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ORCHIDEE

ORCHIDEE. Physical Processes in Orchidée . Hydrological Cycle. Evapotranspiration and Sensible heat flux : Sechiba N. Ducoudré , 1993 (de Noblet ) Soil water flow and soil moisture content: P. de Rosnay (2002) Ground water flow and G roundwater : J. Polcher (2005).

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ORCHIDEE

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  1. ORCHIDEE PhysicalProcesses in Orchidée

  2. Hydrological Cycle • Evapotranspiration and Sensible heat flux : Sechiba N. Ducoudré, 1993 (de Noblet) • Soil water flow and soilmoisture content: P. de Rosnay (2002) • Ground water flow and Groundwater: J. Polcher (2005) Trenberth, 2007

  3. Sechiba: Evaporation • Impact of African and AmazonianDeforestation on climate: J. Polcher, 1994 • Comparison of Sechiba and Bats coupled to NCAR GCM: P. Peylin 1997 • Evapotranspiration: A. Barella-ortiz and T. d’Orgeval • Modelling of root water uptake: P. de Rosnay and J. Polcher (1998) The simulatedsoilmoistureis the most sensitive to water uptakeparameter. This has been underlined in a study by Matthieu Guimberteau (2012)

  4. Study over Illinois, M. Guimberteau, 2012 SoilMoisure Index Model forced by NLDAS dataset

  5. Soilmoisture content:2 layers I have introducedthis 2 layers Model during Hui Ding thesis (1989) Itsinterestwas to allowpotentialevapotranspirationafter a rain. You must keep the upper layer thinenough: Drainage betweenupper and lower layer (A. Ducharne, 1998) Influence of soil water holding capacity on water cycle (A. Ducharne, 2000)

  6. Irrigation, and flood plains(Sechiba+GWPolcher) • Irrigation P. de Rosnay, and flood plains T. d’Orgeval • Irrigation over Ganges bassin: delaysmonsoononset (M. Guimberteau, 2012) (S. Shukla, et al, 2013: irrigation has to beincluded to simulaterealisticallymonsoonsince 1960) Guimberteau, 2010

  7. Origin of the Warminghole? Irrigation fromOgallalaaquifer? De Angelis et al, 2010

  8. How to improvesoilmoisture simulations? We have to decrease the uncertainties on drought. PDSI index is not reliable. Mo et al, 2011: study over USA. • Twoexamples

  9. The role of resolution in the simulation of hydrological cycle over IberianPeninsula Sensitivity of the Hydro Cycle, Sylvie Vérant, 2004 Resolutionincreases interception decreases, evpaorationdoes not change. But the soilmoistureincreases

  10. Soilmoisture in GCM experiment: de Rosnay parameterization (2002) Comparisonbetween 2 versions of Soilmoisture Dependence on soil texture

  11. Groundwater flow : effect on sealevelheight (NgoDuc et al, 2005) Observation from Jason

  12. In the Future: The decrease of uncertainties • High resolution • Improve the prediction of agricultural drought. CESE: LA GESTION ET L’USAGEDE L’EAU EN AGRICULTURE: Mai, 2013 • Water Ressources (and sealevelheight): Konikov, 2011. • Include all anthropogenic changes

  13. The physicalprocesses must beimproved Relation withBoundary layer: Ek, M., and L. Mahrt, 1991: A formulation for boundary-layercloudcover. Ann. Geophys., 9, 716–724. Holtslag, and M. Ek, 1996: Simulation of surface fluxes and boundary layer development over the pine forest in HAPEX–MOBILHY.J. Appl. Meteor., 35, 202–213. Cheruy et al Recycling of land precipitation: Risi et al

  14. Thankyou

  15. Interaction between surface and ABL (Cheruy et al, 2013)

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