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Sensitivity of quantitative precipitation forecast to height dependent changes in humidity

Keil, Christian and Röpnack, Andreas and Craig, George C. and Schumann, Ulrich (2008) Sensitivity of quantitative precipitation forecast to height dependent changes in humidity. Geophysical Research Letters, 35 (L09812), pp. 1-5. DOI: 10.1029/2008GL033657.

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Official URL: http://www.agu.org/journals/gl/

Abstract

The impact of humidity variations on QPF is studied performing a series of sensitivity experiments with the COSMO model at a horizontal mesh size of 7 km. Generally, variations of humidity in the boundary layer have the largest impact on precipitation, and the sensitivity decreases with height. An increase of humidity by 10% in the boundary layer is equivalent to an increase of 20% in the mid-troposphere. While the impact of humidity variation on stratiform precipitation persists throughout the 36-h forecast period, the impact diminishes after 24 h in the convective rainfall area. Increasing the boundary layer humidity by 30% leads to a 6 h earlier initiation of convection and a five times larger precipitation amount in the convective area, whereas it is doubled in the stratiform region. These results indicate that accurate measurements of humidity in the boundary layer are most important for QPF.

Document Type:Article
Title:Sensitivity of quantitative precipitation forecast to height dependent changes in humidity
Authors:
AuthorsInstitution or Email of Authors
Keil, ChristianUNSPECIFIED
Röpnack, AndreasDWD
Craig, George C.UNSPECIFIED
Schumann, UlrichUNSPECIFIED
Date:2008
Journal or Publication Title:Geophysical Research Letters
Volume:35
DOI:10.1029/2008GL033657
Page Range:pp. 1-5
Status:Published
Keywords:mesoscale modeling, humidity variation, COSMO, QPF, Lidar
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Air Traffic and Weather (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Cloud Physics and Traffic Meteorology
Deposited By: Jana Freund
Deposited On:05 Jun 2008
Last Modified:12 Dec 2013 20:31

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