Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence
Permafrost is prevalent over the Qinghai–Tibet Plateau (QTP), but mapping its distribution is challenging due to the limited availability of ground‐truth data sets and strong spatial heterogeneity in the region. Based on a recently developed inventory of permafrost presence or absence from 1475 in s...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.2006 |
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ftrepec:oai:RePEc:wly:perpro:v:30:y:2019:i:3:p:178-194 2023-05-15T17:55:30+02:00 Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence Bin Cao Tingjun Zhang Qingbai Wu Yu Sheng Lin Zhao Defu Zou https://doi.org/10.1002/ppp.2006 unknown https://doi.org/10.1002/ppp.2006 article ftrepec https://doi.org/10.1002/ppp.2006 2020-12-04T13:31:25Z Permafrost is prevalent over the Qinghai–Tibet Plateau (QTP), but mapping its distribution is challenging due to the limited availability of ground‐truth data sets and strong spatial heterogeneity in the region. 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 multiple 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 available 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)%. Article in Journal/Newspaper permafrost RePEc (Research Papers in Economics) Permafrost and Periglacial Processes 30 3 178 194 |
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Open Polar |
collection |
RePEc (Research Papers in Economics) |
op_collection_id |
ftrepec |
language |
unknown |
description |
Permafrost is prevalent over the Qinghai–Tibet Plateau (QTP), but mapping its distribution is challenging due to the limited availability of ground‐truth data sets and strong spatial heterogeneity in the region. 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 multiple 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 available 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)%. |
format |
Article in Journal/Newspaper |
author |
Bin Cao Tingjun Zhang Qingbai Wu Yu Sheng Lin Zhao Defu Zou |
spellingShingle |
Bin Cao Tingjun Zhang Qingbai Wu Yu Sheng Lin Zhao Defu Zou Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
author_facet |
Bin Cao Tingjun Zhang Qingbai Wu Yu Sheng Lin Zhao Defu Zou |
author_sort |
Bin Cao |
title |
Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
title_short |
Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
title_full |
Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
title_fullStr |
Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
title_full_unstemmed |
Permafrost zonation index map and statistics over the Qinghai–Tibet Plateau based on field evidence |
title_sort |
permafrost zonation index map and statistics over the qinghai–tibet plateau based on field evidence |
url |
https://doi.org/10.1002/ppp.2006 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
https://doi.org/10.1002/ppp.2006 |
op_doi |
https://doi.org/10.1002/ppp.2006 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
30 |
container_issue |
3 |
container_start_page |
178 |
op_container_end_page |
194 |
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1766163448783175680 |