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

Samuel T. Wilson, Benedetto Barone, Francois Ascani, Robert R. Bidigare, Matthew J. Church, Daniela A. Del Valle, Sonya T. Dyhrman, Sara Ferrõn, Jessica N. Fitzsimmons, Laurie W. Juranek, Zbigniew S. Kolber, Ricardo M. Letelier, Sandra Martínez-García, David P. Nicholson, Kelvin J. Richards, Yoshimi M. Rii, Mõnica Rouco, Donn A. Viviani, Angelicque E. White, Jonathan P. ZehrDavid M. Karl

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)1145-1164
Number of pages20
JournalGlobal Biogeochemical Cycles
Volume29
Issue number8
DOIs
StatePublished - Aug 1 2015

Keywords

  • Station ALOHA
  • biogeochemistry
  • microbial ecology
  • primary productivity
  • temporal variability

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