Constraining Methane Fluxes from the Eastern US using ACT-America Airborne Data and the GEOS-Chem Adjoint Model
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.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMA105...01C
- Keywords:
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- 0315 Biosphere/atmosphere interactions;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0322 Constituent sources and sinks;
- ATMOSPHERIC COMPOSITION AND STRUCTURE;
- 0414 Biogeochemical cycles;
- processes;
- and modeling;
- BIOGEOSCIENCES;
- 0428 Carbon cycling;
- BIOGEOSCIENCES