The Boreal–Arctic Wetland and Lake Dataset (BAWLD)

作者：David Olefeldt, Mikael Hovemyr, McKenzie A. Kuhn, David Bastviken, T. J. Bohn, John F. Connolly, Patrick Crill, Eugenie Susanne Euskirchen, Sarah A. Finkelstein, Hélène Genet, Guido Grosse, Lorna I. Harris, Liam Heffernan, Manuel Helbig, Gustaf Hugelius, Ryan H. S. Hutchins, Sari Juutinen, Mark Jason Lara, Avni Malhotra, Kristen Manies, Anthony David McGuire, Susan M. Natali, Jonathan A. O’Donnell, Frans‐Jan W. Parmentier, Aleksi Räsänen, Christina Schädel, Oliver Sonnentag, Maria Strack, Suzanne E. Tank, Claire Clark Treat, R. K. Varner, Tarmo A. Virtanen, Rebecca K. Warren, Jennifer D. Watts · 发表于：Earth system science data · 年份：2021 · DOI：10.5194/essd-13-5127-2021 · 被引用次数：131 · 研究领域：Climate change and permafrost、Peatlands and Wetlands Ecology、Cryospheric studies and observations

Methane emissions from boreal and arctic wetlands, lakes, and rivers are expected to increase in response to warming and associated permafrost thaw. However, the lack of appropriate land cover datasets for scaling field-measured methane emissions to circumpolar scales has contributed to a large uncertainty for our understanding of present-day and future methane emissions. Here we present the Boreal–Arctic Wetland and Lake Dataset (BAWLD), a land cover dataset based on an expert assessment, extrapolated using random forest modelling from available spatial datasets of climate, topography, soils, permafrost conditions, vegetation, wetlands, and surface water extents and dynamics. In BAWLD, we estimate the fractional coverage of five wetland, seven lake, and three river classes within 0.5 × 0.5 ∘ grid cells that cover the northern boreal and tundra biomes (17 % of the global land surface). Land cover classes were defined using criteria that ensured distinct methane emissions among classes, as indicated by a co-developed comprehensive dataset of methane flux observations. In BAWLD, wetlands occupied 3.2 × 10 6 km 2 (14 % of domain) with a 95 % confidence interval between 2.8 and 3.8 × 10 6 km 2 . Bog, fen, and permafrost bog were the most abundant wetland classes, covering ∼ 28 % each of the total wetland area, while the highest-methane-emitting marsh and tundra wetland classes occupied 5 % and 12 %, respectively. Lakes, defined to include all lentic open-water ecosystems regardle...