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10. Daily Checks

Check if current time is displayed on CR23X. This means that data logger has power and

that it is taking data.

After transfer of data to laptop, do the following:

- Open data file with spreadsheet program. Check that there is no data missing between

data transfer from previous day and current data transfer. If there is data missing,

retrieve data once more from CR23X. If data is still missing, record missing time

period in field logbook.

- If no data has been recorded, first check connection to power. If power is connected

and if the current time is displayed on the CR23X, but still no data, notify Markus

Pahlow (410-516-4483; [email protected]) or Jan Kleissl (410-516-5031;

[email protected]). Make a note in the field logbook.

The data will be checked for completeness at Hopkins (either Markus Pahlow or Jan

Kleissl will do this every day) using computer programs especially written for this

purpose.

No calibration is necessary for the CSAT3. It only needs to be recalibrated if any of the

transducers of the 3-D sonic have been bent. If that is the case, the instrument has to be

shipped to Campbell Sci., Logan, Utah. Replace instrument with spare JHU 3-D sonic

anemometer, which is stored at Johns Hopkins Univ. Call Markus Pahlow or Jan Kleissl.

11. Maintenance

The CSAT3 is unable to measure wind when water droplets are present on the face of the

transducers. The CSAT3 will be ready to measure wind as soon as the water droplets

evaporate or are removed by the station operator. Remove the water droplets by dabbing

a cotton swab or tissue on the face of the transducer.

12. Safety issues

None.

References:

Albertson JD, Parlange MB, Kiely G, Eichinger WE, 1997: The average dissipation rate

of turbulent kinetic energy in the neutral and unstable atmospheric surface layer, J.

Geophys. Res., 102, 13423-13432.

Porte-Agel F, Parlange MB, Meneveau C, Eichinger WE, Pahlow M, 2000: Su/jointfilesconvert/334434/bgrid-scale

dissipation in the atmospheric surface layer: Effects of stability and filter dimension, J.

Hydromet., 1, 75-87.

Pahlow M, Parlange MB, Porte-Agel F, 2001: On Monin-Obukhov Similarity in the

Stable Atmospheric Boundary Layer, Bound. Layer Meteor., in press.

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Campbell CSAT3 Manual de usuario Pagina 7