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- W2594049968 abstract "Abstract We quantify methane (CH 4 ) emissions in California's San Joaquin Valley (SJV) by using 4 days of aircraft measurements from a field campaign during May–June 2010 together with a Bayesian inversion method and a mass balance approach. For the inversion estimates, we use the FLEXible PARTicle dispersion model (FLEXPART) to establish the source‐receptor relationship between sampled atmospheric concentrations and surface fluxes. Our prior CH 4 emission estimates are from the California Greenhouse Gas Emissions Measurements (CALGEM) inventory. We use three meteorological configurations to drive FLEXPART and subsequently construct three inversions to analyze the final optimized estimates and their uncertainty (one standard deviation). We conduct May and June inversions independently and derive similar total CH 4 emission estimates for the SJV: 135 ± 28 Mg/h in May and 135 ± 19 Mg/h in June. The inversion result is 1.7 times higher than the prior estimate from CALGEM. We also use an independent mass balance approach to estimate CH 4 emissions in the northern SJV for one flight when meteorological conditions allowed. The mass balance estimate provides a confirmation of our inversion results, and these two independent estimates of the total CH 4 emissions in the SJV are consistent with previous studies. In this study, we provide optimized CH 4 emissions estimates at 0.1° horizontal resolution. Using independent spatial information on major CH 4 sources, we estimate that livestock contribute 75–77% and oil/gas production contributes 15–18% of the total CH 4 emissions in the SJV. Livestock explain most of the discrepancies between the prior and the optimized emissions from our inversion." @default.
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- W2594049968 date "2017-03-27" @default.
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- W2594049968 title "Top‐down estimate of methane emissions in California using a mesoscale inverse modeling technique: The San Joaquin Valley" @default.
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- W2594049968 doi "https://doi.org/10.1002/2016jd026398" @default.
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