[OCES seminar] Impact of Fine-Scale Currents on Biogeochemical Cycles in a Changing Ocean
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Fine-scale currents, O(1-100 km, days-months), are actively involved in the transport and transformation of biogeochemical tracers in the ocean. However, their overall impact on large-scale biogeochemical cycling on the timescale of years remains poorly understood due to the multiscale nature of the problem. Here, I will summarize these impacts and critically review current estimates. I will examine how eddy fluxes and upscale connections enter into the large-scale balance of biogeochemical tracers. I will show that the overall contribution of eddy fluxes to primary production and carbon export may not be as large as it is for oxygen ventilation. I will highlight the importance of fine scales to low-frequency natural variability through upscale connections and show that they may also buffer the negative effects of climate change on the functioning of biogeochemical cycles.
Marina Lévy is the director of the Sorbonne University Alliance Ocean Institute. She received her PhD in Oceanography from Sorbonne University in 1996 and is an active research scientist working at the LOCEAN-IPSL Ocean and Climate Laboratory in Paris, France. Her work focusses on the interactions between turbulent ocean currents and marine biology, with the ultimate goal of improving model projections of ocean stressors in response to climate change. She is deeply engaged in public awareness and corporate outreach on ocean-related challenges.
The speaker will also be giving a symposium talk; see https://calendar.hkust.edu.hk/events/ocean-science-societal-action-story-behind-starfish-barometer.