27_hydrothermal - Patchiness GS222 D. Lund Lecture 26b...

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Unformatted text preview: Patchiness GS222 D. Lund Lecture 26b Eddies Swirling, vortex-like motions that are ubiquitous in the ocean Ocean is NOT of uniform temperature, salinity and nutrient contents Eddies most easily observed near fronts, or boundaries between water of different T and S Patchiness in water type and nutrient content drives ecological variations at small spatial scales Oceanic eddies Gulfstream rings Warm and cold-core rings: 100-300 km in diameter, surrounded by swift currents, persist for weeks to months. Cold-core rings: -persist longer (deeper water)-primary mechanism for getting nutrient-rich water south of Gulf Stream Warm-core rings: - nutrient-depleted water from subtropical gyre (Sargasso Sea)-important for transporting heat across the Gulf Stream-sometimes contain Sargassum communities Global productivity Phytoplankton community Hydrothermal Systems GS222 D. Lund Lecture 27 Overview - this lecture Basic ingredients for life Hydrothermal circulation Chemosynthetic bacteria and tube worms The role of sunlight Basis for life Photosynthesis: dominant form of primary production in the ocean and on land Requires : water, CO 2 , nutrients, energy...
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This note was uploaded on 01/20/2012 for the course GEO 222 taught by Professor Davidlund during the Winter '11 term at University of Michigan.

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27_hydrothermal - Patchiness GS222 D. Lund Lecture 26b...

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