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Observations of NO, NO2, total peroxy nitrates (ΣPNs), totalalkyl nitrates (ΣANs), HNO3, CO, O3, and meteorologicalparameters were obtained from October 2000 through February 2002 at1315 m a.s.l., 38.9° N, 120.6° W on Sierra Pacific Industries land,adjacent to the University of California Blodgett Forest Research Station(UC-BFRS). We describe the data set with emphasis on the diurnal cyclesduring summertime 2001. We show that transport of the Sacramento urban plumeis a primary factor responsible for diurnal variation in total reactivenitrogen mixing ratios as well as in NOx, ΣPNs and ΣANs, all of which exhibit a late afternoon/early evening peak. In contrast,HNO3 has a peak just after local noon indicating that HNO3 is innear steady state during the day with production due to photochemistry andremoval by deposition and mixing with the background free troposphere.Boundary layer dynamics influence mixing ratios of all species in the earlymorning. Analysis of the morning feature suggests that higher mixing ratiosof NOx and HNO3 persist in the residual layer than in thenocturnal boundary layer indicating the presence of nocturnal sinks of bothspecies. Nighttime observations also indicate large HNO3 and ΣANs production through oxidation of alkenes by NO3

atmospheric chemistry and physics

Observations of NO&amp;lt;sub&amp;gt;x&amp;lt;/sub&amp;gt;, ΣPNs, ΣANs, and HNO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; at a Rural Site in the California Sierra Nevada Mountains: summertime diurnal cycles