Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica
Stream channels in the McMurdo Dry Valleys are characteristically wide, incised, and stable. At typical flows, streams occupy a fraction of the oversized channels, providing habitat for algal mats. In January 2012, we discovered substantial channel erosion and subsurface thermomechanical erosion und...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00013777 2023-05-15T13:34:48+02:00 Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica Gooseff, Michael N. Van Horn, David Sudman, Zachary McKnight, Diane M. Welch, Kathleene A. Lyons, William B. 2016-03 electronic https://doi.org/10.5194/bg-13-1723-2016 https://noa.gwlb.de/receive/cop_mods_00013777 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013733/bg-13-1723-2016.pdf https://bg.copernicus.org/articles/13/1723/2016/bg-13-1723-2016.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-1723-2016 https://noa.gwlb.de/receive/cop_mods_00013777 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013733/bg-13-1723-2016.pdf https://bg.copernicus.org/articles/13/1723/2016/bg-13-1723-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/bg-13-1723-2016 2022-02-08T22:55:28Z Stream channels in the McMurdo Dry Valleys are characteristically wide, incised, and stable. At typical flows, streams occupy a fraction of the oversized channels, providing habitat for algal mats. In January 2012, we discovered substantial channel erosion and subsurface thermomechanical erosion undercutting banks of the Crescent Stream. We sampled stream water along the impacted reach and compared concentrations of solutes to the long-term data from this stream ( ∼ 20 years of monitoring). Thermokarst-impacted stream water demonstrated higher electrical conductivity, and concentrations of chloride, sulfate, sodium, and nitrate than the long-term medians. These results suggest that this mode of lateral permafrost degradation may substantially impact stream solute loads and potentially fertilize stream and lake ecosystems. The potential for sediment to scour or bury stream algal mats is yet to be determined, though it may offset impacts of associated increased nutrient loads to streams. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys permafrost Thermokarst Niedersächsisches Online-Archiv NOA Crescent Stream ENVELOPE(163.183,163.183,-77.617,-77.617) McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Biogeosciences 13 6 1723 1732 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Gooseff, Michael N. Van Horn, David Sudman, Zachary McKnight, Diane M. Welch, Kathleene A. Lyons, William B. Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
Stream channels in the McMurdo Dry Valleys are characteristically wide, incised, and stable. At typical flows, streams occupy a fraction of the oversized channels, providing habitat for algal mats. In January 2012, we discovered substantial channel erosion and subsurface thermomechanical erosion undercutting banks of the Crescent Stream. We sampled stream water along the impacted reach and compared concentrations of solutes to the long-term data from this stream ( ∼ 20 years of monitoring). Thermokarst-impacted stream water demonstrated higher electrical conductivity, and concentrations of chloride, sulfate, sodium, and nitrate than the long-term medians. These results suggest that this mode of lateral permafrost degradation may substantially impact stream solute loads and potentially fertilize stream and lake ecosystems. The potential for sediment to scour or bury stream algal mats is yet to be determined, though it may offset impacts of associated increased nutrient loads to streams. |
format |
Article in Journal/Newspaper |
author |
Gooseff, Michael N. Van Horn, David Sudman, Zachary McKnight, Diane M. Welch, Kathleene A. Lyons, William B. |
author_facet |
Gooseff, Michael N. Van Horn, David Sudman, Zachary McKnight, Diane M. Welch, Kathleene A. Lyons, William B. |
author_sort |
Gooseff, Michael N. |
title |
Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
title_short |
Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
title_full |
Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
title_fullStr |
Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
title_full_unstemmed |
Stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in Taylor Valley, Antarctica |
title_sort |
stream biogeochemical and suspended sediment responses to permafrost degradation in stream banks in taylor valley, antarctica |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/bg-13-1723-2016 https://noa.gwlb.de/receive/cop_mods_00013777 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013733/bg-13-1723-2016.pdf https://bg.copernicus.org/articles/13/1723/2016/bg-13-1723-2016.pdf |
long_lat |
ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Crescent Stream McMurdo Dry Valleys Taylor Valley |
geographic_facet |
Crescent Stream McMurdo Dry Valleys Taylor Valley |
genre |
Antarc* Antarctica McMurdo Dry Valleys permafrost Thermokarst |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys permafrost Thermokarst |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-13-1723-2016 https://noa.gwlb.de/receive/cop_mods_00013777 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00013733/bg-13-1723-2016.pdf https://bg.copernicus.org/articles/13/1723/2016/bg-13-1723-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/bg-13-1723-2016 |
container_title |
Biogeosciences |
container_volume |
13 |
container_issue |
6 |
container_start_page |
1723 |
op_container_end_page |
1732 |
_version_ |
1766057730697592832 |