Looking at retrieving CO2, pressure and temperature simultaneously
viewing a 300km `box' of atmosphere, MIPAS A band.
- At 100mb, CO2 shows large correlation with pressure, as expected,
but retrieval precision ~ 1%.
- At 1mb, CO2 retrieval precision much worse
but correlation with pressure actually smaller.
- Taking ratio of Jacobians corresponding to 1% pressure and 1% CO2
perturbations, the result generally oscillates between 1 and 2.
1 indicates radiance proportional to number of CO2 molecules;
2 indicates extra pressure proportionality,
consistent with major contribution from
Lorentzian line wings (even in the 1mb case).
- 1mb result is surprising and suggests there is information in
MIPAS spectra to discriminate between CO2 and pressure even at high altitudes
CO Retrieval (OO)
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CO has a lifetime of the order of months.
Sources either biomass burning (troposphere) or downward advection
from the mesosphere
Analysing CO retrieval from 300 km `box' of atmosphere at 100mb,
MIPAS D band
- Ignoring non-LTE, retrieval precision of the order of 10%.
Occupation Matrices (AD)
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Request from ESA to expand altitude ranges associated with sweeps
in OMs to cope with MIPAS pointing variability (previous values
of 1.5km not wide enough).
All `jan01' delivered OMs now converted and redelivered.
