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| Titel |
Comparison of CMAM simulations of carbon monoxide (CO), nitrous oxide (N2O), and methane (CH4) with observations from Odin/SMR, ACE-FTS, and Aura/MLS |
| VerfasserIn |
J. J. Jin, K. Semeniuk, S. R. Beagley, V. I. Fomichev, A. I. Jonsson, J. C. McConnell, J. Urban, D. Murtagh, G. L. Manney, C. D. Boone, P. F. Bernath, K. A. Walker, B. Barret, P. Ricaud, E. Dupuy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 10 ; Nr. 9, no. 10 (2009-05-19), S.3233-3252 |
| Datensatznummer |
250007298
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| Publikation (Nr.) |
 copernicus.org/acp-9-3233-2009.pdf |
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| Zusammenfassung |
| Simulations of CO, N2O and CH4 from a coupled chemistry-climate
model (CMAM) are compared with satellite measurements from Odin
Sub-Millimeter Radiometer (Odin/SMR), Atmospheric Chemistry Experiment
Fourier Transform Spectrometer (ACE-FTS), and Aura Microwave Limb Sounder
(Aura/MLS). Pressure-latitude cross-sections and seasonal time series
demonstrate that CMAM reproduces the observed global CO, N2O, and
CH4 distributions quite well. Generally, excellent agreement with
measurements is found between CO simulations and observations in the
stratosphere and mesosphere. Differences between the simulations and the
ACE-FTS observations are generally within 30%, and the differences
between CMAM results and SMR and MLS observations are slightly larger. These
differences are comparable with the difference between the instruments in
the upper stratosphere and mesosphere. Comparisons of N2O show that
CMAM results are usually within 15% of the measurements in the lower and
middle stratosphere, and the observations are close to each other. However,
the standard version of CMAM has a low N2O bias in the upper
stratosphere. The CMAM CH4 distribution also reproduces the
observations in the lower stratosphere, but has a similar but smaller
negative bias in the upper stratosphere. The negative bias may be due to
that the gravity drag is not fully resolved in the model. The simulated
polar CO evolution in the Arctic and Antarctic agrees with the ACE and MLS
observations. CO measurements from 2006 show evidence of enhanced descent of
air from the mesosphere into the stratosphere in the Arctic after strong
stratospheric sudden warmings (SSWs). CMAM also shows strong descent of air
after SSWs. In the tropics, CMAM captures the annual oscillation in the
lower stratosphere and the semiannual oscillations at the stratopause and
mesopause seen in Aura/MLS CO and N2O observations and in Odin/SMR
N2O observations. The Odin/SMR and Aura/MLS N2O observations also
show a quasi-biennial oscillation (QBO) in the upper stratosphere, whereas,
the CMAM does not have QBO included. This study confirms that CMAM is able
to simulate middle atmospheric transport processes reasonably well. |
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