Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics Permafrost soils cover 8.6% of the Earth land area but contain 50% of the global soil organic carbon (SOC) pool, 20-25% of which may be stored in the upper 30 cm, making it highly vulnerable to changes in...
Main Authors: | , , |
---|---|
Language: | unknown |
Published: |
2018
|
Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1374443 https://www.osti.gov/biblio/1374443 https://doi.org/10.2172/1374443 |
id |
ftosti:oai:osti.gov:1374443 |
---|---|
record_format |
openpolar |
spelling |
ftosti:oai:osti.gov:1374443 2023-07-30T04:01:18+02:00 Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report Gonzalez-Meler, Miquel A. Welker, Jeffrey M. Sturchio, Neil C. 2018-11-09 application/pdf http://www.osti.gov/servlets/purl/1374443 https://www.osti.gov/biblio/1374443 https://doi.org/10.2172/1374443 unknown http://www.osti.gov/servlets/purl/1374443 https://www.osti.gov/biblio/1374443 https://doi.org/10.2172/1374443 doi:10.2172/1374443 54 ENVIRONMENTAL SCIENCES 2018 ftosti https://doi.org/10.2172/1374443 2023-07-11T09:20:09Z Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics Permafrost soils cover 8.6% of the Earth land area but contain 50% of the global soil organic carbon (SOC) pool, 20-25% of which may be stored in the upper 30 cm, making it highly vulnerable to changes in climate. Predicted warming in northern latitudes may lead to strong forcing feedbacks on the climate system. It has been shown that the C content in the active layer of cryoturbated soils can be roughly 60% higher than in non-cryoturbated ones. However other cryogenic processes can affect the Arctic soil C pool at shorter time scales. For instance, warming may lead to increases winter precipitation resulting in a deeper snow cover with consequent thermal insulation of Arctic soils. Warmer soils may elicit summer and winter decomposition rates decreasing the SOC pool. We developed multi isotope methods to measure the soil carbon effects of snow pack accumulation on Arctic SOC dynamics in a moist acidic tundra by exposing soils to experimental accumulated snow pack (using fence experiments, Toolik Lake) in order to increase soil thermal insulation. We found that carbon dynamics were not linear and transient. At the beginning of the experiment C was lost in great quantities but they were partly recovered after about two decades. Snow cover also slows the C lost from permafrost thaw but increases CH4 emissions and heterotrophic respiration. Carbon was redistributed along the soil profile and moisture rather than temperature appeared to be the factor controlling decomposability. Other/Unknown Material Arctic permafrost Tundra SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Arctic |
institution |
Open Polar |
collection |
SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
op_collection_id |
ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
spellingShingle |
54 ENVIRONMENTAL SCIENCES Gonzalez-Meler, Miquel A. Welker, Jeffrey M. Sturchio, Neil C. Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
topic_facet |
54 ENVIRONMENTAL SCIENCES |
description |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics Permafrost soils cover 8.6% of the Earth land area but contain 50% of the global soil organic carbon (SOC) pool, 20-25% of which may be stored in the upper 30 cm, making it highly vulnerable to changes in climate. Predicted warming in northern latitudes may lead to strong forcing feedbacks on the climate system. It has been shown that the C content in the active layer of cryoturbated soils can be roughly 60% higher than in non-cryoturbated ones. However other cryogenic processes can affect the Arctic soil C pool at shorter time scales. For instance, warming may lead to increases winter precipitation resulting in a deeper snow cover with consequent thermal insulation of Arctic soils. Warmer soils may elicit summer and winter decomposition rates decreasing the SOC pool. We developed multi isotope methods to measure the soil carbon effects of snow pack accumulation on Arctic SOC dynamics in a moist acidic tundra by exposing soils to experimental accumulated snow pack (using fence experiments, Toolik Lake) in order to increase soil thermal insulation. We found that carbon dynamics were not linear and transient. At the beginning of the experiment C was lost in great quantities but they were partly recovered after about two decades. Snow cover also slows the C lost from permafrost thaw but increases CH4 emissions and heterotrophic respiration. Carbon was redistributed along the soil profile and moisture rather than temperature appeared to be the factor controlling decomposability. |
author |
Gonzalez-Meler, Miquel A. Welker, Jeffrey M. Sturchio, Neil C. |
author_facet |
Gonzalez-Meler, Miquel A. Welker, Jeffrey M. Sturchio, Neil C. |
author_sort |
Gonzalez-Meler, Miquel A. |
title |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
title_short |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
title_full |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
title_fullStr |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
title_full_unstemmed |
Permafrost Thawing and Vegetation Change Effects on Cryoturbation Rates and C and CH4 Dynamics. Final Report |
title_sort |
permafrost thawing and vegetation change effects on cryoturbation rates and c and ch4 dynamics. final report |
publishDate |
2018 |
url |
http://www.osti.gov/servlets/purl/1374443 https://www.osti.gov/biblio/1374443 https://doi.org/10.2172/1374443 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost Tundra |
genre_facet |
Arctic permafrost Tundra |
op_relation |
http://www.osti.gov/servlets/purl/1374443 https://www.osti.gov/biblio/1374443 https://doi.org/10.2172/1374443 doi:10.2172/1374443 |
op_doi |
https://doi.org/10.2172/1374443 |
_version_ |
1772812048316497920 |