dragon advanced training course in atmosphere … · iref(λ) iocc(λ) occultation calibration free...
TRANSCRIPT
![Page 1: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/1.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 1
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Occultation and limb scatteringErkki Kyrölä
Finnish Meteorological Institute
1. Instruments2. Occultation: GOMOS inversion
3. Limb scattering: OSIRIS inversion4. Summary
5. References
![Page 2: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/2.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 2
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Occultation: SAGE, MSX UVISI, GOMOS, SCIAMACHY
Limb: OSIRIS, SOLSE/LORE, SCIAMACHY, GOMOS
INSTRUMENTS
![Page 3: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/3.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 3
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Iref
occI
T(λ)= Iref(λ)Iocc(λ)
OCCULTATION
calibration free principle
![Page 4: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/4.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 4
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS: Measured Sirius reference spectrum
![Page 5: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/5.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 5
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS: Measured Sirius transmitted spectrum
![Page 6: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/6.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 6
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS: Calculated Sirius transmissions
![Page 7: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/7.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 7
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
T(λ,z) = exp(− σ j (λ,T(z(s))ρ j∫∑ (z(s))ds) Beer-Lambert law
Occultation inversion is simple because...
But ...
Occultation inversion
sσ = cross section
z(s)
ρ = number density
= temperatureT
![Page 8: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/8.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 8
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Weak scintillations: intensity maxima and minima
Density fluctuation
Strong scintillations: multiple stars
Stellar occultations: dilution & scintillations
![Page 9: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/9.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 9
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
T(λ,z,t2)
T(λ,z,t1)
different times
Stellar occultations: chromatic time delay
Different colors different refraction angles
![Page 10: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/10.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 10
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
T(z,λ) = Tref Text
We can, however, write
Transmission from refractive effects can be estimated from ray tracing calculations (dilution, chromatic effects). In addition, we need photometer measurements to estimate the random part (scintillations).
![Page 11: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/11.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 11
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS: Horizontal transmissions 5-100 km
O3 inmesosphere
O3 instratosphere
NO2 instratosphere
![Page 12: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/12.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 12
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
T(λ,z) = exp(− σ j (λ)N∑ j(z))
N j (z) = ρ j∫ (z(s))ds
Occultation inversion using Beer-Lambert: Two step
Spectral inversion
Vertical inversion
This separation is not true if cross sections depend on temperature. In these cases we can use iteration over spectral and vertical inversion or one-step inversion.
![Page 13: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/13.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 13
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
C = covariance matrixT = transmission vector (all wavelengths)N = column density vector (different constituents)
We aim to minimize
Solution by Levenberg-Marquardt algorithm
Spectral inversion
S(N) = (Tobs − Tmod (N))T C−1((Tobs − Tmod (N))
![Page 14: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/14.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 14
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Aspects of spectral inversion in UV-VIS
• Linearization• Non-linear approach
• Spectrally global• Spectral windows
• Absolute cross sections• DOAS
![Page 15: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/15.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 15
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
10-23
10-22
10-21
10-20
10-19
10-18
10-17
Cro
ss se
ctio
n (c
m 2
)
6000500040003000Wavelength (Å)
O3
NO2
O3
NO3
OClO
BrO
Cross sections
![Page 16: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/16.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 16
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Transmission components at 27 km
ozone
NO2
NO3
Rayleigh
aerosol
![Page 17: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/17.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 17
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
An example of LM iteration
red=model to be fittedblue =data
black=residual
![Page 18: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/18.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 18
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
![Page 19: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/19.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 19
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
![Page 20: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/20.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 20
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
![Page 21: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/21.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 21
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Chi2 vs iteration number
![Page 22: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/22.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 22
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS vertical inversion
K =
d11
2d21 d22
2d31 2d32 d33
⎡
⎣
⎢ ⎢ ⎢ ⎢ ⎢ ⎢
⎤
⎦
⎥ ⎥ ⎥ ⎥ ⎥ ⎥
Discretize N(z) = ρ∫ (z(s))ds
N = Kρ
where the kernel matrix is
Onion peel solution
d11d22 d21
![Page 23: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/23.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 23
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Tikhonov regularization
![Page 24: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/24.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 24
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
• Data extraction• Datation•Geolocation (ECMWF+MSIS90)• Wavelength assignment• Spectrometer samples correction• Photometer data processing• Central band background estimation• Star spectra computation• Transmission computation• Products generation
GOMOS Level 1b
![Page 25: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/25.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 25
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS level 1Raw data
Geolocation& ray tracing
Instrumentalcorrections
Photometerdata
Transmissiondata
Limbdata
ECMWFprediction/analysisMSIS90
Calibrationdatabase
![Page 26: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/26.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 26
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
GOMOS level 2
Crosssections
Spectralinversion
Local densitiesO3, NO2, NO3aerosols, AirT, H2O, O2
Verticalinversion
Line densities
Level 1transmissions
Dilution& scintillation
corrections
Level 1photometer
data
![Page 27: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/27.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 27
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
LIMB SCATTERING
![Page 28: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/28.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 28
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
OSIRIS radiances
![Page 29: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/29.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 29
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Scattered limb radiances
Total radiance= single scattering + multiple scattering
I = Isun Tsun∫ (s)(ρa (s)σ a (λ)Pa + ρR (s)σ R (λ)PR )Tdet (s)ds + Ims
s
![Page 30: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/30.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 30
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Single and multiple scattering
![Page 31: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/31.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 31
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Difficulties in limb radiative transfer
• MS time consuming• Albedo• Clouds• Aerosols• Polarization• Raman scattering
![Page 32: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/32.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 32
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Modified onion peeling method
M = Itotal
I ss
S(ρ) = RModel − RMeas[ ]T ⋅ C −1 ⋅ RModel − RMeas[ ]
Measured transferspectra:
Modelled transfer
spectra:
Robs(z,λ) = Iobs(z,λ)Iref (zref ,λ)
Rmod (z,λ) = Imodss (ρ, z,λ )
Imodref (ρref , zref ,λ)
⋅ M
tabulated
Minimize
with onion peel type inversion or with one-step inversion
![Page 33: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/33.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 33
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
An example of LM iteration at 32 km (LimbLab SS)
![Page 34: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/34.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 34
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
An example of LM iteration at 24 km (LimbLab SS)
![Page 35: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/35.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 35
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
Summary
DOAS with spectral windowsFlittner for limb scattering; 3 wavelengths
Occultation and limb scattering retrievals can be approachedwith similar methods. They are based on:
-non-linear approach-using relative quantities, not directly measured quantities-original cross sections-all wavelengths
Other methods
Difficulties : Aerosol modelling, scintillations, multiple scattering
![Page 36: DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE … · Iref(λ) Iocc(λ) OCCULTATION calibration free principle. ... Beer-Lambert law Occultation inversion is simple because ... This](https://reader034.vdocuments.us/reader034/viewer/2022042809/5f8da3481b11e47cdf1ebf38/html5/thumbnails/36.jpg)
Day 3 Lecture 3 Retrieval techniques - Erkki Kyrölä 36
DRAGON ADVANCED TRAINING COURSE IN ATMOSPHERE REMOTE SENSING
ReferencesThis presentation has followed:
Kyrölä, E., E. Sihvola, M. Tikka, Y. Kotivuori T. Tuomi, and H. Haario, Inverse Theory for Occultation Measurements 1. Spectral Inversion, J. Geophys. Res., 98, 7367-7381, 1993.
Oikarinen, L., E. Sihvola, and E. Kyrölä, Multiple scattering radiance in limb-viewing geometry, J. Geophys. Res., 104, 31261-31274, 2000.
Auvinen, H., L. Oikarinen and E. Kyrölä, Inversion algorithms for limb measurements, J. Geophys. Res., 107, D13, 2001JD000407, ACH 7-1: 7-7, 2002
Reference search (free): http://adsabs.harvard.edu/abstract_service.htmltitle words: osiris gomos sciamachy msx solse loreabstract words: retrieval limb occultation
More references from
Numerical examples: GomLab and LimbLab