气候变化领域集成服务门户(CCPortal): Estimating nitrous oxide (N2O) emissions for the Los Angeles Megacity using mountaintop remote sensing observations

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DOI	10.1016/j.rse.2021.112351
	Estimating nitrous oxide (N2O) emissions for the Los Angeles Megacity using mountaintop remote sensing observations
	Addington O.; Zeng Z.-C.; Pongetti T.; Shia R.-L.; Gurney K.R.; Liang J.; Roest G.; He L.; Yung Y.L.; Sander S.P.
发表日期	2021
ISSN	00344257
卷号	259
英文摘要	Nitrous oxide (N2O) is an important greenhouse gas contributing both to global radiative forcing and ozone depletion. Though N2O emissions are largely derived from agricultural activities, urban sources of N2O also contribute significantly to anthropogenic emissions, but are not well understood and difficult to quantify. This study employs a top-down approach to derive urban N2O emissions for the Los Angeles megacity using a unique dataset from a mountaintop remote sensing instrument, which has been observing greenhouse gas mixing ratios in LA since 2011. CLARS-FTS observations yield a weighted mean of 15.0 ± 0.1 ppb excess XN2O above background in the LA basin from 2013 to 2019. Time series of XN2Oxs show a seasonal cycle with a peak-to-peak amplitude of 5.6 ± 2.5 ppb, where greater XN2Oxs values are observed during the winter/spring and minima occur in late summer/early fall. A tracer-tracer ratio method is applied using XN2Oxs and XCO2,xs observations to estimate top-down N2O emissions for the LA basin during 2013–2018. Estimated monthly emissions range from 6 to 19 Gg N2O per month and exhibit a similar seasonal cycle to that observed in XN2Oxs. Estimated annual emissions fall within the range 124–144 Gg per year for the years 2014–2018. These top-down annual estimates are roughly 3 times the official statewide bottom-up inventory for the same time period, but consistent considering uncertainties with other top-down estimates for the LA basin. The discrepancy between top-down emission estimates and the statewide bottom-up inventory highlights the difficulty in constraining N2O emissions, especially for an urban environment. © 2021 Elsevier Inc.
英文关键词	CLARS; Los Angeles; Megacity; Nitrous oxide; Urban remote sensing
语种	英语
scopus关键词	Atmospheric radiation; Greenhouse gases; Ozone layer; Remote sensing; Uncertainty analysis; Bottom up; CLARS; Greenhouses gas; Los angeles; Megacities; N$-2$/O; Nitrous oxide; Seasonal cycle; Topdown; Urban remote sensing; Nitrogen oxides; air quality; anthropogenic source; atmospheric pollution; greenhouse gas; megacity; mountain region; nitrous oxide; observatory; remote sensing; seasonality
来源期刊	Remote Sensing of Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/178863
作者单位	Department of Physics, Occidental College, Los Angeles, CA, United States; Joint Institute for Regional Earth System Science and Engineering, University of California, Los Angeles, Los Angeles, CA, United States; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, AZ, United States; School of Life Sciences, Arizona State University, Tempe, AZ, United States
推荐引用方式 GB/T 7714	Addington O.,Zeng Z.-C.,Pongetti T.,et al. Estimating nitrous oxide (N2O) emissions for the Los Angeles Megacity using mountaintop remote sensing observations[J],2021,259.
APA	Addington O..,Zeng Z.-C..,Pongetti T..,Shia R.-L..,Gurney K.R..,...&Sander S.P..(2021).Estimating nitrous oxide (N2O) emissions for the Los Angeles Megacity using mountaintop remote sensing observations.Remote Sensing of Environment,259.
MLA	Addington O.,et al."Estimating nitrous oxide (N2O) emissions for the Los Angeles Megacity using mountaintop remote sensing observations".Remote Sensing of Environment 259(2021).