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  • The TROLAS group has participated in several measurement campaigns within the framework of different national and international projects (FIELDVOC, PRICE, PRICE II, BROK, ALBATROSS, AEROSOLS99, INDOEX, DOMINO). These campaigns have provided ground based in situ measurements of peroxy radicals in different environments: urban, rural and in the marine boundary layer. Based on the gained experience, the initial PeRCA instrument and the corresponding calibration system have been gradually optimized for in situ measurements in different platforms.

  • Furthermore, TROLAS has lately been involved in the airborne measurement of peroxy radicals in the free tropopshere. In that context and in cooperation with the Institute of Atmospheric Physics of the German Aerospace Center, DLR, a modified PeRCA instrument for the measurement of the total sum of peroxy radicals in airborne platforms was successfully implemented aboard the DLR Falcon research aircraft in 2002. Since then, the airborne DUALER (DUal channel Airborne peroxy radicaL chemical amplifiER) has been gradually developed and characterized in the laboratory, and will shortly be implemented in the CASA-212-200 aircraft for the measurement of peroxy radicals in the boundary layer and up to 3 km.

  • Meanwhile TROLAS has finalised a new airborne instrument which has been successfully deployed in the HALO research aircraft: the PeRCEAS (Peroxy Radical Chemical Enhancement and Absorption Spectrometer)