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Author(s): Fagan, AJ; Moreno, AR; Martiny, AC | Abstract: © 2019 Fagan, Moreno and Martiny. El Nino 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 Nino conditions will affect the concentration and elemental ratios of particulate organic matter (POM). To investigate this, we have quantified POM weekly for 6 years (2012 to 2017) at the MICRO time-series station in the Southern California Bight. We found a strong influence of the 2015 El Nino on sea-surface temperature and phosphate concentration but to a lesser extent on nitrate availability. The 2015 El Nino also resulted in a short-term depression in POC and POP concentrations, whereas PON concentrations displayed an independent long-term decline regardless of the El Nino event. Reduced POM concentrations resulting from the 2015 El Nino occurred in parallel 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 our sampling period. We suggest that an Eastern Pacific- vs. a Central Pacific-type El Nino as well as a switch in the Pacific Decadal Oscillation phase significantly altered the local response in POM concentrations and ratios.

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