 |
| Titel |
Aviation 2006 NOx-induced effects on atmospheric ozone and HOx in Community Earth System Model (CESM) |
| VerfasserIn |
A. Khodayari, S. Tilmes, S. C. Olsen, D. B. Phoenix, D. J. Wuebbles, J.-F. Lamarque, C.-C. Chen |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 18 ; Nr. 14, no. 18 (2014-09-19), S.9925-9939 |
| Datensatznummer |
250119050
|
| Publikation (Nr.) |
 copernicus.org/acp-14-9925-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| The interaction between atmospheric chemistry and ozone (O3) in the
upper troposphere–lower stratosphere (UTLS) presents a major uncertainty
in understanding the effects of aviation on climate. In this study, two
configurations of the atmospheric model from the Community Earth System
Model (CESM), Community Atmosphere Model with Chemistry,
Version 4 (CAM4) and Version 5 (CAM5), are used to evaluate the effects of aircraft
nitrogen oxide (NOx = NO + NO2) emissions on ozone and the background
chemistry in the UTLS. CAM4 and CAM5 simulations were both performed with
extensive tropospheric and stratospheric chemistry including 133 species and
330 photochemical reactions. CAM5 includes direct and indirect aerosol
effects on clouds using a modal aerosol module (MAM), whereby CAM4 uses a
bulk aerosol module, which can only simulate the direct effect. To examine
the accuracy of the aviation NOx-induced ozone distribution in the two
models, results from the CAM5 and CAM4 simulations are compared to
ozonesonde data. Aviation NOx emissions for 2006 were obtained from the AEDT
(Aviation Environmental Design Tool) global commercial aircraft emissions
inventory. Differences between simulated O3 concentrations and
ozonesonde measurements averaged at representative levels in the troposphere
and different regions are 13% in CAM5 and 18% in CAM4. Results show a
localized increase in aviation-induced O3 concentrations at aviation
cruise altitudes that stretches from 40° N to the North Pole. The
results indicate a greater and more disperse production of aviation
NOx-induced ozone in CAM5, with the annual tropospheric mean O3
perturbation of 1.2 ppb (2.4%) for CAM5 and 1.0 ppb (1.9%) for CAM4.
The annual mean O3 perturbation peaks at about 8.2 ppb (6.4%) and
8.8 ppb (5.2%) in CAM5 and CAM4, respectively. Aviation emissions also
result in increased hydroxyl radical (OH) concentrations and methane (CH4) loss rates,
reducing the tropospheric methane lifetime in CAM5 and CAM4 by 1.69 and
1.40%, respectively. Aviation NOx emissions are associated with an
instantaneous change in global mean short-term O3 radiative forcing
(RF) of 40.3 and 36.5 mWm−2 in CAM5 and CAM4, respectively. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|