Study may answer longstanding questions about Little Ice Age. The study, which used analyses of patterns of dead vegetation, ice and sediment core data, and powerful computer climate models, provides new evidence in a longstanding scientific debate over the onset of the Little Ice Age. [highlight]
Ozone recovery and greenhouse gases in the Southern Hemisphere. A new study in Geophysical Research Letters looks at how the anticipated recovery of the ozone hole over Antarctica and simultaneous increase in greenhouse gas concentrations will combine to affect weather and climate in the Southern Hemisphere. It concludes that over the coming half century, ozone recovery will result in a nearly complete cancellation of the effects of increased greenhouse gases on atmospheric circulation. [highlight]
Special collections of the Journal of Climate describe numerous aspects of the fourth version of the Community Climate System Model (CCSM4) and the Community Earth System Model (CESM1) are being prepared. [Early on-line release of accepted manuscripts]
Climate change projections in CESM1(CAM5) compared to CCSM4. Future climate change projections for the Coupled Model Intercomparison Project phase 5 (CMIP5) are presented for the Community Earth System Model version 1 that includes the Community Atmospheric Model version 5 (CESM1(CAM5)). These results are compared to CCSM4 and include simulations using the Representative Concentration Pathway (RCP) mitigation scenarios, and extensions for those scenarios beyond 2100 to 2300. [article]
Spatial Decomposition of Climate Feedbacks in the Community Earth System Model. An ensemble of simulations from different versions of the Community Atmosphere Model (CAM) in the Community Earth System Model (CESM) is used to investigate the processes responsible for the inter-model spread in climate sensitivity. In the CESM simulations, the climate sensitivity spread is primarily explained by shortwave cloud feedbacks on the equator-ward flank of the mid-latitude storm tracks. [article]
The Community Earth System Model (CESM) is a fully-coupled, global climate model that provides state-of-the-art computer simulations of the Earth's past, present, and future climate states.
CESM Distinguished Achievement
William Lipscomb is the recipient of the 2012 CESM Distinguished Achievement Award. [more]