A Sea of Change: Biogeochemical Variability in the North Pacific Subtropical Gyre

@article{Karl1999ASO,
  title={A Sea of Change: Biogeochemical Variability in the North Pacific Subtropical Gyre},
  author={David M. Karl},
  journal={Ecosystems},
  year={1999},
  volume={2},
  pages={181-214}
}
  • D. Karl
  • Published 1 May 1999
  • Environmental Science
  • Ecosystems
ABSTRACT The North Pacific Subtropical Gyre (NPSG) is the largest ecosystem on our planet. However, this expansive habitat is also remote, poorly sampled, and therefore not well understood. For example, the most abundant oxygenic phototroph in the NPSG, Prochlorococcus, was described only a decade ago. Other novel Bacteria, Archaea and Eukarya, recently identified by nucleic acid sequence analysis, have not been isolated. In October 1988, an ocean time-series research program was established to… 
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References

SHOWING 1-10 OF 253 REFERENCES
Scales of Variability in a Stable Environment: Phytoplankton in the Central North Pacific
TLDR
This Central Pacific Study has its roots in the California Cooperative Oceanic Fisheries Investigations (CalCOFI), an interagency study originally established to understand the disappearance of the sardines from the California Current.
Ecosystem changes in the North Pacific subtropical gyre attributed to the 1991–92 El Niño
SUBTROPICAL ocean gyres are considered to be the marine analogues of terrestrial deserts because of chronic nutrient depletion and low standing stocks of organisms1. Despite their presumed low rates…
Molecular Approaches to Microbial Biomass Estimation in the Sea
The marine environment is the largest contiguous habitat on Earth. It is composed of several distinct ecosystems including high-latitude (polar) zones, mid-latitude open-ocean gyres, equatorial…
Impact of an atmospheric-oceanic disturbance on phytoplankton community dynamics in the North Pacific Central Gyre
Influence of mesoscale eddies on new production in the Sargasso Sea
It is problematic that geochemical estimates of new production — that fraction of total primary production in surface waters fuelled by externally supplied nutrients — in oligotrophic waters of the…
Overview of the U.S. JGOFS Bermuda Atlantic Time-series Study and the Hydrostation S program
Mixing and oceanic productivity
The role of nitrogen fixation in biogeochemical cycling in the subtropical North Pacific Ocean
Seven years of time-series observations of biogeochemical processes in the subtropical North Pacific Ocean gyre have revealed dramatic changes in the microbial community structure and in the…
The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific Ocean
Based on a long‐term set of observations and measurements at a station in the subtropical North Pacific Ocean, it now appears that contemporaneous rates of primary production in low‐nutrient open…
Vertical fluxes of carbon, nitrogen, and phosphorus in the North Pacific Subtropical Gyre near Hawaii
The hypothesized “biological pump” mechanism for removing carbon from the euphotic zone to the deep ocean requires different rates of recycling of C, N, and P in sinking particles. At Station ALOHA…
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