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ABoVE: Lake Growing Season Green Surface Reflectance Trends

Submitted by ORNL DAAC Staff on 2021-09-27
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Trends in "greenness" of lake surface reflectance.
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Caption

Lakes with significant negative trends in "greenness" of lake surface reflectance (left) and positive trends (right) across growing seasons from 1984-2019 below 75 degrees N. Source: Kuhn and Butman, 2021

The ORNL DAAC recently released a new Arctic-Boreal Vulnerability Experiment (ABoVE) dataset by Kuhn, C., et al. (2021):

ABoVE: Lake Growing Season Green Surface Reflectance Trends, AK and Canada, 1984-2019

This dataset provides an annual time series of Landsat green surface reflectance and the derived annual growing season (June and July) trend for 472,890 lakes across the ABoVE Extended Study Domain from 1984 to 2019. The reflectance data are from Landsat-5, Landsat-7, and Landsat-8 sensors for the green band (center wavelength 560 nm). Over 270,000 Landsat scenes were evaluated and quality assured to be cloud-free and over water. Lakes were selected from HydroLAKES, a global database of lakes of at least 10 ha. Lake surface reflectance was extracted from a 3-by-3-pixel area centered on each lake centroid from the selected Landsat scenes determined from lake polygons. This dataset demonstrates changes in lake color over time in the arctic and boreal regions of North America. Color is relevant for understanding physical, ecological, and biogeochemical processes in an area of some of the world’s highest concentrations of lakes where climate change may have significant impacts.

The ABoVE is a NASA Terrestrial Ecology Program field campaign being conducted in Alaska and western Canada, for 8 to 10 years, starting in 2015. Research for ABoVE links field-based, process-level studies with geospatial data products derived from airborne and satellite sensors, providing a foundation for improving the analysis, and modeling capabilities needed to understand and predict ecosystem responses to, and societal implications of, climate change in the Arctic and Boreal regions.

Additional data from ABoVE and other relevant links can be found on the ORNL DAAC's ABoVE Project Page.

Citation: Kuhn, C., and D. Butman. 2021. ABoVE: Lake Growing Season Green Surface Reflectance Trends, AK and Canada, 1984-2019. ORNL DAAC, Oak Ridge, Tennessee, USA. https://doi.org/10.3334/ORNLDAAC/1866

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