Spatial extent of thermokarst lagoons along pan-Arctic coasts - an upscaling approach ...

• Main Authors: Jenrich, Maren, Nitze, Ingmar, Laboor, Sebastian, Angelopoulos, Michael, Grosse, Guido, Strauss, Jens
• Format: Dataset
• Language: English
• Published: PANGAEA 2023
• Subjects: Arctic lagoons; distribution; lagoon area; Permafrost; size; File content; Binary Object; Binary Object File Size; Satellite imagery; Carbon in Permafrost / Kohlenstoff im Permafrost KoPF; Changing Arctic Carbon cycle in the cOastal Ocean Near-shore CACOON; Rapid Permafrost Thaw in a Warming Arctic and Impacts on the Soil Organic Carbon Pool PETA-CARB; Arctic; Baldwin; Mackenzie Delta; Peta; Tiksi; Ice; lena delta; permafrost; Thermokarst
• Online Access: https://dx.doi.org/10.1594/pangaea.948267; https://doi.pangaea.de/10.1594/PANGAEA.948267

Along the ice rich pan-Arctic permafrost coasts thermokarst lagoons are a common landscape feature. These lagoons form when thermokarst lakes are inundated permanently or intermittently by the sea. This is the first estimation of the area of pan-Arctic thermokarst lagoons based on the mapping of 79 lagoons in 5 representative arctic regions: Mackenzie Delta (CA), Theshekpuk Lake coast (USA), Baldwin Peninsula (USA), Tiksi coast (RU), Lena Delta (RU). The extent of each of the lagoons was determined using the Global Surface Water dataset which is based on Landsat-5, -7, and -8 satellite images from 1984 to 2018 at 30m resolution (Pekel et al., 2016). Water bodies were defined by a water occurrence threshold of >75% over this time period. The raster dataset was vectorized and smaller geometric errors, which occurred during vectorization, were solved with the Fix Geometry function in QGIS3.6. The lagoon polygons were selected manually and these water bodies were split from the ocean by using the function ...