Ratios of (a) maximum rate of carboxylation to respiration at 25 degrees C from Griffin et al. (2022) (Vcmax /R25 ) and (b) maximum electron transport rate to respiration at 25 degrees C from Griffin et al. (2022) (Jmax /R25 ) of white spruce from high and low canopy positions at the Forest Tundra Ecotone (FTE, blue), Alaska, and Black Rock Forest (BRF, green), New York. Boxplots show the median and first and third quartiles. Whiskers display the range of groups with individual points representing outliers falling outside 1.5 times the interquartile range. Different letters represent significant differences between locations and canopy positions.
Measurements of gas exchange, leaf traits, leaf pigments, the photochemical reflectance index, and average photosynthetic photon flux density from hemispherical photographs.
The 2007 Anaktuvuk River fire burned across riparian stringers and wet channels around high-centered polygons that are typically left as unburned inclusions. (2008 photo by D. Yokel). Source: Jandt et al., 2012.
Field measurements from 26 burned and unburned transects established in 2008 in the region of the Anaktuvuk River tundra fire on the Arctic Slope of Alaska, US.
Four subregions of Alaska (left) with example of lakes and ponds derived from PlanetScope imagery (right). Lake and pond extents include monthly climatological composites (May - September) and 3-year composites for 2019-2021. The inset for the Fairbanks (FB) region shows a close-up of the water extents overlain on sub-meter Esri base map imagery. The Yukon Flats (YF) inset shows variability in surface area of large lakes. The Delta Junction (DJ) inset shows seasonal changes in the area of small ponds. The Yukon-Kuskokwim Delta (YKD) inset shows the spatial variability of water body areas in this region and is an example of a 3-year composite.
Polygon spatial files of lake and pond extents for three sub-regions of Interior Alaska's boreal forest, and one tundra region located in Alaska's Yukon-Kuskokwim Delta.
A map showing the ground tracks for the airborne campaign with a table summarizing each flight. The colors in the table match those shown in the ground tracks. Image is from the related dataset Abshire et al. (2022).
In situ airborne measurements of atmospheric chemistry from 2017-07-20 to 2017-08-08 over Alaska, US, and the Yukon and Northwest Territories of Canada.
Two examples of uncorrected and corrected months Canada-Alaska domain. The correction is applied to pixels > 500 m, so the correction is seen primarily in mountainous areas. Figure from Lober et al. (in review).
Bias-corrected IMERG monthly precipitation data for Alaska & Canada from June 2000 - December 2020.
A portion of the quicklook image from flight line ang20170714t212855 over Barrow, Alaska on July 14, 2017. Two sites (AB_B10_L001_FL175_PipelineLake and AB_B10_L003_FL175_PipelineLake) of interest to the ABoVE project are visible. Flight altitude was approximately 5,400 m with very thin cirrus cloud cover.
Level 1 radiance and Level 2 surface reflectance measured by the AVIRIS-NG instrument during flights over the ABoVE domain from June to August in 2017 and July to August in 2018 and 2019.