http://bolin.su.se/data/oden-ascos-2008-tethersonde-1
Ian Brooks
Tethersonde mean meteorology from the high-Arctic ASCOS expedition 2008
Bolin Centre Database
2018
Datafile
Atmosphere
Weather observations
ASCOS
Meteorology
High Arctic
Arctic boundary layer
Arctic clouds
Tethered sonde profiles
Earth science > Atmosphere
Michael Tjernström
2018-10-16T14:24:39+00:00
English
1
None
<p>Data structure contains 10-second averaged data (mean meteorology) from tethersonde on<br />
a continuous time-base. Where sonde is not flying all variables except time are padded<br />
with NaNs.</p>
<p>TS10 = </p>
<p>time: [132455x1 double] - matlab serial time<br />
P: [132455x1 double] - pressure (mb)<br />
T: [132455x1 double] - air temperature (deg C)<br />
RH: [132455x1 double] - relative humidity (%)<br />
Psurf: [132455x1 double] - surface pressure (mb)<br />
palt: [132455x1 double] - pressure altitude (m)<br />
Ts: [132455x1 double] - sonic temperature (K)<br />
WS: [132455x1 double] - mean wind speed (m/s)<br />
Traw: [132455x1 double] - uncorrected air temperature<br />
RHraw: [132455x1 double] - uncorrected relative humidity</p>
<p>Poor ventilation of T/RH sensor resulted in a wind-speed dependent bias. A correction<br />
has been applied to match mean values to those of sensors on 15m mast. Uncorrected values<br />
are also given here. </p>
<p>The sonic temperature (calculated from speed of sound measurement<br />
from sonic anemometer) has a significant bias high, by ~3 degrees. This is apparently a<br />
known issue with Gill sonic anemometers (at least older models). No attempt has been made to<br />
correct it here - while absolute values is biased, relative values within profiles should<br />
be OK.</p>
<p>No wind direction is available as yet.</p>
<p>Ian Brooks<br />
<a href="mailto:i.brooks@see.leeds.ac.uk">i.brooks@see.leeds.ac.uk</a></p>
To obtain in-situ boundary-layer observations through a deeper layer, a sensors package was deployed hanging under a tethered balloon, and was quasi-continuously winched up and down in the ~0 – 600 m layer. These measurements were only interrupted when weather conditions with dense fog persisted for long periods of time since this was detrimental for the polar-bear watch. The winch was located in “Met Alley” (see Micrometeorology) which this was one (of two) reason why this site was continuously manned.
The sensor package consisted of a Gill sonic anemometer in an aerodynamic housing and sensors for mean temperature and relative humidity, as well a sensor package movement and orientation. A CLASP aerosol sensors was also included but its inlet often froze up when the package was inside clouds. A camera set to take low-rate time lapse photos also hang under the tethered balloon.
The data provided include one set of mean profiles and one set of TKE-dissipation rate; a measure of turbulence derived from the so-called inertial sub-range of wind speed power spectra.<p>Original address: <a href="http://www.ascos.se/index.php?q=node/254">http://www.ascos.se/index.php?q=node/254</a><br>
</p>
<p>
Files:<br>
<a href="/data/ascos/files/all_TS10.zip">all_TS10.zip</a> (3.68 MB)<br>
</p>