INM’s contribution to
ELDAS project
E. Rodríguez and
B. Navascués
INM
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Outline
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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.)
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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)
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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
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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, we’ll 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
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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)
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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
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HIRLAM surface scheme.
Topics for discussion on
ECOCLIMAP database
(Masson et al., 2003) (II)
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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. (?)
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