Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma
With ongoing warming and sea ice loss, the Arctic Ocean and its marginal seas as a habitat for pelagic calcifiers are changing, possibly resulting in modifications of the regional carbonate cycle and the composition of the seafloor sediment. A substantial part of the pelagic carbonate production in...
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ftcopernicus:oai:publications.copernicus.org:bg101759 2023-05-15T14:46:05+02:00 Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma Tell, Franziska Jonkers, Lukas Meilland, Julie Kucera, Michal 2022-10-19 application/pdf https://doi.org/10.5194/bg-19-4903-2022 https://bg.copernicus.org/articles/19/4903/2022/ eng eng doi:10.5194/bg-19-4903-2022 https://bg.copernicus.org/articles/19/4903/2022/ eISSN: 1726-4189 Text 2022 ftcopernicus https://doi.org/10.5194/bg-19-4903-2022 2022-10-24T16:22:42Z With ongoing warming and sea ice loss, the Arctic Ocean and its marginal seas as a habitat for pelagic calcifiers are changing, possibly resulting in modifications of the regional carbonate cycle and the composition of the seafloor sediment. A substantial part of the pelagic carbonate production in the Arctic is due to the calcification of the dominant planktonic foraminifera species Neogloboquadrina pachyderma . To quantify carbonate production and loss in the upper water layer by this important Arctic calcifier, we compile and analyse data from vertical profiles in the upper water column of shell number concentration, sizes and weights of this species across the Arctic region during summer. Our data are inconclusive on whether the species performs ontogenetic vertical migration throughout its life cycle or whether individual specimens calcify at a fixed depth within the vertical habitat. The base of the productive zone of the species is on average located below 100 m and at maximum at 300 m and is regionally highly variable. The calcite flux immediately below the productive zone (export flux) is on average 8 mg CaCO 3 m −2 d −1 , and we observe that this flux is attenuated until at least 300 m below the base of the productive zone by a mean rate of 6.6 % per 100 m. Regionally, the summer export flux of N. pachyderma calcite varies by more than 2 orders of magnitude, and the estimated mean export flux below the twilight zone is sufficient to account for about a quarter of the total pelagic carbonate flux in the region. These results indicate that estimates of the Arctic pelagic carbonate budget will have to account for large regional differences in the export flux of the major pelagic calcifiers and confirm that substantial attenuation of the export flux occurs in the twilight zone. Text Arctic Arctic Ocean Foraminifera* Neogloboquadrina pachyderma Planktonic foraminifera Sea ice Copernicus Publications: E-Journals Arctic Arctic Ocean Biogeosciences 19 20 4903 4927 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
With ongoing warming and sea ice loss, the Arctic Ocean and its marginal seas as a habitat for pelagic calcifiers are changing, possibly resulting in modifications of the regional carbonate cycle and the composition of the seafloor sediment. A substantial part of the pelagic carbonate production in the Arctic is due to the calcification of the dominant planktonic foraminifera species Neogloboquadrina pachyderma . To quantify carbonate production and loss in the upper water layer by this important Arctic calcifier, we compile and analyse data from vertical profiles in the upper water column of shell number concentration, sizes and weights of this species across the Arctic region during summer. Our data are inconclusive on whether the species performs ontogenetic vertical migration throughout its life cycle or whether individual specimens calcify at a fixed depth within the vertical habitat. The base of the productive zone of the species is on average located below 100 m and at maximum at 300 m and is regionally highly variable. The calcite flux immediately below the productive zone (export flux) is on average 8 mg CaCO 3 m −2 d −1 , and we observe that this flux is attenuated until at least 300 m below the base of the productive zone by a mean rate of 6.6 % per 100 m. Regionally, the summer export flux of N. pachyderma calcite varies by more than 2 orders of magnitude, and the estimated mean export flux below the twilight zone is sufficient to account for about a quarter of the total pelagic carbonate flux in the region. These results indicate that estimates of the Arctic pelagic carbonate budget will have to account for large regional differences in the export flux of the major pelagic calcifiers and confirm that substantial attenuation of the export flux occurs in the twilight zone. |
format |
Text |
author |
Tell, Franziska Jonkers, Lukas Meilland, Julie Kucera, Michal |
spellingShingle |
Tell, Franziska Jonkers, Lukas Meilland, Julie Kucera, Michal Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
author_facet |
Tell, Franziska Jonkers, Lukas Meilland, Julie Kucera, Michal |
author_sort |
Tell, Franziska |
title |
Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
title_short |
Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
title_full |
Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
title_fullStr |
Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
title_full_unstemmed |
Upper-ocean flux of biogenic calcite produced by the Arctic planktonic foraminifera Neogloboquadrina pachyderma |
title_sort |
upper-ocean flux of biogenic calcite produced by the arctic planktonic foraminifera neogloboquadrina pachyderma |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-4903-2022 https://bg.copernicus.org/articles/19/4903/2022/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Foraminifera* Neogloboquadrina pachyderma Planktonic foraminifera Sea ice |
genre_facet |
Arctic Arctic Ocean Foraminifera* Neogloboquadrina pachyderma Planktonic foraminifera Sea ice |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-19-4903-2022 https://bg.copernicus.org/articles/19/4903/2022/ |
op_doi |
https://doi.org/10.5194/bg-19-4903-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
20 |
container_start_page |
4903 |
op_container_end_page |
4927 |
_version_ |
1766317351272185856 |