Field observations on board HALO
The research aircraft HALO (High Altitude and Long Range Research Aircraft) provides an excellent combination of high flight altitude and long range for investigations of climate processes in the UTLS. IEK-7 substantially contributed to HALO missions such as TACTS (Transport and Composition in the UT/LMS), ACRIDICON-CHUVA (Tropical Deep Convective Clouds and Precipitation over Amazonia), ML-Cirrus (Formation, Lifetime, Properties and Radiative Impact of Mid–Latitude Cirrus Clouds), POLSTRACC (Polar Stratosphere in a Changing Climate), GW-LCYCLE (Gravity Wave Life-Cycle), ESA´s GWEX (gravity wave experiment, coordinated by IEK-7), and SALSA (Seasonality of Air mass transport and origin in the Lowermost Stratosphere using the HALO Aircraft).