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- W2018982997 abstract "Vertical patterns of the natural abundance of 15N (δ15N) for suspended particulate organic nitrogen (PON) for warm-core ring 82-B were found to found reflect vertical patterns in the utilization of NO3− by phytoplankton and the presumed diagenesis of sinking PON on long and short time scales. Temporal variations in the δ15N of PON were strongly associated with the onset of stratification and the removal of NO3− from the euphotic zone. In April, before stratification, euphotic zone values ranged from −2.6 to +3.3 per mil. During stratified conditions, in June, euphotic zone δ15N values were between +4.0 and +11.0 per mil. This shift in the δ15N of PON is attributed, in part, to a decrease in the contribution of isotopic fractionation by phytoplankton NO3− assimilation. It is concluded, however, that the input of Shelf Water or Slope Water PON of high δ15 approximately + 10 per mil) into the ring also could have made a significant contribution to the shift in δ15N values between April and June. The contribution of Shelf Water- or Slope Water-derived PON to ring PON could be as high as 50% in the euphotic zone. A shift in the δ15N of PON at depth in Ring 82-B (400 to 800 m) probably occured in response to the change in euphotic zone δ15N values via the downward particle flux. It is hypothesized that PON at this depth interval had a residence time of about one month." @default.
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- W2018982997 title "Temporal and spatial variations in the natural abundance of 15N in PON from a warm-core ring" @default.
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