Simulating Heinrich event 1 with interactive icebergs
During the last glacial, major abrupt climate events known as Heinrich events left distinct fingerprints of ice rafted detritus, and are thus associated with iceberg armadas; the release of many icebergs into the North Atlantic Ocean. We simulated the impact of a large armada of icebergs on glacial...
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Language: | English |
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2013
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Online Access: | https://research.vu.nl/en/publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c https://doi.org/10.1007/s00382-012-1421-1 http://download.springer.com/static/pdf/286/art%253A10.1007%252Fs00382-012-1421-1.pdf?auth66=1363182916_a0ce287a2efb24123d03b5dd405ea9fd&ext=.pdf |
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ftvuamstcris:oai:research.vu.nl:publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c 2024-09-15T18:19:02+00:00 Simulating Heinrich event 1 with interactive icebergs Jongma, J.I. Renssen, H. Roche, D.M.V.A.P. 2013 https://research.vu.nl/en/publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c https://doi.org/10.1007/s00382-012-1421-1 http://download.springer.com/static/pdf/286/art%253A10.1007%252Fs00382-012-1421-1.pdf?auth66=1363182916_a0ce287a2efb24123d03b5dd405ea9fd&ext=.pdf eng eng https://research.vu.nl/en/publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c info:eu-repo/semantics/openAccess Jongma , J I , Renssen , H & Roche , D M V A P 2013 , ' Simulating Heinrich event 1 with interactive icebergs ' , Climate Dynamics , vol. 40 , no. 5-6 , pp. 1373-1385 . https://doi.org/10.1007/s00382-012-1421-1 /dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water article 2013 ftvuamstcris https://doi.org/10.1007/s00382-012-1421-1 2024-06-26T23:47:28Z During the last glacial, major abrupt climate events known as Heinrich events left distinct fingerprints of ice rafted detritus, and are thus associated with iceberg armadas; the release of many icebergs into the North Atlantic Ocean. We simulated the impact of a large armada of icebergs on glacial climate in a coupled atmosphere-ocean model. In our model, dynamic-thermodynamic icebergs influence the climate through two direct effects. First, melting of the icebergs causes freshening of the upper ocean, and second, the latent heat used in the phase-transition of ice to water results in cooling of the iceberg surroundings. This cooling effect of icebergs is generally neglected in models. We investigated the role of the latent heat by performing a sensitivity experiment in which the cooling effect is switched off. At the peak of the simulated Heinrich event, icebergs lacking the latent heat flux are much less efficient in shutting down the meridional overturning circulation than icebergs that include both the freshening and the cooling effects. The cause of this intriguing result must be sought in the involvement of a secondary mechanism: facilitation of sea-ice formation, which can disturb deep water production at key convection sites, with consequences for the thermohaline circulation. We performed additional sensitivity experiments, designed to explore the effect of the more plausible distribution of the dynamic icebergs' melting fluxes compared to a classic hosing approach with homogeneous spreading of the melt fluxes over a section in the mid-latitude North Atlantic (NA) Ocean. The early response of the climate system is much stronger in the iceberg experiments than in the hosing experiments, which must be a distribution-effect: the dynamically distributed icebergs quickly affect western NADW formation, which synergizes with direct sea-ice facilitation, causing an earlier sea-ice expansion and climatic response. Furthermore, compared to dynamic-thermodynamic icebergs, a homogeneous hosing overestimates the ... Article in Journal/Newspaper NADW North Atlantic Sea ice Vrije Universiteit Amsterdam (VU): Research Portal Climate Dynamics 40 5-6 1373 1385 |
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Open Polar |
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Vrije Universiteit Amsterdam (VU): Research Portal |
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ftvuamstcris |
language |
English |
topic |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
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/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water Jongma, J.I. Renssen, H. Roche, D.M.V.A.P. Simulating Heinrich event 1 with interactive icebergs |
topic_facet |
/dk/atira/pure/sustainabledevelopmentgoals/life_below_water name=SDG 14 - Life Below Water |
description |
During the last glacial, major abrupt climate events known as Heinrich events left distinct fingerprints of ice rafted detritus, and are thus associated with iceberg armadas; the release of many icebergs into the North Atlantic Ocean. We simulated the impact of a large armada of icebergs on glacial climate in a coupled atmosphere-ocean model. In our model, dynamic-thermodynamic icebergs influence the climate through two direct effects. First, melting of the icebergs causes freshening of the upper ocean, and second, the latent heat used in the phase-transition of ice to water results in cooling of the iceberg surroundings. This cooling effect of icebergs is generally neglected in models. We investigated the role of the latent heat by performing a sensitivity experiment in which the cooling effect is switched off. At the peak of the simulated Heinrich event, icebergs lacking the latent heat flux are much less efficient in shutting down the meridional overturning circulation than icebergs that include both the freshening and the cooling effects. The cause of this intriguing result must be sought in the involvement of a secondary mechanism: facilitation of sea-ice formation, which can disturb deep water production at key convection sites, with consequences for the thermohaline circulation. We performed additional sensitivity experiments, designed to explore the effect of the more plausible distribution of the dynamic icebergs' melting fluxes compared to a classic hosing approach with homogeneous spreading of the melt fluxes over a section in the mid-latitude North Atlantic (NA) Ocean. The early response of the climate system is much stronger in the iceberg experiments than in the hosing experiments, which must be a distribution-effect: the dynamically distributed icebergs quickly affect western NADW formation, which synergizes with direct sea-ice facilitation, causing an earlier sea-ice expansion and climatic response. Furthermore, compared to dynamic-thermodynamic icebergs, a homogeneous hosing overestimates the ... |
format |
Article in Journal/Newspaper |
author |
Jongma, J.I. Renssen, H. Roche, D.M.V.A.P. |
author_facet |
Jongma, J.I. Renssen, H. Roche, D.M.V.A.P. |
author_sort |
Jongma, J.I. |
title |
Simulating Heinrich event 1 with interactive icebergs |
title_short |
Simulating Heinrich event 1 with interactive icebergs |
title_full |
Simulating Heinrich event 1 with interactive icebergs |
title_fullStr |
Simulating Heinrich event 1 with interactive icebergs |
title_full_unstemmed |
Simulating Heinrich event 1 with interactive icebergs |
title_sort |
simulating heinrich event 1 with interactive icebergs |
publishDate |
2013 |
url |
https://research.vu.nl/en/publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c https://doi.org/10.1007/s00382-012-1421-1 http://download.springer.com/static/pdf/286/art%253A10.1007%252Fs00382-012-1421-1.pdf?auth66=1363182916_a0ce287a2efb24123d03b5dd405ea9fd&ext=.pdf |
genre |
NADW North Atlantic Sea ice |
genre_facet |
NADW North Atlantic Sea ice |
op_source |
Jongma , J I , Renssen , H & Roche , D M V A P 2013 , ' Simulating Heinrich event 1 with interactive icebergs ' , Climate Dynamics , vol. 40 , no. 5-6 , pp. 1373-1385 . https://doi.org/10.1007/s00382-012-1421-1 |
op_relation |
https://research.vu.nl/en/publications/b526756b-8580-4baf-a6cc-b3ef1c3f116c |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1007/s00382-012-1421-1 |
container_title |
Climate Dynamics |
container_volume |
40 |
container_issue |
5-6 |
container_start_page |
1373 |
op_container_end_page |
1385 |
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1810457126304219136 |