Eddy Covariance System
These systems use Eddy Covariance techniques to calcu-
late water vapor, carbon dioxide, and heat flux. Below
are the sensors and their measurements.
• CSAT3 Sonic Anemometer—absolute wind and
sonic temperature fluctuations
• KH20 Hygrometer—fluctuations of atmospheric
water vapor
• CS7500 Infrared Gas Analyzer—both absolute CO
2
and water vapor
• FW05 Fine Wire Thermocouple—temperature
The CR23X measures the above sensors and computes
fluxes.
Bowen Ratio Systems
The CR23X is integral to our Bowen Ratio Systems.
These systems calculate evapotranspiration (ET) by mea-
suring air temperature, net radiation, soil heat flux, and
dew point. The Bowen Ratio Systems measure air tem-
perature at two heights with type E fine-wire thermo-
couples. To measure dew point, air samples from two
heights are forced through mixing volumes and routed
to a cooled mirror dew point hygrometer. Every two
minutes the air drawn through the cooled mirror is
switched from one height to the other. The CR23X also
is used in another Bowen Ratio System that measures
water vapor and CO
2
concentrations.
Environmental Applications
Eddy covariance
station provides
data for energy
balance studies in
the McMurdo Dry
Valleys of Antarctica.
Bowen Ratio Systems calculate evapotranspiration and CO
2
fluxes over a sorghum field near Lincoln, Nebraska.
5
Other Applications
• Water level/stage
• Avalanche control
• Snow science
• Arctic research
• Soil moisture
• Water quality
• Agriculture
• Air Quality
Meteorology
The CR23X is ideal for weather stations that require a
large number of inputs.
Typical measurements include:
The CR23X can calculate:
• standard deviations for wind direction
• vapor pressure from wet/dry bulb temperature
• saturation vapor pressure from air temperature
It can also automatically control calibration sequences
and compute conditional averages that exclude invalid
data (e.g., data recorded during power failures or cali-
bration intervals).
• wind speed
• wind direction
• precipitation
• barometric pressure
• snow depth
• solar radiation
• air and soil temperature
• relative humidity
• soil moisture
Photo courtesy of Gayle Dana, DRI
(72 Seiten)
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