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High Latitude Annual Snow Melt Duration from Passive Microwave Sensors

Submitted by ORNL DAAC Staff on 2021-07-15
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Descriptive statistics for snow melt duration (SMD) for the period 1988-2016, including mean, standard deviation, and coefficient of variation. Units are the number of days per year. 

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This dataset provides the annual period of snowpack melting across northwest Canada; Alaska, U.S.; and parts of far eastern Russia at 6.25 km resolution for the period 1988-2016.
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High Latitude Annual Seasonal Snow Melt Onset from Passive Microwave Sensors

Submitted by ORNL DAAC Staff on 2021-07-15
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Spatial extent of snowpack main melt onset dataset (MMOD) extending from the Russian Far East across Alaska into Canada's Northwest Territories and British Columbia. Source: Pan et al. (2021)

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This dataset provides the annual date of snowpack seasonal beginning melt across northwest Canada; Alaska, U.S.; and parts of far eastern Russia for 1988-2016.
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ABoVE: Frozen Lake Aerial Photographs Identify CH4 Seeps

Submitted by ORNL DAAC Staff on 2021-06-13
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Location of the study area northwest of Fairbanks, AK, USA. The map shows (a) yedoma permafrost distribution and (b) yedoma lakes and terrain of the Goldstream Valley. Data sources include Strauss et al. (2016), Alaska LiDAR Dataset (USGS, 2018), Elevation Datasets of Alaska (DGGS Staff, 2013), and Walter Anthony et al. (2020).

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Orthophotographs of lakes near of Fairbanks, AK, identify open holes in lake ice that indicate the location of releases of CH4 from thawing permafrost.

Methane Ebullition Hotspot Locations in Frozen Lakes near Fairbanks, Alaska

Submitted by ORNL DAAC Staff on 2021-06-06
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Location of 15 lakes surveyed for methane ebullition hotspots (green points) north of Fairbanks, AK, on October 8, 2014. Inset shows detail of Eagle Lake with locations of 43 hotspots (red points) detected by openings in lake ice.

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Locations and number of methane ebullition hotspots in frozen lakes in the southern portion of the Goldstream Valley and surroundings near Fairbanks, Alaska.

Annual Aboveground Biomass for Boreal Forests of ABoVE Core Domain, 1984-2014

Submitted by ORNL DAAC Staff on 2021-06-06
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Spatial distribution of predicted aboveground biomass (AGB) density averaged over 1984-2014 for the ABoVE Core Study Domain. Ecoregions represent the EPA Level 2 Ecoregion boundaries. Source: Wang et al. (2021)

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Estimated annual AGB density for live woody species in the ABoVE Core Study Domain from 1984-2014.

UAVSAR P-band polarimetric data from flight lines over Alaska and western Canada, 2017

Submitted by ORNL DAAC Staff on 2021-05-21
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UAVSAR P-band SAR radar swaths over study sites across Alaska, USA, and western Canada for the 2017 ABoVE campaign.

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Level 1 polarimetric radar backscattering coefficient, multi-look complex, polarimetrically calibrated, and georeferenced data products for study sites.

Wolf Denning Phenology and Reproduction in ABoVE Core Domain, 2000-2017

Submitted by ORNL DAAC Staff on 2021-03-24
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Spatial distribution of eight wolf study populations used in an assessment (from 2000-2017) of denning phenology in response to climate signals. The base map shows the day of the year representing the NDVI-derived start of the growing season in 2010. 

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Eighteen years of annual gray wolf (Canis lupus) denning spatial information and timing across within the NASA ABoVE Core Domain recently published.

Active Layer Thickness Derived from Airborne L- and P-band SAR

Submitted by ORNL DAAC Staff on 2021-03-24
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Sites in Version 2 of the Permafrost Dynamics Observatory Project product. Green = data delivered in Version 2. Red = not delivered in Version 2 but will be delivered in future version. Yellow = not processed due to only L-band data being available.

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Estimates of seasonal subsidence, ALT, vertical soil moisture profile, and uncertainties at a 30-m resolution for 28 sites across the ABoVE domain are now available.