L Tallis, K Shine, T Gardiner, M Coleman
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Transcript of L Tallis, K Shine, T Gardiner, M Coleman
L Tallis, K Shine, T Gardiner, M Coleman
Analysis MethodIn a similar way to Casanova, et al. (2006)Optical depth spectrum given by
Where Fm is the measured signal by the FTIR, Fs is the extraterestrial irradiance given by Kurucz (1995), τm is the optical
depth, θ is the solar zenith angle and k(v) is an unknown calibration factor.
Rearrangement, ignoring the calibration factor
FitOptical depth is calculated for water vapour
(τw) and for five other principle absorbers in the region: CH4, CO2, O2, N2O and O3 (τg) using RFM
Linear fit of the “pseudo” optical depth to that calculated by RFM
Fit pseudo to the form of a x τw + τg + b
Fit
Retrieved “a” parameter
Retrieved “a” parameter
Average a1.033
2Average a 3000 cm-1 – 8000 cm-1
0.9823
Average a 8000 cm-1 – 9500 cm-1
1.1614
Average a 10000 cm-1 - 11500 cm-1
0.9560
InSb / CaF2 Setup
HITRAN 2004
HITRAN 2008
Average a1.037
5Average a 3000 cm-1 – 8000 cm-1
0.9783
Average a 8000 cm-1 – 9500 cm-1
1.1579
Average a 10000 cm-1 - 11500 cm-1
0.9762
HITRAN 2008 / HITRAN 2004
Average a1.005
5Average a 3000 cm-1 – 8000 cm-1
0.9961
Average a 8000 cm-1 – 9500 cm-1
0.9971
Average a 10000 cm-1 - 11500 cm-1
1.0233
Retrieved “a” parameterHITRAN 2004 HITRAN 2008
Average a Value Between
DateTime (U.T.)
Solar Zenith Angle
700cm-1 and 1400cm-1
800cm-1 and 1000cm-1
1100cm-1 and 1250cm-1
700cm-1 and 1400cm-1
800cm-1 and 1000cm-1
1100cm-1 and 1250cm-1
19 Aug 2008 1311 39 0.88 0.88
22 Aug 2008 1005 48 0.82 0.82
1200 38 0.70 0.70
1230 38 0.69 0.71 0.71 0.69 0.70 0.70
1409 44 0.66 0.66
1418 45 0.82 0.86 0.83 0.82 0.86 0.83
18 Sep 2008 080407 71 0.76 0.82 0.69 0.75 0.81 0.69
111459 50 0.81 0.86 0.81 0.81 0.85 0.81
MCT / KBr Setup