Effects of excess ground ice on projections of permafrost in a warming climate
In permafrost soils, ‘excess ice’, also referred to as ground ice, exists in amounts exceeding soil porosity in forms such as ice lenses and wedges. Here, we incorporate a simple representation of excess ice in the Community Land Model (CLM4.5) to investigate how excess ice affects projected permafr...
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Online Access: | https://doi.org/10.1088/1748-9326/9/12/124006 https://doaj.org/article/7a1e0c6195c444d095315e189ba826bc |
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ftdoajarticles:oai:doaj.org/article:7a1e0c6195c444d095315e189ba826bc 2023-09-05T13:17:31+02:00 Effects of excess ground ice on projections of permafrost in a warming climate Hanna Lee Sean C Swenson Andrew G Slater David M Lawrence 2014-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/9/12/124006 https://doaj.org/article/7a1e0c6195c444d095315e189ba826bc EN eng IOP Publishing https://doi.org/10.1088/1748-9326/9/12/124006 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/9/12/124006 1748-9326 https://doaj.org/article/7a1e0c6195c444d095315e189ba826bc Environmental Research Letters, Vol 9, Iss 12, p 124006 (2014) Earth system model development thermokarst Community Land Model Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2014 ftdoajarticles https://doi.org/10.1088/1748-9326/9/12/124006 2023-08-13T00:37:25Z In permafrost soils, ‘excess ice’, also referred to as ground ice, exists in amounts exceeding soil porosity in forms such as ice lenses and wedges. Here, we incorporate a simple representation of excess ice in the Community Land Model (CLM4.5) to investigate how excess ice affects projected permafrost thaw and associated hydrologic responses. We initialize spatially explicit excess ice obtained from the Circum-Arctic Map of Permafrost and Ground-Ice Conditions. The excess ice in the model acts to slightly reduce projected soil warming by about 0.35 °C by 2100 in a high greenhouse gas emissions scenario. The presence of excess ice slows permafrost thaw at a given location with about a 10 year delay in permafrost thaw at 3 m depth at most high excess ice locations. The soil moisture response to excess ice melt is transient and depends largely on the timing of thaw with wetter/saturated soil moisture conditions persisting slightly longer due to delayed post-thaw drainage. Based on the model projections of excess ice melt, we can estimate spatially explicit gridcell mean surface subsidence with values ranging up to 0.5 m by 2100 depending on the initial excess ice content and the extent of melt. Article in Journal/Newspaper Arctic Ice permafrost Thermokarst wedge* Directory of Open Access Journals: DOAJ Articles Arctic Environmental Research Letters 9 12 124006 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Earth system model development thermokarst Community Land Model Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
Earth system model development thermokarst Community Land Model Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Hanna Lee Sean C Swenson Andrew G Slater David M Lawrence Effects of excess ground ice on projections of permafrost in a warming climate |
topic_facet |
Earth system model development thermokarst Community Land Model Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
In permafrost soils, ‘excess ice’, also referred to as ground ice, exists in amounts exceeding soil porosity in forms such as ice lenses and wedges. Here, we incorporate a simple representation of excess ice in the Community Land Model (CLM4.5) to investigate how excess ice affects projected permafrost thaw and associated hydrologic responses. We initialize spatially explicit excess ice obtained from the Circum-Arctic Map of Permafrost and Ground-Ice Conditions. The excess ice in the model acts to slightly reduce projected soil warming by about 0.35 °C by 2100 in a high greenhouse gas emissions scenario. The presence of excess ice slows permafrost thaw at a given location with about a 10 year delay in permafrost thaw at 3 m depth at most high excess ice locations. The soil moisture response to excess ice melt is transient and depends largely on the timing of thaw with wetter/saturated soil moisture conditions persisting slightly longer due to delayed post-thaw drainage. Based on the model projections of excess ice melt, we can estimate spatially explicit gridcell mean surface subsidence with values ranging up to 0.5 m by 2100 depending on the initial excess ice content and the extent of melt. |
format |
Article in Journal/Newspaper |
author |
Hanna Lee Sean C Swenson Andrew G Slater David M Lawrence |
author_facet |
Hanna Lee Sean C Swenson Andrew G Slater David M Lawrence |
author_sort |
Hanna Lee |
title |
Effects of excess ground ice on projections of permafrost in a warming climate |
title_short |
Effects of excess ground ice on projections of permafrost in a warming climate |
title_full |
Effects of excess ground ice on projections of permafrost in a warming climate |
title_fullStr |
Effects of excess ground ice on projections of permafrost in a warming climate |
title_full_unstemmed |
Effects of excess ground ice on projections of permafrost in a warming climate |
title_sort |
effects of excess ground ice on projections of permafrost in a warming climate |
publisher |
IOP Publishing |
publishDate |
2014 |
url |
https://doi.org/10.1088/1748-9326/9/12/124006 https://doaj.org/article/7a1e0c6195c444d095315e189ba826bc |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst wedge* |
genre_facet |
Arctic Ice permafrost Thermokarst wedge* |
op_source |
Environmental Research Letters, Vol 9, Iss 12, p 124006 (2014) |
op_relation |
https://doi.org/10.1088/1748-9326/9/12/124006 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/9/12/124006 1748-9326 https://doaj.org/article/7a1e0c6195c444d095315e189ba826bc |
op_doi |
https://doi.org/10.1088/1748-9326/9/12/124006 |
container_title |
Environmental Research Letters |
container_volume |
9 |
container_issue |
12 |
container_start_page |
124006 |
_version_ |
1776198655949144064 |