henk eskes, william lahoz, estec, 20 jan 2004 the role of data assimilation in atmospheric...
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
The role of data assimilation in atmospheric composition monitoring and forecasting
Henk Eskes, William Lahoz
1. Royal Netherlands Meteorological Institute, De Bilt, The Netherlands2. Data Assimilation Research Centre, University of Reading, UK
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
1) From sequential sets of data points to synoptic global fields
Complementarity:Measurements - Snapshots of the atmospheric stateModel - Describes the evolution of the atmosphere
Data assimilation works best for long-lived tracers (or slowly-varying emissions)
Value adding: Easy to use synoptic 3D fields
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
"from gaps to maps"
MIPAS ozone analysis10 hPa22 Sep 2002
Courtesy: Alan Geer, DARC
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
2) Propagation of information to data-poor regions and unobserved variables, unobserved chemical species
Examples:• Atmospheric chemistry: effective number of degrees of freedom smaller than number of species. Measurement information transferred to unobserved species • Tracer transport: the wind will carry information from observed to unobserved regions, e.g. the dark winter pole• NWP and ozone: ozone observations contain information on the wind field
Depends critically on the quality of the model andobservations *
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Impact of ozone on NWP
Wind increments due toTOVS ozone observations
ECMWF model
Courtesy:Elias HolmECMWF
Wind increments ~ 0.5 m/s
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Unobserved species
Elbern, SchmidtJGR 104, 18583 (1999)
Impact of ozoneobservations onNO, NO2
in 4D-VarForecast
Analysis,truth
observation
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
3) Confronting models with data, data with analyses
Detailed feedback on:• quality of the model - understanding• quality of the observations
Observation minus forecast statistics
Validation with data assimilation
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Feedback on retrieval
Sciamachyozone columnretrieval at KNMI
Observationminusforecastvs.Solar zenith angle
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
4) Use of complex observations and heterogeneous data sets
Complex observations:Satellite (remote sensing) observations have complicated relation with atmospheric composition
Described by averaging kernels, which complicates interpretation
Use of averagingkernel in data assimilation straightforward (in principle):Observation operator = averaging kernel
Heterogeneous data sets:Combine satellite observations (different geometries, techniques) androutine surface observations, e.g. NWP
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Kernels for total column observations
Examples:- TOMS O3
- GOME NO2, H2CO- MOPITT CO
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
5) Emission estimates based on satellite observations
Data assimilation and inverse modelling involve the same technique
Assimilation: state analysisInverse modelling: source/sink estimates
Assimilation is more general and combined 3D field and source/sink analysis logical extension of state analysis
Example:4D-Var source/state approach, applied to CH4 from Sciamachy
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
CH4 emission analyses based on Sciamachy observations
Courtesy:Jan Fokke MeirinkKNMI
Analysisminus forecastemissions
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
6) Monitoring of the environment, trends
Re-analysis based on available satellite and ground-based observations
Combination of different data sets with a model allows a detailed bias correction to be determined and applied to the various data setsto account for differences between instruments, techniques, drifts.
Trend analysis: Very tricky!
Examples:• ECMWF temperature data set from ERA-40• GOME ozone assimilation data set, 1995-2003
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
ECMWF ERA-40 reanalysis temperature trend
Red: ERA-40 (EU final report, nov 2003)Blue: Jones & Moberg, J. Climate, 16 (2003)
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Re-analysis of GOME ozone
www.knmi.nl/goa
EU GOAProject
Based onGOME GDP v3columns
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
7) Quantify benefit for future missions: OSSE
Observing system simulation experiment:
Approach:• Draw synthetic observations from reference run• Assimilate these in a model run with perturbed initial conditions / emissions / model parameters• Quantify the impact of these synthetic observations
Examples of OSSE:• Impact of SWIFT stratospheric winds on NWP
W. Lahoz et al, QJRMS submitted, 2003• Impact of ozone observations on wind field• Impact of Sciamachy CH4 column observations
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
OSSE: Impact of TOVS ozone column on NWP winds
A. Peuch et al, QJRMS 126, 1641, 2000
Zonal wind
Merid. wind
NH TR SH
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Courtesy:Jan Fokke MeirinkKNMI
Simulated observations
OSSE: Impact of Sciamachy CH4 for emission estimates
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Courtesy:Jan Fokke MeirinkKNMI
Simulated observationerrors
OSSE: Impact of Sciamachy CH4 for emission estimates
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Courtesy:Jan Fokke MeirinkKNMI
Changes inthe methane field
OSSE: Impact of Sciamachy CH4 for emission estimates
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Courtesy:Jan Fokke MeirinkKNMI
Analysisminus forecastemissions
OSSE: Impact of Sciamachy CH4 for emission estimates
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
OSSE: Impact of Sciamachy CH4 for emission estimates
Courtesy: Jan Fokke Meirink, KNMI
EXPERIMENT R
default 0.21
all pixels cloudfree 0.61
perfect obs. 0.88
correlation between emissions
0.65
R = RMS reduction factor
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
8) Atmospheric composition forecasts - chemical weather
Assimilation analysis to initialise a chemical forecast:
Examples:• Stratospheric ozone forecast • BASCOE
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Analysisbased on GOMEozone columnobservations15 April 2001
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
TOMS 15 April 2001
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Anomaly correlation
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Ozone hole breakup, 2002
26 September 2002Analysis based on GOME
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Ozone hole breakup, 2002
26 September 20027-day forecast
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Ozone hole breakup, 2002
26 September 20029-day forecast
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Stratospheric chemical forecasts based on MIPAS observations
Courtesy:Dominique Fonteyn
www.bascoe.oma.be
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Henk Eskes, William Lahoz, ESTEC, 20 Jan 2004
Summary
Data assimilation as value-adding instrument: • Fill gaps in data records• Propagation of information: data-poor regions, unobserved variables and chemicals, emissions• Confronting models with data (understanding), observations with models (validation)• Use of complex data: heterogeneous data sets, remote sensing• Sources and sinks as part of the analysis• Long-term monitoring, trends, climate change• Quantify benefit of future missions: OSSE studies• Forecasts of atmospheric composition: "chemical weather"