American Geophysical Union Meeting, May 22-25, 2007 1 CNRS, Centre National de Recherches Météorologiques (CNRM / Météo- France, Toulouse) 2 CNRS, Centre d’Etudes de la BIOsphere (CESBIO, Toulouse, France) Aaron Boone 1 , Patricia deRosnay 2 , and the ALMIP Working Group AMMA Land surface Model Intercomparison Project
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American Geophysical Union Meeting, May 22-25, 2007 1 CNRS, Centre National de Recherches Météorologiques (CNRM / Météo-France, Toulouse) 2 CNRS, Centre.
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American Geophysical Union Meeting, May 22-25, 2007
1 CNRS, Centre National de Recherches Météorologiques (CNRM / Météo-France, Toulouse)
2 CNRS, Centre d’Etudes de la BIOsphere (CESBIO, Toulouse, France)
Aaron Boone1, Patricia deRosnay2, and the ALMIP Working Group
AMMA Land surface Model Intercomparison Project
American Geophysical Union Meeting, May 22-25, 2007
Goal: Obtain a better understanding of the West African
Monsoon (WAM) on daily to inter-annual timescales. AMMA relies on:
i) the use of extensive observations, notably multi-
sensor remote sensing products, ii) a multi-year field campaign over west Africa, and iii) a coordinated modeling strategy at different spatial
and temporal scales.
AMMA = African Monsoon Multidisciplinary Analysis
* See the AMMA Special Issue of GEWEX News, Feb., 2006
American Geophysical Union Meeting, May 22-25, 2007
Importance of the Continental Land surface to the WAM
Surface processes which
influence the atmosphere
and hydrology:
• Significant Meridional
Gradients:
- vegetation
- soil moisture
• Large spatial variability:
- surface runoff, infiltration, flooded areas
- surface fluxes
American Geophysical Union Meeting, May 22-25, 2007
ALMIP Science Questions:
• No one scheme perfect: examine ensemble of models (currently 12): Response of different schemes to scale change
• Develop a mult-model climatology of « realistic » high resolution soil moisture, surface fluxes, water and energy budget
• See what improvements needed in SVATs to simulate processes particular to African climate and surface
• Examine how simple SVATs can simulate spatial distribution and inter-annual variability of vegetation
Break various components of complex coupled system into managable portions which can then provide insight into various processes: 1st step Force LSMs in Offline mode
GSWP
SnowMIP
American Geophysical Union Meeting, May 22-25, 2007
ORCHIDEE LMD, Paris, France J. Polcher, T. Orgeval
ISBA CNRM / Météo France Toulouse A. Boone
TESSEL ECMWF, Reading, UK A. Beljaars, G. Balsamo
JULES CEH, Wallingford, UK C. Taylor, P. Harris
SETHYS CETP, France C. Ottlé, B. Decharme
CaB UPMC, France A. Ducharne, S. Gascoin
IBIS ISE, Monpellier, France C. Delire
SSib U. Nantes, France, UCLA, USA I. Poccard-Leclercq, Y. Xue
MIKE-SHE U. Copenhagen, Denmark A. Norgaard, I. Sandholt
CLM NCAR, Boulder, CO, USA B. Lamptey
SWAP Inst. Of Water Problems, Moscow, Russia
Y. Gusev, O. Nasonova
NOAH (NCEP, USA) CETP, France C. Ottlé, B. Decharme
Model acronym Institute Contact
American Geophysical Union Meeting, May 22-25, 2007
Precipitation (mm day-1) 2004 ECOCLIMAP LAI (m2 m-2) month
Land Surface Model Soil-Vegetation Parameters
• ECOCLIMAP – global 1x1 km2, decadal
• Operatioal NWP, Mesoscale research
• Large annual variability (« mirrors » rainfall)
• Single annual cycle
American Geophysical Union Meeting, May 22-25, 2007
ECMWF Forecast Product:
• Lowest model level atmospheric variables Tair, Qair, Wind, PSurf
• 50 to 100% increase in Sahel: region with possibly largest atmospheric feedback
American Geophysical Union Meeting, May 22-25, 2007
Meridional gradient of Evap:
• Exp 2 vs Exp 1
• Northward shift by several 100 kms
• Implications for NWP model initialization (e.g. ECMWF)
Exp2 2004: Large inter-model scatter quantity atmopshere « feels »
American Geophysical Union Meeting, May 22-25, 2007
Exp2 JJAS 2004 All-SVATs
Dominant land class:
Coefficient of Variation:
Inter-model scatter
Large in Sahel water stress, low average Evap (where coupling is important ?)
Large in Forested regions Canopy Interception differences important
Product USERS give some estimate of inter-model variability
American Geophysical Union Meeting, May 22-25, 2007
• Exp2 2004 JJAS Multi-Model AVG
• Water budget terms (mm day-1)
DelSoilMoist
Runoff
Evap
Rainf
American Geophysical Union Meeting, May 22-25, 2007
DelSoilMoist/Rainf
Runoff/Rainf
Evap/Rainf
Rainf
• Exp2 2004 JJAS Multi-Model AVG
• Water budget terms (mm day-1)
American Geophysical Union Meeting, May 22-25, 2007
09/84
09/87
09/86
09/00
09/92
09/89Gourma, Mali
• September
• Significant inter-annual vegetation variability
• Can LSMs model this?
* Photos courtesy of CESBIO
American Geophysical Union Meeting, May 22-25, 2007
Vegetation/Soil Parameters
Atmospheric Forcing
ISBA-Ags
Biomass (LAI)
Turbulent and Radiative fluxes (CO2)
Runoff Irrigation
Interactive mode
Pashtuchak, Peyrillé, Plante, and Boone
Rivers, Lakes… Ocean/Sea
Inputs: Outputs:
American Geophysical Union Meeting, May 22-25, 2007
Vegetation/Soil Parameters
Atmospheric Forcing
ISBA-Ags
Biomass (LAI)
Turbulent and Radiative fluxes (CO2)
Runoff Irrigation
Interactive mode
Peyrillé and Boone
Rivers, Lakes… Ocean/Sea
Coupled (atmosphere) mode
American Geophysical Union Meeting, May 22-25, 2007
Exp 1 Exp 2
• Correlations between 0.8 and 1.0 over a large part of Sahel (where vegetation signal strongest)
• Exp2 (satellite-based) precipitation improved LAI prediction (and enhanced Evap)
But…
• Montly LAI misses rapid greenup
• Forest regions: MODIS quality questionable AND ISBA-Ags needs work!
• Care must be taken in fully coupled mode!
American Geophysical Union Meeting, May 22-25, 2007
• ALMIP ongoing: 2006 Forcing to be released and runs using updated forcing (new EPSAT algorithm) to be submitted this summer (Exp2b)
• Complete regional merged and mesoscale atmospheric forcing data (2004): extend through 2006
• Regional scale evaluation data (forcing and for simulations) comparison with AMSR-E, ALMIP-MEB, TRIP 0.5 deg, GRACE…
• 2007-8 Mesoscale Forcing Evaluation of processes using SOP, EOP data
• 1st step towards ALDAS
• Collaboration with WAMME (Lau, Xue), AMMA-CROSS (Guichard, Hourdin, et al)
Parallel actions at CNRM:
• Simulate land surface fluxes, soil moisture, vegetation at various scales
• Compare simulated soil moisture to ARPEGE/assimilation
• NWP/Mesoscale model initialization: CNRM
Perspectives:
American Geophysical Union Meeting, May 22-25, 2007
Thank you for Your attention…
By M. Nuret, Dakar, Senegal
And to the ALMIP Working Group:Anton Beljaars, ECMWF
Aaron Boone, CNRM
Jan Polcher, LMD
Chris Taylor, CEH
Phil Harris, CEH
Inge Sandholt, U. Copenhagen
Anette Norgaard, U. Copenhagen
Patricia deRosnay, CESBIO
Eric Mougin, CESBIO
Laurent Kergoat, CESBIO
Agnes Ducharne, UTMC
Tristan Orgeval, LMD
Yonkang Xue, UCLA
Isabelle Poccard-Leclercq, U. Nantes
Christine Delire, ISE
Bertrand Decharme, CETP
Catherine Ottle, CETP
American Geophysical Union Meeting, May 22-25, 2007
American Geophysical Union Meeting, May 22-25, 2007
EXTRA….
American Geophysical Union Meeting, May 22-25, 2007
2 Database
Land Parameters: ECOCLIMAP
• Single annual cycle (decad)
• 12 classes 255 types
• Effective or multi-tile schemes
• 1 km, global
Applications:
• used at Météo-France
• to be used at ECMWF
(0.5 deg.)
American Geophysical Union Meeting, May 22-25, 2007
• Determination of baseline or « minimum » physics (eg. Stomatal resistance)• Importance of sub-grid hydrology• Importance of soil moisture (on surface energy balance: HAPEX MOBILHY)• Better numerical schemes• Chance for extensive validation• Ability of schemes to simulate carbon cycle • Innovations in Sub-grid cold-season processes• Impact of changing scale• Ability of such models to simulate regional / large scale hydrology
American Geophysical Union Meeting, May 22-25, 2007
2 Database
Atmospheric Forcing:
Data for running an LSM in « offline » mode
Spatial scales for the atmospheric forcing datasets
American Geophysical Union Meeting, May 22-25, 2007
2 Database
ECOCLIMAP Soil, vegetation 1 km 0.5 deg (monthly climatology)
• Extend vegetation processes to the regional scale
• Use a multi-scale approach
• Develop a surface flux and soil moisture « climatology » used to study coupling
with atmosphere, improve assimilation systems…
• Intercomparison Project (ALMIP) over region (CESBIO and CNRM)
American Geophysical Union Meeting, May 22-25, 2007
Equation 2
EPSAT-SG(Estimation des Pluies par SATellite – Seconde Génération)
AT
r
AT
gpcp
ApdadttaP
dadttaI
dcI22
11
,
,
,
Equation 1
Neural NetworkMSG Channels
SRTM Digital Elevation Model
Rainfall probability images (Pr) GPCP1dd rainfall images (Igpcp)
Potential rainfall intensity images (Ip)
EPSAT-SG rainfall estimation (Ie)
A is a disc of about 125kms radiuscA is the centre of Ad is the considered dayT is the period [d-15days,d+15days]dt1 corresponds to 1 daydt2 corresponds to 15 minuteda corresponds to 1 MSG pixel
Equation 1
daItaPtaI pre ,,,
Equation 2Estimated Rainfall Intensity at time t during day d and position a:
Final product resolutions:Space resolution : 3 kms
Time resolution : 15 minutes
2A25 TRMM precipitationRadar data
American Geophysical Union Meeting, May 22-25, 2007
ECMWF Forecast Precipitation: Hovmoller plots
American Geophysical Union Meeting, May 22-25, 2007
GSWP
• 15 LSSs, 1 deg. res.
• Evap (average 10 years, -20E to 30 E longitude)
• Inter-LSS Meridional gradient highly variable
3 ALMIP description
American Geophysical Union Meeting, May 22-25, 2007