Central California Ozone Study (CCOS) - Desert Research Institute
Central California Ozone Study (CCOS) - Desert Research Institute
Central California Ozone Study (CCOS) - Desert Research Institute
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<strong>CCOS</strong> Field Operations Plan Version 2: 5/31/00<br />
Surface Meteorology<br />
Wind Speed - Anemometer Drive. An R.M.Young Model 18801 anemometer drive is<br />
certified quarterly. A photo tachometer is used to determine the actual rotational speed of the<br />
anemometer drive shaft for comparison with the rotational speed indicated by the anemometer<br />
drive display. Readings are made at six speeds evenly spaced through the entire operating range<br />
of the instrument. Additionally, the frequency output from the drive is verified against a digital<br />
frequency counter. Torque Disk (no certification required).<br />
Wind Direction - Compass (no certification required). Torque Disk (no certification<br />
required).<br />
Ambient Temperature - Mercury-in-glass thermometer. Audit mercury-in-glass<br />
thermometers are compared to an NIST-traceable standard thermometer when they are<br />
purchased. The two thermometers were immersed in water baths of approximately zero, 10°,<br />
20°, 30° and 40°C. Periodic comparisons with the standard thermometer are not required if the<br />
operating ranges of the thermometers are not exceeded.<br />
Relative Humidity and Dew-point Temperature – Psychrometer mercury-in-glass<br />
thermometers. The psychrometer mercury-in-glass thermometers are compared to an NISTtraceable<br />
standard thermometer when purchased. The two psychrometer thermometers and the<br />
standard thermometer were immersed in water baths of approximately zero, 10°, 20°, 30° and<br />
40°C. Periodic comparisons with the standard thermometer are not required if the operating<br />
ranges of the thermometers are not exceeded.<br />
Pressure - Audit barometer (Peet Brothers Ultimeter Model 3). The audit barometer is<br />
compared with a standard barometer on a yearly basis.<br />
Total Solar Radiation – Pyranometer. Audit pyranometers are checked annually by<br />
comparing the pyranometers output with an independent pyranometer maintained by AVES’s<br />
QA group. The voltmeter is used to read the audit pyranometer outputs is certified on an annual<br />
basis.<br />
Rawinsondes. Audit barometer (Peet Brothers Ultimeter Model 3). The audit barometer is<br />
compared on a regular basis with a standard barometer maintained by AVES. The psychrometer<br />
mercury-in-glass thermometers are compared to an NIST-traceable standard thermometer when<br />
purchased. The two psychrometer thermometers and the standard thermometer were immersed<br />
in water baths of approximately zero, 10°, 20°, 30° and 40°C. Periodic comparisons with the<br />
standard thermometer are not required if the operating ranges of the thermometers are not<br />
exceeded.<br />
Flow Measurements.<br />
QA Standards - All flow meters used for the field audits will be compared against flow<br />
standards maintained by AVES/ATC Associaates at its QA laboratory in Monrovia, <strong>California</strong>,<br />
or against similar flow standards. These standards are used to certify the flow transfer standards<br />
that are used in the field. AVES’s QA flow standards are summarized below:<br />
Chapter 4: QUALITY ASSURANCE 4-7
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