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Lookup NU author(s): Professor Sam Wilson
This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).
©2015. The Authors.Using autonomous underwater gliders, we quantified diurnal periodicity in dissolved oxygen, chlorophyll, and temperature in the subtropical North Pacific near the Hawaii Ocean Time-series (HOT) Station ALOHA during summer 2012. Oxygen optodes provided sufficient stability and precision to quantify diel cycles of average amplitude of 0.6 μmol kg-1. A theoretical diel curve was fit to daily observations to infer an average mixed layer gross primary productivity (GPP) of 1.8 mmol O2 m-3 d-1. Cumulative net community production (NCP) over 110 days was 500 mmol O2 m-2 for the mixed layer, which averaged 57 m in depth. Both GPP and NCP estimates indicated a significant period of below-average productivity at Station ALOHA in 2012, an observation confirmed by 14C productivity incubations and O2/Ar ratios. Given our success in an oligotrophic gyre where biological signals are small, our diel GPP approach holds promise for remote characterization of productivity across the spectrum of marine environments.
Author(s): Nicholson DP, Wilson ST, Doney SC, Karl DM
Publication type: Article
Publication status: Published
Journal: Geophysical Research Letters
Year: 2015
Volume: 42
Issue: 10
Pages: 4032-4039
Print publication date: 28/05/2015
Online publication date: 29/04/2015
Acceptance date: 28/04/2015
Date deposited: 16/12/2021
ISSN (print): 0094-8276
ISSN (electronic): 1944-8007
Publisher: Wiley-Blackwell Publishing, Inc.
URL: https://doi.org/10.1002/2015GL063065
DOI: 10.1002/2015GL063065
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