Journal
JOURNAL OF PLANKTON RESEARCH
Volume 31, Issue 10, Pages 1131-1139Publisher
OXFORD UNIV PRESS
DOI: 10.1093/plankt/fbp064
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Funding
- National Science Foundation [EF-04245999, OCE-0326616, OCE-0117919, OCE-0327513, OCE-0324666, EF-0424599]
- National Aeronautics and Space Administration
- Environmental Protection Agency
- Gordon arid Betty Moore Foundation and by the State of Hawaii
- Directorate For Geosciences
- Division Of Ocean Sciences [0926766] Funding Source: National Science Foundation
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Biological responses to basin-scale climate forcing in the subtropical North Pacific Ocean are assessed based on temporal variations in plankton community structure observed at Station. ALOHA and results of a coupled plysical-biogeochemical model. Observational data and model simulations for the period 1990-2004 reveal distinct temporal patterns, with significant increases in net primary productivity, modeled nitrate flux into the euphotic zone and the measured downward of particulate nitrogen during 1999-2004. Concurrent increases in microalgae, cyanobacteria and modeled and measured zooplankton biomass were also observed during this period. We provide evidence that these responses were a consequence of climate forcing that destratified the upper ocean, making it more susceptible to mixing events and nutrient entrainment. These findigs underscore the importance of nitrate flux and plankton community structure, as modulated by climate forcing, in regulating particle export over interannual and decadal time scales.
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