Discussion of Radiation

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Presentation transcript:

Discussion of Radiation Bill Collins UC Berkeley and LBL Acknowledgements: Mike Iacono (AER) and Andrew Conley (NCAR)

Requirements for new radiation? Advantages of new RRTM method: Modern optical properties of gases Traceability to line-by-line reference codes Extensibility to new radiative species / optics Extensibility to arbitrary cloud overlap Comprehensive validation against ARM data Accuracy? Our standard: > CAM radiation package Speed? Requirements?

Steps toward new radiation Development of new radiation Physics tests Climate tests Implementation

Physics Tests of RRTM versus reference calculations Comparison against community benchmarks Gases (Phase 1): GHGs: RTMIP H2O: RTMIP Ozone: TBD Condensed species (Phases 2 and 3): Aerosols: Necessary? Primarily a test of RT solver. Clouds: Necessary? Primarily a test of RT solver.

Climate tests of RRTM versus current CAM radiative code Tests with new scheme in interactive mode: Result: Large cloud radiative effect differences: why? Explanations under investigation: Differences in mapping water-vapor / cloud optics in near-IR Differences in cloud-column generators Differences in vertical cloud structure Tests with new scheme in diagnostic mode: Now underway, using column radiation model

Implementation Radiation interface -- well underway Initialization phase: done Run phase: mostly done, but Forcing calculations written but untested Microphysical parameter interface TBD Sharing of column generator with other physics TBD Finalize phase: mostly done, but Archival of radiation input fields for offline calculations TBD Namespace conflicts for diagnostic output to be solved

Radiation Package Cam or Offline Driver Cloud Subcolumn Generator Thermodynamic State, Cloud Fraction, Condensed Phase Concentrations, Condensed Microphysics, Gas Distributions, Solar Specification, Surface Radiative Characterization Heating Rates, Fluxes, Photolysis Yields Condensed Phase Optics Cloud Subcolumn Generator Radiative Props tau, ssa, g Subcolumns Radiative Transfer Solver Radiation Package

Open issue #1: Clouds Liquid-cloud optics: Ice-cloud optics: Target: Morrison-Gettelman microphysics Specs for calculation determined. Ice-cloud optics: Target: Mitchell cirrus AD optics

Open issue #2: Aerosols What are the target species? What are the target optics? Procedure for integration with RRTM?