DAAC Home > Resources > News

News

ABoVE

High Latitude Blue Sky Albedo

Submitted by ORNL DAAC Staff on 2020-01-27
Image Media
Image Media
Caption

Daily mean shortwave blue sky albedo for February 28, 2000. Blue sky refers to albedo calculated under real-world conditions with a combination of both diffuse and direct lighting based on atmospheric and view-geometry conditions.

Body

Daily “blue sky” shortwave albedo data were derived from the MODIS bi-directional reflectance distribution function.

Snowoff Date from 1988-2016

Submitted by ORNL DAAC Staff on 2020-01-06
Image Media
Image Media
Caption

Summary statistics for the snowoff date from 1988-2016 across the study domain: mean (left), standard deviation (middle), and coefficient of variation (right).

Body

Snowoff dates, detected by passive microwave, are available across Alaska, northwestern Canada, and the Russian Far East.

Thaw Slump Expansion in Alaska

Submitted by ORNL DAAC Staff on 2019-12-30
Image Media
Image Media
Caption

Annual expansion of a thaw slump on the East Fork Chandalar River near the community of Venetie, Alaska, from 2008 through 2017. The erosion time series was created by digitizing data from ESRI base maps and Landsat 5, 7, and 8 images. The eroded area appears to be growing steadily, mostly to the east, with apparent limitation on growth to the north and south.

Body

A time series of Landsat-derived maps shows the expansion of a thaw slump in Alaska.

Subsistence Use Areas in Alaska

Submitted by ORNL DAAC Staff on 2019-11-04
Image Media
Image Media
Caption

Combined map of subsistence resource use areas of Interior Alaskan communities with (1) points marking harvest effort locations, (2) polygons indicating harvest effort areas, and (3) lines indicating linear harvesting activity.

Body

Maps of the search and harvest areas used by residents of Interior Alaska are available.

Tracking Permafrost with P-band SAR

Submitted by ORNL DAAC Staff on 2019-11-04
Image Media
Image Media
Caption

AirMOSS radar swaths flown in 2014 and 2015 in Alaska. In situ soil moisture and temperature profile measurements were obtained at the CALM (Circumpolar Active Layer Monitoring) and the UAF GIPL (Geophysical Institute Permafrost Laboratory, University of Alaska Fairbanks) sites and used to validate AirMOSS data products.

Body

Airborne Microwave Observatory of Subcanopy and Subsurface (AirMOSS) radar data from Alaska are used to derive estimates of active layer thickness. Data from flights in 2014 and 2015 are now available.

Vegetation Imagery from Toolik Lake, Alaska

Submitted by ggb on 2019-10-14
Image Media
Image Media
Caption

A plot photo (#0656) taken at the largest study area 'Toolik' at elevation 765.7 m. The small white object was included in many of the photos as a color reference. The photographer's boots are also often visible, in this photo they are to the lower left of the white object.

Body

A new ABoVE dataset offers hundreds of ground-based vegetation photos which may serve as a reference for studies of climate and vegetation change in the area.

Winter Carbon Flux From Arctic & Boreal Soils

Submitted by ORNL DAAC Staff on 2019-09-16
Image Media
Image Media
Caption

Mean daily soil CO2 flux in each month of the non-growing season (NGS) during the baseline period (2003-2018). Gridded estimates are provided at 25-km resolution for the pan-Arctic and Boreal permafrost region.

Body

New data from the Arctic-Boreal Vulnerability Experiment (ABoVE) provide winter soil CO2 flux estimates for the pan-Arctic and Boreal regions.

Vegetation and Carbon Impacts of Boreal Wildfires

Submitted by ORNL DAAC Staff on 2019-09-03
Image Media
Image Media
Caption

Investigators collected field data and inventoried plots for vegetation species and growth in 2018 at a post-burn site. (Image Credit: Laura Bourgeau-Chavez)

Body

A new dataset completes four years of post-fire vegetation sampling at burned sites in Canada's Northwest Territories.