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The alpha-hydroxyalkyl-hydroperoxides [R-(H)C(-OH)(-OOH), alpha-HH] produced in the ozonolysis of unsaturated organic compounds may contribute to secondary organic aerosol (SOA) aging. alpha-HHs' inherent instability, however, hampers their detection and a positive assessment of their actual role. Here we report, for the first time, the rates and products of the decomposition of the alpha-HHs generated in the ozonolysis of atmospherically important monoterpenes alpha-pinene (alpha-P), d-limonene (d-L), gamma-terpinene (gamma-Tn), and alpha-terpineol (alpha-Tp) in water/acetonitrile (W/AN) mixtures. We detect alpha-HHs and multifunctional decomposition products as chloride adducts by online electrospray ionization mass spectrometry. Experiments involving D2O and (H2O)-O-18, instead of (H2O)-O-16, and an OH-radicalmore »
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Significant rates of export production and nitrogen fixation occur in oligotrophic gyres in spite of low inorganic nutrient concentrations in surface waters. Prior work suggests that dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) are important nutrient sources when inorganic nutrients are scarce. In particular, DOP has been shown to be an important P source for diazotrophs, which may be better suited to using low concentrations of organic vs. inorganic P. Prior modeling work has also suggested that DOP is important for supporting export production in oligotrophic gyres. However, validation of such models is limited by the number ofmore »
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