Speaker: Ali Siddiqui, postdoctoral research associate; Department of Earth, Environmental and Planetary Sciences; Brown University
This talk will focus on mechanisms of heat and freshwater variability in the subpolar North Atlantic and the Arctic oceans. The upper ocean salinity in the eastern subpolar North Atlantic undergoes decadal fluctuations. A large fresh anomaly event occurred during 2012–2016.
Siddiqui will discuss the mechanisms of this low salinity event with those of the 1990s fresh anomaly event using the ECCOv4r4 state estimate. For the Arctic, he will discuss a decomposition of the solar forcing of the Arctic Ocean into ice-edge, ice-albedo, and solar forcing-related effects. It is an effort to reimagine the traditional Budyko-Sellers type sea ice albedo feedback mechanism.
Siddiqui will also summarize current understandings of the two-way interaction between the Arctic and the AMOC. The research presented will be a combination of work carried out during Siddiqui’s PhD and ongoing postdoc.