stream wind speeds of up to 15% downstream. Although the impact on the developing surface cyclone was small, improvements of the PV structure as well as of the kinetic energy could be identified.

Item URL in elib:https://elib.dlr.de/91813/
Document Type:Article
Title:Impact of the inflow moisture on the evolution of a warm conveyor belt
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schäfler, AndreasDLR, IPAUNSPECIFIED
Harnisch, FlorianLMU MünchenUNSPECIFIED
Date:2015
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:141
DOI :doi: 10.1002/qj.2360
Page Range:pp. 299-310
Publisher:Wiley
ISSN:0035-9009
Status:Published
Keywords:differential absorption lidar; data assimilation; water vapour; T-PARC
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, R - Vorhaben LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Schäfler, Andreas
Deposited On:12 Nov 2014 09:31
Last Modified:31 Jul 2019 19:49

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