A105-01
Constraining Methane Fluxes from the Eastern US using ACT-America Airborne Data and the GEOS-Chem Adjoint Model

Thursday, 10 December 2020: 17:30
Virtual
Xin Chen1, Dylan B Millet1, Kelley C Wells1, Xueying Yu1, Joshua P DiGangi2, Bianca Baier3, Kathryn McKain3, Zachary Barkley4, Kenneth J Davis4 and ACT-America Team, (1)University of Minnesota Twin Cities, St Paul, MN, United States, (2)NASA Langley Research Center, Hampton, VA, United States, (3)NOAA ESRL Global Monitoring Division, Boulder, CO, United States, (4)The Pennsylvania State University, University Park, PA, United States
Abstract:
The ACT-America campaign (07/2016 - 07/2019) provides the most comprehensive set of airborne methane observation to date over the Eastern US. Here we combine the ACT-America dataset with a high-resolution chemical transport model (GEOS-Chem CTM at 0.25°×0.3125°) and its adjoint to develop an improved understanding of the methane budget for this region under a single integrated inversion framework. Forward model errors (e.g., methane background; boundary layer depth) are assessed and mitigated prior to the inversion. Prior emission inventories in the model include GEPA, Canada and Mexico oil/gas emissions, WetCHARTs v1.0, daily QFED v2.5r1, etc. This presentation will discuss the optimal estimation results including error assessment and cross-evaluation against independent observations.
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