retrievals of stratospheric ozone density profiles from odin osiris limb scatter measurements
Download
Skip this Video
Download Presentation
Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements

Loading in 2 Seconds...

play fullscreen
1 / 23

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


  • 132 Views
  • Uploaded on

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,

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Retrievals of Stratospheric Ozone Density Profiles from Odin/OSIRIS Limb-Scatter Measurements' - shiela


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
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

slide2

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
slide4

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.
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
ad