ketevan kasradze [email protected] supervisor: pd dr. hendrik elbern
DESCRIPTION
4D-var assimilation of CRISTA-NF H20 and MLS retrievals with the high resolution SACADA system. Ketevan Kasradze [email protected] Supervisor: PD Dr. Hendrik Elbern Rhenish Institute for Environmental Research at the University of Cologne Germany. Atmospheric layers. 3 /18. Why?. - PowerPoint PPT PresentationTRANSCRIPT
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
121)(
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 0xQuasi-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
OHHO2
NONO2 Cl ClO
BrBrOH2
CH4
CH3ClCCl4
CFCl3
CF2Cl2
CHF2ClCF2ClCFCl2
CH3CCl3
CH3Br CF2ClBr
CF3BrCH2O 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
Obs
erva
tion
Ba
ckgr
ound
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