Validation of the forward/inverse physical scheme ϕ-IASI · ITSC-15, Maratea, Italy, 3-10 October...

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ITSC-15, Maratea, Italy, 3-10 October 2006 Validation of the forward/inverse physical scheme ϕ-IASI with NAST-I and IMG data. A. Carissimo G. Grieco G. Masiello C. Serio C. Serio U. Amato I. DeFeis DIFA: Department of Environmental Engineering and Physics. University of Basilicata. Potenza, Italy. IAC: Institute of Applied Mathematics. CNR, Napoli, Italy V. Cuomo M. Viggiano IMAA: Institute of Methodology for Environmental Analysis. CNR. Tito Scalo, Potenza, Italy.

Transcript of Validation of the forward/inverse physical scheme ϕ-IASI · ITSC-15, Maratea, Italy, 3-10 October...

Page 1: Validation of the forward/inverse physical scheme ϕ-IASI · ITSC-15, Maratea, Italy, 3-10 October 2006 Validation of the forward/inverse physical scheme ϕ-IASI with NAST-I and IMG

ITSC-15, Maratea, Italy, 3-10 October 2006

Validation of the forward/inverse physical scheme ϕ-IASI with NAST-I and IMG data.

A. CarissimoG. GriecoG. MasielloC. SerioC. Serio

U. AmatoI. DeFeis

DIFA: Department of Environmental Engineering and Physics. University of Basilicata. Potenza, Italy.

IAC: Institute of Applied Mathematics.CNR, Napoli, Italy

V. CuomoM. Viggiano

IMAA: Institute of Methodology for Environmental Analysis. CNR.Tito Scalo, Potenza, Italy.

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Forward/Inverse ToolsThe φ-IASI package

σ-IASI: forward model δ-IASI: physical inverse scheme ν2-IASI: neural network inversion scheme ε-IASI: EOF based regression scheme

γδσ-IASI: Cloud Detection SchemeMasiello et al. JQSRT, Vol 77/2, 131-148, 2003Masiello, et al. Appl. Opt. 43, 2004

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REFERENCE FRAME

IASI project: Infrared Atmospheric Sounding Interferometer

Fourier Transform spectrometer with a sampling rate of 0.25 cm-1

spectral coverage: 640 to 2760 cm-1

METOP/1, launch 7 October 2006 (?) (ESA/EUMETSAT EPS programme).

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IMG: Interferometric Monitoring of Greenhouse Gases (0.05 cm-1 sampling rate), ADEOS/1 platform

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NAST-I observations from the CAMEX/3 and EAQUATE experiments

NAST-I (NPOESS Airborne Sounder Testbed, infrared interferometer)Spectral sampling of ≈ 0.24 cm-1Spectral coverage witch matches that of IASI (645 to 2760 cm-1).

CAMEX 3 (Convection and Moisture Experiment 3)Data acquired during the Atlantic basin tropical cyclone field validation NASA ER-2 flight (during local nighttime, September 13-14, 1998) over Andros Island, Bahamas.

EAQUATE (European AQUA Thermodynamic Experiment)

Data acquired during the Italian field validation Proteus flight(3-11 September, 2004)

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σ-IASI Consistency Check based on

NAST-I scan #298 (Nadir)

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Eaquate CampaignNAST-I spectrum recorded over a plant canopy

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AFTER: Mark Shephard, Tony Clough, Jennifer Delamere, Karen Cady-Pereira, and Eli Mlawer,Atmospheric and Environmental Research (AER), Inc., http://bernath.uwaterloo.ca/ASSFTS/Media/ASSFTS%20Presentations/pdfPres/Shephard.pdf

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The inverse scheme

21 ))(())((:Subject to

Min! )()(

αχ≤−−

−−

− vRSvR

vvLvv

FF t

gt

g

1−= BL[ ])()())(())(()( 11

gt

gt FFQ vvBvvvRSvRv −−+−−= −− γ

)()(ˆˆ 11 QQ vvvnn ∇∇∇−= −

+ vv

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Rodgers-like Approach

111112111v

00

011111

0

))(()(

)()(ˆ

−−−−−−−−

−−−−−

+++=

−=−+=−

KSKBKSKBKSKBS

vvqqBdSKKSKBvv

ttt

g

tt

γγγ

γγ

Tikhonov-like Approach

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⎪⎪⎩

⎪⎪⎨

++

++

+=

like-Rodgers );()()(ˆ

:form wise-Component

222

2

icicic(i)c bii

itrue

i

i

αγγ

αγα

αγα

ε

Transform the inverse solution to PC space trough SVD of the resolving kernel:

(details in:Carissimo et al, 2005, EMS, Vol. 20, 1111-1126

and EUMETSAT Tech. Rep. EUM/CO/04/1285/RST, Final report, 2004)

)(],,[;21

21

GVUKBSG svd=Α=−

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10-4 10-3 10-2 10-1 100 101

0

100

200

300

400

500

600

700

800

900

1000

Pre

ssur

e [m

bar]

γ=0.7

d.o.f.=7.5

10-4 10-3 10-2 10-1 100 101

0

100

200

300

400

500

600

700

800

900

1000

γ=1.0

d.o.f.=7.2

10-4 10-3 10-2 10-1 100 101

0

100

200

300

400

500

600

700

800

900

1000

water vapour [g/kg]

γ=2.0

d.o.f.=6.5

10-4 10-3 10-2 10-1 100 101

0

100

200

300

400

500

600

700

800

900

1000

γ=70

d.o.f.=5.0

F.G.RAOB BrindisiPhysical Inversion

EAQUATE EXPERIMENT

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0 2 4 6 8 10 12 14 16 18 20

0

100

200

300

400

500

600

700

800

900

1000

H2O mixing ratio (g/kg)

Pre

ssur

e (m

bar)

Brindisi RAOBRetrieved

Physical retrieval, H2O(Initialization by EOF Regression)

EAQUATE experiment42 NAST-I spectra have been inverted

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200 210 220 230 240 250 260 270 280 290 300

0

100

200

300

400

500

600

700

800

900

1000

Temperature (K)

Pre

ssur

e (m

bar)

Brindisi RAOBRetrieved

Physical retrieval, Temperature(Initialization by EOF Regression)

EAQUATE experiment

42 NAST-I spectra have been inverted

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Retrieval Exercise based on NAST-I scan #298 spectrum

FG: from EOF Regression; Truth: RAOB2

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Retrieval Exercise based on NAST-I scan #298 spectrum

FG: from EOF Regression; Truth: RAOB2

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Physical retrieval, Temperature(Initialization by EOF Regression)

CAMEX/3

294 NAST-I spectra have been inverted

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Physical retrieval, H2O(Initialization by EOF Regression)

CAMEX/3

294 NAST-I spectra have been inverted

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Ozone Retrieval from IMG tropical soundings(details in: Grieco et al JQSRT, Volume 95, Issue 3 (2005) 331-348)

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Main Conclusionsϕ-IASI does work The quality of state-of-art radiative transfer seems to be good enough to meet Temperature and H2O IASI mission objective.

In particular no radiosonde tuning was needed to yield accurate retrievalSome problems do exist and are mostly confined to the short wave side of the spectrum (forward modeling?, spectroscopy?, N2O climatology?)

The Physical inverse scheme improves T and H2O retrieval independently of the initialization scheme.