Oceanography Seminar - Benedetto Barone

November 16, 3:00pm - 4:30pm
Mānoa Campus, Marine Sciences Building 114

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“Mesoscale Biogeochemical Variability North of Hawaii”

Mesoscale 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.

In 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.

The 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.

On 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.

On 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.

These 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.

Event Sponsor
Oceanography, Mānoa Campus

More Information
Anna Neuheimer , (808) 956-2613, annabn@hawaii.edu, 11/16/17 Benedetto Barone (PDF)

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Thursday, November 16
8:30am	Project Management Basics For Tech (C) : Executing, Monitoring and Controlling Honolulu Campus, 874 Dillingham Blvd
10:00am	History Final Oral Mānoa Campus, Sakamaki A-201
10:00am	FAFSA Workshop Honolulu Campus, Building 5, Rm 204
11:15am	Yoga In The Hale West Oʻahu Campus, Kuahuokala
12:00pm	A New Stage of North Korean Nuclear Weapons Challenges Mānoa Campus, Center for Korean Studies Auditorium
12:00pm	“Antonio Taguba, Filipino Americanism, and the Critique of Torture" Mānoa Campus, Kuykendall 409A
2:30pm	Russian Film Week Mānoa Campus, Moore 258
2:30pm	Battalion by Dmitrii Meskhiev Mānoa Campus, Moore Hall 258
2:30pm	Mechanical Engineering Final Oral Mānoa Campus, Kuykendall 301
3:00pm	Mini Film Festival: Asian Martial Arts Cinema (Nov 13-17, 2017) Mānoa Campus, Moore Hall 109
3:00pm	Asian Martial Arts Films series Mānoa Campus, Moore Hall 109
3:00pm	Oceanography Seminar - Benedetto Barone Mānoa Campus, Marine Sciences Building 114
5:30pm	Addressing the “Tough Stuff” of American History Mānoa Campus, Multiple Locations
5:30pm	Sunni & Shi'ites: Why are they divided? Mānoa Campus, Newman Center, 1941 East West Rd, Honolulu, HI 96822
5:30pm	He Named Me Malala Film Screening Mānoa Campus, Krauss Hall 012 (Yukiyoshi Room)
6:30pm	Hanauma Bay Educational Lecture Series Hanauma Bay Nature Preserve Theater