Surface ozone in the Lake Tahoe Basin

Diurnal cycle of ozone throughout the troposphere over Frankfurt as measured by MOZAIC-IAGOS commercial aircraft

“…In principle, Lidar measurements over a sufficiently long period may be used to investigate the diurnal cycle of O 3 at multiple levels in the troposphere (although with more uncertainties than considering in-situ observations) but to our knowledge, no such studies exist (probably because such Lidar observations are complex to operate routinely during long periods). The changes of diurnal variability with altitude have been investigated during some campaigns with several instruments deployed at different altitudes along a mountain slope, showing a decrease of the O 3 diurnal variability with altitude, and a slight reverse at the highest elevations with greater mixing ratios during night (Ezcurra et al, 2013;Burley et al, 2015;Brodin et al, 2010). However, the previously mentioned strong influence of the local dynamics in such environments prevents extrapolation of these results to the FT.…”

Passive monitoring techniques for evaluating atmospheric ozone and nitrogen exposure and deposition to California ecosystems

“…This is why throughfall monitoring continues to be used in many studies, including large networks such as long-term regional, countrywide or continental-scale monitoring programs (Bleeker et al 2003, Clarke et al 2010, Fenn et al 2008, Ferretti et al 2014, Hansen et al 2013. The key limitation of passive samplers is that the time-averaged data obtained do not describe diurnal patterns of pollutant exposure, which can be important when considering stomatal uptake and biological effects of pollutants (Krupa locations (Burley et al 2015).…”

“…Data on atmospheric concentrations of gaseous pollutants can be used to evaluate temporal trends in pollutant concentrations and to assess the potential for biological effects (Bytnerowicz et al 2008, Cape et al 2009. Concentration data for nitrogenous pollutants can also be used to calculate dry deposition fluxes to the ecosystem, an approach commonly known as the inferential method, which is summarized in section 4.3 (Bytnerowicz et al 2015). Passive samplers used to monitor HNO have 3 also been used for stable nitrogen (N) isotope analysis of the collected HNO (Bell 3 et al 2014, Elliott et al 2009.…”

Air Quality at Devils Postpile National Monument, Sierra Nevada Mountains, California, USA

“…Ambient concentrations of NH 3 (~2 to 3 µg m -3 ), NO (~3 to 4 ppb), NO 2 (~1 to 2 ppb), HNO 3 (~1 µg m -3 ), and SO 2 (< 0.4 µg m -3 ) were generally low and within ranges typical for remote locations of the Sierra Nevada Mountains (Table 3; Bytnerowicz and Fenn, 1996;Bytnerowicz et al, 2000Bytnerowicz et al, , 2015. Concentrations of NH 3 , HNO 3 and SO 2 were similar to those determined in 1999 at several remote locations of Sequoia National Park that are not directly affected by emissions from the SJV (Bytnerowicz et al, 2002).…”