Impact of Ekman Pumping on the Meridional Coherence of the AMOC
Abstract The effect of wind‐induced vertical velocity on the meridional coherence of Atlantic meridional overtuning circulation (AMOC) is examined using theory, observations, and a numerical model. Two cases are considered: (a) the AMOC computed in depth coordinates and (b) the AMOC computed in isop...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL108846 |
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| author | Neil J. Fraser Alan D. Fox Stuart A. Cunningham |
| author_facet | Neil J. Fraser Alan D. Fox Stuart A. Cunningham |
| author_sort | Neil J. Fraser |
| collection | DOAJ |
| description | Abstract The effect of wind‐induced vertical velocity on the meridional coherence of Atlantic meridional overtuning circulation (AMOC) is examined using theory, observations, and a numerical model. Two cases are considered: (a) the AMOC computed in depth coordinates and (b) the AMOC computed in isopycnal coordinates. In depth space, the difference between the AMOC at different latitudes is largely explained by vertical transport across the 1000m depth surface induced by Ekman pumping. In density space, this difference is explained by Ekman‐driven heave of the neutral surface separating the upper and lower limbs. This adiabatic “sloshing” changes the relative volumes of the upper and lower AMOC limbs, obscuring the distribution and advection of the diapycnal transports which characterize the AMOC. |
| format | Article |
| id | doaj-art-a78ad87fd91a4f7e97968eb867dff54b |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-a78ad87fd91a4f7e97968eb867dff54b2025-01-20T13:05:57ZengWileyGeophysical Research Letters0094-82761944-80072025-01-01521n/an/a10.1029/2024GL108846Impact of Ekman Pumping on the Meridional Coherence of the AMOCNeil J. Fraser0Alan D. Fox1Stuart A. Cunningham2The Scottish Association for Marine Science Oban UKThe Scottish Association for Marine Science Oban UKThe Scottish Association for Marine Science Oban UKAbstract The effect of wind‐induced vertical velocity on the meridional coherence of Atlantic meridional overtuning circulation (AMOC) is examined using theory, observations, and a numerical model. Two cases are considered: (a) the AMOC computed in depth coordinates and (b) the AMOC computed in isopycnal coordinates. In depth space, the difference between the AMOC at different latitudes is largely explained by vertical transport across the 1000m depth surface induced by Ekman pumping. In density space, this difference is explained by Ekman‐driven heave of the neutral surface separating the upper and lower limbs. This adiabatic “sloshing” changes the relative volumes of the upper and lower AMOC limbs, obscuring the distribution and advection of the diapycnal transports which characterize the AMOC.https://doi.org/10.1029/2024GL108846AMOCclimateAtlanticOSNAPRAPIDcontinuity |
| spellingShingle | Neil J. Fraser Alan D. Fox Stuart A. Cunningham Impact of Ekman Pumping on the Meridional Coherence of the AMOC Geophysical Research Letters AMOC climate Atlantic OSNAP RAPID continuity |
| title | Impact of Ekman Pumping on the Meridional Coherence of the AMOC |
| title_full | Impact of Ekman Pumping on the Meridional Coherence of the AMOC |
| title_fullStr | Impact of Ekman Pumping on the Meridional Coherence of the AMOC |
| title_full_unstemmed | Impact of Ekman Pumping on the Meridional Coherence of the AMOC |
| title_short | Impact of Ekman Pumping on the Meridional Coherence of the AMOC |
| title_sort | impact of ekman pumping on the meridional coherence of the amoc |
| topic | AMOC climate Atlantic OSNAP RAPID continuity |
| url | https://doi.org/10.1029/2024GL108846 |
| work_keys_str_mv | AT neiljfraser impactofekmanpumpingonthemeridionalcoherenceoftheamoc AT alandfox impactofekmanpumpingonthemeridionalcoherenceoftheamoc AT stuartacunningham impactofekmanpumpingonthemeridionalcoherenceoftheamoc |