Temporal Distribution, Abundance and Variability of Suspended Particulate Matter (Particulate Carbon, Nitrogen and Phosphorus) at Station ALOHA - Observations of a Seasonal Cycle

D. Hebel

Abstract

The currently held dogma of the Subtropical Oligotrophic Gyre is the constancy of environmental parameters resulting in stochastic production events driven by episodic physical forcing. Observations of suspended particulate matter at Station ALOHA have revealed a seasonal cycle (as defined by particulate carbon, nitrogen and phosphorus), occurring during late summer and fall when the water column is usually well stratified and physical forcing at a minimum. The depth specific and temporal distribution and variability of particulate material will be quantified and the component sampled related to the total particulate field. Various biomass indicators (ATP, chl a, C:N:P ratios and dissolved oxygen) may be used to evaluate the partitioning of living and detrital components. Implications and the enigma of the observed seasonal cycle will be discussed.