Appalachian Active Passive Methane Airborne Constraints

The Campaign

The Appalachian Active Passive Methane Airborne Constraints (APMAC) was a NASA field investigation that collected remote-sensing observations of methane concentrations, with emissions constrained in time and space, to test and validate inverse regional models. It included one deployment during the boreal summer of 2025 across the Appalachian Basin, Washington, D.C., and the Baltimore urban area. The NASA Gulfstream-III collected remotely sensed methane data using NASA LaRC’s High Altitude Lidar Observatory (HALO) and Harvard University’s MethaneAIR spectrometer. APMAC supported the NASA Mid-Atlantic Gas Emissions Quantification (MAGEQ) campaign.

Additional Notes

Repositories

• other NASA repository not formally considered a DAAC by ESDS