Tethersonde mean meteorology from the high-Arctic ASCOS expedition 2008
Ian Brooks
In-situ boundary-layer meteorological observations were made from the ice using sensors hanging under a tethered balloon which was quasi-continuously winched up and down in the ~0 – 600 m layer. The sensor package consisted of a sonic anemometer in an aerodynamic housing and sensors for mean temperature and relative humidity, as well as sensor package movement and orientation. An aerosol sensor was also included and a camera set to take low-rate time lapse photos hang under the tethered balloon. The data include one set of mean profiles and one set of turbulent kinetic energy-dissipation rate; a measure of turbulence derived from the inertial sub-range of wind speed power spectra.
AtmosphereWeather observationsASCOSMeteorologyHigh ArcticArctic boundary layerArctic cloudsTethered sonde profiles
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Citation
References
Tjernström, M. et al. 2014. The Arctic Summer Cloud Ocean Study (ASCOS): overview and experimental design. Atmospheric Chemistry and Physics, 14, 2823–2869. https://doi.org/10.5194/acp-14-2823-2014
Data description
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.
TS10 =
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
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.
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.
No wind direction is available as yet.
Ian Brooks<br /> i.brooks@see.leeds.ac.uk
Comments
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.Original address: http://www.ascos.se/index.php?q=node/254
Files:
all_TS10.zip (3.68 MB)
Project
Arctic Summer Cloud-Ocean Study 2008 (Ascos)
Publisher
Bolin Centre Database
First name
Michael
Last name or organisation
Tjernström
Email address
Address
Department of Meteorology; Stockholm University
Postal code
SE-106 91
City
Stockholm
Country
Sweden
GCMD science keyword
Earth science > Atmosphere
GCMD location
Ocean > Arctic Ocean
Dataset language
English
Begin date
2008-08-13
End date
2008-09-01