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We have analyzed mid-infrared limb-emission measurements of polar stratospheric clouds (PSCs)by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) during theAntarctic winter 2003 with respect to PSC composition. Coincident Lidar observations from McMurdowere used for comparison with PSC types 1a, 1b and 2.Application of new refractive index data of β-NAT have allowed to accuratelysimulate the prominent spectral bandat 820 cm-1 observed by MIPAS at the location where the Lidar instrumentobserved type 1a PSCs. Broadbandspectral fits covering the range from 780 to 960 cm-1 and from 1220 to 1490 cm-1showed best agreement with the MIPAS measurements when spectroscopic data of NAT wereused to simulate the MIPAS spectra.MIPASmeasurements collocated with Lidar observations of Type 1b and Type 2 PSCs could only bereproduced by assuming a composition of supercooled ternary H2SO4/HNO3/H2Osolution (STS) and of ice, respectively. Particle radius and number density profilesderived from MIPAS were generally consistent with the Lidar observations. Only in the caseof ice clouds, PSC volumes are partly underestimated by MIPAS due to large cloud optical thickness in thelimb-direction.A comparison of MIPAS cloud composition and Lidar PSC-type determination basedon all available MIPAS-Lidar coincident measurements revealed good agreement between PSC-types1a, 1b and 2, and NAT, STS and ice, respectively.We could not find spectroscopic evidence for the presence of nitric acid dihydrate (NAD)from MIPAS observations of PSCs over Antarctica in 2003

Spectroscopic evidence for NAT, STS, and ice in MIPAS infrared limb emission measurements of polar stratospheric clouds