Retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements
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Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements PowerPoint PPT Presentation


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Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements. C.S. Haley York University S.V. Petelina University of Saskatchewan and the OSIRIS Team. Method. Step 1: Normalization of limb radiance profiles. with TH i being the i th tangent height,

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Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements

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Retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements

Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements

C.S. Haley

York University

S.V. Petelina

University of Saskatchewan

and the OSIRIS Team


Retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements

Method

Step 1: Normalization of limb radiance profiles

with THi being the ith tangent height,

THref reference tangent height

Reduction of the impact of albedo on limb radiance profiles

Step 2: Combination of wavelengths

  • Employ the Chappuis absorption bands of O3,

  • and define the Chappuis retrieval vector yC(TH) by


Retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements

OS Limb Scan


Retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements

Optimal Estimation

xn+1 = x0 + SxKnT[KnSxKnT + S] -1 (y - yn - Kn(x0-xn))

S = Sx - SxKT[KSxKT + S]-1KSx

x0: ln of a priori O3 profile

xn: ln of nth estimate

y: ln of measured Chappuis retrieval vector

yn: ln of modelled Chappuis retrieval vector for xn

Sx: covariance matrix of a priori

S: covariance matrix of measurement y

K: Weighting function matrix

  • Forward model is LIMBTRAN [Griffioen and Oikarinen, 2000]

  • Pseudo-spherical: SS treated in spherical shell atmosphere

  • Diffuse radiance source functions calculated in 1-D plane

  • parallel atmosphere applying the finite differences method.

  • Variation of SZA and  along LOS.


Os and toms ozone column daily maps 25 february 2002

OS and TOMS ozone column daily maps25 February 2002


Os poam comparisons

OS – POAM Comparisons


Os poam comparisons1

OS – POAM Comparisons


Os poam comparisons november 2001

OS – POAM ComparisonsNovember 2001


Os poam comparisons february 2002

OS – POAM ComparisonsFebruary 2002


Os poam comparisons december 2001

OS – POAM ComparisonsDecember 2001


Os poam comparisons june 2002

OS – POAM ComparisonsJune 2002


Os sage comparisons november 2001

OS-SAGE ComparisonsNovember 2001


Os sage comparisons february 2002

OS-SAGE ComparisonsFebruary 2002


Os sage comparisons june 2002

OS-SAGE ComparisonsJune 2002


Os sage comparisons july 2002

OS-SAGE ComparisonsJuly 2002


Os sonde comparisons

OS-sonde Comparisons


Os sonde comparisons1

OS-sonde Comparisons


Ozone hole split in september 2002

Ozone hole split in September 2002


Ozone hole split in september 20021

Ozone hole split in September 2002


Ozone hole split in september 20022

Ozone hole split in September 2002


Ozone hole split in september 20023

Ozone hole split in September 2002


Ozone hole split in september 20024

Ozone hole split in September 2002


Future work

Future Work

  • Good agreement between OSIRIS, POAM III & SAGE II

  • Data is now being used in some preliminary assimilation studies and to evaluate other retrieval methods (DOAS, BIN, MOP)

  • Apparent tangent height registration issues that need to be addressed

  • Addition of UV wavelengths required to improve upper stratosphere retrievals – in progress


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