 |
| Titel |
Modeling the transport of very short-lived substances into the tropical upper troposphere and lower stratosphere |
| VerfasserIn |
J. Aschmann, B.-M. Sinnhuber, E. L. Atlas, S. M. Schauffler |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 23 ; Nr. 9, no. 23 (2009-12-07), S.9237-9247 |
| Datensatznummer |
250007789
|
| Publikation (Nr.) |
 copernicus.org/acp-9-9237-2009.pdf |
|
|
|
|
|
| Zusammenfassung |
| The transport of very short-lived substances into the tropical
upper troposphere and lower stratosphere is investigated by a
three-dimensional chemical transport model using archived convective
updraft mass fluxes (or detrainment rates) from the European Centre for
Medium-Range Weather Forecast's ERA-Interim reanalysis. Large-scale
vertical velocities are calculated from diabatic heating rates. With this
approach we explicitly model the large scale subsidence in the tropical
troposphere with convection taking place in fast and isolated updraft
events. The model calculations agree generally well with observations of
bromoform and methyl iodide from aircraft campaigns and with ozone and
water vapor from sonde and satellite observations. Using a simplified
treatment of dehydration and bromine product gas washout we give a range of 1.6 to 3 ppt
for the contribution of bromoform to stratospheric bromine, assuming a uniform
mixing ratio in the boundary layer of 1 ppt. We show that
the most effective region for VSLS transport into the stratosphere is the
West Pacific, accounting for about 55% of the bromine from bromoform
transported into the stratosphere under the supposition of a uniformly distributed source. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|