Rapid cooling and increased storminess triggered by freshwater in the North Atlantic
Recent winters have been unique due to the rapid and extreme cooling of the subpolar North Atlantic. Here, we present a novel view on its causes and consequences. Combining in‐situ observations with remote sensing and atmospheric reanalysis data, we show that increased freshening of the subpolar reg...
Published in: | Geophysical Research Letters |
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Online Access: | http://nora.nerc.ac.uk/id/eprint/528179/ https://nora.nerc.ac.uk/id/eprint/528179/1/SI.pdf https://nora.nerc.ac.uk/id/eprint/528179/2/freshwater.pdf https://nora.nerc.ac.uk/id/eprint/528179/13/2020GL087207.pdf https://doi.org/10.1029/2020GL087207 |
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ftnerc:oai:nora.nerc.ac.uk:528179 2023-05-15T17:26:19+02:00 Rapid cooling and increased storminess triggered by freshwater in the North Atlantic Oltmanns, M. Karstensen, J. Moore, G. W. K. Josey, S. A. 2020-07-28 text http://nora.nerc.ac.uk/id/eprint/528179/ https://nora.nerc.ac.uk/id/eprint/528179/1/SI.pdf https://nora.nerc.ac.uk/id/eprint/528179/2/freshwater.pdf https://nora.nerc.ac.uk/id/eprint/528179/13/2020GL087207.pdf https://doi.org/10.1029/2020GL087207 en eng https://nora.nerc.ac.uk/id/eprint/528179/1/SI.pdf https://nora.nerc.ac.uk/id/eprint/528179/2/freshwater.pdf https://nora.nerc.ac.uk/id/eprint/528179/13/2020GL087207.pdf Oltmanns, M. orcid:0000-0002-8959-4938 Karstensen, J.; Moore, G. W. K.; Josey, S. A. orcid:0000-0002-1683-8831 . 2020 Rapid cooling and increased storminess triggered by freshwater in the North Atlantic. Geophysical Research Letters, 47 (14), e2020GL087207. https://doi.org/10.1029/2020GL087207 <https://doi.org/10.1029/2020GL087207> cc_by_4 CC-BY Publication - Article PeerReviewed 2020 ftnerc https://doi.org/10.1029/2020GL087207 2023-02-04T19:50:55Z Recent winters have been unique due to the rapid and extreme cooling of the subpolar North Atlantic. Here, we present a novel view on its causes and consequences. Combining in‐situ observations with remote sensing and atmospheric reanalysis data, we show that increased freshening of the subpolar region gives rise to a faster surface cooling in fall and winter. Large freshwater events, in particular, result in pronounced cold anomalies with sharp temperature gradients that promote an enhanced storminess. The storms reinforce the cooling by driving stronger heat losses and modulating the surface flow. Consistent with this mechanism, past freshwater events have been followed by cold anomalies in winter of ~‐2°C and increases in the North Atlantic Oscillation index of up to~0.6 within 3 years. We expect that future freshwater discharges into the North Atlantic will amplify the cold anomaly and trigger an enhanced wintertime storminess with far‐reaching climatic implications. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Natural Environment Research Council: NERC Open Research Archive Geophysical Research Letters 47 14 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Recent winters have been unique due to the rapid and extreme cooling of the subpolar North Atlantic. Here, we present a novel view on its causes and consequences. Combining in‐situ observations with remote sensing and atmospheric reanalysis data, we show that increased freshening of the subpolar region gives rise to a faster surface cooling in fall and winter. Large freshwater events, in particular, result in pronounced cold anomalies with sharp temperature gradients that promote an enhanced storminess. The storms reinforce the cooling by driving stronger heat losses and modulating the surface flow. Consistent with this mechanism, past freshwater events have been followed by cold anomalies in winter of ~‐2°C and increases in the North Atlantic Oscillation index of up to~0.6 within 3 years. We expect that future freshwater discharges into the North Atlantic will amplify the cold anomaly and trigger an enhanced wintertime storminess with far‐reaching climatic implications. |
format |
Article in Journal/Newspaper |
author |
Oltmanns, M. Karstensen, J. Moore, G. W. K. Josey, S. A. |
spellingShingle |
Oltmanns, M. Karstensen, J. Moore, G. W. K. Josey, S. A. Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
author_facet |
Oltmanns, M. Karstensen, J. Moore, G. W. K. Josey, S. A. |
author_sort |
Oltmanns, M. |
title |
Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
title_short |
Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
title_full |
Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
title_fullStr |
Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
title_full_unstemmed |
Rapid cooling and increased storminess triggered by freshwater in the North Atlantic |
title_sort |
rapid cooling and increased storminess triggered by freshwater in the north atlantic |
publishDate |
2020 |
url |
http://nora.nerc.ac.uk/id/eprint/528179/ https://nora.nerc.ac.uk/id/eprint/528179/1/SI.pdf https://nora.nerc.ac.uk/id/eprint/528179/2/freshwater.pdf https://nora.nerc.ac.uk/id/eprint/528179/13/2020GL087207.pdf https://doi.org/10.1029/2020GL087207 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
https://nora.nerc.ac.uk/id/eprint/528179/1/SI.pdf https://nora.nerc.ac.uk/id/eprint/528179/2/freshwater.pdf https://nora.nerc.ac.uk/id/eprint/528179/13/2020GL087207.pdf Oltmanns, M. orcid:0000-0002-8959-4938 Karstensen, J.; Moore, G. W. K.; Josey, S. A. orcid:0000-0002-1683-8831 . 2020 Rapid cooling and increased storminess triggered by freshwater in the North Atlantic. Geophysical Research Letters, 47 (14), e2020GL087207. https://doi.org/10.1029/2020GL087207 <https://doi.org/10.1029/2020GL087207> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2020GL087207 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
14 |
_version_ |
1766117936854990848 |