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Development and integration of high-latitude version of ORCHIDEE

This project focuses on developing a version of ORCHIDEE for high-latitude regions, emphasizing soil freezing, multilayer snow, permafrost carbon dynamics, and wetland processes for improved climate feedback and methane flux modeling. Ongoing work includes assessing climate feedback uncertainty, wetland methane variability, and thermokarst module development in ORCHIDEE.

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Development and integration of high-latitude version of ORCHIDEE

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  1. Development and integration of high-latitude version of ORCHIDEE Tao Wang, Shushi Peng, Philippe Ciais, Gerhard Krinner

  2. Evolution of high-latitude ORCHIDEEversion Trunk MICT V1 MICT V2 MICT V3 MICT V4 Soil freezing Soil freezing Soil freezing Soil freezing Multilayer snow Multilayer snow Multilayer snow Permafrost Carbon Permafrost Carbon Wetland LMDz

  3. Soil freezing/thawing New feature Old feature Gouttevin et al. (2012)

  4. Soil freezing/thawing improves the runoff, soil temperature ... Gouttevin et al. (2012)

  5. Snow often not well represented in climate models Koven et al. (2013)

  6. Snow module Old feature (1-layer) New Feature (3-layers) Heat Water Heat Water Kin Lin H LE Kin Lin En Qp P En H LE P Tsurf Skin layer J J1 K1 Q1, T1, D1, ρ1 P1 Ws1, Wl1, D1, ρ1 Q2, T2, D2, ρ2 Ws2, Wl2, D2, ρ2 J2 Tsurf > 0, snow melt occurs; K2 P2 Ws, D, ρ T, D, ρ Q3, T3, D3, ρ3 Ws3, Wl3, D3, ρ3 J3 K3 P3 Separate Separate composite composite Top soil layer Top soil layer Top soil layer Top soil layer Modified from ISBA-ES (Boone et al., 2004) Kin (short wave radiation), Lin (longwave radiation), H (sensible heat flux), LE(latent heat flux), J (conduction heat flux), Ws (Snow layer water equivalent ), Wl(Snow layer liquid water content),D (snow depth), ρ (snow density, constant in ORC-O) , P (precipitation), En (evaporation), T(snow temperature), Tsurf (skin layer temperature), Q (snow layer heat content), Qp(advective heat from rain and snow) 22/32

  7. Multi-layer snow significantly improves SWE, soil temperature

  8. Vertical Permafrost carbon representation + deep permafrost carbon (i.e. Yedoma) Old Feature (bulk vertically intergrated) New Feature (fully vertically discretized) Cryoturbation Permafrost Freeze Permafrost carbon over yedoma cells Koven et al. (2011)

  9. Vertical Permafrost carbon representation improves SOC simulation Koven et al. (2009)

  10. <30N 30N-50N >50N Wetland methane flux Wetland total CH4 flux = CH4 flux density from ORCHIDEE × wetland extent from satellites 22/32

  11. Ongoing work • What is the magnitude of climate feedback from high-latitude permafrost carbon in the future? Uncertainty? 2. Which factors drive inter-annual variability of wetland methane flux? 3. Thermokarst module development in ORCHIDEE? 22/32

  12. Thanks a lot for your attention!

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