Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north
© The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Global and Planetary Change 142 (2016): 28-40, doi:10.1016/j.gloplacha.2016.04.011. In the circumpolar north (4...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , , , , |
Format: | Report |
Language: | English |
Published: |
2016
|
Subjects: | |
Online Access: | https://hdl.handle.net/1912/8231 |
id |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8231 |
---|---|
record_format |
openpolar |
spelling |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/8231 2023-05-15T13:03:26+02:00 Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north Jiang, Yueyang Zhuang, Qianlai Sitch, Stephen O'Donnell, Jonathan A. Kicklighter, David W. Sokolov, Andrei P. Melillo, Jerry M. 2016-04-19 https://hdl.handle.net/1912/8231 en eng https://doi.org/10.1016/j.gloplacha.2016.04.011 https://hdl.handle.net/1912/8231 Attribution-NonCommercial-NoDerivs 3.0 United States http://creativecommons.org/licenses/by-nc-nd/3.0/us/ CC-BY-NC-ND Soil thermal regime Permafrost degradation Active layer Climate warming Carbon budget Preprint 2016 ftwhoas https://doi.org/10.1016/j.gloplacha.2016.04.011 2022-05-28T22:59:39Z © The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Global and Planetary Change 142 (2016): 28-40, doi:10.1016/j.gloplacha.2016.04.011. In the circumpolar north (45-90°N), permafrost plays an important role in vegetation and carbon (C) dynamics. Permafrost thawing has been accelerated by the warming climate and exerts a positive feedback to climate through increasing soil C release to the atmosphere. To evaluate the influence of permafrost on C dynamics, changes in soil temperature profiles should be considered in global C models. This study incorporates a sophisticated soil thermal model (STM) into a dynamic global vegetation model (LPJ-DGVM) to improve simulations of changes in soil temperature profiles from the ground surface to 3 m depth, and its impacts on C pools and fluxes during the 20th and 21st centuries.With cooler simulated soil temperatures during the summer, LPJ-STM estimates ~0.4 Pg C yr-1 lower present-day heterotrophic respiration but ~0.5 Pg C yr-1 higher net primary production than the original LPJ model resulting in an additional 0.8 to 1.0 Pg C yr-1 being sequestered in circumpolar ecosystems. Under a suite of projected warming scenarios, we show that the increasing active layer thickness results in the mobilization of permafrost C, which contributes to a more rapid increase in heterotrophic respiration in LPJ-STM compared to the stand-alone LPJ model. Except under the extreme warming conditions, increases in plant production due to warming and rising CO2, overwhelm the enhanced ecosystem respiration so that both boreal forest and arctic tundra ecosystems remain a net C sink over the 21st century. This study highlights the importance of considering changes in the soil thermal regime when quantifying the C budget in the circumpolar north. This research is supported by funded projects to Q. Z. National Science Foundation (NSF- 1028291 and NSF- 0919331), the ... Report Active layer thickness Arctic permafrost Tundra Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Arctic Global and Planetary Change 142 28 40 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Soil thermal regime Permafrost degradation Active layer Climate warming Carbon budget |
spellingShingle |
Soil thermal regime Permafrost degradation Active layer Climate warming Carbon budget Jiang, Yueyang Zhuang, Qianlai Sitch, Stephen O'Donnell, Jonathan A. Kicklighter, David W. Sokolov, Andrei P. Melillo, Jerry M. Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
topic_facet |
Soil thermal regime Permafrost degradation Active layer Climate warming Carbon budget |
description |
© The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Global and Planetary Change 142 (2016): 28-40, doi:10.1016/j.gloplacha.2016.04.011. In the circumpolar north (45-90°N), permafrost plays an important role in vegetation and carbon (C) dynamics. Permafrost thawing has been accelerated by the warming climate and exerts a positive feedback to climate through increasing soil C release to the atmosphere. To evaluate the influence of permafrost on C dynamics, changes in soil temperature profiles should be considered in global C models. This study incorporates a sophisticated soil thermal model (STM) into a dynamic global vegetation model (LPJ-DGVM) to improve simulations of changes in soil temperature profiles from the ground surface to 3 m depth, and its impacts on C pools and fluxes during the 20th and 21st centuries.With cooler simulated soil temperatures during the summer, LPJ-STM estimates ~0.4 Pg C yr-1 lower present-day heterotrophic respiration but ~0.5 Pg C yr-1 higher net primary production than the original LPJ model resulting in an additional 0.8 to 1.0 Pg C yr-1 being sequestered in circumpolar ecosystems. Under a suite of projected warming scenarios, we show that the increasing active layer thickness results in the mobilization of permafrost C, which contributes to a more rapid increase in heterotrophic respiration in LPJ-STM compared to the stand-alone LPJ model. Except under the extreme warming conditions, increases in plant production due to warming and rising CO2, overwhelm the enhanced ecosystem respiration so that both boreal forest and arctic tundra ecosystems remain a net C sink over the 21st century. This study highlights the importance of considering changes in the soil thermal regime when quantifying the C budget in the circumpolar north. This research is supported by funded projects to Q. Z. National Science Foundation (NSF- 1028291 and NSF- 0919331), the ... |
format |
Report |
author |
Jiang, Yueyang Zhuang, Qianlai Sitch, Stephen O'Donnell, Jonathan A. Kicklighter, David W. Sokolov, Andrei P. Melillo, Jerry M. |
author_facet |
Jiang, Yueyang Zhuang, Qianlai Sitch, Stephen O'Donnell, Jonathan A. Kicklighter, David W. Sokolov, Andrei P. Melillo, Jerry M. |
author_sort |
Jiang, Yueyang |
title |
Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
title_short |
Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
title_full |
Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
title_fullStr |
Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
title_full_unstemmed |
Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
title_sort |
importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north |
publishDate |
2016 |
url |
https://hdl.handle.net/1912/8231 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Active layer thickness Arctic permafrost Tundra |
genre_facet |
Active layer thickness Arctic permafrost Tundra |
op_relation |
https://doi.org/10.1016/j.gloplacha.2016.04.011 https://hdl.handle.net/1912/8231 |
op_rights |
Attribution-NonCommercial-NoDerivs 3.0 United States http://creativecommons.org/licenses/by-nc-nd/3.0/us/ |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1016/j.gloplacha.2016.04.011 |
container_title |
Global and Planetary Change |
container_volume |
142 |
container_start_page |
28 |
op_container_end_page |
40 |
_version_ |
1766336585104621568 |