globalchange  > 气候减缓与适应
DOI: 10.1029/2018JD028851
Scopus记录号: 2-s2.0-85052459839
论文题名:
Methane Emissions From the Baltimore-Washington Area Based on Airborne Observations: Comparison to Emissions Inventories
作者: Ren X.; Salmon O.E.; Hansford J.R.; Ahn D.; Hall D.; Benish S.E.; Stratton P.R.; He H.; Sahu S.; Grimes C.; Heimburger A.M.F.; Martin C.R.; Cohen M.D.; Stunder B.; Salawitch R.J.; Ehrman S.H.; Shepson P.B.; Dickerson R.R.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:16
起始页码: 8869
结束页码: 8882
语种: 英语
英文关键词: airborne observations ; emissions ; inventories ; mass balance ; megacity ; methane
英文摘要: Urban areas are responsible for a substantial fraction of anthropogenic emissions of greenhouse gases (GHGs) including methane (CH4), with the second largest anthropogenic direct radiative forcing relative to carbon dioxide (CO2). Quantification of urban CH4 emissions is important for establishing GHG mitigation policies. Comparison of observation-based and inventory-based urban CH4 emissions suggests possible improvements in estimating CH4 source emissions in urban environments. In this study, we quantify CH4 emissions from the Baltimore-Washington area based on the mass balance aircraft flight experiments conducted in Winters 2015 and 2016. The field measurement-based mean winter CH4 emission rates from this area were 8.66 ± 4.17 kg/s in 2015 and 9.14 ± 4.49 kg/s in 2016, which are 2.8 times the 2012 average U.S. GHG Inventory-based emission rate. The observed emission rate is 1.7 times that given in a population-apportioned state of Maryland inventory. Methane emission rates inferred from carbon monoxide (CO) and CO2 emission inventories and observed CH4/CO and CH4/CO2 enhancement ratios are similar to those from the mass balance approach. The observed ethane-to-methane ratios, with a mean value of 3.3% in Winter 2015 and 4.3% in Winter 2016, indicate that the urban natural gas system could be responsible for ~40–60% of total CH4 emissions from this area. Landfills also appear to be a major contributor, providing 25 ± 15% of the total emissions for the region. Our study suggests there are grounds to reexamine the CH4 emissions estimates for the Baltimore-Washington area and to conduct flights in other seasons. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113237
Appears in Collections:气候减缓与适应

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作者单位: Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, United States; Air Resources Laboratory, National Oceanic and Atmospheric Administration, College Park, MD, United States; Cooperative Institute for Climate and Satellites, University of Maryland, College Park, MD, United States; Department of Chemistry, Purdue University, West Lafayette, IN, United States; Department of Computer Science, University of Maryland, College Park, MD, United States; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, United States; Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD, United States; Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, MD, United States; Now at College of Engineering, San José State University, San José, CA, United States; Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States

Recommended Citation:
Ren X.,Salmon O.E.,Hansford J.R.,et al. Methane Emissions From the Baltimore-Washington Area Based on Airborne Observations: Comparison to Emissions Inventories[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(16)
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