Observations of late-winter marine productivity in an ice-covered fjord, West Greenland

Direct observations of marine microbial metabolism are sparse in the Arctic, particularly under sea ice during winter. This paper presents the first observations of Arctic winter microbial activity under sea ice in a west Greenland fjord (Lillefjord, ∼70° N). Here, measured changes in dissolved oxyg...

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Main Authors: Chandler, David, Mackie, Shona
Format: Text
Language:English
Published: 2019
Subjects:
Online Access:https://doi.org/10.5194/essd-2019-181
https://www.earth-syst-sci-data-discuss.net/essd-2019-181/
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spelling ftcopernicus:oai:publications.copernicus.org:essdd80498 2023-05-15T14:48:08+02:00 Observations of late-winter marine productivity in an ice-covered fjord, West Greenland Chandler, David Mackie, Shona 2019-11-11 application/pdf https://doi.org/10.5194/essd-2019-181 https://www.earth-syst-sci-data-discuss.net/essd-2019-181/ eng eng doi:10.5194/essd-2019-181 https://www.earth-syst-sci-data-discuss.net/essd-2019-181/ eISSN: 1866-3516 Text 2019 ftcopernicus https://doi.org/10.5194/essd-2019-181 2019-12-24T09:48:14Z Direct observations of marine microbial metabolism are sparse in the Arctic, particularly under sea ice during winter. This paper presents the first observations of Arctic winter microbial activity under sea ice in a west Greenland fjord (Lillefjord, ∼70° N). Here, measured changes in dissolved oxygen (DO) content in light and dark in-situ incubations were used to calculate net community productivity, respiration and photosynthesis rates. Data were collected at two fully ice-covered sites during February 2013, shortly after the end of the polar night. Averaged over the full study period, dark incubations showed statistically significant decreases in DO of −0.36 ± 0.24 (near shore) and -0.09 ± 0.07 gO 2 m −3 d −1 (fjord centre), which are 2–20 times greater than rates previously reported under sea ice in the Arctic. The data provide no significant evidence for photosynthesis or any temporal change in metabolism rates over the study period; however, ambient sea water DO increased significantly at the fjord centre (0.023 ± 0.013 gO 2 m −3 d −1 ), possibly attributable to sea ice algal photosynthesis. These incubation data may improve our understanding of microbial activity in the fjord during winter, and their contribution to Arctic ecosystems under present and future conditions. The data are available online at https://doi.pangaea.de/10.1594/PANGAEA.906332 . Text Arctic Greenland polar night Sea ice Copernicus Publications: E-Journals Arctic Greenland
institution Open Polar
collection Copernicus Publications: E-Journals
op_collection_id ftcopernicus
language English
description Direct observations of marine microbial metabolism are sparse in the Arctic, particularly under sea ice during winter. This paper presents the first observations of Arctic winter microbial activity under sea ice in a west Greenland fjord (Lillefjord, ∼70° N). Here, measured changes in dissolved oxygen (DO) content in light and dark in-situ incubations were used to calculate net community productivity, respiration and photosynthesis rates. Data were collected at two fully ice-covered sites during February 2013, shortly after the end of the polar night. Averaged over the full study period, dark incubations showed statistically significant decreases in DO of −0.36 ± 0.24 (near shore) and -0.09 ± 0.07 gO 2 m −3 d −1 (fjord centre), which are 2–20 times greater than rates previously reported under sea ice in the Arctic. The data provide no significant evidence for photosynthesis or any temporal change in metabolism rates over the study period; however, ambient sea water DO increased significantly at the fjord centre (0.023 ± 0.013 gO 2 m −3 d −1 ), possibly attributable to sea ice algal photosynthesis. These incubation data may improve our understanding of microbial activity in the fjord during winter, and their contribution to Arctic ecosystems under present and future conditions. The data are available online at https://doi.pangaea.de/10.1594/PANGAEA.906332 .
format Text
author Chandler, David
Mackie, Shona
spellingShingle Chandler, David
Mackie, Shona
Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
author_facet Chandler, David
Mackie, Shona
author_sort Chandler, David
title Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
title_short Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
title_full Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
title_fullStr Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
title_full_unstemmed Observations of late-winter marine productivity in an ice-covered fjord, West Greenland
title_sort observations of late-winter marine productivity in an ice-covered fjord, west greenland
publishDate 2019
url https://doi.org/10.5194/essd-2019-181
https://www.earth-syst-sci-data-discuss.net/essd-2019-181/
geographic Arctic
Greenland
geographic_facet Arctic
Greenland
genre Arctic
Greenland
polar night
Sea ice
genre_facet Arctic
Greenland
polar night
Sea ice
op_source eISSN: 1866-3516
op_relation doi:10.5194/essd-2019-181
https://www.earth-syst-sci-data-discuss.net/essd-2019-181/
op_doi https://doi.org/10.5194/essd-2019-181
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