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Isoprene hydroxynitrates (IN) are tracers of the photochemical oxidation ofisoprene in high NOx environments. Production and loss of IN have asignificant influence on the NOx cycle and tropospheric O3chemistry. To better understand IN chemistry, a series of photochemicalreaction chamber experiments was conducted to determine the IN yield fromisoprene photooxidation at high NO concentrations (> 100 ppt). Bycombining experimental data and calculated isomer distributions, a total INyield of 9(+4/−3) % was derived. The result was applied in azero-dimensional model to simulate production and loss of ambient INobserved in a temperate forest atmosphere, during the Southern Oxidant andAerosol Study (SOAS) field campaign, from 27 May to 11 July 2013. The 9 %yield was consistent with the observed IN/(MVK+MACR) ratios observedduring SOAS. By comparing field observations with model simulations, weidentified NO as the limiting factor for ambient IN production during SOAS,but vertical mixing at dawn might also contribute (~ 27 %)to IN dynamics. A close examination of isoprene's oxidation productsindicates that its oxidation transitioned from a high-NO dominant chemicalregime in the morning into a low-NO dominant regime in the afternoon. Asignificant amount of IN produced in the morning high NO regime could beoxidized in the low NO regime, and a possible reaction scheme was proposed

atmospheric chemistry and physics

Observation of isoprene hydroxynitrates in the southeastern United States and implications for the fate of NO&amp;lt;sub&amp;gt;&amp;lt;i&amp;gt;x&amp;lt;/i&amp;gt;&amp;lt;/sub&amp;gt;