Fit parameters and results Influence of wavelength range & reference spectrum First results

Bremen Limb Workshop [email protected] Satellite group http://giger.uni-heidelberg.de

First Heidelberg SCIA Limb Results

Thomas Wagner, S. Beirle, C. Frankenberg, C. v. Friedeburg, M. Grzegorski, J. Hollwedel, S. Kühl, M. F. A. Khokhar, S. Kraus, S.

Shangavi, W. Wilms-Grabe, M. Wenig, U. Platt

Institut für Umweltphysik, University of Heidelberg, Germany

Fit parameters and results

Influence of wavelength range & reference spectrum

First results

Conclusions & outlook


Reference Spectra:

O3: Bogumil et al., 223 & 243 KNO2: Vandaele et al., 220 KBrO: Wilmouth et al., 228 KOClO: Krominga et al., 213 KRing: Calculated (MFC)Polarisation: Ln(Xi) & Ln(Eta) from SCIA KeydataPolynomial: Degree 5Fraunhofer: One Limb Spectrum per orbit

(at lowest tangent height)

Shift: Spectrum shifted against Fraunhofer reference(linked to trace gas cross sections)


-0.045-0.04

-0.035-0.03

-0.025-0.02

-0.015-0.01

-0.0050

0.005

337 339 341 343 345 347 349 351 353 355 357

0.002

0.003

0.004

0.005

0.006

0.007

337 339 341 343 345 347 349 351 353 355 357

-0.008

-0.007

-0.006

-0.005

-0.004

-0.003

-0.002

337 339 341 343 345 347 349 351 353 355 357

-2.00E-03

-1.50E-03

-1.00E-03

-5.00E-04

0.00E+00

5.00E-04

1.00E-03

1.50E-03

337 339 341 343 345 347 349 351 353 355 357

NO2

BrO

O3

Ring

NO2 Analysis

of limb spectrum

at 26.5 km

with respect to

–2.5 km

tangent height


NO2 Analysis

of limb spectrum

at 26.5 km

with respect to

–2.5 km

tangent height

0.006

0.007

0.008

0.009

0.01

0.011

0.012

337 339 341 343 345 347 349 351 353 355 357

-0.08

-0.07

-0.06

-0.05

-0.04

-0.03

-0.02

337 339 341 343 345 347 349 351 353 355 357

Eta

Xi


-5.E+16

0.E+00

5.E+16

1.E+17

2.E+17

-10 0 10 20 30 40 50 60

NO2 Profiles along SCIA Orbit 4615

(DSCDs as function of tangent hight)


Comparison for NO2 analysis with limb or direct sun reference

Limb reference

Direct sun reference

-5.0E+16

0.0E+00

5.0E+16

1.0E+17

-10 0 10 20 30 40 50


0

0.02

0.04

0.06

0.08

-10 0 10 20 30 40 50

Sh

ift

[pix

el]


Limb reference

Spectral shift during a limb scan


-0.0025

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

0.001

337 339 341 343 345 347 349 351 353 355 357

BrO Analysis

of limb spectrum

at 23.3 km

with respect to

26.5 km

tangent height

-0.001

-0.0005

0

0.0005

0.001

0.0015

0.002

337 339 341 343 345 347 349 351 353 355 357

-0.06

-0.05

-0.04

-0.03

-0.02

-0.01

0

0.01

337 339 341 343 345 347 349 351 353 355 357

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

0.001

337 339 341 343 345 347 349 351 353 355 357

BrO

NO2

O3

Ring


BrO Analysis

of limb spectrum

at 23.3 km

with respect to

26.5 km

tangent height0.001

0.0015

0.002

0.0025

0.003

0.0035

0.004

337 339 341 343 345 347 349 351 353 355 357

-0.025

-0.02

-0.015

-0.01

-0.005

0

337 339 341 343 345 347 349 351 353 355 357

Xi

Eta


-0.0025

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

0.001

337 339 341 343 345 347 349 351 353 355 357

-0.003-0.0025

-0.002-0.0015

-0.001-0.0005

00.0005

337 342 347 352 357

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

337 342 347 352 357

-1.00E-03

-5.00E-04

0.00E+00

5.00E-04

1.00E-03

337 342 347 352 357

BrO Analysis in different spectral ranges

1.03e14

1.21e14

0.44e14

1.86e14


-2.0E+14

-1.0E+14

0.0E+00

1.0E+14

-5 5 15 25 35 45

Reihe1

Reihe2

Reihe3

Reihe4

-1.00E-03

-5.00E-04

0.00E+00

5.00E-04

1.00E-03

337 342 347 352 357

-0.003-0.0025

-0.002-0.0015

-0.001-0.0005

00.0005

337 342 347 352 357

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

337 342 347 352 357

-0.0025

-0.002

-0.0015

-0.001

-0.0005

0

0.0005

0.001

337 339 341 343 345 347 349 351 353 355 357

BrO DSCD for different wavelength ranges


-4.0E+14

-2.0E+14

0.0E+00

2.0E+14

4.0E+14

6.0E+14

-10 0 10 20 30 40 50

Comparison for BrO analysis with limb or direct sun reference


Limb reference


-1.0E+20

-5.0E+19

0.0E+00

5.0E+19

1.0E+20

1.5E+20

-10 0 10 20 30 40 50 60

Comparison for O3 analysis with limb or direct sun reference


Limb reference


-4.0E+14

-2.0E+14

0.0E+00

2.0E+14

-10 0 10 20 30 40 50

-5.E+16

0.E+00

5.E+16

-10 0 10 20 30 40 50

-1.0E+20

-5.0E+19

0.0E+00

5.0E+19

-10 0 10 20 30 40 50

Comparison of profile heights BrO

NO2

O3


Latitude

O3 SCD as function of latitude and tangent height

(orbit 6415, 17.01.2003)


Latitude

NO2 SCD as function of latitude and tangent height

(orbit 6415, 17.01.2003)


Latitude

BrO SCD as function of latitude and tangent height

(orbit 6415, 17.01.2003)


Conclusions & Outlook

• Development of limb UV analysis of BrO, NO2 and O3

• Polarisation sensitivity complicates DOAS fit

• Broad spectral range (337 – 357 nm) seems to give

most reliable (stable) results

• Dependence on altitude & latitude seems to be reasonable

• Determination of absolute SCDs (choice of Fraunh. reference)

• Further trace gases (OClO) and wavelength ranges (vis)

• Application of radiative transport and profile inversion

Fit parameters and results Influence of wavelength range & reference spectrum First results

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