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Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years.

https://arctichealth.org/en/permalink/ahliterature304820
Source
Glob Chang Biol. 2020 Dec; 26(12):6767-6786
Publication Type
Journal Article
Date
Dec-2020
Author
Audrey Limoges
Kaarina Weckström
Sofia Ribeiro
Eleanor Georgiadis
Katrine E Hansen
Philippe Martinez
Marit-Solveig Seidenkrantz
Jacques Giraudeau
Xavier Crosta
Guillaume Massé
Author Affiliation
Department of Earth Sciences, University of New Brunswick, Fredericton, NB, Canada.
Source
Glob Chang Biol. 2020 Dec; 26(12):6767-6786
Date
Dec-2020
Language
English
Publication Type
Journal Article
Abstract
Climate warming is rapidly reshaping the Arctic cryosphere and ocean conditions, with consequences for sea ice and pelagic productivity patterns affecting the entire marine food web. To predict how ongoing changes will impact Arctic marine ecosystems, concerted effort from various disciplines is required. Here, we contribute multi-decadal reconstructions of changes in diatom production and sea-ice conditions in relation to Holocene climate and ocean conditions off northwest Greenland. Our multiproxy study includes diatoms, sea-ice biomarkers (IP25 and HBI III) and geochemical tracers (TOC [total organic carbon], TOC:TN [total nitrogen], d13 C, d15 N) from a sediment core record spanning the last c. 9,000 years. Our results suggest that the balance between the outflow of polar water from the Arctic, and input of Atlantic water from the Irminger Current into the West Greenland Current is a key factor in controlling sea-ice conditions, and both diatom phenology and production in northeastern Baffin Bay. Our proxy record notably shows that changes in sea-surface conditions initially forced by Neoglacial cooling were dynamically amplified by the shift in the dominant phase of the Arctic Oscillation (AO) mode that occurred at c. 3,000 yr BP, and caused drastic changes in community composition and a decline in diatom production at the study site. In the future, with projected dominant-positive AO conditions favored by Arctic warming, increased water column stratification may counteract the positive effect of a longer open-water growth season and negatively impact diatom production.
PubMed ID
32885894 View in PubMed
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Learning from the past: Impact of the Arctic Oscillation on sea ice and marine productivity off northwest Greenland over the last 9,000 years.

https://arctichealth.org/en/permalink/ahliterature311556
Source
Glob Chang Biol. 2020 Dec; 26(12):6767-6786
Publication Type
Journal Article
Date
Dec-2020
Author
Audrey Limoges
Kaarina Weckström
Sofia Ribeiro
Eleanor Georgiadis
Katrine E Hansen
Philippe Martinez
Marit-Solveig Seidenkrantz
Jacques Giraudeau
Xavier Crosta
Guillaume Massé
Author Affiliation
Department of Earth Sciences, University of New Brunswick, Fredericton, NB, Canada.
Source
Glob Chang Biol. 2020 Dec; 26(12):6767-6786
Date
Dec-2020
Language
English
Publication Type
Journal Article
Keywords
Arctic Regions
Ecosystem
Food chain
Greenland
Ice Cover
Abstract
Climate warming is rapidly reshaping the Arctic cryosphere and ocean conditions, with consequences for sea ice and pelagic productivity patterns affecting the entire marine food web. To predict how ongoing changes will impact Arctic marine ecosystems, concerted effort from various disciplines is required. Here, we contribute multi-decadal reconstructions of changes in diatom production and sea-ice conditions in relation to Holocene climate and ocean conditions off northwest Greenland. Our multiproxy study includes diatoms, sea-ice biomarkers (IP25 and HBI III) and geochemical tracers (TOC [total organic carbon], TOC:TN [total nitrogen], d13 C, d15 N) from a sediment core record spanning the last c. 9,000 years. Our results suggest that the balance between the outflow of polar water from the Arctic, and input of Atlantic water from the Irminger Current into the West Greenland Current is a key factor in controlling sea-ice conditions, and both diatom phenology and production in northeastern Baffin Bay. Our proxy record notably shows that changes in sea-surface conditions initially forced by Neoglacial cooling were dynamically amplified by the shift in the dominant phase of the Arctic Oscillation (AO) mode that occurred at c. 3,000 yr BP, and caused drastic changes in community composition and a decline in diatom production at the study site. In the future, with projected dominant-positive AO conditions favored by Arctic warming, increased water column stratification may counteract the positive effect of a longer open-water growth season and negatively impact diatom production.
PubMed ID
32885894 View in PubMed
Less detail