Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences
Variability in the North Atlantic ocean heat transport at 26.5N on short (5-day) timescales is identified and contrasted with different behaviour at monthly intervals using a combination of RAPID/MOCHA/WBTS measurements and the NEMO-LIM2 1/12 ocean circulation/sea ice model. Wind forcing plays the l...
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ftnerc:oai:nora.nerc.ac.uk:515452 2023-05-15T17:26:19+02:00 Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences Moat, Ben Josey, Simon Sinha, Bablu Blaker, Adam Smeed, David McCarthy, Gerard Johns, William Hirschi, Joel Frajka-Williams, Eleanor Rayner, Darren Duchez, Aurelie Coward, Andrew 2016-04-19 http://nora.nerc.ac.uk/id/eprint/515452/ unknown Moat, Ben orcid:0000-0001-8676-7779 Josey, Simon orcid:0000-0002-1683-8831 Sinha, Bablu; Blaker, Adam orcid:0000-0001-5454-0131 Smeed, David orcid:0000-0003-1740-1778 McCarthy, Gerard; Johns, William; Hirschi, Joel; Frajka-Williams, Eleanor; Rayner, Darren orcid:0000-0002-2283-4140 Duchez, Aurelie; Coward, Andrew orcid:0000-0002-9111-7700 . 2016 Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences. In: EGU General Assembly 2016, Vienna, Austria, 17-22 Apr 2016. (Unpublished) Marine Sciences Publication - Conference Item NonPeerReviewed 2016 ftnerc 2023-02-04T19:44:02Z Variability in the North Atlantic ocean heat transport at 26.5N on short (5-day) timescales is identified and contrasted with different behaviour at monthly intervals using a combination of RAPID/MOCHA/WBTS measurements and the NEMO-LIM2 1/12 ocean circulation/sea ice model. Wind forcing plays the leading role in establishing the heat transport variability through the Ekman transport response of the ocean and the associated driving atmospheric conditions vary significantly with timescale. We find that at 5-day timescales the largest changes in the heat transport across 26.5N coincide with north-westerly airflows originating over the American land mass that drive strong southward anomalies in the Ekman flow. During these events the northward heat transport reduces by 0.5-0.7 PW (i.e. about 50% of the mean). In contrast, the Ekman transport response at longer monthly timescales is smaller in magnitude (0.2-0.3 PW) and consistent with expected variations in the leading mode of North Atlantic atmospheric variability, the North Atlantic Oscillation. The north-westerly airflow mechanism can have a prolonged influence beyond the central 5-day timescale and on occasion can reduce the accumulated winter ocean heat transport into the north Atlantic by ~40%. Text North Atlantic North Atlantic oscillation Sea ice Natural Environment Research Council: NERC Open Research Archive |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
topic |
Marine Sciences |
spellingShingle |
Marine Sciences Moat, Ben Josey, Simon Sinha, Bablu Blaker, Adam Smeed, David McCarthy, Gerard Johns, William Hirschi, Joel Frajka-Williams, Eleanor Rayner, Darren Duchez, Aurelie Coward, Andrew Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
topic_facet |
Marine Sciences |
description |
Variability in the North Atlantic ocean heat transport at 26.5N on short (5-day) timescales is identified and contrasted with different behaviour at monthly intervals using a combination of RAPID/MOCHA/WBTS measurements and the NEMO-LIM2 1/12 ocean circulation/sea ice model. Wind forcing plays the leading role in establishing the heat transport variability through the Ekman transport response of the ocean and the associated driving atmospheric conditions vary significantly with timescale. We find that at 5-day timescales the largest changes in the heat transport across 26.5N coincide with north-westerly airflows originating over the American land mass that drive strong southward anomalies in the Ekman flow. During these events the northward heat transport reduces by 0.5-0.7 PW (i.e. about 50% of the mean). In contrast, the Ekman transport response at longer monthly timescales is smaller in magnitude (0.2-0.3 PW) and consistent with expected variations in the leading mode of North Atlantic atmospheric variability, the North Atlantic Oscillation. The north-westerly airflow mechanism can have a prolonged influence beyond the central 5-day timescale and on occasion can reduce the accumulated winter ocean heat transport into the north Atlantic by ~40%. |
format |
Text |
author |
Moat, Ben Josey, Simon Sinha, Bablu Blaker, Adam Smeed, David McCarthy, Gerard Johns, William Hirschi, Joel Frajka-Williams, Eleanor Rayner, Darren Duchez, Aurelie Coward, Andrew |
author_facet |
Moat, Ben Josey, Simon Sinha, Bablu Blaker, Adam Smeed, David McCarthy, Gerard Johns, William Hirschi, Joel Frajka-Williams, Eleanor Rayner, Darren Duchez, Aurelie Coward, Andrew |
author_sort |
Moat, Ben |
title |
Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
title_short |
Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
title_full |
Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
title_fullStr |
Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
title_full_unstemmed |
Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences |
title_sort |
major variations in sub-tropical north atlantic heat transport at short timescales: causes and consequences |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/515452/ |
genre |
North Atlantic North Atlantic oscillation Sea ice |
genre_facet |
North Atlantic North Atlantic oscillation Sea ice |
op_relation |
Moat, Ben orcid:0000-0001-8676-7779 Josey, Simon orcid:0000-0002-1683-8831 Sinha, Bablu; Blaker, Adam orcid:0000-0001-5454-0131 Smeed, David orcid:0000-0003-1740-1778 McCarthy, Gerard; Johns, William; Hirschi, Joel; Frajka-Williams, Eleanor; Rayner, Darren orcid:0000-0002-2283-4140 Duchez, Aurelie; Coward, Andrew orcid:0000-0002-9111-7700 . 2016 Major variations in sub-tropical North Atlantic heat transport at short timescales: causes and consequences. In: EGU General Assembly 2016, Vienna, Austria, 17-22 Apr 2016. (Unpublished) |
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1766117952083460096 |