Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space
International audience Dimethylsulfide (DMS) is biologically produced in the surface ocean and is the dominant natural source of sulfur to the atmosphere. Although DMS is an algal by-product, the ratio of DMS to chlorophyll (DMS:Chl) varies widely in the surface ocean. This is presumably because dim...
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ftccsdartic:oai:HAL:hal-00759108v1 2023-05-15T18:25:58+02:00 Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space Masotti, I. Belviso, S. Alvain, Séverine Johnson, S. Bates, J. E. Tortell, P D Kasamatsu, N. Mongin, M. Marandino, C. A. Saltzman, E. S. Moulin, C. Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS) Department of Earth System Science Irvine (ESS) University of California Irvine (UCI) University of California-University of California 2011 https://hal.archives-ouvertes.fr/hal-00759108 https://doi.org/10.5194/bgd-7-3605-2010 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-7-3605-2010 hal-00759108 https://hal.archives-ouvertes.fr/hal-00759108 doi:10.5194/bgd-7-3605-2010 ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00759108 Biogeosciences Discussions, European Geosciences Union, 2011, 7 (3), pp.3605-3650. ⟨10.5194/bgd-7-3605-2010⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2011 ftccsdartic https://doi.org/10.5194/bgd-7-3605-2010 2021-12-12T05:37:52Z International audience Dimethylsulfide (DMS) is biologically produced in the surface ocean and is the dominant natural source of sulfur to the atmosphere. Although DMS is an algal by-product, the ratio of DMS to chlorophyll (DMS:Chl) varies widely in the surface ocean. This is presumably because dimethylsulfoniopropionate (DMSP), the major precursor of DMS, DMSP-lyases, which catalyze the conversion of DMSP to DMS, and Chl vary as well with taxonomic composition than with the physiological state of the algal assemblage. Here we use remote sensing of Chl and phytoplankton dominance from PHYSAT with in-situ measured DMS concentrations to assess on an unprecedented spatial scale the affect of species composition on the DMS:Chl ratio in the surface ocean. Meridional distributions at 22° W in the Atlantic, and 95° W and 110° W in the Pacific, showed the same marked drop in DMS:Chl ratios near the equator, down to few mmol g−1, yet the basins exhibited different species dominance signatures. Hence, our results suggest that species composition was of secondary importance in controlling DMS and DMS:Chl variations in equatorial upwellings as well as physiological shifts in algal DMS production since mixed layer growth conditions (i.e., nutrient stress, temperature and light) were relatively homogeneous over the eastern equatorial Pacific. In the Indian sector of the Southern Ocean, warm core eddies with contrasting PHYSAT signatures displayed similar DMS levels. However, DMS:Chl ratios in eddies dominated by Synechococcus (SYN) were about 50% lower than that found in eddies showing nanoeucayotes or Phaeocystis-like signatures. DMS:Chl ratios varied with latitude in SYN dominated regions with ratios at low latitudes (away from equatorial upwellings) about twice that found at high northern and southern latitudes. This is the sole piece of coherent observations which indicates that species composition and growth conditions affect the large-scale dynamics of the DMS:Chl ratio. Overall, it appears that the DMS:Chl ratio is ... Article in Journal/Newspaper Southern Ocean Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Southern Ocean Pacific Indian |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Masotti, I. Belviso, S. Alvain, Séverine Johnson, S. Bates, J. E. Tortell, P D Kasamatsu, N. Mongin, M. Marandino, C. A. Saltzman, E. S. Moulin, C. Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience Dimethylsulfide (DMS) is biologically produced in the surface ocean and is the dominant natural source of sulfur to the atmosphere. Although DMS is an algal by-product, the ratio of DMS to chlorophyll (DMS:Chl) varies widely in the surface ocean. This is presumably because dimethylsulfoniopropionate (DMSP), the major precursor of DMS, DMSP-lyases, which catalyze the conversion of DMSP to DMS, and Chl vary as well with taxonomic composition than with the physiological state of the algal assemblage. Here we use remote sensing of Chl and phytoplankton dominance from PHYSAT with in-situ measured DMS concentrations to assess on an unprecedented spatial scale the affect of species composition on the DMS:Chl ratio in the surface ocean. Meridional distributions at 22° W in the Atlantic, and 95° W and 110° W in the Pacific, showed the same marked drop in DMS:Chl ratios near the equator, down to few mmol g−1, yet the basins exhibited different species dominance signatures. Hence, our results suggest that species composition was of secondary importance in controlling DMS and DMS:Chl variations in equatorial upwellings as well as physiological shifts in algal DMS production since mixed layer growth conditions (i.e., nutrient stress, temperature and light) were relatively homogeneous over the eastern equatorial Pacific. In the Indian sector of the Southern Ocean, warm core eddies with contrasting PHYSAT signatures displayed similar DMS levels. However, DMS:Chl ratios in eddies dominated by Synechococcus (SYN) were about 50% lower than that found in eddies showing nanoeucayotes or Phaeocystis-like signatures. DMS:Chl ratios varied with latitude in SYN dominated regions with ratios at low latitudes (away from equatorial upwellings) about twice that found at high northern and southern latitudes. This is the sole piece of coherent observations which indicates that species composition and growth conditions affect the large-scale dynamics of the DMS:Chl ratio. Overall, it appears that the DMS:Chl ratio is ... |
author2 |
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Centre National de la Recherche Scientifique (CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Institut national des sciences de l'Univers (INSU - CNRS) Department of Earth System Science Irvine (ESS) University of California Irvine (UCI) University of California-University of California |
format |
Article in Journal/Newspaper |
author |
Masotti, I. Belviso, S. Alvain, Séverine Johnson, S. Bates, J. E. Tortell, P D Kasamatsu, N. Mongin, M. Marandino, C. A. Saltzman, E. S. Moulin, C. |
author_facet |
Masotti, I. Belviso, S. Alvain, Séverine Johnson, S. Bates, J. E. Tortell, P D Kasamatsu, N. Mongin, M. Marandino, C. A. Saltzman, E. S. Moulin, C. |
author_sort |
Masotti, I. |
title |
Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
title_short |
Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
title_full |
Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
title_fullStr |
Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
title_full_unstemmed |
Spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: An assessment in the light of phytoplankton composition determined from space |
title_sort |
spatial and temporal variability of the dimethylsulfide to chlorophyll ratio in the surface ocean: an assessment in the light of phytoplankton composition determined from space |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.archives-ouvertes.fr/hal-00759108 https://doi.org/10.5194/bgd-7-3605-2010 |
geographic |
Southern Ocean Pacific Indian |
geographic_facet |
Southern Ocean Pacific Indian |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
ISSN: 1810-6277 EISSN: 1810-6285 Biogeosciences Discussions https://hal.archives-ouvertes.fr/hal-00759108 Biogeosciences Discussions, European Geosciences Union, 2011, 7 (3), pp.3605-3650. ⟨10.5194/bgd-7-3605-2010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/bgd-7-3605-2010 hal-00759108 https://hal.archives-ouvertes.fr/hal-00759108 doi:10.5194/bgd-7-3605-2010 |
op_doi |
https://doi.org/10.5194/bgd-7-3605-2010 |
_version_ |
1766207708918185984 |