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CREATED:20261009T234146Z
DESCRIPTION:“Mesoscale Biogeochemical Variability North of Hawaii”\n\nMesoscale motions in the ocean influence the structure and function of pelagic ecosystems through different mechanisms, but a comprehensive understanding of their ecological impact is still missing. \n\nIn this talk, I will describe the mesoscale biogeochemical variability observed north of the Hawaiian archipelago from 1) a retrospective analyses of the Hawaii Ocean Time-series, and 2) preliminary analyses on targeted observations from mesoscale eddies of different polarity.\n\nThe comparison of twenty-three years of satellite observations and biogeochemical measurements from Station ALOHA shows that sea surface height controls the depth of isopycnal surfaces and is associated with numerous biogeochemical changes in different layers of the water column. In waters below ~100 m depth, increases in sea surface height are associated with increases in organic matter and decreases in inorganic nutrients, consistent with predicted consequences of the vertical displacement of water layers. At the depth of the chlorophyll maximum, increases in sea surface height are associated with decreases in vertical gradients of inorganic nutrients and in the abundance of eukaryotic phytoplankton. Above the chlorophyll maximum, dissolved phosphorus enigmatically increases with sea surface height, despite the depression of nutrient-rich, deep waters.\n\n\nOn the one hand, the observations from targeted sampling of mesoscale eddies using ships and autonomous profilers confirm some of the results from the retrospective analysis of the Hawaii Ocean Time-series. \n\nOn the other hand, optical and acoustical measurements from these cruises captured marked ecological differences between cyclonic and anticyclonic eddies that were not evident from filtration-based measurements.\n\n\nThese analyses show that mesoscale dynamics cause predictable changes in the ecosystem of the North Pacific Subtropical Gyre, and that mesoscale motions are inextricably linked to ocean biogeochemistry and microbial dynamics.\n
DTEND;TZID=Pacific/Honolulu:20171117T023000Z
DTSTAMP:20261009T234146Z
DTSTART;TZID=Pacific/Honolulu:20171117T010000Z
LAST-MODIFIED:20261009T234146Z
LOCATION:Marine Sciences Building 114
PRIORITY:5
SEQUENCE:0
SUMMARY;LANGUAGE=en-us:Oceanography Seminar - Benedetto Barone 
TRANSP:OPAQUE
UID:179162530632201web-support-l@lists.hawaii.edu
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