Constraints on Asian and European sources of methane from CH 4 -C 2 H 6 -CO correlations in Asian outflow

DSpace/Manakin Repository

Constraints on Asian and European sources of methane from CH 4 -C 2 H 6 -CO correlations in Asian outflow

Citable link to this page

 

 
Title: Constraints on Asian and European sources of methane from CH 4 -C 2 H 6 -CO correlations in Asian outflow
Author: Xiao, Yaping; Jacob, Daniel James; Wang, James; Logan, Jennifer A.; Palmer, Paul; Suntharalingam, Parvadha; Yantosca, Robert M.; Sachse, Glen; Blake, Donald; Streets, David

Note: Order does not necessarily reflect citation order of authors.

Citation: Xiao, Yaping, Daniel J. Jacob, James S. Wang, Jennifer A. Logan, Paul I. Palmer, Parvadha Suntharalingam, Robert M. Yantosca, Glen W. Sachse, Donald R. Blake, and David G. Streets. 2004. “Constraints on Asian and European Sources of Methane from CH 4 -C 2 H 6 -CO Correlations in Asian Outflow.” Journal of Geophysical Research 109, issue D15.
Full Text & Related Files:
Abstract: Aircraft observations of Asian outflow from the Transport and Chemical Evolution Over the Pacific (TRACE-P) aircraft mission over the NW Pacific (March and April 2001) show large CH4 enhancements relative to background, as well as strong CH4-C2H6-CO correlations that provide signatures of regional sources. We apply a global chemical transport model simulation of the CH4-C2H6-CO system for the TRACE-P period to interpret these observations in terms of CH4 sources and to explore in particular the unique constraints from the CH4-C2H6-CO correlations. We use as a priori a global CH4 source inventory constrained with National Oceanic and Atmospheric Administration (NOAA) Climate Monitoring and Diagnostics Laboratory (CMDL) surface observations [Wang et al., 2004]. We find that the observed CH4 concentration enhancements and CH4-C2H6-CO correlations in Asian outflow in TRACE-P are determined mainly by anthropogenic emissions from China and Eurasia (defined here as Europe and eastern Russia), with only little contribution from tropical sources (wetlands and biomass burning). The a priori inventory overestimates the observed CH4 enhancements and shows regionally variable biases for the CH4/C2H6 slope. The CH4/CO slopes are simulated without significant bias. Matching both the observed CH4 enhancements and the CH4-C2H6-CO slopes in Asian outflow requires increasing the east Asian anthropogenic source of CH4, and decreasing the Eurasian anthropogenic source, by at least 30% for both. The need to increase the east Asian source is driven by the underestimate of the CH4/C2H6 slope in boundary layer Chinese outflow. The Streets et al. [2003] anthropogenic emission inventory for east Asia fits this constraint by increasing CH4 emissions from that region by 40% relative to the a priori, largely because of higher livestock and landfill source estimates. Eurasian sources (mostly European) then need to be reduced by 30–50% from the a priori value of 68 Tg yr−1. The decrease of European sources could result in part from recent mitigation of emissions from coal mining and landfills.
Published Version: doi:10.1029/2003JD004475
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:14117724
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters