Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Ketevan [email protected]
Supervisor: PD Dr. Hendrik Elbern
Rhenish Institute for Environmental Researchat the University of Cologne
Germany
4D-var assimilation of CRISTA-NF H20 and MLS retrievals with the high resolution SACADA system
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Atmospheric layers
3/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Why?
4/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Data assimilation
„using all the available information, to determine as accurately as possible the state of the atmospheric (or oceanic) flow”
Talagrand (1997)
available information:– observations– background
5/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Data assimilation
1st day 2nd day t
Xa
Xb
BackgroundAnalysis
Xb
6/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
N
iii
Tibx yHxRHMxxBxJ
0
1*0
10 )(
0
N
iii
Tiib
Tb yxMHRyxMHxxBxxxJ
00
100
100 2
1
2
1)(
Background error covariance matrix54x23 042 ~ 1x10^6BECM ~ 4x10^11 for 51 species ~ 80 Terrabyte
Cost function
Vector of observations
Observation error covariance matrix
Projection operator
BackgroundModel operator
GradientAdjungiertes Modell
)(),(, 000 0xJxJx x 0x
Quasi-Newton method L-BFGS
SACADA assimilation-system
7/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
SACADA assimilation-system
Background Meteorological ECMWF analyses
Trace gas observations
Analysis
SACADA
PREPDWD GMECTM
CTMadDiffusion
L-BFGS
8/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Horizontal GME Grid
• ~147km between the grid points,• 23 042 grid points pro Model layer
9/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan KasradzeAd
ditio
nal r
efine
men
t tro
posp
here
/low
er
stra
tosp
here
SACADA Vertical Grid54 layer
CRISTA-NF
MLS
10/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Chemistry
H2O2
H2O
NO3
N2O
N2O5
HNO3
HNO4
Cl2O2
OClOCl2
HClHOCl ClONO2
BrClHBr
HOBrBrONO2
O(1D) O(3P)
O3
H OH
HO2
NONO2
Cl ClO
BrBrOH2
CH4
CH3Cl
CCl4
CFCl3
CF2Cl2
CHF2Cl
CF2ClCFCl2
CH3CCl3
CH3Br
CF2ClBr
CF3Br
CH2O
CH3O
CH3O2
CH3OOH
CH3
HCO CO O2
N2
51 species 200 chemical reaction equations
Reaction rates: JPL 2006 recommendations
KPP (Kinetic Preprocessor)• ROS2• Chemistry Module• Adjoint Chemistry Module
11/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
SCOUT-O3 campaign Stratospheric-Climate Links with Emphasis on the UTLS - O3
November-December 2005
AMMA-campaign African Monsoon Multidisciplinary Analyses
29.07.2006 -17.08.2006
12/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Assimilation Results
• Background – Derived from SOCRATES (=2D) model results (1-st day) – At the following day: Analyses of the day before
• Observations– MLS retrievals – CRISTA-NF retrievals
• Analyses– Ozone analyses from SACADA for 7.11.2005
• Pressure level 30 (~ 137hPa)
– H2O profiles from SACADA for 29.07.2006
13/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
A
naly
sis
O
bser
vatio
n
Back
grou
nd
Ozone O3
7.11.2005
~137hPa ~14km
12 h UTC
14/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
CRISTA-NF - Background MLS
29.07.2006
Asm: H2O20km
10km
20km
10km
15/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Computational costs
Fine grid (ni=48, lev=54) with new chemistry mechanism, timestep: 800sec.
1 day assimilation: – ~50 GB temporary storage– ~10 clock hour (16 AMD OPTERON processor)
16/18
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Acknowledgements to:
Garmany. University of Cologne. Rhenish Institute for Environmental Research at the University of Cologne.Prof A. Ebel, Prof A. Wahner, Dr. J. Schwinger, all my co-workers and especially my supervisor Dr. H. Elbern.
Tbilisi State University. Applied mathematics and computer sciences department stuff.Prof. R. Botchorishvili, Dr. M. Menteshashvili.
Tbilisi, 6.08.2012
www.riu.uni-koeln.de Ketevan Kasradze
Thank you!Danke schön!
!დიდი მადლობა
Top Related