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Hourly (x) and campaign average (☐) fraction of select pONs to the total pONs plotted as a function of time of day. Species in a given carbon number subgroup can exhibit similar but not identical diel trends. For instance, whereas the abundance of (A) C5H7NO7 is immediately enhanced following sunrise (∼0530 h), that of (C) C5H9NO7 starts to increase around 1100 h (local). Diel trends for (B) C10H17NO7 and (D) C10H17NO8 are also similar, but not identical.
