Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models
Characteristics and trends of surface ocean dimethylsulfide (DMS) concentrations and fluxes into the atmosphere of four Earth System Models (ESMs: CNRM-ESM2-1, MIROC-ES2L, NorESM2-LM and UKESM1-0-LL) are analysed over the recent past (1980–2009) and into the future, using Coupled Model Intercomparis...
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ftcopernicus:oai:publications.copernicus.org:bgd91682 2023-05-15T18:18:42+02:00 Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models Bock, Josué Michou, Martine Nabat, Pierre Abe, Manabu Mulcahy, Jane P. Olivié, Dirk J. L. Schwinger, Jörg Suntharalingam, Parvadha Tjiputra, Jerry Hulten, Marco Watanabe, Michio Yool, Andrew Séférian, Roland 2021-01-08 application/pdf https://doi.org/10.5194/bg-2020-463 https://bg.copernicus.org/preprints/bg-2020-463/ eng eng doi:10.5194/bg-2020-463 https://bg.copernicus.org/preprints/bg-2020-463/ eISSN: 1726-4189 Text 2021 ftcopernicus https://doi.org/10.5194/bg-2020-463 2021-01-11T17:22:14Z Characteristics and trends of surface ocean dimethylsulfide (DMS) concentrations and fluxes into the atmosphere of four Earth System Models (ESMs: CNRM-ESM2-1, MIROC-ES2L, NorESM2-LM and UKESM1-0-LL) are analysed over the recent past (1980–2009) and into the future, using Coupled Model Intercomparison Project 6 (CMIP6) simulations. The DMS concentrations in historical simulations systematically underestimate the most widely-used observed climatology, but compare more favourably against two recent observation based datasets. The models better reproduce observations in mid to high latitudes, as well as in polar and westerlies marine biomes. The resulting multi-model estimate of contemporary global ocean DMS emissions is of 16–24 Tg S year −1 , which is narrower than the observational-derived range of 16 to 28 Tg S year −1 . The four models disagree on the sign of the trend of the global DMS flux from 1980 onwards, with two models showing an increase and two models a decrease. At the global scale, these trends are dominated by changes in surface DMS concentrations in all models, irrespective of the air-sea flux parameterisation used. In turn, three models consistently show that changes in DMS concentrations are correlated with changes in marine productivity, however the latter is poorly constrained in the current generation of ESMs, thus limiting the predictive ability of this relationship. In contrast, a consensus is found among all models over polar latitudes where an increasing trend is predominantly driven by the retreating sea-ice extent. However, the magnitude of this trend between models differs by a factor of three, from 2.9 to 9.2 Gg S decade −1 over the period 1980–2014, which is at the low end of a recent satellite-derived analysis. Similar increasing trends are found in climate projections over the 21st century. Text Sea ice Copernicus Publications: E-Journals |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Characteristics and trends of surface ocean dimethylsulfide (DMS) concentrations and fluxes into the atmosphere of four Earth System Models (ESMs: CNRM-ESM2-1, MIROC-ES2L, NorESM2-LM and UKESM1-0-LL) are analysed over the recent past (1980–2009) and into the future, using Coupled Model Intercomparison Project 6 (CMIP6) simulations. The DMS concentrations in historical simulations systematically underestimate the most widely-used observed climatology, but compare more favourably against two recent observation based datasets. The models better reproduce observations in mid to high latitudes, as well as in polar and westerlies marine biomes. The resulting multi-model estimate of contemporary global ocean DMS emissions is of 16–24 Tg S year −1 , which is narrower than the observational-derived range of 16 to 28 Tg S year −1 . The four models disagree on the sign of the trend of the global DMS flux from 1980 onwards, with two models showing an increase and two models a decrease. At the global scale, these trends are dominated by changes in surface DMS concentrations in all models, irrespective of the air-sea flux parameterisation used. In turn, three models consistently show that changes in DMS concentrations are correlated with changes in marine productivity, however the latter is poorly constrained in the current generation of ESMs, thus limiting the predictive ability of this relationship. In contrast, a consensus is found among all models over polar latitudes where an increasing trend is predominantly driven by the retreating sea-ice extent. However, the magnitude of this trend between models differs by a factor of three, from 2.9 to 9.2 Gg S decade −1 over the period 1980–2014, which is at the low end of a recent satellite-derived analysis. Similar increasing trends are found in climate projections over the 21st century. |
format |
Text |
author |
Bock, Josué Michou, Martine Nabat, Pierre Abe, Manabu Mulcahy, Jane P. Olivié, Dirk J. L. Schwinger, Jörg Suntharalingam, Parvadha Tjiputra, Jerry Hulten, Marco Watanabe, Michio Yool, Andrew Séférian, Roland |
spellingShingle |
Bock, Josué Michou, Martine Nabat, Pierre Abe, Manabu Mulcahy, Jane P. Olivié, Dirk J. L. Schwinger, Jörg Suntharalingam, Parvadha Tjiputra, Jerry Hulten, Marco Watanabe, Michio Yool, Andrew Séférian, Roland Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
author_facet |
Bock, Josué Michou, Martine Nabat, Pierre Abe, Manabu Mulcahy, Jane P. Olivié, Dirk J. L. Schwinger, Jörg Suntharalingam, Parvadha Tjiputra, Jerry Hulten, Marco Watanabe, Michio Yool, Andrew Séférian, Roland |
author_sort |
Bock, Josué |
title |
Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
title_short |
Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
title_full |
Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
title_fullStr |
Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
title_full_unstemmed |
Evaluation of ocean dimethylsulfide concentration and emission in CMIP6 models |
title_sort |
evaluation of ocean dimethylsulfide concentration and emission in cmip6 models |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-2020-463 https://bg.copernicus.org/preprints/bg-2020-463/ |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bg-2020-463 https://bg.copernicus.org/preprints/bg-2020-463/ |
op_doi |
https://doi.org/10.5194/bg-2020-463 |
_version_ |
1766195361795276800 |