HALO, a modified Gulfstream G550 (GV) twin engine business jet, is capable of carrying a payload up to altitudes of 14.5 km or potential temperatures of 420 K which is above the lowermost stratosphere (LMS) at mid-latitudes. The aircraft is therefore the ideal tool to investigate the vertical structure of temperature and trace gases in the SH UTLS as well as dynamical processes in the middle atmosphere. Large part of the required instruments was already successfully employed in previous UTLS missions in the Northern hemisphere (e.g. POLSTRACC-GWLCYCLE2-SALSA (PGS) and WISE). To investigate middle atmosphere dynamics (e.g. gravity waves), a new sophisticated upward-looking temperature lidar-system is included.

Instrument Technique Measured quantities Principal investigator
Remote sensing
ALIMA lidar line-of-sight wind (FL + 100 km), T, stratospheric aerosols Bernd Kaifler
GLORIA infrared limb sounder curtains/3D-distributions: T, H2O, HDO, O3, PAN, CH4, N2O, CFC-11/12, HCFC-12, SF6, C2H6, CH3OH, CH2O, NH3, NO2, N2O5, ClONO2, BrONO2, HO2NO2 Peter Preusse, Michael Höpfner
Mini-DOAS UV/Vis/near-IR spectrometer curtains of brominated VSLS Klaus Pfeilsticker
In situ
BAHAMAS Basic Halo Measurement and Sensor System u, v, w, p, T, humidity, aircraft position and aircraft parameter data Andreas Giez
FISH Lyman-α hygrometer total H2O Martina Krämer
GhOST-MS GC/MS SF6, CFC-12, halogenated VSLS Andreas Engel
HAGAR-V GC-ECD, GC/MS, IR-detector CO2, SF6, CH4, N2O, CFC-11, CFC-12, Halon-1211, short-lived NMHCs Michael Volk
AIMS CI-MS HCl, HNO3, ClONO2, SO2, H2Ogas Christiane Voigt
UMAQS QCL CO, N2O, CH4, C2H6, CO2 Peter Hoor
FAIRO chemilum. detector, UV-spectrometer O3 Andreas Zahn
AENEAS chemilum. detector NO, NOy Helmut Ziereis
AMICA absorption spectrometer OCS, CO, CO2 Marc von Hobe
KITsonde multi-sensor dropsonde profiles of p, T, RH, wind Andreas Wieser

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