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Multimodel assessment of the upper troposphere and lower stratosphere: Extratropics

Hegglin, Michaela and Gettelman, Andrew and Hoor, P. and Krichevsky, R. and Manney, G.L. and Pan, L.L and Son, S.-W. and Stiller, G. and Tilmes, S. and Walker, K.A. and Eyring, V. and Shepherd, T.G. and Waugh, D. and Akiyoshi, H. and Añel, A.J. and Austin, J. and Baumgaertner, A. and Bekki, S. and Braesicke, P. and Brühl, C. and Butchart, N. and Chipperfield, M. and Dameris, M. and Dhomse, S. and Frith, S. and Garny, H. and Hardiman, S.C. and Jöckel, P. and Kinnison, D.E. and Lamarque, J.F. and Mancini, E. and Michou, M. and Morgenstern, O. and Nakamura, T. and Olivié, D. and Pawson, S. and Pitari, G. and Plummer, D.A. and Pyle, J.A. and Rozanov, E. and Scinocca, J.F. and Shibata, K. and Smale, D. and Teyssèdre, H. and Tian, W. and Yamashita, Y. (2010) Multimodel assessment of the upper troposphere and lower stratosphere: Extratropics. Journal of Geophysical Research, 115 (D00M09), pp. 1-24. DOI: 10.1029/2010JD013884.

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Official URL: http://www.agu.org/journals/jd/jd1020/2010JD013884/2010JD013884.pdf

Abstract

A multimodel assessment of the performance of chemistry�climate models (CCMs) in the extratropical upper troposphere/lower stratosphere (UTLS) is conducted for the first time. Process�oriented diagnostics are used to validate dynamical and transport characteristics of 18 CCMs using meteorological analyses and aircraft and satellite observations. The main dynamical and chemical climatological characteristics of the extratropical UTLS are generally well represented by the models, despite the limited horizontal and vertical resolution. The seasonal cycle of lowermost stratospheric mass is realistic, however with a wide spread in its mean value. A tropopause inversion layer is present in most models, although the maximum in static stability is located too high above the tropopause and is somewhat too weak, as expected from limited model resolution. Similar comments apply to the extratropical tropopause transition layer. The seasonality in lower stratospheric chemical tracers is consistent with the seasonality in the Brewer�Dobson circulation. Both vertical and meridional tracer gradients are of similar strength to those found in observations. Models that perform less well tend to use a semi�Lagrangian transport scheme and/or have a very low resolution. Two models, and the multimodel mean, score consistently well on all diagnostics, while seven other models score well on all diagnostics except the seasonal cycle of water vapor. Only four of the models are consistently below average. The lack of tropospheric chemistry in most models limits their evaluation in the upper troposphere. Finally, the UTLS is relatively sparsely sampled by observations, limiting our ability to quantitatively evaluate many aspects of model performance.

Document Type:Article
Title:Multimodel assessment of the upper troposphere and lower stratosphere: Extratropics
Authors:
AuthorsInstitution or Email of Authors
Hegglin, MichaelaUni Toronto, Toronto, Ontario, CND
Gettelman, AndrewNCAR, Boulder, CO, USA
Hoor, P.MPI für Chemie, Mainz
Krichevsky, R.Univ. of Toronto, Toronto, Ontario, CND
Manney, G.L.California Inst. of Technology, Pasadena, CA, USA
Pan, L.LNCAR, Boulder, CO, USA
Son, S.-W.McGill Univ., Montreal, Quebec, CND
Stiller, G.Inst. for Meteorology and Climate Research, Karlsruhe
Tilmes, S.NCAR, Boulder, CO, USA
Walker, K.A.Uni Toronto, Toronto, Ontario, CND
Eyring, V.DLR-PA
Shepherd, T.G.Uni Toronto, Toronto, Ontario, CND
Waugh, D.Johns Hopkins Univ., Baltimore, MD, USA
Akiyoshi, H.UNSPECIFIED
Añel, A.J.UNSPECIFIED
Austin, J.UNSPECIFIED
Baumgaertner, A.UNSPECIFIED
Bekki, S.UNSPECIFIED
Braesicke, P.UNSPECIFIED
Brühl, C.UNSPECIFIED
Butchart, N.UNSPECIFIED
Chipperfield, M.UNSPECIFIED
Dameris, M.DLR-PA
Dhomse, S.UNSPECIFIED
Frith, S.UNSPECIFIED
Garny, H.DLR-PA
Hardiman, S.C.UNSPECIFIED
Jöckel, P.UNSPECIFIED
Kinnison, D.E.UNSPECIFIED
Lamarque, J.F.UNSPECIFIED
Mancini, E.UNSPECIFIED
Michou, M.UNSPECIFIED
Morgenstern, O.UNSPECIFIED
Nakamura, T.UNSPECIFIED
Olivié, D.UNSPECIFIED
Pawson, S.UNSPECIFIED
Pitari, G.UNSPECIFIED
Plummer, D.A.UNSPECIFIED
Pyle, J.A.UNSPECIFIED
Rozanov, E.UNSPECIFIED
Scinocca, J.F.UNSPECIFIED
Shibata, K.UNSPECIFIED
Smale, D.UNSPECIFIED
Teyssèdre, H.UNSPECIFIED
Tian, W.UNSPECIFIED
Yamashita, Y.UNSPECIFIED
Date:2010
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:115
DOI:10.1029/2010JD013884
Page Range:pp. 1-24
Status:Published
Keywords:TTL, chemistry-climate models, CCMVal
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Prof. Dr. rer. nat. Martin Dameris
Deposited On:25 Oct 2010 17:18
Last Modified:23 Jan 2014 11:36

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