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UP: Umweltphysik

UP 14: Poster: Neuartige Messverfahren in der Umweltphysik

UP 14.3: Poster

Dienstag, 14. März 2006, 14:00–16:00, C

A new balloon-borne optical sensor for the measurement of ozone and other stratospheric trace gases — •Mareile Wolff, Andreas Herber, and Otto Schrems — Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven

We developed a light-weight balloon-borne sonde (PIOS: platform independent optical sensor) for the simultaneous measurement of trace gas profiles in the stratosphere. Its measuring principle is based on the detection of sunlight intensity with a miniature spectrometer. The wide spectral coverage of the miniature spectrometer (200 - 850 nm) offers the possibility for measurements of trace gases which absorb within this wavelength range, e.g. O₃, NO₂, and BrO. The new sensor can be operated anywhere in the world due to the low weight of the payload (1.7 kg) and the autonomous portable telemetry system. This and the moderate price make it a very versatile tool for satellite validation and for case studies, which require a high number of launches. The sonde does not need temperature stabilisation, although the spectrometer experiences temperature changes of approx. 15 K (inside a polystyrene box) during the ascent. Inflight corrections were applied, which compensates the effects of temperature changes. In a first demonstration of its performance ozone profiles were retrieved from the irradiance measurements with an adapted Dobson-spectrometer algorithm. The comparison of the determined ozone profiles with profiles measured by ECC sondes and LIDAR shows good agreement within 10% and 20% for altitudes between 15 km and the burst point of the balloon (≈ 37 km).