Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet
Freezing and thawing indices (FI and TI) are commonly used as indicators for climate change assessment and permafrost extent estimation in cold regions. In this study, based on the meteorological daily data (1978–2017) among 34 meteorological stations in Tibet, the temperature in space has been inte...
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crfrontiers:10.3389/fevo.2021.750961 2024-09-15T18:29:45+00:00 Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet Liao, Ying Li, Yiying Fan, Jihui Galoie, Majid Motamedi, Artemis 2021 http://dx.doi.org/10.3389/fevo.2021.750961 https://www.frontiersin.org/articles/10.3389/fevo.2021.750961/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Ecology and Evolution volume 9 ISSN 2296-701X journal-article 2021 crfrontiers https://doi.org/10.3389/fevo.2021.750961 2024-08-06T04:06:12Z Freezing and thawing indices (FI and TI) are commonly used as indicators for climate change assessment and permafrost extent estimation in cold regions. In this study, based on the meteorological daily data (1978–2017) among 34 meteorological stations in Tibet, the temperature in space has been interpolated and FI and TI have been calculated. Finally, spatiotemporal variations have been analyzed and the permafrost area has been estimated. The results showed the mean annual of FI and TI in Tibet are 1241.36 and 1290.22°C⋅day, respectively. A significant downward trend in freezing index (FI) and an upward trend in thawing index (TI) have been reported in the time series, in against, analyzing the spatial distribution showed there is an increasing trend from southeast to northwest for FI while TI was decreased gradually in the same region in Tibet. This research indicates that altitude has a significant influence on the change of FI and TI. With the increase of altitude, FI decreased and TI increased more significantly. The permafrost area was estimated at about 0.59 × 10 6 km 2 in Tibet. Article in Journal/Newspaper permafrost Frontiers (Publisher) Frontiers in Ecology and Evolution 9 |
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Freezing and thawing indices (FI and TI) are commonly used as indicators for climate change assessment and permafrost extent estimation in cold regions. In this study, based on the meteorological daily data (1978–2017) among 34 meteorological stations in Tibet, the temperature in space has been interpolated and FI and TI have been calculated. Finally, spatiotemporal variations have been analyzed and the permafrost area has been estimated. The results showed the mean annual of FI and TI in Tibet are 1241.36 and 1290.22°C⋅day, respectively. A significant downward trend in freezing index (FI) and an upward trend in thawing index (TI) have been reported in the time series, in against, analyzing the spatial distribution showed there is an increasing trend from southeast to northwest for FI while TI was decreased gradually in the same region in Tibet. This research indicates that altitude has a significant influence on the change of FI and TI. With the increase of altitude, FI decreased and TI increased more significantly. The permafrost area was estimated at about 0.59 × 10 6 km 2 in Tibet. |
format |
Article in Journal/Newspaper |
author |
Liao, Ying Li, Yiying Fan, Jihui Galoie, Majid Motamedi, Artemis |
spellingShingle |
Liao, Ying Li, Yiying Fan, Jihui Galoie, Majid Motamedi, Artemis Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
author_facet |
Liao, Ying Li, Yiying Fan, Jihui Galoie, Majid Motamedi, Artemis |
author_sort |
Liao, Ying |
title |
Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
title_short |
Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
title_full |
Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
title_fullStr |
Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
title_full_unstemmed |
Spatiotemporal Variations of Freezing and Thawing Indices During the Past Four Decades in Tibet |
title_sort |
spatiotemporal variations of freezing and thawing indices during the past four decades in tibet |
publisher |
Frontiers Media SA |
publishDate |
2021 |
url |
http://dx.doi.org/10.3389/fevo.2021.750961 https://www.frontiersin.org/articles/10.3389/fevo.2021.750961/full |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Frontiers in Ecology and Evolution volume 9 ISSN 2296-701X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fevo.2021.750961 |
container_title |
Frontiers in Ecology and Evolution |
container_volume |
9 |
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1810471187271122944 |