INM

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INMs contribution to ELDAS project

• E. Rodríguez and
• B. Navascués
• INM

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Outline

• Latest modifications in the HIRLAM surface
  package (assim.param.)
• Work on progress
• 3 planned experiments REF,ELD,SVA, (TIL?)
• Definition of REF experiment
• Preliminary exercise (HIRLAM TR No.59)
• Evaluation strategy
• Physiography ECOCLIMAP
• Time schedule

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Latest modifications of the HIRLAM surface
package (assim.param.)

• Explicit treatment of soil water freezing/thawing
  
• Re-computation of structure functions for T2m and
  RH2m analyses
• New snow depth analysis based on OI
• Additional tile for snowed bare and low
  vegetation surfaces (use of predictive equations
  for snow albedo, density. Freezing/thawing of
  water retained by snow)
• Subgrid run-off (consequence of RhoneAggr
  Experiment)
• Tuning of Zo for certain land uses

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Subgrid runoff (Dumenil Todini, 1992)
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Work on progress

• Implementation of the SVA assimilation of soil
  moisture (Balsamo) on the HIRLAM system
  preliminary tests
• Tests with the new physiographic database
  ECOCLIMAP in the HIRLAM environment

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3 planned experiments

• REF
• ELD same as REF but with soil moisture generated
  by CNRM
• SVA same as REF but with SVA assimilation of
  soil moisture (Gianpaolo)

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Definition of the REF experiment (I)

• Latest reference HIRLAM version (6.2.0) Some
  of the improvements in the pipeline
• No tiles (acceptable degradacion!)
• Both HIRLAM and the soil moisture generator model
  (CNRM) should use the same physiography. Ideally
  the CNRM should produce vegetation and soil
  fields (from ECOCLIMAP?) for both models
• Grid geometry? HIRLAM usually runs on a rotated
  grid. Minimize (or suppress) horizontal
  interpolations! ARPEGE grid ? HIRLAM grid using
  closest grid point for both climate files
  (ECOCLIMAP) and SWI

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Tiling versus no tiling
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Definition of the REF experiment (II)

• 3D-VAR assimilation, 6h cycling
• Lateral Boundaries ECMWF analysis
• 0.2ºx0.2ºx31L
• SL timestep
• Domain? DMR?
• 48h forecast from 00 (or 12) UTC analysis only

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Parallel runs (H5.1.1)

• Comparison against version 5.1.1, using DMR (0.5
  degrees, 31L, ECMWF area)
• Summer case (1-15 July 1995)
• Winter case (1-14 Jan. 1996)
• Fall case (1-15 Oct. 1994)
• Spring case (12-28 April 1998) thanks to Simo
  Järvenoja

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Preliminary exercise close to the REF experiment

• Seasonal assimilation experiment (Apr.95?Apr.96)
  mainly designed to assess the long term behaviour
  of the surface HIRLAM package (param assim).
• See HIRLAM Tech.Rep.No.59 (available from HIRLAM
  web page)
• Time evolution of slow evolving variables and
  diagnostic tools to assess performance of the
  surface analysis.
• Also topics as convergence of the assimilation
  algorithm and evolution of different tiles within
  a grid square are thoroughly discussed.

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Explore subgrid evolution
Possibly and depending on our resources, well
run a 4th experiment with tiling structure same
as REF, but including the same land tiles as in
the HIRLAM reference system
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Number of effective soil moisture corrections
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Evaluation strategy for the 3 experiments

• Soil moisture evolution (over the whole domain,
  over Europe, over specific regions)
• Study of soil moisture analysis increments
• Near surface maps (T2m, RH2m) of monthly averaged
  bias, rms error
• Verification scores against surface stations
  (T2m, RH2m) and radiosoundings.
• Surface heat fluxes
• Single grid point diagnostics
• Compare ELDAS products (precip., radiation and
  heating rates) with the corresponding HIRLAM
  fields.

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ECOCLIMAP database(Masson et al., 2003) (I)

• Global and high resolution dataset (1-km).
• Detailed information over Europe coming from
  CORINE and PELCOM projects.
• Use of full resolution maps of the vegetation
  index NDVI to provide the appropiate temporal and
  spatial scales.
• 215 ecosystems allowing a better assignement of
  vegetation parameter sets. (90 over Europe)
• Use of aggregation rules to derive surface
  parameters at the desired model resolution and
  for mixed ecosystem pixels.
• It allows the tiling approach, as used by the
  HIRLAM surface scheme.

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Topics for discussion on ECOCLIMAP
database(Masson et al., 2003) (II)

• It is highly sophisticated as compared with the
  current HIRLAM physiographic description and it
  allows many possible choices
• Vegetation parameters (veg, lai, Zoh, Zom, alb,
  Rsmin, frac, emis, ...) with monthly or decennial
  (10 days) frequency.
• Compatible with tiling.
• Not yet enough tested in HIRLAM system.
• Straightforward usage for lat/lon coordinates.

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Time schedule

• First trial for 3 experiments (REF, ELD and SVA)
  (1-6 June 2000) (Dec. 2003)
• May ? Dec 2000 with REF exp. started (Dec. 2003)
• May ? Dec 2000 with SVA exp. started (Jan. 2003)
• May ? Dec 2000 with ELD exp. (?)