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Role of ENSO Conditions on Particulate Organic Matter Concentrations and Elemental Ratios in the Southern California Bight

El Niño Southern Oscillation (ENSO) influences multi-year variation in sea-surface temperature and the intensity of upwelling in many Pacific regions. However, it is currently unknown how El Niño conditions will affect the concentration and elemental ratios of particulate organic matter (POM). To te...

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Published in:Frontiers in Marine Science 2019-07, Vol.6
Main Authors: Fagan, Adam J., Moreno, Allison R., Martiny, Adam C.
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description El Niño Southern Oscillation (ENSO) influences multi-year variation in sea-surface temperature and the intensity of upwelling in many Pacific regions. However, it is currently unknown how El Niño conditions will affect the concentration and elemental ratios of particulate organic matter (POM). To test this, we have been quantifying POM weekly for six years (2012 to 2017) at the MICRO time-series station in the Southern California Bight. We found a strong influence of the 2015 El Niño on sea-surface temperature and phosphate concentration but to a lesser extent on nitrate availability. The 2015 El Niño also resulted in low POC and POP concentrations, whereas PON concentrations declined by 26% during the whole sampling period. The changes in POM concentrations led to high C:P and N:P ratios. Following the changes in PON, C:N continued to climb reaching ~9.4 at the end of the sampling. We suggest that an Eastern Pacific- vs. a Central Pacific-type El Niño as well as a switch in the Pacific Decadal Oscillation phase influenced the local response in POM concentrations and ratios.
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subjects Biogeochemistry
Biomass
Carbon
ecological stoichiometry
Ecosystem biology
Ecosystems
El Nino
El Nino phenomena
ENSO
Environmental conditions
marine
MICRO
Ocean circulation
Organic matter
Particulate organic matter
Phosphates
Physiology
Plankton
Ratios
redfield
Sampling
Sea surface temperature
Southern Oscillation
Temperature
Upwelling
title Role of ENSO Conditions on Particulate Organic Matter Concentrations and Elemental Ratios in the Southern California Bight
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