J.T. Kiehl National Center for Atmospheric Research

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Presentation transcript:

J.T. Kiehl National Center for Atmospheric Research On the Road to CCSM2 Part 1 J.T. Kiehl National Center for Atmospheric Research

Outline Atmospheric Component for CCSM2 Land Component for CCSM2 Climate Change Experiments Improvements for CCSM2

Atmospheric Component for CCSM2 Improved Water Vapor Longwave Model Generalized Cloud Overlap Scheme 26 Vertical Levels Prognostic Cloud Water Scheme Modification to Deep Convection Scheme Topographic Filter

Improvements in Atmospheric Simulation Improved Tropical Precipitation Patterns Improved JJA Tropical Wind Stress Improved Tropical Upper Troposphere Winds Improved Stratus Cloud Formation Improved Water Vapor Distribution

Collins (2001)

Land Component for CCSM2 Biogeophysics Hydrology Catchment Hydrology and River Flow

Community Land Model version 2 Biogeophysics Hydrology Latent Heat Flux Sensible Heat Flux Photosynthesis ua Momentum Flux Wind Speed Precipitation Diffuse Solar Radiation Longwave Radiation Evaporation Interception Canopy Water Direct Solar Radiation Transpiration Reflected Solar Radiation Emitted Long- wave Radiation Throughfall Stemflow Absorbed Solar Radiation Sublimation Evaporation Infiltration Surface Runoff Melt Snow Soil Heat Flux Soil Water Heat Transfer Redistribution Drainage Merging of BATS, IAP94, NCAR LSM 10-layer soil to depth of 3.5 m with ice and liquid water contents Canopy physiology with photosynthesis and transpiration from sunlit and shaded leaves Root depth distributions based on global ecological synthesis TOPMODEL-like runoff from upland hillslopes and saturated lowlands Multi-layer snowpack with compaction and re-freezing Sub-grid mosaic of plant functional types Snow Catchment Hydrology And River Flow Soil Water Global ½º river flow network Called every 3 hours River flow balances water Surface Runoff Ground Water Lake Ocean

Climate Change Research Simulation of the 20th Century (Natural Forcings) Ensemble Climate Change Simulations

Ammann et al. 2001

Ammann et al. (2001)

Dai et al. (2001)

Development Issues for CCSM2 Cloud Liquid Water Path over Sea Ice Dynamical Core Effects on Polar Region Double ITCZ in Coupled Model

Holland (2001)

Lin-Rood