GISS Lunch Seminar Speaker: David Lindo-Atichati (CUNY) Title: What are Eddy fluxes? Biogeochemical Feedbacks from and to the Ocean Abstract: Marine physics influence biogeochemical systems from microscales to planetary scales. Ocean eddies are ubiquitous and highly energetic rotating features of ocean circulation. Their influence on biological and biogeochemical processes stems not only from advective transport but also from the generation of variations in the environment that affect biological and chemical rates. Eddies modulate the marine environment by vertically distributing and laterally stirring water parcels, chemicals, and planktonic organisms. The ephemeral nature of eddies makes it difficult to elucidate the overlaying mechanism of physical-biological-biogeochemical feedbacks. Therefore, the use of multidisciplinary approaches involving sampling, remote sensing, and modeling is necessary. All three aspects are woven through this presentation in an attempt to: 1) bridge long-standing scientific controversies on the signature of eddies on larval-fish distribution, 2) shed light on the transport and fate of underwater hydrocarbon plumes and surface UV filters in estuaries, and 3) build a paradigm-shift in marine biophysics; quantifying the relationship of eddy activity at the length scale of biological community aggregations, where the collective behavior and motion of marine animal might also be relevant to the large scale driven motion of eddies.