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...
Main Authors: | , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
CU Scholar
2016
|
Subjects: | |
Online Access: | https://scholar.colorado.edu/cven_facpapers/5 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1002&context=cven_facpapers |
id |
ftunicolboulder:oai:scholar.colorado.edu:cven_facpapers-1002 |
---|---|
record_format |
openpolar |
spelling |
ftunicolboulder:oai:scholar.colorado.edu:cven_facpapers-1002 2023-05-15T13:49:40+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. 2016-01-01T08:00:00Z application/pdf https://scholar.colorado.edu/cven_facpapers/5 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1002&context=cven_facpapers unknown CU Scholar https://scholar.colorado.edu/cven_facpapers/5 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1002&context=cven_facpapers Civil Engineering Faculty Contributions glacial meltwater streams impact geosciences multidisciplinary canada dissolved organic-carbon mackenzie delta region water chemistry transient storage hyporheic exchange mcmurdo dry valleys text 2016 ftunicolboulder 2018-10-07T09:06:44Z 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. Text Antarc* Antarctica Mackenzie Delta McMurdo Dry Valleys permafrost Thermokarst University of Colorado, Boulder: CU Scholar McMurdo Dry Valleys Canada Mackenzie Delta ENVELOPE(-136.672,-136.672,68.833,68.833) Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Crescent Stream ENVELOPE(163.183,163.183,-77.617,-77.617) |
institution |
Open Polar |
collection |
University of Colorado, Boulder: CU Scholar |
op_collection_id |
ftunicolboulder |
language |
unknown |
topic |
glacial meltwater streams impact geosciences multidisciplinary canada dissolved organic-carbon mackenzie delta region water chemistry transient storage hyporheic exchange mcmurdo dry valleys |
spellingShingle |
glacial meltwater streams impact geosciences multidisciplinary canada dissolved organic-carbon mackenzie delta region water chemistry transient storage hyporheic exchange mcmurdo dry valleys 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 |
glacial meltwater streams impact geosciences multidisciplinary canada dissolved organic-carbon mackenzie delta region water chemistry transient storage hyporheic exchange mcmurdo dry valleys |
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 |
Text |
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 |
CU Scholar |
publishDate |
2016 |
url |
https://scholar.colorado.edu/cven_facpapers/5 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1002&context=cven_facpapers |
long_lat |
ENVELOPE(-136.672,-136.672,68.833,68.833) ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(163.183,163.183,-77.617,-77.617) |
geographic |
McMurdo Dry Valleys Canada Mackenzie Delta Taylor Valley Crescent Stream |
geographic_facet |
McMurdo Dry Valleys Canada Mackenzie Delta Taylor Valley Crescent Stream |
genre |
Antarc* Antarctica Mackenzie Delta McMurdo Dry Valleys permafrost Thermokarst |
genre_facet |
Antarc* Antarctica Mackenzie Delta McMurdo Dry Valleys permafrost Thermokarst |
op_source |
Civil Engineering Faculty Contributions |
op_relation |
https://scholar.colorado.edu/cven_facpapers/5 https://scholar.colorado.edu/cgi/viewcontent.cgi?article=1002&context=cven_facpapers |
_version_ |
1766251936860864512 |