Acar / Tsen: meteorological observations
Each long-duration balloon launched during Concordiasi has been equipped
with a meteorological payload called Tsen1 developped at LMD. Tsen makes
in-situ measurements of atmospheric pressure and temperature every 30 s during
the whole flight. During the campaign however, issues onboard the scientific
gondola have leaded to some gaps in the Tsen dataset.
The pressure is measured with an accuracy of 10Pa and a precision of 0.1Pa.
The temperature is measured via two thermistors located 5 m below the last
gondola in the flight train. The precision of temperature observations are respectively
~0:25 K during day and ~0:1 K during night.
The time and location along the balloon trajectory is provided by the Cnes
Isba gondola. This dataset has been merged on ground with the Tsen dataset
to associate a GPS time and position to the meteorological observations. During
this process, the 1-minute Isba measurements have been interpolated on
the Tsen 30-second time frame provided the Tsen observations does not take
place during a data gap longer than 15 min in the Isba dataset.
Some Isba data gaps longer than 15 min were actually observed during the
campaign. In such cases, the time of the observations is ensured by the
Tsen real-time clock, but the localizations of the observations are lost.
tsen : Thermodynamical sensor, the LMD meteorological payload