ALBERT

Description: Methane emissions from oil/gas fields originate from a large number of relatively small and densely clustered point sources. A small fraction of high-mode emitters can make a large contribution to the total methane emission. Here we conduct observation system simulation experiments (OSSEs) to examine the potential of recently launched or planned satellites to detect and locate these high-mode emitters through measurements of atmospheric methane columns. We simulate atmospheric methane over a generic oil/gas field (20–500 production sites of different size categories in a 50×50km2 domain) for a 1-week period using the WRF-STILT meteorological model with 1.3×1.3km2 horizontal resolution. The simulations consider many random realizations for the occurrence and distribution of high-mode emitters in the field by sampling bi-modal probability density functions (pdfs) of emissions from individual sites. The atmospheric methane fields for each realization are observed virtually with different satellite and surface observing configurations. Column methane enhancements observed from satellites are small relative to instrument precision, even for high-mode emitters, so an inverse analysis is necessary. The inverse analysis can be regularized effectively using a L-1 norm to provide sparse solutions for a bi-modally distributed variable. We find that the recently launched TROPOMI instrument (low Earth orbit, 7×7km2 nadir pixels, daily return time) and the planned GeoCARB instrument (geostationary orbit, 2.7×3.0km2 pixels, 2× or 4×/day return time) are successful at locating high-emitting sources for fields of 20–50 emitters within the 50×50km2 domain but are unsuccessful for denser fields. GeoCARB does not benefit significantly from more frequent observations (4×/day vs. 2×/day) because of temporal error correlation in the inversion. It becomes marginally successful when allowing a 5-km error tolerance for localization. A next-generation geostationary satellite instrument with 1.3×1.3km2 pixels, hourly return time, and 1 ppb precision can successfully detect and locate the high-mode emitters for a dense field with up to 500 sites in the 50×50km2 domain. The capabilities of TROPOMI and GeoCARB can be usefully augmented with a surface air observation network of 5–20 sites, and in turn the satellite instruments increase the detection capability that can be achieved from the surface sites alone.