Utrecht University SHEBA Tower Data Set
 

 

The file mastarchive.dat can be downloaded by anonymous ftp: ftp eos.atmos.washington.edu, directory pub/roode (ASCII, 5.2 Mb)

 

Measurement location: (76N,166W SHEBA site)
Period : 27 April - 28 May 1998

 

VARIABLE

DESCRIPTION

UNITS

time

Julian day 1998

decimal day

hour

hhmm

hhmm

temp1

temperature at 1.1 m

[Celsius]

temp2

temperature at 2.2 m

[Celsius]

temp3

temperature at 3.2 m

[Celsius]

temp4

temperature at 5.2 m

[Celsius]

temp5

temperature at 8.9 m

[Celsius]

rh1

relative humidity at 1.1 m

[%]

rh2

relative humidity at 2.2 m

[%]

rh3

relative humidity at 3.2 m

[%]

rh4

relative humidity at 5.2 m

[%]

rh5

relative humidity at 8.9 m

[%]

ff1

wind velocity at 1.1 m

[m/s]

ff2

wind velocity at 2.2 m

[m/s]

ff3

wind velocity at 3.2 m

[m/s]

ff4

wind velocity at 5.2 m

[m/s]

ff5

wind velocity at 8.9 m

[m/s]

dd1

wind direction at 3 m

[degree, true north]

dd2

wind direction at 9 m

[degree, true north]

swin

downward shortwave radiation

[W/m^2]

swout

upward shortwave radiation

[W/m^2]

lwin

downward longwave radiation

[W/m^2]

lwout

upward longwave radiation

[W/m^2]

tice1

snow/ice temperature at 5 cm depth

[Celsius]

tice2

snow/ice temperature at 10 cm depth

[Celsius]

tice3

snow/ice temperature at 20 cm depth

[Celsius]

tice4

snow/ice temperature at 30 cm depth

[Celsius]

tice5

snow/ice temperature at 40 cm depth

[Celsius]

ALL DEFAULT VALUES: -99.9

 

Instrumentation
 

temp1:temp5

Vaisala HMP35AC (absolute accuracy 0.3 Celsius)

rh1:rh5

Vaisala HMP35AC (absolute accuracy 3%)

ff1:ff5

Capmbell Vector A100R

dd1:dd2

Campbell Vector W200P

swin,swout

Kipp CM14 (absolute accuracy 1%)

lwin,lwout

Eppley precision pyrgeometers (absolute accuracy 1%)

tice1:tice5

thermistors in sea ice at 5 different levels

Radiation and wind direction were measured every 12 seconds. Two-minute averages were stored in a data logger. Humidity and temperature were sampled once every two minutes. Describe verification/validation procedures used with this data set. Tower temperature and relative humidity have been intercalibrated at the Koninklijk Nederlands Meteorologisch Instituut (KNMI). The relative error between the five temperature sensors was found to be less then 0.1 Celsius. Tower wind velocity were calibrated in the KNMI wind tunnel. The five sensors were found to be accurate within 0.2 m/s.

 

References
 

Duynkerke, P. G., S. R. de Roode, 2000: Surface energy balance and turbulence characteristi cs observed at the SHEBA ice camp during FIRE III. Revised version submitted to the special FIREIII issue of the Journal of Geophysical Research, April 2000. Postscript version

Stephan de Roode (roode@phys.uu.nl)
Peter Duynkerke (P.G.Duynkerke@phys.uu.nl)

Institute for Marine and Atmospheric Research Utrecht (IMAU)
Princetonplein 5
P.O. Box 80005, NL-3508 TA Utrecht
The Netherlands
phone (+31/0) 030 253 3275
fax (+31/0) 030 254 3163