c CAM3 and AM2 diagnostics
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Cecile Hannay

CAM3 and AM2 diagnostics

CAM3 and AM2 diagnostics



Motivation

Change in Pacific low-levels clouds for 2xCO2 scenario: CAM3 and AM2 show different response.
Our goal: What determines cloud properties in various regions of the Pacific for the present day climate ?




Datasets and Regions


We look at a 12-month climatology of AMIP runs (i.e. the models are forced with observed monthly mean SST and sea ice which change with time/years.)
  • CAM3
  • datasets , Years: 1979-99 , Resolution: T85
  • AM2
  • datasets , Years: 1983-98 , Resolution: 2x2.5
  • Observations
  • datasets


    We look at regions of subsidence with significant amount of low-level clouds.
    We pick 3 regions based on observations: North SubTropics, South SubTropics, and East equatorial.



    The idea is to :
  • Characterize cloud properties in these regions.
  • Which large-scale quantities determine cloud properties ?


    Contour plots - AM2, CAM3 and observations


    CLDLOW
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    Warren DJF MAM JJA SON ANN

    ISCCP CLDLOW
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    ISCCP DJF MAM JJA SON ANN

    SWCF
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    ERBE DJF MAM JJA SON ANN

    LWCF
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    ERBE DJF MAM JJA SON ANN

    LWP
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    SSMI DJF MAM JJA SON ANN

    OMEGA500
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    NCEP DJF MAM JJA SON ANN

    RHMEAN
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    NCEP DJF MAM JJA SON ANN

    STATIC STABILITY
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    NCEP DJF MAM JJA SON ANN

    LHFLX
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    NCEP DJF MAM JJA SON ANN

    TS
    CAM3 DJF MAM JJA SON ANN
    AM2 DJF MAM JJA SON ANN
    NCEP DJF MAM JJA SON ANN


    Seasonal PDF - AM2, CAM3 versus observations

    SWCF DJF MAM JJA SON ANN
    CLDLOW DJF MAM JJA SON ANN
    ISCCP CLDLOW DJF MAM JJA SON ANN
    LWP DJF MAM JJA SON ANN
    OMEGA500 DJF MAM JJA SON ANN
    STABILITY DJF MAM JJA SON ANN
    RHMEAN (sfc to 700mb) DJF MAM JJA SON ANN



    Correlation tables

    North Subtropics DJF JJA MAM SON ANN
    East Equatorial DJF JJA MAM SON ANN
    South SubTropics DJF JJA MAM SON ANN



    Scatter plots and joint PDFs

    North Subtropics DJF MAM JJA SON ANN
    East Equatorial DJF MAM JJA SON ANN
    South Subtropics DJF MAM JJA SON ANN