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AMWG Breakout, CCSM Workshop June 25, 2002 Overview of CAM status and simulations Bill Collins and Dave Randall National Center for Atmospheric Research.

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Presentation on theme: "AMWG Breakout, CCSM Workshop June 25, 2002 Overview of CAM status and simulations Bill Collins and Dave Randall National Center for Atmospheric Research."— Presentation transcript:

1 AMWG Breakout, CCSM Workshop June 25, 2002 Overview of CAM status and simulations Bill Collins and Dave Randall National Center for Atmospheric Research and Colorado State University Breakout agenda & topics Model status, simulations, & release Features of model simulations

2 AMWG Breakout, CCSM Workshop June 25, 2002 Topics Introduction: –Status of CAM release and model datasets –Discussion from April ’02 AMWG workshop –Overview of features in CAM simulations –Future directions for AMWG New methods for diagnosing CAM Analysis of systematic errors in coupled and uncoupled simulations Ongoing development of new physics

3 AMWG Breakout, CCSM Workshop June 25, 2002 11:00 AM 11:30 AMCollinsOverview of CAM Status & Simulations 11:30 AM11:50 AMWilliamsonCAM2 in the NWP Mode for Development 11:50 AM1:15 PMLUNCH 1:15 PM1:30 PMBrethertonE. Pacific CAM Simulation vs. Observations 1:30 PM1:45 PMKiehlComparison of Cloud Response to SST Anomalies 1:45 PM2:00 PMBovilleAnalysis of Tropopause Temperature Bias 2:00 PM2:15 PMBrieglebCCSM2 Polar Atmosphere Simulation 2:15 PM2:30 PMDonnerResults on Donner Cumulus Parameterization 2:30 PM2:45 PMSassiEarly WACCM Results with Interactive Chemistry 2:45 PM3:00 PMDuffyClimate Simulations with High-Res. Global Model 3:00 PM3:15 PMWuEffects of CRM-Validated Parameterizations 3:15 PM3:30 PMDISCUSSION Agenda

4 AMWG Breakout, CCSM Workshop June 25, 2002 New Features of CAM 2.0 Dynamics: Addition of Finite Volume dynamical core Process-split or time-split coupling between dynamics & physics Physics: Thermodynamic sea ice Fractional ice and land Updated prognostic cloud water Generalized cloud overlap in radiation More accurate formulation of H 2 O absorptivity/emissivity Evaporation of precipitation Boundary Conditions: Blended SST and sea-ice data set for 1949-2001

5 AMWG Breakout, CCSM Workshop June 25, 2002 CAM 2.0 and CCSM 2.0 were released May 17, 2002 http://www.ccsm.ucar.edu/models/atm-cam/ Contents of release: –Model component source code; build and run scripts Eulerian –Three dynamical cores: Eulerian, semi-Lagrange, and Finite Volume –Web-based documentation User’s Guide (how to run the model) TBD: Reference Guide (details of the code structure) TBD: Scientific Guide (description of physics & dynamics) –Initial and boundary data sets New SST and sea-ice concentration data TBD: Release of tools for interpolation to other resolutions –Model data sets and data set diagnostics: AMIP-2 & climatological SST uncoupled integrations (Eulerian) CAM output from CCSM control integration (years 350-670) Release of CAM2 to Community

6 AMWG Breakout, CCSM Workshop June 25, 2002 Supported platforms now include: –Compaq –IBM-SP –Linux: Portland group and Lahey compilers –SGI –Sun Additional CAM documentation coming shortly. Updates to Release

7 AMWG Breakout, CCSM Workshop June 25, 2002 Documentation of CAM2 Formulation and Principal Simulation Features Peer-reviewed journal article is planned for early summer documentation of new parametric and numerical formulations documentation of principal simulation features documentation of simulation sensitivities –limited scope for the purposes of this manuscript  Abbreviated version of documentation effort completed for CCM3  “Developers” will be contacted electronically for participation shortly after the CCSM Workshop

8 AMWG Breakout, CCSM Workshop June 25, 2002 Main systematic errors discussed: –Double ITCZ (Simulating the Coupled Tropical Climate System) –Underestimation of tropical variability on short&MJO scales (CVWG) –Overestimation of land surface temperatures in winter –Underestimation of tropical tropopause temperatures –Biases in the eastern Pacific: BL clouds, surface fields Steps necessary to analyze these problems: –Experimentation of alternative physics formulations (coupled and uncoupled testing) –“Partial derivative experiments” –Column diagnostics from field experiments, buoys, etc. April 2002 AMWG Meeting Main systematic errors discussed: –Double ITCZ –Underestimation of tropical variability on short&MJO scales –Overestimation of land surface temperatures in winter –Underestimation of tropical tropopause temperatures –Biases in the eastern Pacific: BL clouds, surface fields Steps necessary to analyze these problems: –Experimentation of alternative physics formulations (coupled and uncoupled testing) –“Partial derivative experiments” –Column diagnostics from field experiments, buoys, etc.

9 AMWG Breakout, CCSM Workshop June 25, 2002 April 2002 AMWG Meeting (cont). Recommendation to adopt FV for future development: –Diagnosis of model using results from the DAO assimilation/forecast system built upon CAM2 –Testing of isentropic coordinates –Superiority for applications involving chemistry & tracer transport –Compatibility with WACCM development effort –Superior computational performance on massively parallel systems relative to standard Eulerian dycore Recommendation to explore higher vertical and horizontal resolutions

10 AMWG Breakout, CCSM Workshop June 25, 2002 Change in AMWG Leadership Current co-chair: Dave Randall New co-chair: Leo Donner

11 AMWG Breakout, CCSM Workshop June 25, 2002 Precipitable Water CCM3CAM2-CCM3 CGD: Improvements CGD: Improvements

12 AMWG Breakout, CCSM Workshop June 25, 2002 Longwave Surface Fluxes Clear:CAM2- CCM3All-sky:CAM2-CCM3

13 AMWG Breakout, CCSM Workshop June 25, 2002 Clear-Sky Longwave TOA Fluxes CAM2- CCM3CAM2

14 AMWG Breakout, CCSM Workshop June 25, 2002 Relationship of SWCF and LWCF in Pacific

15 AMWG Breakout, CCSM Workshop June 25, 2002 Land Surface Temperatures,CCSM2 & CAM2 CCSM2CAM2 CGD: Systematic errors CGD: Systematic errors

16 AMWG Breakout, CCSM Workshop June 25, 2002 Land Surface Temperatures, Differences CCSM2-CSM1CAM2-CCM3

17 AMWG Breakout, CCSM Workshop June 25, 2002 Tropopause Temperatures, CCSM2 & CAM2 CCSM2CAM2

18 AMWG Breakout, CCSM Workshop June 25, 2002 Tropopause Temperatures, Differences CCSM2-CSM1CAM2-CCM3

19 AMWG Breakout, CCSM Workshop June 25, 2002 Tropical Precipitation, CCSM2 & CAM2 CCSM2CAM2

20 AMWG Breakout, CCSM Workshop June 25, 2002 Tropical Precipitation, Differences CCSM2-CSM1CAM2-CCM3

21 AMWG Breakout, CCSM Workshop June 25, 2002 Eastern Pacific SSTs CCSM2CCSM2-CSM1

22 AMWG Breakout, CCSM Workshop June 25, 2002 Eastern Pacific Surface State CCSM2-CSM1CCSM2

23 AMWG Breakout, CCSM Workshop June 25, 2002 AMWG Directions, Near Term Climate applications of CCSM impeded by: –Double ITCZ and extended cold tongue –Underestimation of tropical variability on short&MJO scales –Overestimation of land surface temperatures in winter –Underestimation of tropical tropopause temperatures –Biases in the eastern Pacific: BL clouds, surface fields The AMWG must focus on analyzing and addressing these errors (where possible), in collaboration with other working groups, as the highest priority. Immediate task: develop experimental strategies: –Alternative physics formulations –“Partial derivative experiments”

24 AMWG Breakout, CCSM Workshop June 25, 2002 AMWG Directions, Longer Term Physics: Incorporation of major aerosol species New radiation parameterizations Alternative formulations of convective processes and transport New formulations for boundary layer structure and cloud systems Incorporation of simplified tropospheric chemistry Creation of unified parameterizations for boundary layer clouds, cloud/radiation interactions Diagnostics: New frameworks for testing: o Assimilation/forecasting (DAO) o Initial error growth (CAGATE) Addition of EOS data, variability Dynamics: Exploration of new dycores (FV) Exploration of isentropic coordinates

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