Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes
Increasing global temperatures are causing widespread changes in the Arctic, including permafrost thawing and altered freshwater inputs and trace metal and carbon fluxes into the ocean and atmosphere. Changes in the permafrost active layer thickness can affect subsurface water flow-paths and water-r...
Published in: | Geochimica et Cosmochimica Acta |
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2018
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Online Access: | http://hdl.handle.net/2078.1/206940 https://doi.org/10.1016/j.gca.2018.10.024 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:206940 2024-05-12T07:52:09+00:00 Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes Murphy, Melissa J. Porcelli, Don Pogge von Strandmann, Philip A.E. Hirst, Catherine Kutscher, Liselott Katchinoff, Joachim A. Mörth, Carl-Magnus Maximov, Trofim Andersson, Per S. UCL - SST/ELI/ELIE - Environmental Sciences 2018 http://hdl.handle.net/2078.1/206940 https://doi.org/10.1016/j.gca.2018.10.024 eng eng Elsevier BV boreal:206940 http://hdl.handle.net/2078.1/206940 doi:10.1016/j.gca.2018.10.024 urn:ISSN:0016-7037 info:eu-repo/semantics/openAccess Geochimica et Cosmochimica Acta, Vol. 245, p. 154-171 (2018) Geochemistry and Petrology Arctic Water-rock interactions Freeze-thaw Hydrological cycle Carbon cycle info:eu-repo/semantics/article 2018 ftunivlouvain https://doi.org/10.1016/j.gca.2018.10.024 2024-04-17T16:51:47Z Increasing global temperatures are causing widespread changes in the Arctic, including permafrost thawing and altered freshwater inputs and trace metal and carbon fluxes into the ocean and atmosphere. Changes in the permafrost active layer thickness can affect subsurface water flow-paths and water-rock interaction times, and hence weathering processes. Riverine lithium isotope ratios (reported as d7Li) are tracers of silicate weathering that are unaffected by biological uptake, redox, carbonate weathering and primary lithology. Here we use Li isotopes to examine silicate weathering processes in one of the largest Russian Arctic rivers: the Lena River in eastern Siberia. The Lena River watershed is a large multi-lithological catchment, underlain by continuous ermafrost. An extensive dataset of dissolved Li isotopic compositions of waters from the Lena River main channel, two main tributaries (the Aldan and Viliui Rivers) and a range of smaller subributaries are presented from the post-spring flood/early-summer period at the onset of active layer development and enhanced water-rock interactions. The Lena River main channel (average d7Lidiss _ 19‰) has a slightly lower isotopic composition than the mean global average of 23‰ (Huh et al., 1998a). The greatest range of [Li] and d7Lidiss are observed in catchments draining the south-facing slopes of the Verkhoyansk Mountain Range. South-facing slopes in high-latitude, permafrost-dominated regions are typically characterized by increased summer insolation and higher daytime temperatures relative to other slope aspects. The increased solar radiation on south-facing catchments promotes repeated freeze-thaw cycles, and contributes to more rapid melting of snow cover, warmer soils, and increased active layer thaw depths. The greater variability in d7Li and [Li] in the south-facing rivers likely reflect the greater infiltration of melt water and enhanced water-rock interactions within the active layer. A similar magnitude of isotopic fractionation is observed between ... Article in Journal/Newspaper Active layer thickness Arctic lena river permafrost Siberia DIAL@UCLouvain (Université catholique de Louvain) Arctic Verkhoyansk ENVELOPE(133.400,133.400,67.544,67.544) Aldan ENVELOPE(129.546,129.546,63.447,63.447) Geochimica et Cosmochimica Acta 245 154 171 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
Geochemistry and Petrology Arctic Water-rock interactions Freeze-thaw Hydrological cycle Carbon cycle |
spellingShingle |
Geochemistry and Petrology Arctic Water-rock interactions Freeze-thaw Hydrological cycle Carbon cycle Murphy, Melissa J. Porcelli, Don Pogge von Strandmann, Philip A.E. Hirst, Catherine Kutscher, Liselott Katchinoff, Joachim A. Mörth, Carl-Magnus Maximov, Trofim Andersson, Per S. Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
topic_facet |
Geochemistry and Petrology Arctic Water-rock interactions Freeze-thaw Hydrological cycle Carbon cycle |
description |
Increasing global temperatures are causing widespread changes in the Arctic, including permafrost thawing and altered freshwater inputs and trace metal and carbon fluxes into the ocean and atmosphere. Changes in the permafrost active layer thickness can affect subsurface water flow-paths and water-rock interaction times, and hence weathering processes. Riverine lithium isotope ratios (reported as d7Li) are tracers of silicate weathering that are unaffected by biological uptake, redox, carbonate weathering and primary lithology. Here we use Li isotopes to examine silicate weathering processes in one of the largest Russian Arctic rivers: the Lena River in eastern Siberia. The Lena River watershed is a large multi-lithological catchment, underlain by continuous ermafrost. An extensive dataset of dissolved Li isotopic compositions of waters from the Lena River main channel, two main tributaries (the Aldan and Viliui Rivers) and a range of smaller subributaries are presented from the post-spring flood/early-summer period at the onset of active layer development and enhanced water-rock interactions. The Lena River main channel (average d7Lidiss _ 19‰) has a slightly lower isotopic composition than the mean global average of 23‰ (Huh et al., 1998a). The greatest range of [Li] and d7Lidiss are observed in catchments draining the south-facing slopes of the Verkhoyansk Mountain Range. South-facing slopes in high-latitude, permafrost-dominated regions are typically characterized by increased summer insolation and higher daytime temperatures relative to other slope aspects. The increased solar radiation on south-facing catchments promotes repeated freeze-thaw cycles, and contributes to more rapid melting of snow cover, warmer soils, and increased active layer thaw depths. The greater variability in d7Li and [Li] in the south-facing rivers likely reflect the greater infiltration of melt water and enhanced water-rock interactions within the active layer. A similar magnitude of isotopic fractionation is observed between ... |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Murphy, Melissa J. Porcelli, Don Pogge von Strandmann, Philip A.E. Hirst, Catherine Kutscher, Liselott Katchinoff, Joachim A. Mörth, Carl-Magnus Maximov, Trofim Andersson, Per S. |
author_facet |
Murphy, Melissa J. Porcelli, Don Pogge von Strandmann, Philip A.E. Hirst, Catherine Kutscher, Liselott Katchinoff, Joachim A. Mörth, Carl-Magnus Maximov, Trofim Andersson, Per S. |
author_sort |
Murphy, Melissa J. |
title |
Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
title_short |
Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
title_full |
Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
title_fullStr |
Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
title_full_unstemmed |
Tracing silicate weathering processes in the permafrost-dominated Lena River watershed using lithium isotopes |
title_sort |
tracing silicate weathering processes in the permafrost-dominated lena river watershed using lithium isotopes |
publisher |
Elsevier BV |
publishDate |
2018 |
url |
http://hdl.handle.net/2078.1/206940 https://doi.org/10.1016/j.gca.2018.10.024 |
long_lat |
ENVELOPE(133.400,133.400,67.544,67.544) ENVELOPE(129.546,129.546,63.447,63.447) |
geographic |
Arctic Verkhoyansk Aldan |
geographic_facet |
Arctic Verkhoyansk Aldan |
genre |
Active layer thickness Arctic lena river permafrost Siberia |
genre_facet |
Active layer thickness Arctic lena river permafrost Siberia |
op_source |
Geochimica et Cosmochimica Acta, Vol. 245, p. 154-171 (2018) |
op_relation |
boreal:206940 http://hdl.handle.net/2078.1/206940 doi:10.1016/j.gca.2018.10.024 urn:ISSN:0016-7037 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.gca.2018.10.024 |
container_title |
Geochimica et Cosmochimica Acta |
container_volume |
245 |
container_start_page |
154 |
op_container_end_page |
171 |
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1798841572237770752 |