References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-9-4879-2009

Observations of NOx, ΣPNs, ΣANs, and HNO3 at a Rural Site in the California Sierra Nevada Mountains: summertime diurnal cycles

Day

D. A.

⁴ ¹ Farmer

D. K.

⁵ ¹ Goldstein

A. H.

² Wooldridge

P. J.

¹ Minejima

¹ Cohen

R. C.

³ ¹

Department of Chemistry, University of California, Berkeley, CA, USA

Department of Environmental Science, Policy and Management, University of California, Berkeley, CA, USA

Department of Earth and Planetary Science, University of California, Berkeley, CA, USA

now at: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, USA

now at: Cooperative Institute for Research in Environmental Science (CIRES), University of Colorado, Boulder, CO, USA

22 07 2009

9 14 4879 4896

2009

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/9/4879/2009/acp-9-4879-2009.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/9/4879/2009/acp-9-4879-2009.pdf

Observations of NO, NO2, total peroxy nitrates (ΣPNs), total alkyl nitrates (ΣANs), HNO3, CO, O3, and meteorological parameters were obtained from October 2000 through February 2002 at 1315 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 cycles during summertime 2001. We show that transport of the Sacramento urban plume is a primary factor responsible for diurnal variation in total reactive nitrogen 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 in near steady state during the day with production due to photochemistry and removal by deposition and mixing with the background free troposphere. Boundary layer dynamics influence mixing ratios of all species in the early morning. Analysis of the morning feature suggests that higher mixing ratios of NOx and HNO3 persist in the residual layer than in the nocturnal boundary layer indicating the presence of nocturnal sinks of both species. Nighttime observations also indicate large HNO3 and ΣANs production through oxidation of alkenes by NO3.

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