The 1-km Permafrost Zonation Index Map over the Tibetan Plateau (2019)
Based on a recently developed inventory of permafrost presence or absence from 1475 in situ observations, we developed and trained a statistical model and used it to compile a high‐resolution (30 arc‐ seconds) permafrost zonation index (PZI) map. The PZI model captures the high spatial variability of permafrost distribution over the QTP because it considers multi- ple controlling variables, including near‐surface air temperature downscaled from re‐ analysis, snow cover days and vegetation cover derived from remote sensing. Our results showed the new PZI map achieved the best performance compared to avail- able existing PZI and traditional categorical maps. Based on more than 1000 in situ measurements, the Cohen's kappa coefficient and overall classification accuracy were 0.62 and 82.5%, respectively. Excluding glaciers and lakes, the area of permafrost regions over the QTP is approximately 1.54 (1.35–1.66) ×106 km2, or 60.7 (54.5– 65.2)% of the exposed land, while area underlain by permafrost is about 1.17 (0.95–1.35) ×106 km2, or 46 (37.3–53.0)%.
DatasetS1: The 1-km mean annual air temperature during 1979 and 1999 over the Tibetan Plateau DatasetS2: The 1-km scaled mean annual snow cover days between 2003 and 2010 over the Tibetan Plateau DatasetS3: The 1-km median maximum NDVI during 2002 and 2017 over the Tibetan Plateau DatasetS4: The 1-km permafrost zonation index map over the Tibetan Plateau DatasetS5: The lake inverntory DatasetS6: The glacier inverntory
[1] Cao, B., Zhang, T., Wu, Q., Sheng, Y., Zhao, L., & Zou, D. (2019). Permafrost zonation index map and statistics over the Qinghai‐Tibet Plateau based on field evidence. Permafrost and Periglac Process, 30, 178– 194. https://doi.org/10.1002/ppp.2006. (查看)
[2] Cao, B., Zhang, T., Wu, Q., Sheng, Y., Zhao, L., & Zou, D. (2019). Brief communication: Evaluation and inter-comparisons of Qinghai–Tibet Plateau permafrost maps based on a new inventory of field evidence, The Cryosphere, 13, 511–519, https://doi.org/10.5194/tc-13-511-2019. (查看)
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