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Finding the Missing Stratospheric BrY: a Global Modeling Study of Chbr3 and Ch2Br2 : Volume 9, Issue 6 (05/11/2009)

By Liang, Q.

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Book Id: WPLBN0003990482
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Finding the Missing Stratospheric BrY: a Global Modeling Study of Chbr3 and Ch2Br2 : Volume 9, Issue 6 (05/11/2009)  
Author: Liang, Q.
Volume: Vol. 9, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2009
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Stolarski, R. S., Douglass, A. R., Nielsen, J. E., Blake, D. R., Rodriguez, J. M., Kawa, S. R.,...Atlas, E. L. (2009). Finding the Missing Stratospheric BrY: a Global Modeling Study of Chbr3 and Ch2Br2 : Volume 9, Issue 6 (05/11/2009). Retrieved from http://worldebookfair.org/


Description
Description: NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Branch, Code 613.3, Greenbelt, MD 20771, USA. Recent in situ and satellite measurements suggest a contribution of ~5 pptv to stratospheric inorganic bromine from short-lived bromocarbons. We conduct a modeling study of the two most important short-lived bromocarbons, bromoform (CHBr3) and dibromomethane (CH2Br2), with the Goddard Earth Observing System Chemistry Climate Model (GEOS CCM) to account for this missing stratospheric bromine. We derive a top-down emission estimate of CHBr3 and CH2Br2 using airborne measurements in the Pacific and North American troposphere and lower stratosphere (LS) obtained during previous NASA aircraft campaigns. Our emission estimate suggests that to reproduce the observed concentrations in the free troposphere, a global oceanic emission of 425 Gg Br yr−1 for CHBr3 and 57 Gg Br yr−1 for CH2Br2 is needed, with 60% of emissions from open ocean and 40% from coastal regions. Although our simple emission scheme assumes no seasonal variations, the model reproduces the observed seasonal variations of the short-lived bromocarbons with high concentrations in winter and low concentrations in summer. This indicates that the seasonality of short-lived bromocarbons is largely due to seasonality in their chemical loss and transport. The inclusion of CHBr3 and CH2Br2 contributes ~5 pptv bromine throughout the stratosphere. Both the source gases and inorganic bromine produced from the source gas degradation (BryVSLS) in the troposphere are transported into the stratosphere, and are equally important. Inorganic bromine accounts for half (2.5 pptv) of the bromine from the inclusion of CHBr3 and CH2Br2 near the tropical tropopause and its contribution rapidly increases to ~100% as altitude increases. More than 85% of the wet scavenging of BryVSLS occurs in large-scale precipitation below 500 hPa and BryVSLS in the stratosphere is not sensitive to convection.

Summary
Finding the missing stratospheric Bry: a global modeling study of CHBr3 and CH2Br2

Excerpt
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