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Sökning: id:"swepub:oai:research.chalmers.se:bb50fe2e-f2e4-4bbf-8393-8eb4142903f8" > Assessment of the i...

Assessment of the interannual variability and influence of the QBO and upwelling on tracer-tracer distributions of N2O and O3 in the tropical lower stratosphere

Khosrawi, F. (författare)
Stockholms universitet,Stockholm University
Muller, R. (författare)
Forschungszentrum Jülich GmbH
Urban, Joachim, 1964 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
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Proffitt, M. H. (författare)
Stiller, G. (författare)
Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
Kiefer, M. (författare)
Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
Lossow, S. (författare)
Karlsruher Institut für Technologie (KIT),Karlsruhe Institute of Technology (KIT)
Kinnison, D. (författare)
National Center for Atmospheric Research
Olschewski, F. (författare)
Bergische Universität Wuppertal
Riese, M. (författare)
Forschungszentrum Jülich GmbH
Murtagh, Donal, 1959 (författare)
Chalmers tekniska högskola,Chalmers University of Technology
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 (creator_code:org_t)
2013-04-02
2013
Engelska.
Ingår i: Atmospheric Chemistry and Physics. - : Copernicus GmbH. - 1680-7316 .- 1680-7324. ; 13:7, s. 3619-3641
Relaterad länk:
http://publications.... (primary) (free)
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https://doi.org/10.5...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • A modified form of tracer-tracer correlations of N2O and O-3 has been used as a tool for the evaluation of atmospheric photochemical models. Applying this method, monthly averages of N2O and O3 are derived for both hemispheres by partitioning the data into altitude (or potential temperature) bins and then averaging over a fixed interval of N2O. In a previous study, the method has been successfully applied to the evaluation of two chemical transport models (CTMs) and one chemistry-climate model (CCM) using a 1 yr climatology derived from the Odin Sub-Millimetre Radiometer (Odin/SMR). However, the applicability of a 1 yr climatology of monthly averages of N2O and O3 has been questioned due to the inability of some CCMs to simulate a specific year for the evaluation of CCMs. In this study, satellite measurements from Odin/SMR, the Aura Microwave Limb Sounder (Aura/MLS), the Michelson Interferometer for Passive Atmospheric Sounding on ENVISAT (ENVISAT/MIPAS), and the Cryogenic Infrared Spectrometers and Telescopes for the Atmosphere (CRISTA-1 and CRISTA-2) as well as model simulations from the Whole Atmosphere Community Climate Model (WACCM) are considered. By using seven to eight years of satellite measurements derived between 2003 and 2010 from Odin/SMR, Aura/MLS, ENVISAT/MIPAS and six years of model simulations from WACCM, the interannual variability of lower stratospheric monthly averages of N2O and O3 is assessed. It is shown that the interannual variability of the monthly averages of N2O and O3 is low, and thus can be easily distinguished from model deficiencies. Furthermore, it is investigated why large differences are found between Odin/SMR observations and model simulations from the Karlsruhe Simulation Model of the Middle Atmosphere (KASIMA) and the atmospheric general circulation model ECHAM5/Messy1 for the Northern and Southern Hemisphere tropics (0 degrees to 30 degrees N and 0 degrees to -30 degrees S, respectively). The differences between model simulations and observations are most likely caused by an underestimation of the quasi-biennial oscillation and tropical upwelling by the models as well as due to biases and/or instrument noise from the satellite instruments. A realistic consideration of the QBO in the model reduces the differences between model simulation and observations significantly. Finally, an intercomparison between Odin/SMR, Aura/MLS, ENVISAT/MIPAS and WACCM was performed. The comparison shows that these data sets are generally in good agreement, although some known biases of the data sets are clearly visible in the monthly averages. Nevertheless, the differences caused by the uncertainties of the satellite data sets are sufficiently small and can be clearly distinguished from model deficiencies. Thus, the method applied in this study is not only a valuable tool for model evaluation, but also for satellite data intercomparisons.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)

Nyckelord

tape-recorder
semiannual oscillation
atmosphere crista experiment
Odin/SMR
ozone profiles
quasi-biennial oscillation
water-vapor
in-situ observations
limb observations
cryogenic infrared spectrometers
source gas

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art (ämneskategori)
ref (ämneskategori)

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