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LETKF development at CPTEC
LETKF development at CPTEC
José A Aravéquia
GDAD – Data Assimilation Development
Group
CPTEC / INPE / Brazil
Jan 13, 2011
Department of Atmospheric and Oceanic Science UMD-AOSC
UMCP's Weather & Chaos Group - UMD
Assimilate Radio Occultation data and GNSS data
South America Regional Reanalysis (RRAS)
First steps towards Variational QC
Assimilation of Precipitation
Development of Local Ensemble Transform Kalman Filter
(LETKF)
Support for Physical-statistical Space Assimilation System
(PSAS)
Development of surface data assimilation
Development (studies ) of satellite data assimilation (radiances) :
AMSU-A (Aqua-Terra) and GOES-10 (visible and IR)
Development of a Collaborative tool to evaluate experiment
results (statistics using Fortran and free graphical library)
Aerosols data assimilation
Web page for monitoring and divulgation
Activities at GDAD
Simplified Data flow
Preprocessing and Assimilation
Saulo M. de Jesus; Sérgio H. S. Ferreira
CPTEC
ASSIMILATION
LETKF_MCGA/CPTEC
Implementation steps:-LETKF ERIC Interfaces : model MCGA/CPTEC<->
LETKF (It was not easy as we were
thinking before to start);
Coding resolution changes to be
friendly (original T062L28);
Coding for use of NCEP PREPBUF
observations ;
- LETKF TAKEMASA (parallel version, T062L28)
- Actual effort : tuning experiments.
Goal : To produce operational analysis and forecast using LETKF - MCGA/CPTEC
Solange S. de Souza; José A. Aravéquia; Paulo Kubota
LETKF/MCGA_T126L28 using AMSU-A radiances
Temperature RMSE – Area mean over South America
Analysis and Forecast (48h) LETKF: 20 members
CRTM
Maria das Dores Medeiros – Master degree dissertation thesis
Radio Occultation GNSS Assimilation
(Global Navigation Satellite System)
Luiz F. Sapucci, Derek S., et al.
6 satellites – COSMIC project Assimilation of COSMIC profiles
within PSAS:
– First experiments are now been
evaluated;
Future experiments will be using
LETKF:
– Developing observation
operator to assimilate
refractivity profiles.
(2500 profiles/day)
Ground GPS receptors network over Brazil
Assimilation of GNSS surface station data
In pre-operational mode in PSAS :
using IWV information;
Is planned to be used in LETKF :
using Zenithal delay information (direct
information).
Observation network expansion in place:
• Brazilian Continuous Monitoring Network
(IBGE-INCRA): 67 stations;
•São Paulo state network ( FAPESP): 11
stations;
•SIPEC Project Geophysics INPE
(Petrobras-INPE): 85 station;
Total 163 station
A scientific designed GPS receptor over surface gives troposphere zenithal delay
measures that are used to retrieve IWV values.
Luiz F. Sapucci, Derek Silva, et al.
Regional Reanalysis - CPTEC 20km
RPSAS/EtaWorkstation - 10 years
Goal : To provide to meteorological community regional gridded analysis over
South America with high resolution for the period of 2000 – 2009.
Needs:
Storage: 9 Tb Disc space;
Computer resource (4 processors to PSAS and 32 to Eta model):
14.600 hours (in the UNA cluster);
10.220 hours – “split period” run version (runs fast, but could have
spin up problems).
Availability of new supercomputer CRAY XT6
Luiz F. Sapucci, Derek Silva, et al.
Precipitation Assimilation in the Eta+RPSAS 20 km
Carlos F. Bastarz; Julio P. R. Fernandez; Dirceu L. Herdies
GOES 8 (20030123-06Z)
Precipitation Assimilation – TRMM 3B41
Scheme: Precipitation Nudging at First Guess (Convective
Adjustment at grid point) in the Eta Model;
Method: based in Carr and Baldwin 1991, similar to the
EDAS no NCEP (last version – 2005);
Assimilation: instantaneous rate (mm/h) along 3 hours
period;
Improvement : at First Guess (6 hours fcst) and Analysis
MCC – Jan 23, 2003
CAP: with precipitation data assimilated;
SAP: : without precipitation data assimilated;
Forecast 6h (CAP) it reproduces the MCC
precipitation – First Guess;
SA
PC
AP
TR
MM
Aerosols Assimilation < 2.5 µm (PM25)
Gabriel B. Münchow; Judith J. Hoelzemann; Karla Longo; Dirceu Herdies; Saulo Freitas
Land Data Assimilation
1. Simulation of Surface: 28 years
(1979-2006) / MERRA – LIS
2. Surface Reanalysis (2000-2004) /
SALDAS – LIS
3. Surface Multi Model Ensemble
(2000-2004) / SALDAS – LIS
4. High Resolution simulation for La
Plata Basin (1 km) SALDAS – LIS
João Gerd Z. de Mattos, Luis Gustavo G. de Gonçalves
2009/2010 Progress
La Plata basin volumetric
soil moisture at 1Km
resolution (January 2000)
La Plata basin integrated
total runoff (Kg/m2) at 1Km
resolution (January 2000)
High Resolution Simulation over LPB
(a)
(b)
Correction and Downscaling of TRMM
Precipitation
•Domain : South America
•Resolution: 10 Km
•Period: 2000 – NowVila et al., 2009 - JHM
TRMM Corrigido
De Goncalves et al., 2009 - JHMSALDAS (South American Land Data Assimilation System)
Tool for evaluation of experiments results:
SCAMTeC – Community Tool for Experiments Results Evaluation
João Gerd, Luiz Sapucci, Carlos Bastarz, Derek Schubert,
Ronaldo Ribeiro, Luis Gustavo.
Data assimilation WebPage – Results,
Monitoring Tools and Documentations
http://assimila.cptec.inpe.br
Andresa Fogaça; Saulo Magnum; Luis Fernando Sapucci; Dirceu Luis Herdies
Future Goals for GDAD team
Main Goals (2010-2011)
1. Operational Implementation of LETKF for MCGA-CPTEC
2. Development of variational QC
3. Use of Level 1 observations in LETKF
modelsregionalCPTEC’sforLETKFofImplementation.4
D.A. of non-conventional data, like GNSS (Radio Occultation)
Support for ensemble forecast suite using LETKF analysis
D.A. of earth surface variables (off-line and coupled mode) within
MCGA-CPTEC and regional models
Support for ocean D.A. (using LETKF)
Aerosols and chemistry D.A. Regional and Global model
High resolution Regional Re-Analysis over South America
(RPSAS)
Development of RADAR and Precipitation D.A.
Support for operational of PSAS suites (while it last!)
How GDAD is going to achieve those goals ??
Human Resources:
Amanda V. da Silva (Curs. Gestão Empr. FATEC)
Office
Andreza Fogaça Coelho (Bel. Unisal)
Web Designer
Carlos Bastarz (MSc. INPE)
Precipitation D.A.
Dérek S.V. de Souza (Bel. FATEC)
Computer Support
Dirceu Luis Herdies (Dr. USP)
PSAS, Regional Modeling, QC
João Gerd Zell de Mattos (MSc. INPE)
Surface D.A.
José Antonio Aravéquia (Dr. USP)
Retrievals and radiances D.A., Kalman Filter
Julio Pablo R. Fernandez (Dr. INPE)
AD Kalman Filter, Regional Model
Luiz Fernando Sapucci (Dr. UNESP)
AD PSAS, radio occultation, reanalysis
Ronaldo Sávio S. Ribeiro (Tec. UniTau)
Saulo Magnum de Jesus (Bel. Unisal)
Programmer, Web Designer
Sérgio Henrique Soares Ferreira (MSc. INPE)
AD PSAS, QC, data processing
Solange Silva de Souza (Dr. INPE)
AD LETFK, convection, global model
Stephen English (PhD. University of Reading)
Team Scientific Coordinator
UKMet Office satellite data specialist
Luis Gustavo G. de Gonçalves (PhD. University of Arizona)
Team Coordinator
Surface D.A.
Luciano P. Pezzi (PhD University of South Hampton)
Collaborator
Ocean D.A.
Judith J. Hoelzemann (Dr. Max Plank)
Collaborator
Aerosols and chemistry D.A.
Gabriel (MSc. INPE)
Master Student
Aerosols and chemistry D.A.
Maria das Dores da S. Medeiros (Bel.)
Master Student
retrievals, radiances D.A.
Bruna Silveira
Master Student
RTM, Radiances D.A.
Fábio L.R. Diniz (Bel. UFPel)
Master Student
Radiances and RADAR D.A.
How GDAD is going to achieve those goals ??
Human Resources: