Seminars

Talk abstract:

Global atmospheric `storm-resolving' models with horizontal grid spacing of less than ~5km resolve deep cumulus convection and flow in complex terrain. While computationally expensive, they can be run for yearlong scales and can serve as reference models for improving more economical coarse-grid global weather and climate models. Machine learning (ML) offers an avenue for translating the patterns seen in storm-resolving models onto the coarser grid, with the ultimate goal of reducing uncertainties in regional precipitation and temperature trends in global…

Talk Abstract: TBA

Talk Abstract:

While much attention has been given to understanding how anthropogenic greenhouse gas emissions influence the mean state of the climate system, far less scrutiny has been paid to how they may modulate naturally occurring modes of climate variability.  In this talk, I will present a new analysis of projected changes in the patterns and amplitudes of atmospheric circulation variability over the North Pacific and North America based on a novel set of global climate model simulations. As climate change…

Please join us on Zoom for the Marine Biology seminar where Dr. Anita Giraldo Ospina (University of Western Australia/UCSB) will present:

Talk Abstract:

Coastal upwelling rates are classically determined by the intensity of the upper-ocean offshore Ekman transport. But (sub-)mesoscale turbulence modulates offshore transport, hence the net upwelling rate. Eddy effects generally oppose the Ekman circulation, resulting in so-called “eddy cancellation”, a process well studied in the Southern Ocean. Here we investigate how air-sea heat/buoyancy fluxes modulate eddy cancellation in an idealized upwelling model. We run CROCO simulations with constant winds but varying heat fluxes with and without…

Please join us on Zoom for the Marine Biology seminar where Dr. Rika Anderson (Carleton College) will present:

"Wonders of the Deep: Microbial ecology and evolution deep-sea hydrothermal vents"

Talk Abstract:

Oceanic lee waves are generated when quasi-steady flows interact with rough topography at the bottom of the ocean. These internal waves provide an important sink of energy and momentum from the mean flow, especially in the Southern Ocean where they are a leading order mechanism for diapycnal mixing. Linear theory with a spectral representation of abyssal hill topography is generally used to estimate lee wave generation for use in parameterisations, and has been verified against idealised simulations. Here, we use a realistic wave resolving simulation of the Drake…

Please join us on Zoom for the Marine Biology seminar with Dr. Linda Wegley Kelly of Scripps Institution of Oceanography.

Talk Abstract:

Ocean turbulence transfers energy across scales, and is a key ingredient in shaping the ocean circulation. Conventional turbulence dynamics suggests that the kinetic energy in the ocean is transferred primarily to larger scales, via the inverse energy cascade that emerges under the influence of Earth's rotation. This raises the question of how dissipation is achieved in oceanic flows, which would necessarily require an energy transfer towards the small molecular scales. It has been argued that flows that…

Join us for a discussion as we explore the role of research in social justice, globally and locally, in celebration of World Day of Social Justice and hear an update from the Research Affairs Equity, Diversity and Inclusion (EDI) Committee. Please email specific questions to rci@ucsd.edu and these will be provided anonymously to the speakers in advance of the session (questions may also be asked at the session).

Click here to register.