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Analysis of convective transport and parameter sensitivity in a single column version of the Goddard Earth Observation System, Version 5, General Circulation Model

Ott, L. and Bacmeister, J. and Pawson, S. and Pickering, K. and Stenchikov, G. and Suarez, M. and Huntrieser, H. and Loewenstein, M. and Lopez, J. and Xueref-Remy, I. (2009) Analysis of convective transport and parameter sensitivity in a single column version of the Goddard Earth Observation System, Version 5, General Circulation Model. Journal of the Atmospheric Sciences, 66, pp. 627-646. DOI: 10.1175/2008JAS2694.1.

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Abstract

Convection strongly influences the distribution of atmospheric trace gases. General circulation models (GCMs) use convective mass fluxes calculated by parameterizations to transport gases, but the results are difficult to compare with trace gas observations because of differences in scale. The high resolution of cloudresolving models (CRMs) facilitates direct comparison with aircraft observations. Averaged over a sufficient area, CRM results yield a validated product directly comparable to output from a single global model grid column. This study presents comparisons of vertical profiles of convective mass flux and trace gas mixing ratios derived from CRM and single column model (SCM) simulations of storms observed during three field campaigns. In all three cases, SCM simulations underpredicted convective mass flux relative to CRM imulations. As a result, the SCM simulations produced lower trace gas mixing ratios in the upper troposphere in two of the three storms than did the CRM simulations. The impact of parameter sensitivity in the moist physics schemes employed in the SCM has also been examined. Statistical techniques identified the most significant parameters influencing convective transport. Convective mass fluxes are shown to be strongly dependent on chosen parameter values. Results show that altered parameter settings can substantially improve the comparison between SCM and CRM convective mass flux. Upper tropospheric trace gas mixing ratios were also improved in two storms. In the remaining storm, the SCM representation of CO2 was not improved because of differences in entrainment and detrainment levels in the CRM and SCM simulations.

Document Type:Article
Title:Analysis of convective transport and parameter sensitivity in a single column version of the Goddard Earth Observation System, Version 5, General Circulation Model
Authors:
AuthorsInstitution or Email of Authors
Ott, L.NASA, Greenbelt, MD, USA
Bacmeister, J.Univ. of Maryland, USA
Pawson, S.NASA, Greenbelt, MD, USA
Pickering, K.NASA, Greenbelt, MD, USA
Stenchikov, G.The State Univ. of New Jersey, USA
Suarez, M.NASA, Greenbelt, MD, USA
Huntrieser, H.UNSPECIFIED
Loewenstein, M.NASA, CA, USA
Lopez, J.Bay Area Environmental Research Inst., CA, USA
Xueref-Remy, I.CNRS, Gif-sur-Yvette, F
Date:2009
Journal or Publication Title:Journal of the Atmospheric Sciences
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:66
DOI:10.1175/2008JAS2694.1
Page Range:pp. 627-646
Status:Published
Keywords:cloud-resolving model, thunderstorms, global circulation models
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 - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Heidi Huntrieser
Deposited On:21 Apr 2009
Last Modified:12 Dec 2013 20:37

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