Central California Ozone Study (CCOS) - Desert Research Institute

CCOS Field Operations Plan (DRAFT) Version 2: 5/31/00
NOy and the sum of NO, NO 2 , and PAcN. This second estimate is an upper-limit
because NOy also includes organic nitrates and particulate ammonium nitrate.
6. Continuous formaldehyde during primary study period by an instrument that
continuously measures the fluorescent, dihydrolutidine derivative formed by the
reaction of formaldehyde with 1,3-cyclohexanedione and ammonium ion (Dong and
Dasgupta, 1994; Fan and Dasgupta, 1994).
7. Semi-continuous hourly organic compound speciation data during primary study
period by gas chromatography with ion-trap mass spectrometry. VOC speciation
includes C 2 to C 12 hydrocarbons, carbonyl and halogenated compounds. Collect up to
10 sets of canister and DNPH samples for measurement comparisons with GC/MS
and continuous HCHO analyzer.
8. Four 3-hour (at 0000-0300, 0600-0900, 1300-1600, and 1700-2000, PDT) Tenax
cartridge samples for up to 15 IOP days for analysis C 8 -C 20 hydrocarbons
9. Continuous CO by TEI 48C and continuos CO 2 by TEI 41C during study period.
10. Actinic flux during study period by scanning radiometer. The radiometers will be
located at the Sunol research site. The other two radiometers will be located at the US
Department of Agriculture’s UVB Radiation Monitoring site in Davis, 30 miles east
of the Granite Bay research site (see justification below), and at White Cloud, a high
elevation site.
11. Semi-continuous particulate nitrate during primary study period by Aerosol
Dynamics Inc. (ADI) automated particle nitrate monitor. The monitor uses an
integrated collection and vaporization cell whereby particles are collected by a
humidified impaction process, and analyzed in place by flash vaporization with
quantitation of the evolved gases by chemiluminescent analyzer.
12. Continuos total light absorption by aethalometer and total light scattering by ambient
integrating nephelometer during primary study period.
13. Continuous NO 2 , HNO 3 , HCHO and H 2 O 2 on twenty IOP days by dual tunable diode
laser absorption spectrometers at the Parlier research site.
2.4.2 Complementary Measurement Programs
Because a Photochemical Assessment Monitoring Station (PAMS) network does not exist
in the Bay Area, the density of air quality measurements (e.g., NO/NOy and VOC) in the Bay
Area is lower than is needed to reliably understand and simulate the conditions that result in days
exceeding the ozone standard in the Bay Area alone. The Bay Area AQMD is sponsoring
additional measurements during CCOS to obtain the information needed to develop a Bay Area
specific plan. The supplemental Bay Area measurements are primarily designed to increase the
understanding of high ozone in the Livermore Valley, where the Bay Area’s highest ozone levels
and most frequent exceedances of the standards occur. For this purpose, four types of
Chapter 2: FIELD MEASUREMENTS 2-23