DMS emissions from the Arctic marginal ice zone
International audience Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe the distribution of DMS and its precursor dimethylsulfoniopropionate (DMSP)...
Published in: | Elementa: Science of the Anthropocene |
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Online Access: | https://hal.science/hal-03458198 https://hal.science/hal-03458198/document https://hal.science/hal-03458198/file/elementa.2020.00113.pdf https://doi.org/10.1525/elementa.2020.00113 |
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ftinsu:oai:HAL:hal-03458198v1 2023-06-18T03:39:05+02:00 DMS emissions from the Arctic marginal ice zone Galí, Martí Lizotte, Martine Kieber, David Randelhoff, Achim Hussherr, Rachel Xue, Lei Dinasquet, Julie Babin, Marcel Rehm, Eric Levasseur, Maurice Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut national des sciences de l'Univers (INSU - CNRS) 2021-07-14 https://hal.science/hal-03458198 https://hal.science/hal-03458198/document https://hal.science/hal-03458198/file/elementa.2020.00113.pdf https://doi.org/10.1525/elementa.2020.00113 en eng HAL CCSD University of California Press info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2020.00113 hal-03458198 https://hal.science/hal-03458198 https://hal.science/hal-03458198/document https://hal.science/hal-03458198/file/elementa.2020.00113.pdf doi:10.1525/elementa.2020.00113 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.science/hal-03458198 Elementa: Science of the Anthropocene, 2021, 9 (1), ⟨10.1525/elementa.2020.00113⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftinsu https://doi.org/10.1525/elementa.2020.00113 2023-06-05T20:43:19Z International audience Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe the distribution of DMS and its precursor dimethylsulfoniopropionate (DMSP) across the Baffin Bay receding ice edge in early summer 2016. Overall, DMS and total DMSP (DMSPt) increased towards warmer waters of Atlantic origin concurrently with more advanced ice-melt and bloom stages. Relatively high DMS and DMSPt (medians of 6.3 and 70 nM, respectively) were observed in the surface layer (0–9 m depth), and very high values (reaching 74 and 524 nM, respectively) at the subsurface biomass maximum (15–30 m depth). Microscopic and pigment analyses indicated that subsurface DMS and DMSPt peaks were associated with Phaeocystis pouchetii, which bloomed in Atlantic-influenced waters and reached unprecedented biomass levels in Baffin Bay. In surface waters, DMS concentrations and DMS:DMSPt ratios were higher in the MIZ (medians of 12 nM and 0.15, respectively) than in fully ice-covered or ice-free conditions, potentially associated with enhanced phytoplanktonic DMSP release and bacterial DMSP cleavage (high dddP:dmdA gene ratios). Mean sea–air DMS fluxes (µmol m–2 d–1) increased from 0.3 in ice-covered waters to 10 in open waters (maximum of 26) owing to concurrent trends in near-surface DMS concentrations and physical drivers of gas exchange. Using remotely sensed sea-ice coverage and a compilation of sea–air DMS flux data, we estimated that the pan-Arctic DMS emission from the MIZ (EDMS, MIZ) was 5–13 Gg S yr–1. North of 80°N, EDMS, MIZ might have increased by around 10 ± 4% yr–1 between 2003 and 2014, likely exceeding open-water emissions in June and July. We conclude that EDMS, MIZ must be taken into account to evaluate plankton-climate feedbacks in the Arctic. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Phytoplankton Sea ice ice covered waters Institut national des sciences de l'Univers: HAL-INSU Arctic Baffin Bay Elementa: Science of the Anthropocene 9 1 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Galí, Martí Lizotte, Martine Kieber, David Randelhoff, Achim Hussherr, Rachel Xue, Lei Dinasquet, Julie Babin, Marcel Rehm, Eric Levasseur, Maurice DMS emissions from the Arctic marginal ice zone |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Phytoplankton blooms in the Arctic marginal ice zone (MIZ) can be prolific dimethylsulfide (DMS) producers, thereby influencing regional aerosol formation and cloud radiative forcing. Here we describe the distribution of DMS and its precursor dimethylsulfoniopropionate (DMSP) across the Baffin Bay receding ice edge in early summer 2016. Overall, DMS and total DMSP (DMSPt) increased towards warmer waters of Atlantic origin concurrently with more advanced ice-melt and bloom stages. Relatively high DMS and DMSPt (medians of 6.3 and 70 nM, respectively) were observed in the surface layer (0–9 m depth), and very high values (reaching 74 and 524 nM, respectively) at the subsurface biomass maximum (15–30 m depth). Microscopic and pigment analyses indicated that subsurface DMS and DMSPt peaks were associated with Phaeocystis pouchetii, which bloomed in Atlantic-influenced waters and reached unprecedented biomass levels in Baffin Bay. In surface waters, DMS concentrations and DMS:DMSPt ratios were higher in the MIZ (medians of 12 nM and 0.15, respectively) than in fully ice-covered or ice-free conditions, potentially associated with enhanced phytoplanktonic DMSP release and bacterial DMSP cleavage (high dddP:dmdA gene ratios). Mean sea–air DMS fluxes (µmol m–2 d–1) increased from 0.3 in ice-covered waters to 10 in open waters (maximum of 26) owing to concurrent trends in near-surface DMS concentrations and physical drivers of gas exchange. Using remotely sensed sea-ice coverage and a compilation of sea–air DMS flux data, we estimated that the pan-Arctic DMS emission from the MIZ (EDMS, MIZ) was 5–13 Gg S yr–1. North of 80°N, EDMS, MIZ might have increased by around 10 ± 4% yr–1 between 2003 and 2014, likely exceeding open-water emissions in June and July. We conclude that EDMS, MIZ must be taken into account to evaluate plankton-climate feedbacks in the Arctic. |
author2 |
Takuvik Joint International Laboratory ULAVAL-CNRS Université Laval Québec (ULaval)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut national des sciences de l'Univers (INSU - CNRS) |
format |
Article in Journal/Newspaper |
author |
Galí, Martí Lizotte, Martine Kieber, David Randelhoff, Achim Hussherr, Rachel Xue, Lei Dinasquet, Julie Babin, Marcel Rehm, Eric Levasseur, Maurice |
author_facet |
Galí, Martí Lizotte, Martine Kieber, David Randelhoff, Achim Hussherr, Rachel Xue, Lei Dinasquet, Julie Babin, Marcel Rehm, Eric Levasseur, Maurice |
author_sort |
Galí, Martí |
title |
DMS emissions from the Arctic marginal ice zone |
title_short |
DMS emissions from the Arctic marginal ice zone |
title_full |
DMS emissions from the Arctic marginal ice zone |
title_fullStr |
DMS emissions from the Arctic marginal ice zone |
title_full_unstemmed |
DMS emissions from the Arctic marginal ice zone |
title_sort |
dms emissions from the arctic marginal ice zone |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03458198 https://hal.science/hal-03458198/document https://hal.science/hal-03458198/file/elementa.2020.00113.pdf https://doi.org/10.1525/elementa.2020.00113 |
geographic |
Arctic Baffin Bay |
geographic_facet |
Arctic Baffin Bay |
genre |
Arctic Baffin Bay Baffin Bay Baffin Phytoplankton Sea ice ice covered waters |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Phytoplankton Sea ice ice covered waters |
op_source |
EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.science/hal-03458198 Elementa: Science of the Anthropocene, 2021, 9 (1), ⟨10.1525/elementa.2020.00113⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2020.00113 hal-03458198 https://hal.science/hal-03458198 https://hal.science/hal-03458198/document https://hal.science/hal-03458198/file/elementa.2020.00113.pdf doi:10.1525/elementa.2020.00113 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1525/elementa.2020.00113 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1769003905707933696 |