CASES99 October 1999
 
1.- Authors or source of the data:

University of Barcelona (Spain)
Authors: Maria Rosa Soler, Carmelo Infante and Pablo Buenestado.
 
2.- Description of the sensors used in the data collection.

The sub-gully study consists in a 10 m tower instrumented with:
Three levels, 1.06, 3.07 and 9 m of slow response measurements of temperature, wind speed and direction, and humidity. Two sonic anemometers were implemented at 1.75 and 7.4 m respectively.  The measurements also include net radiation at 1.06 m, ground heat flux at 8 cm, four soil temperature sensors at 1.5, 6, 14, 28, and two moisture sensors at 14 and 28 cm, respectively.
Sonic anemometers:

2.1.- Campbell CSAT3, and Solent 1012-R2. Sample frequency 20 Hz,     

Threshold : 30 mm/s for u ,v and 4mm/s for w

Accuracy:                       < 30 m/s +-3%; >30 m/s +-5%;

2.2.- Wind speed and direction  measured with propeller anemometers (RM young 05103).
 Sample frequency 5 Hz

 Wind Vanes, Threshold:  1.0 m/s at 10º displacement,  1.5 m/s at 5º;  Accuracy  +- 3º

Cup anemometers, Threshold :   0.5 m/s ;    Accuracy    +- 0.2 m/s

2.3.- Temperature and humidity were measured with a precision thermisthor and a Vaisala capacitive relative humidity sensors (Campbell HMP35AC). 

Sample frequency 1Hz

Absolute Temperature, Accuracy :  +- 0.01 ºC   from(-23 to 48)ºC

Humidity Accuracy : +-1% RH 0-90%, 3% 90-100%

2.4.- Net radiation were measured with a (Campbell 107) net radiometer                                         

Sample frequency  1 Hz

Accuracy: +- 5%  to +- 10 %

2.5.- Soil Temperature were measured with (Campbell 107 ) temperature probe

Sample frequency 1 Hz
Accuracy:      +- 0.1 ºC from (-23 to 48)ºC

2.6.- Soil heat flux were measured with a soil water content reflectometer (Campbell CS615)

Sample frequency: 1 Hz
Accuracy:  +- 1% to +- 5%

2.7.- Ground heat flux were measured with a (Campbell RECS HFT-3) heat flux plate.

Sample frequency 1 Hz
The resolution is  10-6 m3/m3 and accuracy  2%

These instruments were calibrated prior to the campaign at the Campbell headquarters in England.

3.- Low frequency measurements were averaged every five minutes. The variable list is:

Year, month, day, hour, minutes and seconds
Hour (If hour is 1205 the mean value is from 1200 to 1205)
If the data do not exists or is incorrect it appears in the appropriate place + 6999 or -6999, it depends of the sensor.
TA1  (Air temperature at 1.06 meters)    (Celsius)
 TA3  (                             3.07  meters)
 TA9  (                             9 meters)
 HR1  (Relative Humidity at 1.06 meters)  (%)
 HR3  (                                  3.07 meters)
 HR9  (                                  9 meters)
 Ts2  (Soil temperature at 1.5 cm)    (Celsius)
 Ts6  (                               6 meters)  
 Ts14 (                              14 meters)
 Ts28 (                              28 meters)
 Flux (Termofluximeter at 8 cm)       (W/m2)
 Hs14 (Soil water content soil 14 cm) (m3 water/m3 soil)
 Hs28 (                        28 cm)
 Rn1  (Net radiation at 1.06m)           (W/m2)
 V1   (Mean velocity value= Sum(Mi)/n)              (m/s)
 Mag1 (Wind's magnitude)
 Fase1 (Angle (North direction=0))
 Dsdv1 (Standard deviation)
 V3    (The same at 3.07 meters....)
 Mag3 
 Fase3
 Dsdv3
 V9    (The same at 9 meters....)
 Mag9 
 Fase9
 Dsdv9

 File                                         Dates                

tower5min.dat                 14-10 99 at 1420 to 29 -10-99 at 1040.




4.- High frequency measurements are averaged every 10 seconds


The variable list is

Year, month, day, hour, minutes, seconds 
u 7.4 (South -North wind component at 7.4m)  (m/s)
v 7.4( West-East wind component ar 7.4m) (m/s)
w 7.4 (Vertical wind component at 7.4 m) (m/s)
t 7.4 (Temperature at 7.4 m) ( Celsius)
u 1.75 (The same as 7.4 m)
v 1.75
w 1.75
t 1.75

The file names are

File                               Time (ddmmhhmmss)           Dates

13170010sec.dat                  13170000-14081950            13-14 Oct.
14170010sec.dat                  14170000-15093450	      14-15 Oct.
15170010sec.dat                  15170000-16093450            15-16 Oct.
16170010sec.dat                  16170000-17093450            16-17 Oct.
17170010sec.dat                  17170000-18093450            17-18 Oct.
18170010sec.dat                  18170000-19093450            18-19 Oct.
19170010sec.dat                  19170000-20093450            19-20 Oct.
20170010sec.dat                  20170000-21074950            20-21 Oct.
21170010sec.dat                  21170000-22055450            21-22 Oct.
22170010sec.dat                  22170000-23093450            22-23 Oct.
23170010sec.dat                  23170000-24093450            23-24 Oct.
24170010sec.dat                  24170000-25074600            24-25 Oct.
25170010sec.dat                  25170000-26074950            25-26 Oct.
26170010sec.dat                  26170000-27074950            26-27 Oct                             

5.- A description of the quality control done on the data.

The data were despiked using a procedure described in Vickers and Mahrt (1997).
In order to remove small-scale variance and noise, the time series of sonic anemometers has been filtered using a wavelet technique, db4, (Daubechies, 1992).
Finally the till correction method was applied (Kaimal et al., 1994)
If the data do not exists or is incorrect it appears in the appropiate place + 6999 or -6999, it depends of the sensor