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Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012

Lookup NU author(s): Professor Sam Wilson

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Abstract

©2015. American Geophysical Union. All Rights Reserved.Time-series observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Time-series program has maintained near-monthly sampling at Station ALOHA (22°45′N, 158°00′W) in the oligotrophic North Pacific Subtropical Gyre (NPSG) since 1988 and has identified ecosystem variability over seasonal to interannual timescales. To further extend the temporal resolution of these near-monthly time-series observations, an extensive field campaign was conducted during July-September 2012 at Station ALOHA with near-daily sampling of upper water-column biogeochemistry, phytoplankton abundance, and activity. The resulting data set provided biogeochemical measurements at high temporal resolution and documents two important events at Station ALOHA: (1) a prolonged period of low productivity when net community production in the mixed layer shifted to a net heterotrophic state and (2) detection of a distinct sea-surface salinity minimum feature which was prominent in the upper water column (0-50 m) for a period of approximately 30 days. The shipboard observations during July-September 2012 were supplemented with in situ measurements provided by Seagliders, profiling floats, and remote satellite observations that together revealed the extent of the low productivity and the sea-surface salinity minimum feature in the NPSG.

Publication metadata

Author(s): Wilson ST, Barone B, Ascani F, Bidigare RR, Church MJ, Del Valle DA, Dyhrman ST, Ferron S, Fitzsimmons JN, Juranek LW, Kolber ZS, Letelier RM, Martinez-Garcia S, Nicholson DP, Richards KJ, Rii YM, Rouco M, Viviani DA, White AE, Zehr JP, Karl DM

Publication type: Article

Publication status: Published

Journal: Global Biogeochemical Cycles

Year: 2015

Volume: 29

Issue: 8

Pages: 1145-1164

Print publication date: 15/09/2015

Online publication date: 14/07/2015

Acceptance date: 10/07/2015

ISSN (print): 0886-6236

ISSN (electronic): 1944-9224

Publisher: Blackwell Publishing Ltd

URL: https://doi.org/10.1002/2015GB005141

DOI: 10.1002/2015GB005141

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