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Landscape-Scale Estimates of Methane Ebullition from Lakes

Map of Alaska study regions.

SAR-based lake ebullition maps. Panel a shows Alaska study regions with SAR footprints outlined in yellow. Subsequent panels show SAR-based CH4 ebullition maps for b) Barrow Peninsula, c) Atqasuk, d) Toolik, e) northern Seward Peninsula, and f) Fairbanks. Study lakes with field-based measurements are outlined (b,c) or boxed (d,e,f) in white. Orange boxes in panel f indicate anthropogenic study lakes.

Synthetic Aperture Radar (SAR) was used to estimate methane ebullition flux for thousands of lakes in five regions across Alaska.

ACT-America: L3 Integrated Measurements and 2019 Data

Map of ACT-America 2019 Flight Paths

ACT-America 2019 summer airborne campaign showing the flight paths for the two aircrafts and location of ground towers. Flights were concentrated on three study domains: northeast, south-central, and midwest regions of the United States.

A new version of merged in situ atmospheric trace gases and flask data from the Atmospheric Carbon and Transport-America project is now available.

Comparison of In-Situ Measurements from NASA Airborne Campaigns

DLR Falcon and NASA DC-8 aircrafts

Left: The DLR Falcon used for the SALTRACE 2013 and the A-LIFE 2017 campaigns. Right: The NASA DC-8 aircraft used during the ATom missions sitting at the Pago Pago International Airport, American Samoa.

A new dataset from the Atmospheric Tomography Mission (ATom) compares airflow and aerosol particles.

Soil Temperature Profiles Characterize Permafrost at USArray Sites

Map of soil profile study sites.

Sixteen measurement sites located across interior Alaska, USA, and at one site in Yukon, Canada. Sites C17K, C26K, E23, F17, H31, and I17 are collocated with the seismic stations.

New soil temperature profile measurements collected at USArray stations are available from the Arctic-Boreal Vulnerability Experiment (ABoVE).

Soil Pit Properties from the Arctic-Boreal Vulnerability Experiment

Site sampling plan for active layer soil characterization.

Site sampling plan used for characterizing active layer soils (left). Axes are in meters. At Imnavait Creek, active layer thickness (ALT) was measured on transects intersecting a central soil pit. Soil dielectric properties, in situ moisture and temperature profiles were measured, and soil samples were collected for analyses from the soil pit (right).

Active layer thickness, soil dielectric profiles, and soil physical properties are key variables for understanding the Arctic permafrost layer.