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Title: Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations

Abstract

This study analyzes source apportioned methane (CH4) emissions and atmospheric mixing ratios in northern California during the Discover-AQ-CA field campaign using airborne measurement data and model simulations. Source apportioned CH4 emissions from the Emissions Database for Global Atmospheric Research (EDGAR) version 4.2 were applied in the 3-D chemical transport model GEOS-Chem and analyzed using airborne measurements taken as part of the Alpha Jet Atmospheric eXperiment over the San Francisco Bay Area (SFBA) and northern San Joaquin Valley (SJV). During the time period of the Discover-AQ-CA field campaign EDGAR inventory CH4 emissions were ~5.30 Gg day –1 (Gg = 1.0 × 109 g) (equating to ~1.90 × 103 Gg yr–1) for all of California. According to EDGAR, the SFBA and northern SJV region contributes ~30% of total CH4 emissions from California. Source apportionment analysis during this study shows that CH4 mixing ratios over this area of northern California are largely influenced by global emissions from wetlands and local/global emissions from gas and oil production and distribution, waste treatment processes, and livestock management. Model simulations, using EDGAR emissions, suggest that the model under-estimates CH4 mixing ratios in northern California (average normalized mean bias (NMB) = –5.2% and linear regression slope = 0.20).more » The largest negative biases in the model were calculated on days when large amounts of CH4 were measured over local emission sources and atmospheric CH4 mixing ratios reached values >2.5 parts per million. Sensitivity emission studies conducted during this research suggest that local emissions of CH4 from livestock management processes are likely the primary source of the negative model bias. These results indicate that a variety, and larger quantity, of measurement data needs to be obtained and additional research is necessary to better quantify source apportioned CH4 emissions in California.« less

Authors:
 [1];  [1];  [1];  [1]; ORCiD logo [2];  [3];  [4];  [4]
  1. NASA Ames Research Center, Moffett Field, CA (United States). Earth Sciences Div.
  2. NASA Ames Research Center, Moffett Field, CA (United States). Earth Sciences Div.; Carnegie Institution for Science, Stanford, CA (United States). Dept. of Global Ecology.
  3. Harvard Univ., Cambridge, MA (United States). Dept. of Earth and Planetary Sciences.
  4. Lawrence Berkeley National Lab., Berkeley, CA (United States). Environmental Energy Technologies Div.
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1212669
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Environment (1994)
Additional Journal Information:
Journal Name: Atmospheric Environment (1994); Journal Volume: 99; Journal Issue: C; Journal ID: ISSN 1352-2310
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; methane; source apportionment; emission inventory; livestock emissions

Citation Formats

Johnson, Matthew S., Yates, Emma L., Iraci, Laura T., Loewenstein, Max, Tadić, Jovan M., Wecht, Kevin J., Jeong, Seongeun, and Fischer, Marc L. Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations. United States: N. p., 2014. Web. doi:10.1016/j.atmosenv.2014.09.068.
Johnson, Matthew S., Yates, Emma L., Iraci, Laura T., Loewenstein, Max, Tadić, Jovan M., Wecht, Kevin J., Jeong, Seongeun, & Fischer, Marc L. Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations. United States. https://doi.org/10.1016/j.atmosenv.2014.09.068
Johnson, Matthew S., Yates, Emma L., Iraci, Laura T., Loewenstein, Max, Tadić, Jovan M., Wecht, Kevin J., Jeong, Seongeun, and Fischer, Marc L. Mon . "Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations". United States. https://doi.org/10.1016/j.atmosenv.2014.09.068. https://www.osti.gov/servlets/purl/1212669.
@article{osti_1212669,
title = {Analyzing source apportioned methane in northern California during Discover-AQ-CA using airborne measurements and model simulations},
author = {Johnson, Matthew S. and Yates, Emma L. and Iraci, Laura T. and Loewenstein, Max and Tadić, Jovan M. and Wecht, Kevin J. and Jeong, Seongeun and Fischer, Marc L.},
abstractNote = {This study analyzes source apportioned methane (CH4) emissions and atmospheric mixing ratios in northern California during the Discover-AQ-CA field campaign using airborne measurement data and model simulations. Source apportioned CH4 emissions from the Emissions Database for Global Atmospheric Research (EDGAR) version 4.2 were applied in the 3-D chemical transport model GEOS-Chem and analyzed using airborne measurements taken as part of the Alpha Jet Atmospheric eXperiment over the San Francisco Bay Area (SFBA) and northern San Joaquin Valley (SJV). During the time period of the Discover-AQ-CA field campaign EDGAR inventory CH4 emissions were ~5.30 Gg day –1 (Gg = 1.0 × 109 g) (equating to ~1.90 × 103 Gg yr–1) for all of California. According to EDGAR, the SFBA and northern SJV region contributes ~30% of total CH4 emissions from California. Source apportionment analysis during this study shows that CH4 mixing ratios over this area of northern California are largely influenced by global emissions from wetlands and local/global emissions from gas and oil production and distribution, waste treatment processes, and livestock management. Model simulations, using EDGAR emissions, suggest that the model under-estimates CH4 mixing ratios in northern California (average normalized mean bias (NMB) = –5.2% and linear regression slope = 0.20). The largest negative biases in the model were calculated on days when large amounts of CH4 were measured over local emission sources and atmospheric CH4 mixing ratios reached values >2.5 parts per million. Sensitivity emission studies conducted during this research suggest that local emissions of CH4 from livestock management processes are likely the primary source of the negative model bias. These results indicate that a variety, and larger quantity, of measurement data needs to be obtained and additional research is necessary to better quantify source apportioned CH4 emissions in California.},
doi = {10.1016/j.atmosenv.2014.09.068},
journal = {Atmospheric Environment (1994)},
number = C,
volume = 99,
place = {United States},
year = {Mon Dec 01 00:00:00 EST 2014},
month = {Mon Dec 01 00:00:00 EST 2014}
}

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Works referencing / citing this record:

Estimating methane emissions from biological and fossil-fuel sources in the San Francisco Bay Area: Methane Emissions in the SF Bay Area
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  • Jeong, Seongeun; Cui, Xinguang; Blake, Donald R.
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