Community Simulations of the last Millennium
|Research Area||Earth System Science|
|Principal Investigator(s)||Johann Jungclaus|
Knowledge of past climate variability is crucial for understanding current and future climate trends. For the first time, sufficient computational resources are available to carry out millennial-scale simulations with a comprehensive Earth System Model. Within the Community Earth System Modelling (http://cosmos.enes.org) initiative, a community effort has been initiated to carry out such simulations using the COSMOS model.
Climate history requires that these experiments are started in the year 800 and run until the year 2000. To discriminate between internal variability, natural external forcing (orbital, solar, volcanic), and the anthropogenic-induced greenhouse-gas forcing, it is necessary to carry out an ensemble of several (min. three) 1200-year long integrations with a relatively high-resolution Earth System model using high-end HPC facilities. The PRISM environment will be used extensively to conduct and manage the computationally demanding simulations and the data transfer and storage tasks.
Performing millennia-long integrations in ensemble mode is still a challenge, both in terms of required computing time, data transfer systems, and storage capacities. Innovative infrastructure and sophisticated environments, such as offered by DEISA, is necessary to perform and manage such a project.