A systematic study of the impact of freshwater pulses with respect to different geographical locations

International audience The first comparative and systematic climatemodel study of the sensitivity of the climate response underLast Glacial Maximum (LGM) conditions to freshwaterperturbations at various locations that are known to havereceived significant amounts of freshwater during the LGM(21 kyr...

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Published in:Climate Dynamics
Main Authors: Roche, Didier, Wiersma, Ane, Renssen, Hans
Other Authors: Department of Earth Sciences Amsterdam, VU University Amsterdam, Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Deltares The Netherlands
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2010
Subjects:
Online Access:https://hal.archives-ouvertes.fr/hal-03201059
https://hal.archives-ouvertes.fr/hal-03201059/document
https://hal.archives-ouvertes.fr/hal-03201059/file/Roche2010_Article_ASystematicStudyOfTheImpactOfF.pdf
https://doi.org/10.1007/s00382-009-0578-8
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spelling ftccsdartic:oai:HAL:hal-03201059v1 2023-05-15T15:15:20+02:00 A systematic study of the impact of freshwater pulses with respect to different geographical locations Roche, Didier Wiersma, Ane Renssen, Hans Department of Earth Sciences Amsterdam VU University Amsterdam Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) Deltares The Netherlands 2010-06 https://hal.archives-ouvertes.fr/hal-03201059 https://hal.archives-ouvertes.fr/hal-03201059/document https://hal.archives-ouvertes.fr/hal-03201059/file/Roche2010_Article_ASystematicStudyOfTheImpactOfF.pdf https://doi.org/10.1007/s00382-009-0578-8 en eng HAL CCSD Springer Verlag info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-009-0578-8 hal-03201059 https://hal.archives-ouvertes.fr/hal-03201059 https://hal.archives-ouvertes.fr/hal-03201059/document https://hal.archives-ouvertes.fr/hal-03201059/file/Roche2010_Article_ASystematicStudyOfTheImpactOfF.pdf doi:10.1007/s00382-009-0578-8 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0930-7575 EISSN: 1432-0894 Climate Dynamics https://hal.archives-ouvertes.fr/hal-03201059 Climate Dynamics, Springer Verlag, 2010, 34 (7-8), pp.997-1013. ⟨10.1007/s00382-009-0578-8⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2010 ftccsdartic https://doi.org/10.1007/s00382-009-0578-8 2021-12-19T00:16:08Z International audience The first comparative and systematic climatemodel study of the sensitivity of the climate response underLast Glacial Maximum (LGM) conditions to freshwaterperturbations at various locations that are known to havereceived significant amounts of freshwater during the LGM(21 kyr BP) climate conditions is presented. A series of tenregions representative of those receiving most of the meltwater from decaying ice-sheets during the deglaciation isdefined, comprising the border of LGM ice-sheets, outlets ofrivers draining part of the melting ice-sheets and iceberg meltzones. The effect of several given freshwater fluxes appliedseparately in each of these regions on regional and globalclimate is subsequently tested. The climate response is thenanalysed both for the atmosphere and oceans. Amongst theregions defined, it is found that the area close by anddynamically upstream to the main deep water formation zonein the North Atlantic are most sensitive to freshwater pulses,as is expected. However, some important differencesbetween Arctic freshwater forcing and Nordic Seas forcingare found, the former having a longer term response linked tosea-ice formation and advection whereas the latter exhibitsmore direct influence of direct freshening of the deep waterformation sites. Combining the common surface temperatureresponse for each respective zone, we fingerprint the particular surface temperature response obtained by addingfreshwater in a particular location. This is done to examine ifa surface climate response can be used to determine theorigin of a meltwater flux, which is relevant for the interpretation of proxy data. We show that it is indeed possible togenerally classify the fingerprints by their origin in terms ofsea-ice modification and modification of deep-water formation. Whilst the latter is not an unambiguous characterization of each zone, it nonetheless provides important clueson the physical mechanisms at work. In particular, it is shownthat in order to obtain a consistent see-saw ... Article in Journal/Newspaper Arctic Iceberg* Nordic Seas North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Climate Dynamics 34 7-8 997 1013
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.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
spellingShingle [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
Roche, Didier
Wiersma, Ane
Renssen, Hans
A systematic study of the impact of freshwater pulses with respect to different geographical locations
topic_facet [SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces
environment
description International audience The first comparative and systematic climatemodel study of the sensitivity of the climate response underLast Glacial Maximum (LGM) conditions to freshwaterperturbations at various locations that are known to havereceived significant amounts of freshwater during the LGM(21 kyr BP) climate conditions is presented. A series of tenregions representative of those receiving most of the meltwater from decaying ice-sheets during the deglaciation isdefined, comprising the border of LGM ice-sheets, outlets ofrivers draining part of the melting ice-sheets and iceberg meltzones. The effect of several given freshwater fluxes appliedseparately in each of these regions on regional and globalclimate is subsequently tested. The climate response is thenanalysed both for the atmosphere and oceans. Amongst theregions defined, it is found that the area close by anddynamically upstream to the main deep water formation zonein the North Atlantic are most sensitive to freshwater pulses,as is expected. However, some important differencesbetween Arctic freshwater forcing and Nordic Seas forcingare found, the former having a longer term response linked tosea-ice formation and advection whereas the latter exhibitsmore direct influence of direct freshening of the deep waterformation sites. Combining the common surface temperatureresponse for each respective zone, we fingerprint the particular surface temperature response obtained by addingfreshwater in a particular location. This is done to examine ifa surface climate response can be used to determine theorigin of a meltwater flux, which is relevant for the interpretation of proxy data. We show that it is indeed possible togenerally classify the fingerprints by their origin in terms ofsea-ice modification and modification of deep-water formation. Whilst the latter is not an unambiguous characterization of each zone, it nonetheless provides important clueson the physical mechanisms at work. In particular, it is shownthat in order to obtain a consistent see-saw ...
author2 Department of Earth Sciences Amsterdam
VU University Amsterdam
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE)
Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)
Deltares The Netherlands
format Article in Journal/Newspaper
author Roche, Didier
Wiersma, Ane
Renssen, Hans
author_facet Roche, Didier
Wiersma, Ane
Renssen, Hans
author_sort Roche, Didier
title A systematic study of the impact of freshwater pulses with respect to different geographical locations
title_short A systematic study of the impact of freshwater pulses with respect to different geographical locations
title_full A systematic study of the impact of freshwater pulses with respect to different geographical locations
title_fullStr A systematic study of the impact of freshwater pulses with respect to different geographical locations
title_full_unstemmed A systematic study of the impact of freshwater pulses with respect to different geographical locations
title_sort systematic study of the impact of freshwater pulses with respect to different geographical locations
publisher HAL CCSD
publishDate 2010
url https://hal.archives-ouvertes.fr/hal-03201059
https://hal.archives-ouvertes.fr/hal-03201059/document
https://hal.archives-ouvertes.fr/hal-03201059/file/Roche2010_Article_ASystematicStudyOfTheImpactOfF.pdf
https://doi.org/10.1007/s00382-009-0578-8
geographic Arctic
geographic_facet Arctic
genre Arctic
Iceberg*
Nordic Seas
North Atlantic
genre_facet Arctic
Iceberg*
Nordic Seas
North Atlantic
op_source ISSN: 0930-7575
EISSN: 1432-0894
Climate Dynamics
https://hal.archives-ouvertes.fr/hal-03201059
Climate Dynamics, Springer Verlag, 2010, 34 (7-8), pp.997-1013. ⟨10.1007/s00382-009-0578-8⟩
op_relation info:eu-repo/semantics/altIdentifier/doi/10.1007/s00382-009-0578-8
hal-03201059
https://hal.archives-ouvertes.fr/hal-03201059
https://hal.archives-ouvertes.fr/hal-03201059/document
https://hal.archives-ouvertes.fr/hal-03201059/file/Roche2010_Article_ASystematicStudyOfTheImpactOfF.pdf
doi:10.1007/s00382-009-0578-8
op_rights http://creativecommons.org/licenses/by/
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op_doi https://doi.org/10.1007/s00382-009-0578-8
container_title Climate Dynamics
container_volume 34
container_issue 7-8
container_start_page 997
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