Variability in Ozone Profiles at TexAQS within the Context of an US Ozone Climatology
NNORSY-GOME Ozone Profile Retrieval Products and Climatology
Transcript of NNORSY-GOME Ozone Profile Retrieval Products and Climatology
NNORSY-GOME Ozone Profile Retrieval Products and Climatology
A.K. Kaifel, J.S. Kaptur (ZSW),
J.C. Lambert, C. de Clercq (BIRA-IASB),
T. Erbertseder, F. Baier (DLR-DFD)
J.M. Krijger, I. Aben (SRON)Center for Solar Energy & Hydrogen Research (ZSW), Stuttgart, Germany
Belgian Institute for Space Aeronomy (BIRA-IASB), Brussels, Belgium
German Aerospace Center (DLR), Oberpfaffenhofen, Germany
Space Research Organization Netherlands (SRON), Utrecht, Netherlands
ITSC-16, May 2008, Angra dos Reis, Brazil
funded by ESA under Contract: 17892/03/I-LG
Outline
1. NNORSY and Optimal Estimation (OE)
2. Approach for NNORSY
3. Local error estimation
4. NNORSY-GOME ozone profile products
5. Validation: Geophysical and data assimilation
6. Application for NNORSY-GOME data set
7. Dynamic ozone profile climatology
8. Summary
NNORSY-GOME Ozone Profile Retrieval Products and Climatology
ITSC-16, May 2008, Angra dos Reis, Brazil
Op
tim
al
Est
imati
on
x
O3 profile
p(x|y)p(y|x) p(x)
p(y)=
x
"a priori"
y
GOMEspectrum
y
x
… …
k(x,y)
collocated measurements
yx RTM
OptimalEstimation
z.B. FURM, OPERA, ...
NNORSY
~1 min/profile
~1 ms/profile
NN
OR
SY
Co
mp
ari
son
of
retr
ieval
ap
pro
ach
es
ITSC-16, May 2008, Angra dos Reis, Brazil
Overview NNORSY-GOME
operationalreal-time
processing
GOME profiles
Operation
trainingdata
neuralnetworktraining
randomdata
mixing
testdata
eval.data
networkparam.s
qualitycheck
Training
GOMELevel 1
data
WOUDCsondes
collocatedspectra/ profiles
collocation
SHADOZsondes
SAGE, POAM, HALOE
profiles
collocation
collocation
Preprocessing
ITSC-16, May 2008, Angra dos Reis, Brazil
NNORSY (Neural Network Ozone Retrieval System)
GOMEspectral
data
geolocation
meteorol. info
climatologicalpredictors
yi
Input data for neural network
NNORSY-GOME Input Parameters
270 – 325 nm (O3 Hartley & Huggins)380 – 385 nm (atmosph. window)598 – 603 nm (O3 Chappuis)758 – 772 nm (O2→ cloud info)SZA, SAAsensor scan angleLOS type (east, nadir, west)GEOS4 temperature profileLatitudeSeason and sensor age
ITSC-16, May 2008, Angra dos Reis, Brazil
Example for NNORSY Ozone Retrieval
y
t
training data 1
y
t
training data 1
o
NNORSYretrieval
|o-t|
training data 2
error networktraining
Estimation of Local Retrieval Error
NNORSYerror estimation
ITSC-16, May 2008, Angra dos Reis, Brazil
NNORSY-GOME Processing Model
TOZ
TCO
SCO
TORGDP-SCO
Lv2 profile
TORTOMS-SCO
Trop.mean VMR
Level 2 ozoneprofile data
Level 3 totalozone column
Level 3 troposphericOzone column
Level 3 stratosphericOzone column
Level 3 troposphericozone residual using GDP4 data
Level 3 troposphericozone residual using TOMS V8 data
Mean troposphericozone volume mixing ration
NNORSY ozone profile retrieval output data
1.2 TB
GDP4 TOZ
TOMS TOZLv3
TPH GEOS4Lv3
NNORSY-GOME
processing
GOME Lv1file list
NN retrievalcoeff. file
Gdp_ex
NN indexfileNN error
coeff. file
Neural network inputparameter files Optional auxiliary
Input data
GOME Lv. 1 ESA
GOME Lv1file list
GOME Level 1 ZSW
GEOS4T-profile
ITSC-16, May 2008, Angra dos Reis, Brazil
Ozone Error: %
Ozone Number Density: 1e18/m³
Vertical Sampling: 1 km
Maximum Altitude: 61 km
Minimum Altitude: surface
Level 2 Profiles
Number of Orbits/Profiles: 36694/48.579.769
End Date: 05/31/2003
Start Date: 09/01/1995
Temporal coverage
Ozone Error: %
Ozone Number Density: 1e18/m³
Vertical Sampling: 1 km
Maximum Altitude: 61 km
Minimum Altitude: surface
Level 2 Profiles
Number of Orbits/Profiles: 36694/48.579.769
End Date: 05/31/2003
Start Date: 09/01/1995
Temporal coverage
GEOS4 surface pressure
GEOS4 T-profile
Stratospheric Ozone: DU
Tropospheric Ozone: DU
Tropopause Height: km
Total Ozone: Integr. NNORSY-profiles & TOMS (DU)
Pressure: hPa
Additional Data
GEOS4 surface pressure
GEOS4 T-profile
Stratospheric Ozone: DU
Tropospheric Ozone: DU
Tropopause Height: km
Total Ozone: Integr. NNORSY-profiles & TOMS (DU)
Pressure: hPa
Additional Data
NNORSY-GOME Ozone Profile Data Set
ITSC-16, May 2008, Angra dos Reis, Brazil
GOME Instrument Degradation
ITSC-16, May 2008, Angra dos Reis, Brazil
Ratio between model and measurement (yearly average)
Mg Solar lines
Mission start
Validation with Data Assimilation
ITSC-16, May 2008, Angra dos Reis, Brazil
CTM Model
Based on ROSE/DLR assimilation system, Version 3.0 (Baier et al., 2006)
Horizontal optimum interpolation scheme with analyzed error (Kalman Filter)
Comprises all relevant chemical and dynamical processes of stratosphere
DA system driven by UK Met Office wind and temperature fields
Grid parameter:
Vertical coverage: 1000 – 0.1 hPa
Vertical discretisation: 43 Levels
Horizontal resolution: 2.5° x 3.75° resolution
Why
Global quality control by first guess and error statistics
Identification of outlier or systematic errors
Check of retrievals for areas of known GOME problems (SAA)
Grid parameter:
Data Assimilation Overview
ITSC-16, May 2008, Angra dos Reis, Brazil
Forecast
OI
Profile Correction
NNORSY
CTM
Input = NNORSY-GOME retrievals
Output = 3D global ozone analysis
First Guess
OMF = observation minus first-guessAMO = analysis minus observationAMF = analysis minus first-guess
Diagnostic parameters derived
Validation with Data Assimilation
ITSC-16, May 2008, Angra dos Reis, Brazil
Zonal Means of First-Guess minus Observation Error (FMO)January, April, July, October
Validation with Data Assimilation
ITSC-16, May 2008, Angra dos Reis, Brazil
Daily zonal means of FMO Error at 100 hPa
NNORSY-GOME Application: Ozone Reanalysis for Climate Model Evaluation (1/2)
ITSC-16, May 2008, Angra dos Reis, Brazil
GOME/NNORSY reanalysis vs ECHAM E39/C
100 hPa
50 hPa
30 hPa
10 hPa
1996 1999 1996 1999
0 2 4 6 8 ppm(v) 0 2 4 6 8 ppm(v)
NNORSY-GOME Application: Ozone Reanalysis for Climate Model Evaluation (2/2)
ITSC-16, May 2008, Angra dos Reis, Brazil
NNORSY-GOME reanalysis vs ECHAM E39/C
0 2 4 6 8 ppm(v) 0 2 4 6 8 ppm(v)
#1Time
TOZ
T-profile
#2 #3 #4
#5 #6
#7 #8
ozoneprofile
temperatureprofile
#9 #10
#3 #4
stdv stdv
INPUT-PARAMETER
CLIMATOLOGY-CALCULATION
MODE 1
MODE 2
MODE 3
MODE 4
NNORSY Dynamic Ozone Profile Climatology
ITSC-16, May 2008, Angra dos Reis, Brazil
NNORSY Ozone Profile Climatology
Example for single profiles: Tropics, Antartica
ITSC-16, May 2008, Angra dos Reis, Brazil
NNORSY-GOME: Summary
► Almost 10 year global NNORSY-GOME ozone profile data set
► Geophysical validation and comparison with sonde/lidar/satellite
► Extending GOME ozone profile data record with SCIAMACHY
ITSC-16, May 2008, Angra dos Reis, Brazil
► NNORSY application to SCIAMACHY nadir
► Various tropospheric ozone column products
► Validation and global consistency check with data assimilation
► New dynamic ozone profile climatology
► All products and data are available: http://nnorsy.zsw-bw.de
► NNORSY compensate for instrument degradation