Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China
Abstract Thermokarst lakes play a key role in the hydrological and biogeochemical cycles of permafrost regions. Current knowledge regarding the changes caused by permafrost degradation to the hydrochemistry of lakes in the Qinghai‐Tibet Plateau (QTP) is limited. To address this gap, a systematic inv...
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crwiley:10.1002/hyp.13987 2024-10-13T14:07:57+00:00 Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China Gao, Zeyong Niu, Fujun Lin, Zhanju National Natural Science Foundation of China West Light Foundation of the Chinese Academy of Sciences 2020 http://dx.doi.org/10.1002/hyp.13987 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.13987 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/hyp.13987 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Hydrological Processes volume 34, issue 26, page 5659-5673 ISSN 0885-6087 1099-1085 journal-article 2020 crwiley https://doi.org/10.1002/hyp.13987 2024-09-17T04:43:56Z Abstract Thermokarst lakes play a key role in the hydrological and biogeochemical cycles of permafrost regions. Current knowledge regarding the changes caused by permafrost degradation to the hydrochemistry of lakes in the Qinghai‐Tibet Plateau (QTP) is limited. To address this gap, a systematic investigation of thermokarst lake water, suprapermafrost water, ground ice, and precipitation was conducted in the hinterland of the QTP. The thermokarst lake water in the QTP was identified to be of the Na‐HCO 3 ‐Cl type. The mean concentrations of HCO 3 − and Na + were 281.8 mg L −1 (146.0–546.2 mg L −1 ) and 73.3 mg L −1 (9.2–345.8 mg L −1 ), respectively. The concentrations of Li + , NH 4 + , K + , F − , NO 2 − , and NO 3 − were relatively low. Freeze‐out fractionation concentrated the dissolved solids within the lake water during winter, which was deeply deepened on lake depth and lake ice thickness. Owing to solute enrichment, the ground ice was characterized by high salinity. Conversely, repeated replenishment via precipitation led to lower solute concentrations in the ground ice near the permafrost table compared to that within the permafrost. Although lower solute concentration existed in precipitation, the soil leaching and saline ground ice melting processes enhanced the solute load in suprapermafrost water, which is considered an important water and solute resource in thermokarst lakes. The influencing mechanism of permafrost degradation on thermokarst lake hydrochemistry is presumably linked to: (1) the liberation of soluble materials sequestered in ground ice; (2) the increase of solutes in suprapermafrost water and soil pore water; and (3) the changes in lake morphometry. These results have major implications on the understanding of the effects of ground ice melting on ecosystem functions, biogeochemical processes, and energy balance in a rapidly changing climate. Article in Journal/Newspaper Ice permafrost Thermokarst Wiley Online Library Hydrological Processes 34 26 5659 5673 |
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English |
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Abstract Thermokarst lakes play a key role in the hydrological and biogeochemical cycles of permafrost regions. Current knowledge regarding the changes caused by permafrost degradation to the hydrochemistry of lakes in the Qinghai‐Tibet Plateau (QTP) is limited. To address this gap, a systematic investigation of thermokarst lake water, suprapermafrost water, ground ice, and precipitation was conducted in the hinterland of the QTP. The thermokarst lake water in the QTP was identified to be of the Na‐HCO 3 ‐Cl type. The mean concentrations of HCO 3 − and Na + were 281.8 mg L −1 (146.0–546.2 mg L −1 ) and 73.3 mg L −1 (9.2–345.8 mg L −1 ), respectively. The concentrations of Li + , NH 4 + , K + , F − , NO 2 − , and NO 3 − were relatively low. Freeze‐out fractionation concentrated the dissolved solids within the lake water during winter, which was deeply deepened on lake depth and lake ice thickness. Owing to solute enrichment, the ground ice was characterized by high salinity. Conversely, repeated replenishment via precipitation led to lower solute concentrations in the ground ice near the permafrost table compared to that within the permafrost. Although lower solute concentration existed in precipitation, the soil leaching and saline ground ice melting processes enhanced the solute load in suprapermafrost water, which is considered an important water and solute resource in thermokarst lakes. The influencing mechanism of permafrost degradation on thermokarst lake hydrochemistry is presumably linked to: (1) the liberation of soluble materials sequestered in ground ice; (2) the increase of solutes in suprapermafrost water and soil pore water; and (3) the changes in lake morphometry. These results have major implications on the understanding of the effects of ground ice melting on ecosystem functions, biogeochemical processes, and energy balance in a rapidly changing climate. |
author2 |
National Natural Science Foundation of China West Light Foundation of the Chinese Academy of Sciences |
format |
Article in Journal/Newspaper |
author |
Gao, Zeyong Niu, Fujun Lin, Zhanju |
spellingShingle |
Gao, Zeyong Niu, Fujun Lin, Zhanju Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
author_facet |
Gao, Zeyong Niu, Fujun Lin, Zhanju |
author_sort |
Gao, Zeyong |
title |
Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
title_short |
Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
title_full |
Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
title_fullStr |
Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
title_full_unstemmed |
Effects of permafrost degradation on thermokarst lake hydrochemistry in the Qinghai‐Tibet Plateau, China |
title_sort |
effects of permafrost degradation on thermokarst lake hydrochemistry in the qinghai‐tibet plateau, china |
publisher |
Wiley |
publishDate |
2020 |
url |
http://dx.doi.org/10.1002/hyp.13987 https://onlinelibrary.wiley.com/doi/pdf/10.1002/hyp.13987 https://onlinelibrary.wiley.com/doi/full-xml/10.1002/hyp.13987 |
genre |
Ice permafrost Thermokarst |
genre_facet |
Ice permafrost Thermokarst |
op_source |
Hydrological Processes volume 34, issue 26, page 5659-5673 ISSN 0885-6087 1099-1085 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/hyp.13987 |
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Hydrological Processes |
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34 |
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26 |
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5673 |
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1812814523147485184 |