Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient
Dissolved organic matter (DOM) concentration and quality were examined from Arctic lakes located in three clusters across south-west (SW) Greenland, covering the regional climatic gradient: cool, wet coastal zone; dry inland interior; and cool, dry ice-marginal areas. We hypothesized that difference...
Published in: | Journal of Geophysical Research: Biogeosciences |
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2018
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Online Access: | https://orbit.dtu.dk/en/publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 https://doi.org/10.1002/2017JG003999 https://backend.orbit.dtu.dk/ws/files/142163898/Osburn_et_al_2017_Journal_of_Geophysical_Research_Biogeosciences.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 2024-09-15T18:09:17+00:00 Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient Osburn, Christopher L. Anderson, Nicholas J. Stedmon, Colin A. Giles, Madeline E. Whiteford, Erika J. Mcgenity, Terry J. Dumbrell, Alex J. Underwood, Graham J.C. 2018 application/pdf https://orbit.dtu.dk/en/publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 https://doi.org/10.1002/2017JG003999 https://backend.orbit.dtu.dk/ws/files/142163898/Osburn_et_al_2017_Journal_of_Geophysical_Research_Biogeosciences.pdf eng eng https://orbit.dtu.dk/en/publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 info:eu-repo/semantics/openAccess Osburn , C L , Anderson , N J , Stedmon , C A , Giles , M E , Whiteford , E J , Mcgenity , T J , Dumbrell , A J & Underwood , G J C 2018 , ' Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient ' , Journal of Geophysical Research: Biogeosciences , vol. 122 , no. 12 , pp. 3431-3445 . https://doi.org/10.1002/2017JG003999 /dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action article 2018 ftdtupubl https://doi.org/10.1002/2017JG003999 2024-07-29T23:50:17Z Dissolved organic matter (DOM) concentration and quality were examined from Arctic lakes located in three clusters across south-west (SW) Greenland, covering the regional climatic gradient: cool, wet coastal zone; dry inland interior; and cool, dry ice-marginal areas. We hypothesized that differences in mean annual precipitation between sites would result in a reduced hydrological connectivity between lakes and their catchments and that this concentrates degraded DOM. The DOM in the inland lake group was characterized by a lower aromaticity and molecular weight, a low soil-like fluorescence, and carbon stable isotope (δ 13 C-DOC) values enriched by ~2‰ relative to the coastal group. DOC-specific absorbance (SUVA 254 ) and DOC-specific soil-like fluorescence (SUVF C1 ) revealed seasonal and climatic gradients across which DOM exhibited a dynamic we term "pulse-process": Pulses of DOM exported from soils to lakes during snow and ice melt were followed by pulses of autochthonous DOM inputs (possibly from macrophytes), and their subsequent photochemical and microbial processing. These effects regulated the dynamics of DOM in the inland lakes and suggested that if circumpolar lakes currently situated in cool wetter climatic regimes with strong hydrological connectivity have reduced connectivity under a drier future climate, they may evolve toward an end-point of large stocks of highly degraded DOC, equivalent to the inland lakes in the present study. The regional climatic gradient across SW Greenland and its influence on DOM properties in these lakes provide a model of possible future changes to lake C cycling in high-latitude systems where climatic changes are most pronounced. Article in Journal/Newspaper Greenland Technical University of Denmark: DTU Orbit Journal of Geophysical Research: Biogeosciences 122 12 3431 3445 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
spellingShingle |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action Osburn, Christopher L. Anderson, Nicholas J. Stedmon, Colin A. Giles, Madeline E. Whiteford, Erika J. Mcgenity, Terry J. Dumbrell, Alex J. Underwood, Graham J.C. Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/climate_action name=SDG 13 - Climate Action |
description |
Dissolved organic matter (DOM) concentration and quality were examined from Arctic lakes located in three clusters across south-west (SW) Greenland, covering the regional climatic gradient: cool, wet coastal zone; dry inland interior; and cool, dry ice-marginal areas. We hypothesized that differences in mean annual precipitation between sites would result in a reduced hydrological connectivity between lakes and their catchments and that this concentrates degraded DOM. The DOM in the inland lake group was characterized by a lower aromaticity and molecular weight, a low soil-like fluorescence, and carbon stable isotope (δ 13 C-DOC) values enriched by ~2‰ relative to the coastal group. DOC-specific absorbance (SUVA 254 ) and DOC-specific soil-like fluorescence (SUVF C1 ) revealed seasonal and climatic gradients across which DOM exhibited a dynamic we term "pulse-process": Pulses of DOM exported from soils to lakes during snow and ice melt were followed by pulses of autochthonous DOM inputs (possibly from macrophytes), and their subsequent photochemical and microbial processing. These effects regulated the dynamics of DOM in the inland lakes and suggested that if circumpolar lakes currently situated in cool wetter climatic regimes with strong hydrological connectivity have reduced connectivity under a drier future climate, they may evolve toward an end-point of large stocks of highly degraded DOC, equivalent to the inland lakes in the present study. The regional climatic gradient across SW Greenland and its influence on DOM properties in these lakes provide a model of possible future changes to lake C cycling in high-latitude systems where climatic changes are most pronounced. |
format |
Article in Journal/Newspaper |
author |
Osburn, Christopher L. Anderson, Nicholas J. Stedmon, Colin A. Giles, Madeline E. Whiteford, Erika J. Mcgenity, Terry J. Dumbrell, Alex J. Underwood, Graham J.C. |
author_facet |
Osburn, Christopher L. Anderson, Nicholas J. Stedmon, Colin A. Giles, Madeline E. Whiteford, Erika J. Mcgenity, Terry J. Dumbrell, Alex J. Underwood, Graham J.C. |
author_sort |
Osburn, Christopher L. |
title |
Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
title_short |
Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
title_full |
Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
title_fullStr |
Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
title_full_unstemmed |
Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient |
title_sort |
shifts in the source and composition of dissolved organic matter in southwest greenland lakes along a regional hydro-climatic gradient |
publishDate |
2018 |
url |
https://orbit.dtu.dk/en/publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 https://doi.org/10.1002/2017JG003999 https://backend.orbit.dtu.dk/ws/files/142163898/Osburn_et_al_2017_Journal_of_Geophysical_Research_Biogeosciences.pdf |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Osburn , C L , Anderson , N J , Stedmon , C A , Giles , M E , Whiteford , E J , Mcgenity , T J , Dumbrell , A J & Underwood , G J C 2018 , ' Shifts in the source and composition of dissolved organic matter in Southwest Greenland lakes along a regional hydro-climatic gradient ' , Journal of Geophysical Research: Biogeosciences , vol. 122 , no. 12 , pp. 3431-3445 . https://doi.org/10.1002/2017JG003999 |
op_relation |
https://orbit.dtu.dk/en/publications/e58a25db-5bc0-4b6d-ac79-981e104f7420 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2017JG003999 |
container_title |
Journal of Geophysical Research: Biogeosciences |
container_volume |
122 |
container_issue |
12 |
container_start_page |
3431 |
op_container_end_page |
3445 |
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1810446760288452608 |