World Library  

Add to Book Shelf
Flag as Inappropriate
Email this Book

Observations of the Diurnal and Seasonal Trends in Nitrogen Oxides in the Western Sierra Nevada : Volume 6, Issue 3 (07/06/2006)

By Murphy, J. G.

Click here to view

Book Id: WPLBN0003976847
Format Type: PDF Article :
File Size: Pages 50
Reproduction Date: 2015

Title: Observations of the Diurnal and Seasonal Trends in Nitrogen Oxides in the Western Sierra Nevada : Volume 6, Issue 3 (07/06/2006)  
Author: Murphy, J. G.
Volume: Vol. 6, Issue 3
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


APA MLA Chicago

Murphy, J. G., Cleary, P. A., Wooldridge, P. J., Day, D. A., & Cohen, R. C. (2006). Observations of the Diurnal and Seasonal Trends in Nitrogen Oxides in the Western Sierra Nevada : Volume 6, Issue 3 (07/06/2006). Retrieved from

Description: Department of Chemistry, University of California, Berkeley, USA. Observations of speciated nitrogen oxides, namely NO2, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), and HNO3 by thermal dissociation laser induced fluorescence (TD-LIF), and supporting chemical and meteorological measurements at Big Hill (1860 m), a high elevation site in California's Sierra Nevada Mountains, are described. From May through October, terrain-driven winds in the region routinely bring air from Sacramento, 100 km southwest of the site, upslope over oak and pine forests to Big Hill during the day, while at night, the site often samples clean, dry air characteristic of the free troposphere. Winter differs mainly in that the meteorology does not favour the buildup of Sacramento's pollution over the Sierra Nevada range, and the urban-influenced air that is seen has been less affected by biogenic VOC emissions, resulting in longer lifetime for NO2 and a predominance of the inorganic forms of nitrogen oxides.

Summertime observations at Big Hill can be compared with those from Granite Bay, a Sacramento suburb, and from the University of California's Blodgett Forest Research Station to examine the evolution of nitrogen oxides and ozone within the urban plume. Nitrogen oxide radicals (NO and NO2), which dominate total nitrogen oxides (NOy) at Granite Bay, are rapidly converted into HNO3, ΣPNs, and ΣANs, such that these compounds contribute 29, 30, and 21% respectively to the NOy budget in the plume at Big Hill. Nevertheless, the decreasing concentrations of NO2 as the plume is advected to Big Hill lead to decreases in the production rate of HNO3 and ozone. The data also demonstrate the role that temperature plays in sequestering NO2 into peroxy nitrates, effectively decreasing the rate of ozone production. The important contribution of ΣANs to NOy in the region suggests that they should be considered with regards to export of NOy from the boundary layer. Nocturnal observations of airmasses characteristic of the free troposphere showed lower NOy concentrations, which were dominated by HNO3 with a relatively small contribution from the organic nitrates.

Observations of the diurnal and seasonal trends in nitrogen oxides in the western Sierra Nevada


Click To View

Additional Books

  • Competition Between Water Uptake and Ice... (by )
  • A Case Study of Aerosol Depletion in a B... (by )
  • Optical Properties, Morphology and Eleme... (by )
  • Chemical Climatology of the Southeastern... (by )
  • Constraints on Emissions of Carbon Monox... (by )
  • Arctic Clouds and Surface Radiation – a ... (by )
  • Quantifying Uncertainty in Projections o... (by )
  • Size-resolved Aerosol Chemistry on Whist... (by )
  • A Global Model Simulation of Present and... (by )
  • Airborne Determination of the Temporo-sp... (by )
  • Re-evaluation of the 1950–1962 Total Ozo... (by )
  • Organic Functional Groups in Aerosol Par... (by )
Scroll Left
Scroll Right


Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.