Title:	S-CMIP: Swedish climate research and contributions to the sixth International Coupled Model Intercomparison Project (CMIP6)
DNr:	SNIC 2014/11-5
Project Type:	SNIC Large Compute
Principal Investigator:	Gunilla Svensson <gunilla@misu.su.se>
Affiliation:	Stockholms universitet
Duration:	2015-01-01 – 2016-01-01
Classification:	10501 10508 10599
Homepage:	http://www.wcrp-climate.org/index.php/wgcm-cmip/wgcm-cmip6
Keywords:

Abstract

Since 1995, the Coupled Model Intercomparison Project (CMIP) has internationally coordinated climate model experiments on behalf of World Climate Research Programme (WCRP). By documenting, analyzing and comparing, insights are gained into climate processes, variability and climate change. In this proposal, the Swedish community of Earth System Modeling, with members from Stockholm, Lund, Gothenburg and Uppsala Universities together with SMHI, is asking for computational resources for climate science and earth system projects related to the sixth phase of CMIP (CMIP6) and to ongoing research projects leading to improved capabilities in CMIP6. CMIP6 will start in 2015 and end not before 2020. CMIP generates a wealth of scientific value and also provides the basis for assessment of regional and local climate by downscaling of the global scale information to finer scale. The recent COordinated Regional climate Downscaling Experiment (CORDEX) is the primary example for regional downscaling of CMIP information. The combined results of CMIP lead to improved decision support, and allow for informed measures targeting climate change mitigation and adaptation. The primary tool of S-CMIP is the EC-Earth model. It is a state-of-the-art Earth System Model (ESM), developed and used by a consortium of European Met Services, research institutes and universities from 12 European countries. S-CMIP aims at a consolidation of the development of the EC-Earth model, and studies concerning climate processes, climate prediction, climate sensitivity, climate projection and consequences of a warmer global climate, all of those preparing for, or being part of, the international CMIP6 effort. Other models than EC-Earth will also be utilized for specific studies on global-, regional- and process-scales. In particular, S-CMIP proposes computations in 7 science areas: 1) Process studies and model improvement 2) CMIP6 coupling and tuning simulations 3) CMIP6 DECK 4) CMIP6 MIPs 5) Climate prediction and predictability 6) Consequences of higher-end warming scenarios 7) Near-term climate projections For those climate simulation projects preparing for CMIP6, and for the actual CMIP6, we estimate an overall amount of 340 mio core-hours (estimates based on Triolith units) over a period of 5 years (2015-2019). As multi-year allocations are presently not possible in SNIC, we propose an allocation of 40 mio core-h for 2015 and suggest to provide updated allocations for the remaining period every year. The proposed allocation is suggested to be coordinated by a management group with the task to plan and monitor the usage of computing resources and storage within S-CMIP and to propose allocations for the forthcoming project year to SNAC. Climate simulations of the proposed type generate substantial amounts of data, which needs to to be stored, processed and published for the international science community. Those tasks require a data infrastructure, which resides on elements, such as large accessible disks, which exist at NSC. Therefore, an appropriate link between the compute nodes and the data infrastructure needs to be established during the first year of the project.