Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska
[1] Climate warming and permafrost degradation at high latitudes will likely impact watershed hydrology, and consequently, alter the concentration and character of dissolved organic carbon (DOC) in northern rivers. We examined seasonal variation of DOC chemistry in 16 streams of the Yukon River basi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.419.2820 2023-05-15T17:57:32+02:00 Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska Jonathan A. O’donnell George R. Aiken Evan S. Kane Jeremy B. Jones The Pennsylvania State University CiteSeerX Archives 2010 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.2820 http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.2820 http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf text 2010 ftciteseerx 2016-01-08T03:52:09Z [1] Climate warming and permafrost degradation at high latitudes will likely impact watershed hydrology, and consequently, alter the concentration and character of dissolved organic carbon (DOC) in northern rivers. We examined seasonal variation of DOC chemistry in 16 streams of the Yukon River basin, Alaska. Our primary objective was to evaluate the relationship between source water (shallow versus deep groundwater flow paths) and DOC chemical composition. Using base cation chemistry and principal component analysis, we observed high contributions of deep groundwater to glacial and clearwater streams, whereas blackwater streams received larger contributions from shallow groundwater sources. DOC concentration and specific ultraviolet absorbance peaked during spring snowmelt in all streams, and were consistently higher in blackwater streams than in glacial and clearwater streams. The hydrophobic acid fraction of DOC dominated across all streams and seasons, comprising between 35 % and 56 % of total DOC. The hydrophilic acid fraction of DOC was more prominent in glacial (23 % ± 3%) and clearwater streams (19 % ± 1%) than in blackwater streams (16 % ± 1%), and was enriched during winter base flow (29 % ± 1%) relative to snowmelt and summer base flow. We observed that an increase in the contribution of deep groundwater to streamflow resulted in decreased DOC concentration, aromaticity, and DOC‐to‐dissolved organic nitrogen ratio, and an increase in the proportion of hydrophilic acids relative to hydrophobic acids. Our findings suggest that future permafrost degradation and higher contributions of groundwater to streamflow may result in a higher fraction of labile DOM in streams of the Yukon basin. Text permafrost Yukon Basin Yukon river Alaska Yukon Unknown Yukon Yukon Basin ENVELOPE(-135.000,-135.000,64.282,64.282) |
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[1] Climate warming and permafrost degradation at high latitudes will likely impact watershed hydrology, and consequently, alter the concentration and character of dissolved organic carbon (DOC) in northern rivers. We examined seasonal variation of DOC chemistry in 16 streams of the Yukon River basin, Alaska. Our primary objective was to evaluate the relationship between source water (shallow versus deep groundwater flow paths) and DOC chemical composition. Using base cation chemistry and principal component analysis, we observed high contributions of deep groundwater to glacial and clearwater streams, whereas blackwater streams received larger contributions from shallow groundwater sources. DOC concentration and specific ultraviolet absorbance peaked during spring snowmelt in all streams, and were consistently higher in blackwater streams than in glacial and clearwater streams. The hydrophobic acid fraction of DOC dominated across all streams and seasons, comprising between 35 % and 56 % of total DOC. The hydrophilic acid fraction of DOC was more prominent in glacial (23 % ± 3%) and clearwater streams (19 % ± 1%) than in blackwater streams (16 % ± 1%), and was enriched during winter base flow (29 % ± 1%) relative to snowmelt and summer base flow. We observed that an increase in the contribution of deep groundwater to streamflow resulted in decreased DOC concentration, aromaticity, and DOC‐to‐dissolved organic nitrogen ratio, and an increase in the proportion of hydrophilic acids relative to hydrophobic acids. Our findings suggest that future permafrost degradation and higher contributions of groundwater to streamflow may result in a higher fraction of labile DOM in streams of the Yukon basin. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Jonathan A. O’donnell George R. Aiken Evan S. Kane Jeremy B. Jones |
spellingShingle |
Jonathan A. O’donnell George R. Aiken Evan S. Kane Jeremy B. Jones Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
author_facet |
Jonathan A. O’donnell George R. Aiken Evan S. Kane Jeremy B. Jones |
author_sort |
Jonathan A. O’donnell |
title |
Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
title_short |
Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
title_full |
Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
title_fullStr |
Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
title_full_unstemmed |
Source water controls on the character and origin of dissolved organic matter in streams of the Yukon River basin, Alaska |
title_sort |
source water controls on the character and origin of dissolved organic matter in streams of the yukon river basin, alaska |
publishDate |
2010 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.2820 http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf |
long_lat |
ENVELOPE(-135.000,-135.000,64.282,64.282) |
geographic |
Yukon Yukon Basin |
geographic_facet |
Yukon Yukon Basin |
genre |
permafrost Yukon Basin Yukon river Alaska Yukon |
genre_facet |
permafrost Yukon Basin Yukon river Alaska Yukon |
op_source |
http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.419.2820 http://www.lter.uaf.edu/pdf/1498_O'Donnell_Aiken_2010.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766165991435272192 |