Simulated high-latitude soil thermal dynamics during the past 4 decades
Soil temperature ( T s ) change is a key indicator of the dynamics of permafrost. On seasonal and interannual timescales, the variability of T s determines the active-layer depth, which regulates hydrological soil properties and biogeochemical processes. On the multi-decadal scale, increasing T s no...
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ftdoajarticles:oai:doaj.org/article:f596bdf8d6b74650ac9b35db103c6bcb 2023-05-15T13:03:22+02:00 Simulated high-latitude soil thermal dynamics during the past 4 decades S. Peng P. Ciais G. Krinner T. Wang I. Gouttevin A. D. McGuire D. Lawrence E. Burke X. Chen B. Decharme C. Koven A. MacDougall A. Rinke K. Saito W. Zhang R. Alkama T. J. Bohn C. Delire T. Hajima D. Ji D. P. Lettenmaier P. A. Miller J. C. Moore B. Smith T. Sueyoshi 2016-01-01T00:00:00Z https://doi.org/10.5194/tc-10-179-2016 https://doaj.org/article/f596bdf8d6b74650ac9b35db103c6bcb EN eng Copernicus Publications http://www.the-cryosphere.net/10/179/2016/tc-10-179-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-179-2016 https://doaj.org/article/f596bdf8d6b74650ac9b35db103c6bcb The Cryosphere, Vol 10, Iss 1, Pp 179-192 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-179-2016 2022-12-31T12:26:15Z Soil temperature ( T s ) change is a key indicator of the dynamics of permafrost. On seasonal and interannual timescales, the variability of T s determines the active-layer depth, which regulates hydrological soil properties and biogeochemical processes. On the multi-decadal scale, increasing T s not only drives permafrost thaw/retreat but can also trigger and accelerate the decomposition of soil organic carbon. The magnitude of permafrost carbon feedbacks is thus closely linked to the rate of change of soil thermal regimes. In this study, we used nine process-based ecosystem models with permafrost processes, all forced by different observation-based climate forcing during the period 1960–2000, to characterize the warming rate of T s in permafrost regions. There is a large spread of T s trends at 20 cm depth across the models, with trend values ranging from 0.010 ± 0.003 to 0.031 ± 0.005 °C yr −1 . Most models show smaller increase in T s with increasing depth. Air temperature ( T sub>a ) and longwave downward radiation (LWDR) are the main drivers of T s trends, but their relative contributions differ amongst the models. Different trends of LWDR used in the forcing of models can explain 61 % of their differences in T s trends, while trends of T a only explain 5 % of the differences in T s trends. Uncertain climate forcing contributes a larger uncertainty in T s trends (0.021 ± 0.008 °C yr −1 , mean ± standard deviation) than the uncertainty of model structure (0.012 ± 0.001 °C yr −1 ), diagnosed from the range of response between different models, normalized to the same forcing. In addition, the loss rate of near-surface permafrost area, defined as total area where the maximum seasonal active-layer thickness (ALT) is less than 3 m loss rate, is found to be significantly correlated with the magnitude of the trends of T s at 1 m depth across the models ( R = −0.85, P = 0.003), but not with the initial total near-surface permafrost area ( R = −0.30, P = 0.438). The sensitivity of the total boreal near-surface ... Article in Journal/Newspaper Active layer thickness permafrost The Cryosphere Directory of Open Access Journals: DOAJ Articles The Cryosphere 10 1 179 192 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 S. Peng P. Ciais G. Krinner T. Wang I. Gouttevin A. D. McGuire D. Lawrence E. Burke X. Chen B. Decharme C. Koven A. MacDougall A. Rinke K. Saito W. Zhang R. Alkama T. J. Bohn C. Delire T. Hajima D. Ji D. P. Lettenmaier P. A. Miller J. C. Moore B. Smith T. Sueyoshi Simulated high-latitude soil thermal dynamics during the past 4 decades |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
Soil temperature ( T s ) change is a key indicator of the dynamics of permafrost. On seasonal and interannual timescales, the variability of T s determines the active-layer depth, which regulates hydrological soil properties and biogeochemical processes. On the multi-decadal scale, increasing T s not only drives permafrost thaw/retreat but can also trigger and accelerate the decomposition of soil organic carbon. The magnitude of permafrost carbon feedbacks is thus closely linked to the rate of change of soil thermal regimes. In this study, we used nine process-based ecosystem models with permafrost processes, all forced by different observation-based climate forcing during the period 1960–2000, to characterize the warming rate of T s in permafrost regions. There is a large spread of T s trends at 20 cm depth across the models, with trend values ranging from 0.010 ± 0.003 to 0.031 ± 0.005 °C yr −1 . Most models show smaller increase in T s with increasing depth. Air temperature ( T sub>a ) and longwave downward radiation (LWDR) are the main drivers of T s trends, but their relative contributions differ amongst the models. Different trends of LWDR used in the forcing of models can explain 61 % of their differences in T s trends, while trends of T a only explain 5 % of the differences in T s trends. Uncertain climate forcing contributes a larger uncertainty in T s trends (0.021 ± 0.008 °C yr −1 , mean ± standard deviation) than the uncertainty of model structure (0.012 ± 0.001 °C yr −1 ), diagnosed from the range of response between different models, normalized to the same forcing. In addition, the loss rate of near-surface permafrost area, defined as total area where the maximum seasonal active-layer thickness (ALT) is less than 3 m loss rate, is found to be significantly correlated with the magnitude of the trends of T s at 1 m depth across the models ( R = −0.85, P = 0.003), but not with the initial total near-surface permafrost area ( R = −0.30, P = 0.438). The sensitivity of the total boreal near-surface ... |
format |
Article in Journal/Newspaper |
author |
S. Peng P. Ciais G. Krinner T. Wang I. Gouttevin A. D. McGuire D. Lawrence E. Burke X. Chen B. Decharme C. Koven A. MacDougall A. Rinke K. Saito W. Zhang R. Alkama T. J. Bohn C. Delire T. Hajima D. Ji D. P. Lettenmaier P. A. Miller J. C. Moore B. Smith T. Sueyoshi |
author_facet |
S. Peng P. Ciais G. Krinner T. Wang I. Gouttevin A. D. McGuire D. Lawrence E. Burke X. Chen B. Decharme C. Koven A. MacDougall A. Rinke K. Saito W. Zhang R. Alkama T. J. Bohn C. Delire T. Hajima D. Ji D. P. Lettenmaier P. A. Miller J. C. Moore B. Smith T. Sueyoshi |
author_sort |
S. Peng |
title |
Simulated high-latitude soil thermal dynamics during the past 4 decades |
title_short |
Simulated high-latitude soil thermal dynamics during the past 4 decades |
title_full |
Simulated high-latitude soil thermal dynamics during the past 4 decades |
title_fullStr |
Simulated high-latitude soil thermal dynamics during the past 4 decades |
title_full_unstemmed |
Simulated high-latitude soil thermal dynamics during the past 4 decades |
title_sort |
simulated high-latitude soil thermal dynamics during the past 4 decades |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-179-2016 https://doaj.org/article/f596bdf8d6b74650ac9b35db103c6bcb |
genre |
Active layer thickness permafrost The Cryosphere |
genre_facet |
Active layer thickness permafrost The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 1, Pp 179-192 (2016) |
op_relation |
http://www.the-cryosphere.net/10/179/2016/tc-10-179-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-179-2016 https://doaj.org/article/f596bdf8d6b74650ac9b35db103c6bcb |
op_doi |
https://doi.org/10.5194/tc-10-179-2016 |
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The Cryosphere |
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10 |
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1 |
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179 |
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192 |
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1766335015769079808 |