GSI developments and plans at NCAR/MMM Tom Auligné Aimé Fournier, Hans Huang, Andy Jones, Hui-Chuan Lin, Zhiquan Liu, Yann Michel, Arthur Mizzi, Thomas.

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Presentation transcript:

GSI developments and plans at NCAR/MMM Tom Auligné Aimé Fournier, Hans Huang, Andy Jones, Hui-Chuan Lin, Zhiquan Liu, Yann Michel, Arthur Mizzi, Thomas Nehrkorn, Syed Rizvi, Hongli Wang, Xin Zhang National Center for Atmospheric Research NCAR is supported by the National Science Foundation GSI Data Assimilation Workshop - June 28, 2011

Focus at NCAR/MMM –Regional GSI –WRF-ARW model (NetCDF files) Projects funded by AFWA –AFWA Coupled Analysis and Prediction System (ACAPS) –AFWA Data Assimilation –AFWA Aerosols Collaboration with –GSI developers (EMC, GMAO, GSD, DTC) –JCSDA Introduction

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Background and Obs Errors: Community tools “Community GEN_BE” utility: –Includes all the features of WRFDA V3.2.2 –Multi-variate humidity –Generation of WRF-ARW background errors for GSI Extension of GEN_BE to include –Aerosol concentrations (univariate) –Cloud parameters (Qcloud, Qrain, Qice, Qsnow) Expansion of GSI control variable Observation error tuning with the diagnostic equations (Desroziers 2005)

Background Error Covariances: Masked Statistics

Michel et al. (MWR, 2011) Background Error Covariances: Masked Statistics

Background Error Covariances: Wavelets

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Variational/Ensemble Hybrid WRF/GSI Regional Hybrid Testing package: Cf. presentation by Arthur Mizzi

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Conceptual view of using displacements to characterize errors background error displacements of coherent features additive (residual) error =>+ Displacement Pre-Processing

Initial time: :00:00z Vortex displaced forward along track

18 Hour forecast time: :00:00z 18 hours later vortex maintains forward position

Collaboration between AER, MIT and NCAR Integration of displacements –Build on the existing API, with enhancements to add: –Support for multiple displacement algorithms Algorithmic developments –Constraints formulated and evaluated specifically for cloud-related fields Candidates: smoothness, non-divergence of displacements Application in: grid point, spectral, or wavelet space –Time evolution of displacements Characterize and model the time evolution of displacements Prepare for integration with 4D-Var –Figures of Merit for cloud-related fields Displacement Pre-Processing: Status and Plans

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

WRF Adjoint: WRF/GSI 4DVar New TL/AD code: WRFPLUS –Consistent with latest WRF-ARW (v3.3) –Includes simplified physics (surface drag, large-scale condensation, cumulus scheme, Kessler microphysics) WRF/GSI 4DVar –Based on GMAO 4DVar framework –New coupling between GSI and WRF/WRFPLUS Initial testing looks good. Cf. presentation by Xin Zhang

WRF Adjoint: Observation Impact Observation (y) WRFDA/GSI Data Assimilation WRF-ARW Forecast Model Forecast (x f ) Derive Forecast Accuracy Background (x b ) Analysis (x a ) Adjoint of WRF-ARW Forecast TL Model (WRF+) Observation Sensitivity (  F/  y) Background Sensitivity (  F/  x b ) Analysis Sensitivity (  F/  x a ) Observation Impact (  F/  y) Adjoint of WRFDA/GSI Data Assimilation Obs Error Sensitivity (  F/  ob ) Gradient of F (  F/  x f ) Define Forecast Accuracy Forecast Accuracy (F) Bias Correction Sensitivity (  F/  k ) Figure adapted from Liang Xu (NRL)

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Aerosol Satellite Observations Assimilation of MODIS Aerosol Optical Depth in GSI –Process MODIS AOD data (HDF to BUFR converter) –Use CRTM-AOD (Quanhua Liu) –Couple with WRF-Chem GOCART (14 aerosol species) Status and plans –Assimilate surface PM2.5 (ongoing) –Assimilate MODIS Visible/NIR radiances (planned, pending) Cf. presentation by Zhiquan Liu

Cloud Satellite Observations: Retrievals MODIS cloud retrieval products –Cloud liquid/ice water path, cloud optical depth, particle effective radius (1km resolution observations) –Cloud top properties: pressure, temperature, fraction/emissivity (5km resolution observations) Assimilation of MODIS Cloud Water Path –Process MODIS CWP data (HDF to BUFR converter) –Observation Operator (+ TL & AD) Status and plans –Assimilate MODIS CWP at convective scale (ongoing) –Assimilate MODIS Cloud Optical Depth (planned)

Very first shot at cloudy radiances, still needs a lot more work… Cloud parameters from WRF-ARW first-guess CRTM forward model and Jacobian Inclusion of cloud (microphysical) parameters in control variable (implemented in both WRFDA and GSI) Cloud Satellite Observations: Radiance Assimilation

Observation AIRS (12micron) Background (WRF-DART) Observation – Background

Simple B Matrix for cloud parameters copied from humidity Ensemble assimilation using the alpha control variable (no tuning) Cloud Satellite Observations: Radiance Assimilation

Clear observations only Cloud Satellite Observations: Radiance Assimilation Simple B Matrix for cloud parameters copied from humidity

Remaining issues include: - Bias Correction - Quality Control - Non-linearities in the observation operator - Representativeness Error Cloud Satellite Observations: Radiances

Pixel N k1 N k2 N k3 NoNo Cloud Top Pressure (hPa) MODIS Level2 AIRS MMR with Cloud fractions N k are ajusted variationally to fit observations: Cloud Satellite Observations: Radiances

CloudSat Reflectivity AIRS MMR Effective Cloud Fraction Cloud Satellite Observations: Radiances

Towards Cloudy Radiance Assimilation Pixel N k1 N k2 N k3 NoNo Cloud Satellite Observations: Radiances

31 Towards Cloudy Radiance Assimilation Simulated mismatch in resolution: - Perfect observations (high resolution) - Perfect Background (lower resolution) Innovations Background Cloud Satellite Observations: Representativeness

32 Towards Cloudy Radiance Assimilation New interpolation scheme: 1. Automatic detection of sharp gradients 2. New “proximity” for interpolation Innovations Background New Innovations Cloud Satellite Observations: Representativeness

The raw y o − y b (left) includes errors due to y o and y b coming from completely different representations, that (hypothetically) have been reconciled by the foregoing wavelet- coefficient selection procedure. Cloud Satellite Observations: Representativeness

Background and Observation Errors Variational/Ensemble Hybrid Displacement Pre-processing WRF Adjoint: 4DVar and Observation Impact Aerosol and Cloud Satellite Observations Verification Outline

Period: 4-17 June 2009 Analyses and 6 hr forecasts from 50-member ensembles using Data Assimilation Research Testbed (DART) system Verification: Test Case (courtesy Glen Romine) 15 km mesoscale, 3 km storm-scale

Verification: Validation Data World-Wide Merged Cloud Analysis (WWMCA) Main Archive: Quality-controlled, GOES East and GOES West over CONUS Covers January 1998 – December 2009 Resolution – 4x4 km for all channels except #3 which is 4x6 km Monthly/hourly cloud cleared background for all visible hours Monthly/hourly Cloud % using visible threshold Monthly/every other hour Cloud % using IR threshold since 2003 Addition hours of QC’d GOES West for May-Sept Example of GOES 8 background image

New WRF Adjoint for GSI 4DVar and Observation Impact Community tool for Background Error calculation (GEN_BE) Specific developments for Cloud and Aerosol assimilation Opportunity for inter-comparison Conclusion