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CASPO
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Title: The North Atlantic Warming Hole and AMOC weakening
Abstract: In contrast to most of the global ocean, the surface waters in the central subpolar gyre in the North Atlantic are actually cooling. This, the "North Atlantic Warming Hole" (NAWH), has been cited as proof that the Atlantic Meridional Overturning Circulation (AMOC) is weakening, potentially leading to drastic cooling in Scandinavia. We'll look at the NAWH in models and observations. The results suggest instead the feature is an fundamentally an advective feature,…
Abstract: The Surface Water and Ocean Topography (SWOT) altimetry mission has been shown to resolve sub-10 km scale eddies due to its unprecedented low-instrument error and wide-swath. Recent studies have shown SWOT's capability for deriving ocean circulation at tens of kilometer scales, which is a significant advancement in the state-of-the-art over conventional altimetry. The extend to which the small-scale sea surface height measurement is directly connected to ocean circulation at the smallest resolved scales is an ongoing topic of inquiry. We compare geostrophic…
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Title: Modern tools for modern ocean mixing puzzles
Abstract: It’s well known that climate simulations depend on the magnitude of ocean mixing, but watermass modification depends on the gradient of the mixing - a much higher bar for measurement. As we move towards understanding mixing near fronts and the ocean’s upper and lower boundaries, we require much better accuracy and resolution - and a reexamination of the assumptions we use to compute mixing from microstructure. In this talk, I go over the confusing details of how turbulence leads…
Title: Oceanic melting of Antarctic glaciers: does the tail wag the dog?
Abstract: Oceanic melting of Antarctic ice shelves is a key component of the mass balance of the Antarctic ice sheet, and exerts global influence on climate via its connections to sea level and deep water formation. Previous work has emphasized the role of atmospheric variability in driving changes in warm water access to the bases of the ice shelves, and thus in controlling ice shelf melt rates and triggering glacial retreat. Yet the input of meltwater to the ocean also…
Hello friends and colleagues!
It’s week 1! This week visiting us from the University of New Hampshire, we have Dr. Teri Oehmke, who will be presenting on particle and pollutant transport in complex flows:
“Experiments are a powerful method to study the kinematic transport of pollutants in the environment, specifically those pollutants transported by turbulent flow…