Pictures from real MIPAS spectrum obtained from ESA (24 Mar,
approx 19km tangent height) - [PDF File] -
apart from the `standard' gases, it's possible to identify
emissions from CFC-11, CFC-12, NO and CO.
IDL programs to apodise ESA L1B spectra and extract microwindows
and instrument line shape.
Large negative
`aliasing spikes' evident on ESA-supplied simulated data
(one per band): 724.438, 1056.472, 1383.018, 1774.873, 2074.527 cm-1
(Microwindow selection excludes all points within 1cm-1 either side
of these frequencies)
Output is ordered by microwindow within each sweep, then next sweep,
with one file for a complete elevation scan.
Suggest adding local solar time (LST) and
solar zenith angle (SZA) to output.
These are not present in the L1B data
so will need to be calculated.
Examining behaviour of the ULe Cloud Index for partly clouded FOV
ULe threshold CI=1.8 appears to reject cases where >25% FOV is
filled with thick cloud, although some altitude dependence.
Currently attempting to fit cloud opacity v. cloud index in order to
determine cloud opacity, but might need to include some
altitude knowledge before useful accuracy is obtained.
