New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean
To date, observations on a single location indicate that cryogenic gypsum (Ca[SO4]⚫2H2O) may constitute an efficient but hitherto overlooked ballasting mineral enhancing the efficiency of the biological carbon pump in the Arctic Ocean. In June–July 2017 we sampled cryogenic gypsum under pack ice in...
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Copernicus Publications
2020
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fttriple:oai:gotriple.eu:oai:doaj.org/article:d36311b93a954a2abaa234bed551c9aa 2023-05-15T14:54:43+02:00 New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean J. E. Wollenburg M. Iversen C. Katlein T. Krumpen M. Nicolaus G. Castellani I. Peeken H. Flores 2020-06-01 https://doi.org/10.5194/tc-14-1795-2020 https://www.the-cryosphere.net/14/1795/2020/tc-14-1795-2020.pdf https://doaj.org/article/d36311b93a954a2abaa234bed551c9aa en eng Copernicus Publications doi:10.5194/tc-14-1795-2020 1994-0416 1994-0424 https://www.the-cryosphere.net/14/1795/2020/tc-14-1795-2020.pdf https://doaj.org/article/d36311b93a954a2abaa234bed551c9aa undefined The Cryosphere, Vol 14, Pp 1795-1808 (2020) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2020 fttriple https://doi.org/10.5194/tc-14-1795-2020 2023-01-22T18:19:38Z To date, observations on a single location indicate that cryogenic gypsum (Ca[SO4]⚫2H2O) may constitute an efficient but hitherto overlooked ballasting mineral enhancing the efficiency of the biological carbon pump in the Arctic Ocean. In June–July 2017 we sampled cryogenic gypsum under pack ice in the Nansen Basin north of Svalbard using a plankton net mounted on a remotely operated vehicle (ROVnet). Cryogenic gypsum crystals were present at all sampled stations, which suggested a persisting cryogenic gypsum release from melting sea ice throughout the investigated area. This was supported by a sea ice backtracking model, indicating that gypsum release was not related to a specific region of sea ice formation. The observed cryogenic gypsum crystals exhibited a large variability in morphology and size, with the largest crystals exceeding a length of 1 cm. Preservation, temperature and pressure laboratory studies revealed that gypsum dissolution rates accelerated with increasing temperature and pressure, ranging from 6 % d−1 by mass in polar surface water (−0.5 ∘C) to 81 % d−1 by mass in Atlantic Water (2.5 ∘C at 65 bar). When testing the preservation of gypsum in formaldehyde-fixed samples, we observed immediate dissolution. Dissolution at warmer temperatures and through inappropriate preservation media may thus explain why cryogenic gypsum was not observed in scientific samples previously. Direct measurements of gypsum crystal sinking velocities ranged between 200 and 7000 m d−1, suggesting that gypsum-loaded marine aggregates could rapidly sink from the surface to abyssal depths, supporting the hypothesized potential of gypsum as a ballasting mineral in the Arctic Ocean. Article in Journal/Newspaper Arctic Arctic Ocean Nansen Basin Sea ice Svalbard The Cryosphere Unknown Arctic Arctic Ocean Svalbard The Cryosphere 14 6 1795 1808 |
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envir geo |
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envir geo J. E. Wollenburg M. Iversen C. Katlein T. Krumpen M. Nicolaus G. Castellani I. Peeken H. Flores New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
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envir geo |
description |
To date, observations on a single location indicate that cryogenic gypsum (Ca[SO4]⚫2H2O) may constitute an efficient but hitherto overlooked ballasting mineral enhancing the efficiency of the biological carbon pump in the Arctic Ocean. In June–July 2017 we sampled cryogenic gypsum under pack ice in the Nansen Basin north of Svalbard using a plankton net mounted on a remotely operated vehicle (ROVnet). Cryogenic gypsum crystals were present at all sampled stations, which suggested a persisting cryogenic gypsum release from melting sea ice throughout the investigated area. This was supported by a sea ice backtracking model, indicating that gypsum release was not related to a specific region of sea ice formation. The observed cryogenic gypsum crystals exhibited a large variability in morphology and size, with the largest crystals exceeding a length of 1 cm. Preservation, temperature and pressure laboratory studies revealed that gypsum dissolution rates accelerated with increasing temperature and pressure, ranging from 6 % d−1 by mass in polar surface water (−0.5 ∘C) to 81 % d−1 by mass in Atlantic Water (2.5 ∘C at 65 bar). When testing the preservation of gypsum in formaldehyde-fixed samples, we observed immediate dissolution. Dissolution at warmer temperatures and through inappropriate preservation media may thus explain why cryogenic gypsum was not observed in scientific samples previously. Direct measurements of gypsum crystal sinking velocities ranged between 200 and 7000 m d−1, suggesting that gypsum-loaded marine aggregates could rapidly sink from the surface to abyssal depths, supporting the hypothesized potential of gypsum as a ballasting mineral in the Arctic Ocean. |
format |
Article in Journal/Newspaper |
author |
J. E. Wollenburg M. Iversen C. Katlein T. Krumpen M. Nicolaus G. Castellani I. Peeken H. Flores |
author_facet |
J. E. Wollenburg M. Iversen C. Katlein T. Krumpen M. Nicolaus G. Castellani I. Peeken H. Flores |
author_sort |
J. E. Wollenburg |
title |
New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
title_short |
New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
title_full |
New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
title_fullStr |
New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
title_full_unstemmed |
New observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the Arctic Ocean |
title_sort |
new observations of the distribution, morphology and dissolution dynamics of cryogenic gypsum in the arctic ocean |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-1795-2020 https://www.the-cryosphere.net/14/1795/2020/tc-14-1795-2020.pdf https://doaj.org/article/d36311b93a954a2abaa234bed551c9aa |
geographic |
Arctic Arctic Ocean Svalbard |
geographic_facet |
Arctic Arctic Ocean Svalbard |
genre |
Arctic Arctic Ocean Nansen Basin Sea ice Svalbard The Cryosphere |
genre_facet |
Arctic Arctic Ocean Nansen Basin Sea ice Svalbard The Cryosphere |
op_source |
The Cryosphere, Vol 14, Pp 1795-1808 (2020) |
op_relation |
doi:10.5194/tc-14-1795-2020 1994-0416 1994-0424 https://www.the-cryosphere.net/14/1795/2020/tc-14-1795-2020.pdf https://doaj.org/article/d36311b93a954a2abaa234bed551c9aa |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/tc-14-1795-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
1795 |
op_container_end_page |
1808 |
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1766326479697739776 |