Update on CAM2.X Development
and Future Research Directions

Outline

Principal CAM2/CCSM2 Biases

CAM 2.X Physics Changes Relative to CAM2

Examples of Simulation Improvements:

Examples of Simulation Improvements:

Examples of Simulation Improvements:

Notable Simulation Changes:

High-resolution configurations

T85 Zonal Annual Mean Temperatures

T85 vs T42 Cloud Forcing

T85 Surface Wind Stress

Current Assessment of High-Resolution Coupled Simulation (oceanographer’s perspective)

Future Directions

"Extensions to modeling capabilities"

"Extensions to modeling capabilities"

"Where would we like to..."

"Where would we like to..."

Summary

Slide 20

Other Notable Simulation Features:

Extension to Include Convective Cloud Fraction

Other Notable Simulation Features:

Slide 24

Example of extensions to cloud scheme

Convective Cloud Fraction

Convective Cloud Fraction

Convective Cloud Fraction

Second change motivated by problems with physics package at high resolution and in FV dynamical core

Standard Physics Tuning Implications

Deficiencies in extratropical cloud forcing fundamentally related to deficiencies in cloud fraction scheme (relative humidity clouds)

Provide additional source of cloud liquid water
from “shallow convection” process

Detrainment of cloud liquid water to prognostic clouds from shallow convection

Enhanced Physics Cloud Forcing (intermediate result)

Current Assessment of High-Resolution Coupled Simulation (oceanographer’s perspective)