08 Aug 2022
08 Aug 2022
Status: this preprint is currently under review for the journal ESSD.

CALC-2020: a new baseline land cover map at 10 m resolution for the circumpolar Arctic

Chong Liu1,2, Xiaoqing Xu3, Xuejie Feng1, Xiao Cheng1,2, Caixia Liu4, and Huabing Huang1,2 Chong Liu et al.
  • 1School of Geospatial Engineering and Science, Sun Yat-Sen University, Guangzhou, 510275, China
  • 2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, 519000, China
  • 3Peng Cheng Laboratory, Shenzhen, 518066, China
  • 4Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100101, China

Abstract. The entire Arctic is rapidly warming, which brings in a multitude of environmental consequences far beyond the northern high-latitude limits. Land cover maps offer biophysical insights into the terrestrial environment and are therefore essential for understanding the transforming Arctic in the context of anthropogenic activity and climate change. Satellite remote sensing has revolutionized our ability to capture land cover information over large areas. However, circumpolar Arctic-scale fine resolution land cover mapping has been so far lacking. Here, we utilize a combination of multimode satellite observations and topographic data at 10 m resolution to provide a new baseline land cover product (CALC-2020) across the entire terrestrial Arctic for circa 2020. Accuracy assessments suggest that the CALC-2020 product exhibits satisfactory performances, with overall accuracies of 79.63 % and 67.27 %, respectively, at validation sample locations and field/flux tower sites. The derived land cover map also displays reasonable agreement with three pre-existing global products, meanwhile depicting much more subtle polar biome patterns. Based on the CALC-2020 dataset, we show that over half of the Arctic landmass is covered by graminoid tundra or lichen/moss. Spatially, the land cover distribution exhibits regional dominance, reflecting the complex suite of both biotic and abiotic processes that jointly determine the Arctic landscape. The CALC-2020 product we developed can be used to improve earth system modelling, and benefit the ongoing efforts on sustainable Arctic land management by public and non-governmental sectors. The CALC-2020 land cover product is freely available on Science Data Bank: (Xu et al., 2022a).

Chong Liu et al.

Status: open (until 03 Oct 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on essd-2022-224', Kun Jia, 13 Aug 2022 reply
  • RC1: 'Comment on essd-2022-224', Anonymous Referee #1, 14 Aug 2022 reply
  • RC2: 'Comment on essd-2022-224', Anonymous Referee #2, 26 Aug 2022 reply

Chong Liu et al.

Data sets

Circumpolar Arctic Land Cover for circa 2020 (CALC-2020) Xiaoqing Xu, Chong Liu, Caixia Liu, Fengming Hui, Xiao Cheng, Huabing Huang

Chong Liu et al.


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Short summary
Rapid Arctic changes are increasingly influencing human society both locally and globally. Land cover offers a basis for characterizing the terrestrial world, yet spatially detailed information on Arctic land cover is lacking. We employ multi-source data to develop a new land cover map for the circumpolar Arctic. Our product reveals regionally contrasting biome distributions not fully documented in existing studies, and thus enhances our understanding of the Arctic’s terrestrial system.