Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century
Climate warming and the resulting acceleration of freshwater discharge from the Greenland Ice Sheet are impacting Arctic marine coastal ecosystems, with implications for their biological productivity. To accurately project the future of coastal ecosystems and place recent trends into perspective, pa...
Published in: | The Cryosphere |
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Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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2022
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Online Access: | https://curis.ku.dk/portal/da/publications/impact-of-freshwater-runoff-from-the-southwest-greenland-ice-sheet-on-fjord-productivity-since-the-late-19th-century(63c53aaf-ec29-4e23-bb91-83649082530d).html https://doi.org/10.5194/tc-16-2471-2022 https://curis.ku.dk/ws/files/312626452/Impact_of_freshwater_runoff_from.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/63c53aaf-ec29-4e23-bb91-83649082530d 2024-06-09T07:43:59+00:00 Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century Oksman, Mimmi Kvorning, Anna Bang Larsen, Signe Hillerup Kjeldsen, Kristian Kjellerup Mankoff, Kenneth David Colgan, William Andersen, Thorbjørn Joest Nørgaard-Pedersen, Niels Seidenkrantz, Marit-Solveig Mikkelsen, Naja Ribeiro, Sofia 2022 application/pdf https://curis.ku.dk/portal/da/publications/impact-of-freshwater-runoff-from-the-southwest-greenland-ice-sheet-on-fjord-productivity-since-the-late-19th-century(63c53aaf-ec29-4e23-bb91-83649082530d).html https://doi.org/10.5194/tc-16-2471-2022 https://curis.ku.dk/ws/files/312626452/Impact_of_freshwater_runoff_from.pdf eng eng info:eu-repo/semantics/openAccess Oksman , M , Kvorning , A B , Larsen , S H , Kjeldsen , K K , Mankoff , K D , Colgan , W , Andersen , T J , Nørgaard-Pedersen , N , Seidenkrantz , M-S , Mikkelsen , N & Ribeiro , S 2022 , ' Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century ' , The Cryosphere , vol. 16 , no. 6 , pp. 2471-2491 . https://doi.org/10.5194/tc-16-2471-2022 TIDEWATER OUTLET GLACIERS SPRING BLOOM DYNAMICS MASS-BALANCE SEA-ICE NE GREENLAND CO2 UPTAKE SEDIMENTS MARINE CLIMATE PHYTOPLANKTON article 2022 ftcopenhagenunip https://doi.org/10.5194/tc-16-2471-2022 2024-05-16T11:29:24Z Climate warming and the resulting acceleration of freshwater discharge from the Greenland Ice Sheet are impacting Arctic marine coastal ecosystems, with implications for their biological productivity. To accurately project the future of coastal ecosystems and place recent trends into perspective, palaeo-records are essential. Here, we show runoff estimates from the late 19th century to the present day for a large sub-Arctic fjord system (Nuup Kangerlua, southwest Greenland) influenced by both marine- and land-terminating glaciers. We followed a multiproxy approach to reconstruct spatial and temporal trends in primary production from four sediment core records, including diatom fluxes and assemblage composition changes and biogeochemical and sedimentological proxies (total organic carbon, nitrogen, C=N ratio, biogenic silica, delta C-13, delta N-15, and grain-size distribution). We show that an abrupt increase in freshwater runoff in the mid-1990s was reflected by a 3-fold increase in biogenic silica fluxes in the glacier-proximal area of the fjord. In addition to increased productivity, freshwater runoff modulates the diatom assemblages and drives the dynamics and magnitude of the diatom spring bloom. Our records indicate that marine productivity is higher today than it has been at any point since the late 19th century and suggest that increased mass loss of the Greenland Ice Sheet may continue pro- moting high productivity levels at sites proximal to marineterminating glaciers. We highlight the importance of palaeorecords in offering a unique temporal perspective on iceocean-ecosystem responses to climate forcing beyond existing remote sensing or monitoring time series. Article in Journal/Newspaper Arctic glacier Greenland Ice Sheet Phytoplankton Sea ice The Cryosphere Tidewater University of Copenhagen: Research Arctic Greenland The Cryosphere 16 6 2471 2491 |
institution |
Open Polar |
collection |
University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
topic |
TIDEWATER OUTLET GLACIERS SPRING BLOOM DYNAMICS MASS-BALANCE SEA-ICE NE GREENLAND CO2 UPTAKE SEDIMENTS MARINE CLIMATE PHYTOPLANKTON |
spellingShingle |
TIDEWATER OUTLET GLACIERS SPRING BLOOM DYNAMICS MASS-BALANCE SEA-ICE NE GREENLAND CO2 UPTAKE SEDIMENTS MARINE CLIMATE PHYTOPLANKTON Oksman, Mimmi Kvorning, Anna Bang Larsen, Signe Hillerup Kjeldsen, Kristian Kjellerup Mankoff, Kenneth David Colgan, William Andersen, Thorbjørn Joest Nørgaard-Pedersen, Niels Seidenkrantz, Marit-Solveig Mikkelsen, Naja Ribeiro, Sofia Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
topic_facet |
TIDEWATER OUTLET GLACIERS SPRING BLOOM DYNAMICS MASS-BALANCE SEA-ICE NE GREENLAND CO2 UPTAKE SEDIMENTS MARINE CLIMATE PHYTOPLANKTON |
description |
Climate warming and the resulting acceleration of freshwater discharge from the Greenland Ice Sheet are impacting Arctic marine coastal ecosystems, with implications for their biological productivity. To accurately project the future of coastal ecosystems and place recent trends into perspective, palaeo-records are essential. Here, we show runoff estimates from the late 19th century to the present day for a large sub-Arctic fjord system (Nuup Kangerlua, southwest Greenland) influenced by both marine- and land-terminating glaciers. We followed a multiproxy approach to reconstruct spatial and temporal trends in primary production from four sediment core records, including diatom fluxes and assemblage composition changes and biogeochemical and sedimentological proxies (total organic carbon, nitrogen, C=N ratio, biogenic silica, delta C-13, delta N-15, and grain-size distribution). We show that an abrupt increase in freshwater runoff in the mid-1990s was reflected by a 3-fold increase in biogenic silica fluxes in the glacier-proximal area of the fjord. In addition to increased productivity, freshwater runoff modulates the diatom assemblages and drives the dynamics and magnitude of the diatom spring bloom. Our records indicate that marine productivity is higher today than it has been at any point since the late 19th century and suggest that increased mass loss of the Greenland Ice Sheet may continue pro- moting high productivity levels at sites proximal to marineterminating glaciers. We highlight the importance of palaeorecords in offering a unique temporal perspective on iceocean-ecosystem responses to climate forcing beyond existing remote sensing or monitoring time series. |
format |
Article in Journal/Newspaper |
author |
Oksman, Mimmi Kvorning, Anna Bang Larsen, Signe Hillerup Kjeldsen, Kristian Kjellerup Mankoff, Kenneth David Colgan, William Andersen, Thorbjørn Joest Nørgaard-Pedersen, Niels Seidenkrantz, Marit-Solveig Mikkelsen, Naja Ribeiro, Sofia |
author_facet |
Oksman, Mimmi Kvorning, Anna Bang Larsen, Signe Hillerup Kjeldsen, Kristian Kjellerup Mankoff, Kenneth David Colgan, William Andersen, Thorbjørn Joest Nørgaard-Pedersen, Niels Seidenkrantz, Marit-Solveig Mikkelsen, Naja Ribeiro, Sofia |
author_sort |
Oksman, Mimmi |
title |
Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
title_short |
Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
title_full |
Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
title_fullStr |
Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
title_full_unstemmed |
Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century |
title_sort |
impact of freshwater runoff from the southwest greenland ice sheet on fjord productivity since the late 19th century |
publishDate |
2022 |
url |
https://curis.ku.dk/portal/da/publications/impact-of-freshwater-runoff-from-the-southwest-greenland-ice-sheet-on-fjord-productivity-since-the-late-19th-century(63c53aaf-ec29-4e23-bb91-83649082530d).html https://doi.org/10.5194/tc-16-2471-2022 https://curis.ku.dk/ws/files/312626452/Impact_of_freshwater_runoff_from.pdf |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic glacier Greenland Ice Sheet Phytoplankton Sea ice The Cryosphere Tidewater |
genre_facet |
Arctic glacier Greenland Ice Sheet Phytoplankton Sea ice The Cryosphere Tidewater |
op_source |
Oksman , M , Kvorning , A B , Larsen , S H , Kjeldsen , K K , Mankoff , K D , Colgan , W , Andersen , T J , Nørgaard-Pedersen , N , Seidenkrantz , M-S , Mikkelsen , N & Ribeiro , S 2022 , ' Impact of freshwater runoff from the southwest Greenland Ice Sheet on fjord productivity since the late 19th century ' , The Cryosphere , vol. 16 , no. 6 , pp. 2471-2491 . https://doi.org/10.5194/tc-16-2471-2022 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-16-2471-2022 |
container_title |
The Cryosphere |
container_volume |
16 |
container_issue |
6 |
container_start_page |
2471 |
op_container_end_page |
2491 |
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1801372791156506624 |