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| Titel |
The response of the equatorial tropospheric ozone to the Madden–Julian Oscillation in TES satellite observations and CAM-chem model simulation |
| VerfasserIn |
W. Sun, P. Hess, B. Tian |
| 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 ; 14, no. 21 ; Nr. 14, no. 21 (2014-11-11), S.11775-11790 |
| Datensatznummer |
250119147
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| Publikation (Nr.) |
 copernicus.org/acp-14-11775-2014.pdf |
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| Zusammenfassung |
| The Madden–Julian Oscillation (MJO) is the dominant form of the atmospheric
intra-seasonal oscillation, manifested by slow eastward movement (about
5 m s−1) of tropical deep convection. This study investigates the
MJO's impact on equatorial tropospheric ozone
(10° N–10° S) in satellite observations and chemical
transport model (CTM) simulations. For the satellite observations, we analyze
the Tropospheric Emission Spectrometer (TES) level-2 ozone profile data for
the period of January 2004 to June 2009. For the CTM simulations, we run the
Community Atmosphere Model with chemistry (CAM-chem) driven by the Goddard Earth Observing System Model, Version 5 (GEOS-5)-analyzed meteorological fields for the same data period as the TES
measurements. Our analysis indicates that the behavior of the total
tropospheric column (TTC) ozone at the intra-seasonal timescale is different
from that of the total column ozone, with the signal in the equatorial region
comparable with that in the subtropics. The model-simulated and satellite-measured ozone anomalies agree in their general pattern and amplitude when
examined in the vertical cross section (the average spatial correlation
coefficient among the eight phases is 0.63), with an eastward propagation
signature at a similar phase speed as the convective anomalies
(5 m s−1). The model ozone anomalies on the intra-seasonal timescale
are about 5 times larger when lightning emissions of NOx are
included in the simulation than when they are not. Nevertheless, large-scale
advection is the primary driving force for the ozone anomalies associated
with the MJO. The variability related to the MJO for ozone reaches up to 47% of the total variability (ranging from daily to interannual),
indicating that the MJO should be accounted for in simulating ozone perturbations
in the tropics. |
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