Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska
To determine the influence of fire and thermokarst in a boreal landscape, we investigated peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and...
Main Authors: | , , , , , |
---|---|
Format: | Other/Unknown Material |
Language: | English |
Published: |
PANGAEA
2008
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.817460 https://doi.org/10.1594/PANGAEA.817460 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817460 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.817460 2024-09-09T19:48:07+00:00 Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska Myers-Smith, Isla H Harden, J W Wilmking, Martin Fuller, C C McGuire, A David Chapin, F Stuart MEDIAN LATITUDE: 64.640745 * MEDIAN LONGITUDE: -148.333500 * SOUTH-BOUND LATITUDE: 64.640620 * WEST-BOUND LONGITUDE: -148.333700 * NORTH-BOUND LATITUDE: 64.640870 * EAST-BOUND LONGITUDE: -148.333300 * DATE/TIME START: 2001-07-01T00:00:00 * DATE/TIME END: 2004-08-30T00:00:00 2008 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.817460 https://doi.org/10.1594/PANGAEA.817460 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.817460 https://doi.org/10.1594/PANGAEA.817460 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Myers-Smith, Isla H; Harden, J W; Wilmking, Martin; Fuller, C C; McGuire, A David; Chapin, F Stuart (2008): Wetland succession in a permafrost collapse: interactions between fire and thermokarst. Biogeosciences, 5(5), 1273-1286, https://doi.org/10.5194/bg-5-1273-2008 Alaska USA International Polar Year (2007-2008) IPY PERM Sampling permafrost Tanana_R-plain dataset publication series 2008 ftpangaea https://doi.org/10.1594/PANGAEA.81746010.5194/bg-5-1273-2008 2024-07-24T02:31:21Z To determine the influence of fire and thermokarst in a boreal landscape, we investigated peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and nitrogen content of the peat profile indicate ~600 years of vegetation succession with a transition from a terrestrial forest to a sedge-dominated wetland over 100 years ago, and to a Sphagnum-dominated peatland in approximately 1970. The shift from sedge to Sphagnum, and a decrease in the detrended tree-ring width index of black spruce trees adjacent to the collapse coincided with an increase in the growing season temperature record from Fairbanks. This concurrent wetland succession and reduced growth of black spruce trees indicates a step-wise ecosystem-level response to a change in regional climate. In 2001, fire was observed coincident with permafrost collapse and resulted in lateral expansion of the peatland. These observations and the peat profile suggest that future warming and/or increased fire disturbance could promote permafrost degradation, peatland expansion, and increase carbon storage across this landscape; however, the development of drought conditions could reduce the success of both black spruce and Sphagnum, and potentially decrease the long-term ecosystem carbon storage. Other/Unknown Material International Polar Year IPY permafrost Thermokarst Alaska PANGAEA - Data Publisher for Earth & Environmental Science Fairbanks ENVELOPE(-148.333700,-148.333300,64.640870,64.640620) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Alaska USA International Polar Year (2007-2008) IPY PERM Sampling permafrost Tanana_R-plain |
spellingShingle |
Alaska USA International Polar Year (2007-2008) IPY PERM Sampling permafrost Tanana_R-plain Myers-Smith, Isla H Harden, J W Wilmking, Martin Fuller, C C McGuire, A David Chapin, F Stuart Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
topic_facet |
Alaska USA International Polar Year (2007-2008) IPY PERM Sampling permafrost Tanana_R-plain |
description |
To determine the influence of fire and thermokarst in a boreal landscape, we investigated peat cores within and adjacent to a permafrost collapse feature on the Tanana River Floodplain of Interior Alaska. Radioisotope dating, diatom assemblages, plant macrofossils, charcoal fragments, and carbon and nitrogen content of the peat profile indicate ~600 years of vegetation succession with a transition from a terrestrial forest to a sedge-dominated wetland over 100 years ago, and to a Sphagnum-dominated peatland in approximately 1970. The shift from sedge to Sphagnum, and a decrease in the detrended tree-ring width index of black spruce trees adjacent to the collapse coincided with an increase in the growing season temperature record from Fairbanks. This concurrent wetland succession and reduced growth of black spruce trees indicates a step-wise ecosystem-level response to a change in regional climate. In 2001, fire was observed coincident with permafrost collapse and resulted in lateral expansion of the peatland. These observations and the peat profile suggest that future warming and/or increased fire disturbance could promote permafrost degradation, peatland expansion, and increase carbon storage across this landscape; however, the development of drought conditions could reduce the success of both black spruce and Sphagnum, and potentially decrease the long-term ecosystem carbon storage. |
format |
Other/Unknown Material |
author |
Myers-Smith, Isla H Harden, J W Wilmking, Martin Fuller, C C McGuire, A David Chapin, F Stuart |
author_facet |
Myers-Smith, Isla H Harden, J W Wilmking, Martin Fuller, C C McGuire, A David Chapin, F Stuart |
author_sort |
Myers-Smith, Isla H |
title |
Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
title_short |
Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
title_full |
Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
title_fullStr |
Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
title_full_unstemmed |
Ages and isotopic signatures of peat cores from a boreal landscape, Interior Alaska |
title_sort |
ages and isotopic signatures of peat cores from a boreal landscape, interior alaska |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.817460 https://doi.org/10.1594/PANGAEA.817460 |
op_coverage |
MEDIAN LATITUDE: 64.640745 * MEDIAN LONGITUDE: -148.333500 * SOUTH-BOUND LATITUDE: 64.640620 * WEST-BOUND LONGITUDE: -148.333700 * NORTH-BOUND LATITUDE: 64.640870 * EAST-BOUND LONGITUDE: -148.333300 * DATE/TIME START: 2001-07-01T00:00:00 * DATE/TIME END: 2004-08-30T00:00:00 |
long_lat |
ENVELOPE(-148.333700,-148.333300,64.640870,64.640620) |
geographic |
Fairbanks |
geographic_facet |
Fairbanks |
genre |
International Polar Year IPY permafrost Thermokarst Alaska |
genre_facet |
International Polar Year IPY permafrost Thermokarst Alaska |
op_source |
Supplement to: Myers-Smith, Isla H; Harden, J W; Wilmking, Martin; Fuller, C C; McGuire, A David; Chapin, F Stuart (2008): Wetland succession in a permafrost collapse: interactions between fire and thermokarst. Biogeosciences, 5(5), 1273-1286, https://doi.org/10.5194/bg-5-1273-2008 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.817460 https://doi.org/10.1594/PANGAEA.817460 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.81746010.5194/bg-5-1273-2008 |
_version_ |
1809917490123243520 |