Title:	Simulations with earth system model EC-Earth
DNr:	SNIC 2014/1-373
Project Type:	SNIC Medium Compute
Principal Investigator:	Qiong Zhang <qiong.zhang@natgeo.su.se>
Affiliation:	Stockholms universitet
Duration:	2015-01-01 – 2016-01-01
Classification:	10501 10508 10509
Homepage:	http://www.bolin.su.se/
Keywords:

Abstract

In 2014 we have made progresses in running paleo-simulations with EC-Earth. We have implemented two important physical components into the model: orbital forcing and surface process of ice-sheet. We made several test runs for the implemented processes and show significant improvement in simulated climate. The results have been documented in EC-Earth development wiki and reported at EC-Earth meeting. We also suggest including these model implementations in the new model version that will serve for CMIP6 simulations. Besides the physical process implementation, we have set up mid-Holocene experiments and made several sensitivity simulations with collaborations in Bolin Centre. The results are written up into one article submitted and one manuscript in preparation. Several experiments are still running at the moment. A very different climate state, Last Glacial Maximum (21,000 years before present), has been setup on triolith and tested, but not be able to run the long spin-up. Therefore we have searched computer resources in ECMWF within the collaboration in EC-Earth community and run LGM spin-up there. All our model results are available to the research community to use and we advertise the simulations in meetings and workshops. By doing this we have established several national and Nordic collaborations on climate modelling and been involved in climate relevant proposal applications. We foresee more modelling demands in coming year with such collaboration development. The specific plans for simulations in coming year including: (1) Setup for last millennium (850-1850) and test the implemented forcings including volcanic forcing, solar radiation, land use; (2) Set up Last Interglacial simulation (128,000 years BP); (3) Set up mid-Pliocene (3 million year BP). All the above mentioned experiments, together with mid-Holocene and LGM experiment, will be our CMIP6 paleo-simulations. Before launch the official runs that will be delivered to CMIP6 database, we have to well evaluate our setup and minimize the unnecessary mistakes. Therefore quite a large amount of tests will be performed in the coming year. We also have several grants that require modelling effort. In a new VR grant “Greenland in a warming climate” (2015-2017) we have planned to improve the snow parameterisation and surface process of ice-sheet in EC-Earth, in order to understand the interaction between the Greenland ice-sheet and Arctic climate. We also run CAM-iso for past and present day climate in our SNSB (Swedish National Space Board) project “Atmospheric modelling using space-based observations of stable water isotopes (2012-2015)”. A VR project “A statistical framework for comparing paleoclimate data and climate models” (2013-2016) demands large ensemble simulations that currently we can not afford both from man power and computer resource, what we choose to do is to develop the statistical theory first with exist simulations and search for more recourses.