Central California Ozone Study (CCOS) - Desert Research Institute

CCOS Field Operations Plan Version 2: 5/31/00
Measurement
Variable
Audit Criteria
Procedure
Reference
General Procedure
extremes of the operating ranges where errors most frequently occur. The
latter method will depend on the site sensor being amenable to the salt
solution method.
Remote Sensing
Horizontal Wind
Speed and Direction
Antenna alignment to true --
±2°
Antenna level and/or zenith --
±0.5°
Sodar transponder response -
- ±0.2 m/s for component
Comparison systematic
difference – Beam
component, ±1.0 m/s,
Resultant, ±1.0 m/s, ±10°,
when wind speeds are greater
than 2 m/s.
Comparison RMS difference
– Beam component, ±2.0 m/s,
Resultant, ±2.0 m/s, ±30°,
when wind speeds are greater
than 2 m/s.
EPA-454/R-99-005-013
with 3/15/99 updates
Anticipated comparison instruments to be used may include a rawinsonde or
anemometer kite. If an adjacent tall tower is available it will also be used.
For any of the comparison methods, data will be collected over a 24-hour
period to encompass a variety of meteorological conditions.
For sodars that are amenable to a transponder audit, that may be used in place
of the comparison.
RASS
Temperature
Virtual
RASS element level -- ±1°
Comparison systematic
difference – ±1.0°C
Comparison RMS difference
– ±1.5°C
EPA-454/R-99-005-013
with 3/15/99 updates
Anticipated comparison instruments to be used may include a rawinsonde or
other temperature sounding device. Data will be collected over at least a 24-
hour period to encompass a variety of meteorological conditions.
Chapter 4: QUALITY ASSURANCE 4-25