Mareile Wolff, Wilfried Ruhe, Jan Hoops, Heiko Lilienthal, Andreas Herber, Otto Schrems
AWI Bremerhaven
In order to measure simultaneously vertical profiles of ozone and further trace gases (e.g. NO2), which are relevant in stratospheric ozone chemistry, we have developed a new balloon-borne optical sonde. Its measuring principle is based on the detection of sunlight intensity with a miniature spectrometer over a wide wavelength range (200-850 nm) during the ascent. Four new sondes were successfully launched during a first measurement campaign in June 2004 at the German Polar Research Station Koldewey, Ny-Åesund, Svalbard.
14.01.2005, 13.00 c.t.
Room S3120
A control unit in the sonde evaluates and preprocesses the data already on-board. Every ten seconds parts of the measured spectrum, meteorological values, and GPS information are transmitted to the ground. Height-dependent column densities of the considered trace gases can be determined using radiative transfer calculations . The inversion of the column densities gives the concentration profile.
The implementation of new light-weight components and innovative techniques results in an payload weight of 2 kg, thus reaching up to 40 km altitude with comparable small balloons. It can be operated by a two-men team and is suitable for field-work with limited logistic possibilities.
In the talk the measurement concept and the techniques will be presented. Results from laboratory measurements and from the Arctic campaign will be shown.