Short-term variability in euphotic zone biogeochemistry and primary productivity at Station ALOHA: A case study of summer 2012
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AbstractTimeseries observations are critical to understand the structure, function, and dynamics of marine ecosystems. The Hawaii Ocean Timeseries program has maintained nearmonthly sampling at Station ALOHA (2245N, 15800W) 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 nearmonthly timeseries observations, an extensive field campaign was conducted during JulySeptember 2012 at Station ALOHA with neardaily sampling of upper watercolumn 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 seasurface salinity minimum feature which was prominent in the upper water column (050 m) for a period of approximately 30 days. The shipboard observations during JulySeptember 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 seasurface salinity minimum feature in the NPSG.
Wilson, S. T., Barone, B., Ascani, F., Bidigare, R. R., Church, M. J., del Valle, D. A., ... Karl, D. M.
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Wilson, Samuel T||Barone, Benedetto||Ascani, Francois||Bidigare, Robert R||Church, Matthew J||del Valle, Daniela A||Dyhrman, Sonya T||Ferron, Sara||Fitzsimmons, Jessica N||Juranek, Laurie W||Kolber, Zbigniew S||Letelier, Ricardo M||Martinez-Garcia, Sandra||Nicholson, David P||Richards, Kelvin J||Rii, Yoshimi M||Rouco, Monica||Viviani, Donn A||White, Angelicque E||Zehr, Jonathan P||Karl, David M
