CASPO Seminar - Nicholas Foukal (WHOI)


 
05/08/2019 - 3:30pm
Location: 
NH 101
Event Description: 

Speaker: Nicholas Foukal (WHOI)

Title: Ocean heat transport from the subtropical gyre to the subpolar gyre in the North Atlantic

Abstract:

For decades, the physical oceanographic and climate community has treated the Atlantic meridional overturning circulation (AMOC) and its associated meridional heat transport (MHT) as a source of low-frequency variability in the climate system. However, recent results from satellites, basin-wide in situ monitoring arrays, and a range of models have shown that even the AMOC has strong high-frequency variability that needs to be considered when interpreting long-term trends. In addition, it has been shown that the AMOC in the subtropics does not co-vary with the AMOC at subpolar latitudes on monthly to even decadal time scales. Thus a single measure of the AMOC is not sufficient to summarize its variability over the entire North Atlantic. In this talk, I will discuss a series of papers in which we attempt to bring the MHT literature up-to-date with these new results from the AMOC literature. How is heat conveyed from the subtropical Gulf Stream region to the eastern subpolar gyre? Does a coherent SST pathway exist? How does our recent understanding of a sub-surface connection from the subtropical gyre to the subpolar gyre influence how we expect the inter-gyre MHT to operate? We test a series of mechanisms put forth in the literature using satellite data and simulated Lagrangian trajectories, and then close a heat budget for the eastern subpolar gyre in two ocean circulation models. I will then discuss the implications of our results on seasonal-to-interannual climate predictability and on observed ocean temperature variability such as the warming hole in the subpolar North Atlantic.

For more information on this event, contact: 
Alice Ren
Event Calendar: 
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