MIPAS reduced spectral resolution UTLS-1 mode measurements of temperature, O 3 , HNO 3 , N 2 O, H 2 O and relative humidity over ice: retrievals and comparison to MLS

摘要: Abstract. During several periods since 2005 the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat has performed observations dedicated to region of upper troposphere/lower stratosphere (UTLS). For duration November/December global distributions temperature and trace gases from MIPAS UTLS-1 mode measurements have been retrieved using IMK/IAA (Institut fur Meteorologie und Klimaforschung/Instituto de Astrofisica Andalucia) scientific processor. In UTLS a vertical resolution 3 km temperaure, 4 H2O, 2.5 O3, 3.5 HNO3 N2O achieved. The temperature, HNO3, N2O, relative humidity over ice are intercompared with Microwave Limb Sounder (MLS/Aura) v2.2 data in pressure range 316 0.68 hPa, 215 3.16 100 1 hPa 10 respectively. general, MLS temperatures biased within ±4 K whole latitude range. Systematic, latitude-independent differences −2 −4 (MIPAS-MLS) at 121 explained by previously observed biases retrievals. Temperature up 12 above 10.0 present both respect ECMWF (European Centre Medium-Range Weather Forecasts) likely due deficiencies analysis data. stratospheric volume mixing ratios (vmr) H2O ±1 ppmv, indication oscillations between 146 26 dataset. Tropical tropospheric values measured two instruments differ ±20% ~146 68 hPa. These mainly caused biases. Ozone agree 0.5 ppmv (10 20%) 14 At pressures smaller than O3 vmr higher an average (10%). General agreement is −1.0 (−10%) 1.0 ppbv (20%). (10%) compared 46 Northern Hemisphere. Over tropics 31.6 shows low bias more (>50%). 20 40 (20 40%). Differences 21 attributed known 20% positive