Introduction (Mission status) (Thorsten Fehr)

No platform anomalies since QWG 12. Incidence of interferometer anomalies has been improving since spring 2006. Motor currents normal which indicates slide mechanism running smoothly.

Improved performance means now planning 80% duty cycle.

Main NRT user is ECMWF. Prefer nominal mode measurements. Aim to return to nominal operations by the time NRT processing is resumed.

Start full mission reprocessing working back from RR data by last quarter of 2007.

MIPAS financed until 2010. Fuel is now main limiting factor affecting future mission plan. Fuel used to control inclination drift in order to maintain sun-satellite orientation. Can extend mission by 1-2 years by deorbiting by 25km. Inclination will then be allowed to drift through acceptable limits in the new orbit.

Mission planning status (Marta de Laurentis)

Issue of how to return to nominal mode operation. Phasing out special modes. Discontinuation of MA delayed until NRT processing commences. Suggested by Anu Dudhia to nest MA mode between nominal mode days for validation of MA retrievals.

Anomalous scan pattern uploaded. Affects 3-11th April 2007.

Data availability (Fabrizio Niro)

RR L2 data August-September 2004. List available at ftp Uranus in /MIPAS/DPAC_L1_archive_RR_mission.xls.

Instrument status (Peter Mosner)

No interferometer slide turn-around errors since September 2006.

L1 status (Fabrizio Niro)

v 4.67 now processed offline. L1B data available from DPAC. Seen in A and AB-bands that 11 orbits wrongly calibrated. Affects 18-19 April 2007.

Corrupt D-band (Anne Kleinert)

D-band corruption only when FOV is cloudy due to scattering into LOS. Effect not seen in bands A and B.

Diamond pattern artifact

Diamond pattern in an H2O MA retrieval spotted by Chiara Piccolo does not appear to be due to forward-reverse sweep differences unless for some reason retrieval is sensitive to extremely small effects.

L2 validation (Piera Raspolini)

RR nominal pT retrieval failures. Bug causing retrieval to get stuck in Levenberg-Marquardt loops now fixed.

Noticed that O3 profile values with chisq < 2.5 are lower than for those with chisq > 2.5.

L1 v 5.0 processor uses slope for frequency correction but provides coefficients to perform quadratic correction. Corrections tested on orbit 2081. pT chisq looks better with quadratic correction. Bomem and IFAC quadratic correction pT chisq in agreement. Preliminary monitoring of 2 years of RR data correction shows large spread in values for quadratic frequency correction.

Clouds (David Moore)

All orbits 12793-21660 have all CI > 1.8 between 40 and 50 km. However, PSCs visible.

Suggest CI 4-5 below 5 km to remove sweeps contaminated with Earth-view.

Reference atmospheres (David Moore)

v 4.0 IG 2 to be used in new L2 processor.

NO (Manuel López-Puertas)

Retrieve NO rotational temperature from entire band then correct for NLTE to get kinetic T.

At 40-100 km consider 15 μm band. Correct for vibrational NLTE to get kinetic T.

At 100-170 km get rotational T from 5.3 μm band. Need to correct for spin, rotational and vibrational NLTE to get kinetic T.

In thermosphere, model and retrieved values for spin, rotational and kinetic T agree.

Kinetic T derived from 15 μm band shows expected global features. Vertical resolution of 5-10 km at 120-140 km.

Global features look OK for kinetic T derived from 5.3 μm.

Compare to WACMM upper atmosphere model. Reasonable agreement.

Compare to SABER model. Temperature inversion seen in observations in lower mesosphere also seen in SABER.

NO precision 5-10 % seen above 100 km. Assume hydrostatic equilibrium above top 100 km to estimate pressure. Assumption has small effect on kinetic T but larger effect on NO VMR.

NO depends on [O] in upper atmosphere. Use model [NO] and [O] to see effect of error in [O] on retrieved [NO]. Big effect. However, [O] has little effect on kinetic T.

Modelling NO+ emission at 4.3μm which impacts CO2 retrievas during aurorae since most 4.3μm radiance due to NO+. NLTE NO+ model nearly ready. Need to decide on ion inputs (NLTE from chemical production, many ions to consider).

RR nominal compared with MIPAS-B (Gerald Wetzel/Hermann Oelhaf)

Good temporal and spatial coincidence.

Temperature agrees within 2 K at most altitudes.

Good agreement for O3 but high bias for MIPAS-E at high altitudes.

Instabilities in N2O at low altitude and high bias above around 20 km.

CH4 also shows instabilities. High bias around 25 km but low bias below 18 km.

N2O should be positively correlated with CH4 since tropospheric source gases with sinks in stratosphere. Correlation not compact at lower altitudes. Correlations good at higher altitudes where both species exhibit high bias.

May see tape recorder effect in H2O around 19 km. Variability at low altitudes may be due to spatial separation (100's km) and position of hygropause.

For H2O, L2 RR agrees better with IMK/IAA retrievals than with balloon measurements. This suggests differences may be down to location.

For HNO3 agreement looks good.

NO2 comparision needs photochemical correction. Differences within combined errors.

Comparisions with SPIRALE for 22nd June 2005. In-situ diode laser spectrometer.

Pressure agreement is good.

Oscillations in L2 CH4 at low altitudes.

Oscillations in L2 N2O at low altitudes. High bias in mid-stratosphere wrt SPIRALE.

No photochemical correction needed for NO2 comparisons (same time of day). Agreement good.

EQUAL project RR validation (Thorsten Fehr)

MIPAS shows high bias at 20-50 km wrt lidar. MIPAS tangent altitudes up to 2 km lower than engineering around O3 peak. Use ECMWF to correct. Lidar now agrees better with MIPAS. Suggested that should not use ECMWF potential temperature to correct each MIPAS level since we see ECMWF-MIPAS temperature biases in correction. Suggested to find offset using ECMWF for, say, 100 mb and then use pT pointing to obtain shift for all altitudes. MIPAS T is in any case better than ECMWF above 30 km.