Progress in Urban Model Development Keith Oleson, Gordon Bonan, Erik Kluzek, Mariana Vertenstein (CGD), Johannes Feddema, Trisha Jackson (University of.

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Presentation transcript:

Progress in Urban Model Development Keith Oleson, Gordon Bonan, Erik Kluzek, Mariana Vertenstein (CGD), Johannes Feddema, Trisha Jackson (University of Kansas), Sue Grimmond (Kings College London) Funding: WCIAS, CGD, WCAS, BGS, NSF ATM grants to KU

Provide climate and climate-change information (e.g., air temperature, humidity, surface hydrology, diurnal temperature range, extremes, etc.) for cities (where the majority of people live and work). What is the purpose of an urban model in CCSM?

Gridcell GlacierWetlandLake Landunits Columns PFTs UrbanVegetated Soil Type 1 Urbanizing CLM (CLMU)

Gridcell GlacierWetlandLake Landunits Columns/PFTs Vegetated PerviousShaded WallRoofSunlit WallImpervious Urban Canyon Floor HD MD LD TBD Density Classes

Atmospheric Forcing Urban Canyon Approach W Impervious Pervious H Roof Sunlit Wall Shaded Wall Canyon Floor Canopy Air Space

Average diurnal cycle of simulated and observed heat fluxes for the Mexico City site (Me93) for Dec 2-7, 1993 Oleson et al. (2008a) Simulated energy balance – Mexico City Key features Diurnal cycle is well represented Simulated net radiation is too high (model ignores pollution), which drives high sensible heat Negligible latent heat flux Large storage heat flux Observations from Oke et al. (1999)

Model description and performance for two cities: Oleson, K.W., G.B. Bonan, J. Feddema, M. Vertenstein, and C.S.B. Grimmond, 2008a: An urban parameterization for a global climate model. 1. Formulation and evaluation for two cities, J. Appl. Meteorol. Clim., 47, Sensitivity to parameters and characteristics of the simulated heat island: Oleson, K.W., G.B. Bonan, J. Feddema, and M. Vertenstein, 2008b: An urban parameterization for a global climate model. 2. Sensitivity to input parameters and the simulated urban heat island in offline simulations, J. Appl. Meteorol. Clim., 47, More Information on CLMU

CLMU – Current Status Runs globally within CLM (pre-CLM4 science branch tag), thanks to Eric Kluzek. Global urban datasets from KU (J. Feddema, T. Jackson) now being evaluated.

Model input requirements Fractional area of city Urban Morphology Building height Height to width ratio of canyon Roof fraction Vegetated (pervious) fraction Thermal/radiative properties of building materials Emissivity Albedo Thermal conductivity and heat capacity

Global Urban Datasets Urban ClassH/WBuilding Heights (m) Vegetative Fraction (%) Population Density (km2) Typical Building Types Tall Building District (TBD) ,000 – 134,000+ Skyscrapers High Density (HD) Residential/ Commerical/ Industrial ,000 – 80,000+ Tall apartments, office bldgs, industry Medium Density (MD) Residential ,000 – 7, story apartment bldgs, row houses Low Density (LD) Residential – 2,000Wood frame or corrugated metal homes T. Jackson 2007

Urban Fraction at 0.5º

Exploratory Global Simulations Objectives Verify CLMU can operate with spatially explicit urban fraction and TBD, HD, MD, and LD parameter sets Explore differences between parameter sets. Explore effects of averaging (i.e., a single urban landunit with parameters averaged over density classes). Methods Combine TBD, HD, MD, and LD urban fractions into total urban fraction Simulation with same city everywhere (Vancouver parameters) Simulation with each parameter set, including average (AVG) Prescribed atmosphere (Qian et al. 2006), FV1.9x2.5, no anthropogenic heat fluxes

Urban Effects on Grid-Averaged Variables Annual Average

Urban Effects on Grid-Averaged Variables Annual Average

Urban Minus Rural (AVG Parameters) 2m Air TemperatureSurface Temperature “Rural” is average over non-urban pfts within gridcell, excluding lake, wetland, glacier

Urban Minus Rural (AVG Parameters) 2m Specific HumidityRunoff “Rural” is average over non-urban pfts within gridcell, excluding lake, wetland, glacier

Heat Island (AVG Parameters) Maximum Annual Heat IslandDaily Average of Maximum Heat Island

Tasks Continue to investigate CLMU behavior with global datasets How many urban landunits? Recommend one for now using averaged parameters. Conversion of urban input datasets into standard CLM dataset format with ability to be aggregated to any resolution Modify surface data creation so that urban replaces bare soil preferentially Coupled simulations Further evaluation with observed data