Effective radiative forcing (ERF) experiments with EC-Earth3

<p># Effective radiative forcing (ERF) experiments with EC-Earth3</p> <p>Contact: klaus.wyser@smhi.se<br> Date: 2020-10-19</p> <p>The tarball contains the datasets that have been used to assess the ERF of the modified MACv2-SP forcing that has been prepared for the CovidMIP experiments. All experiments were done with the EC-Earth3 model (https://portal.enes.org/models/earthsystem-models/ec-earth/ec-earth) that includes the MACv2-SP aerosol forcing including the effects on the cloud droplet activation.</p> <p>Following the CFMIP protocol the ERF is obtained by running the model in atmosphere-only mode with prescribed SST and sea-ice from the piControl simulation. Two experiments are needed to assess the ERF: a control experiment (mctl) in which the all forcings are kept constant at the pre-industrial level, and a sensitivity experiment in which only the MACv2-SP forcing is taken from a different scenario from a specific year. Both control and sensitivty experiment are then run for 55 years.<br> &nbsp;</p> <p>The following MACv2-SP forcings were used in the different experiments:<br> &nbsp;- **mctl**: all forcings as in the piControl experiment<br> &nbsp;- **mba2**: forcing for year 2020 from the new ssp245 baseline dataset<br> &nbsp;- **mba5**: forcing for year 2050 from the new ssp245 baseline dataset<br> &nbsp;- **mbl2**: forcing for year 2020 from the TwoYearBlip dataset<br> &nbsp;- **msg5**: forcing for year 2050 from the StrongGreen recovery dataset<br> &nbsp;- **mmg5**: forcing for year 2050 from the ModerateGreen recovery dataset<br> &nbsp;- **mff5**: forcing for year 2050 from the FossilFuel rebound dataset</p> <p>The following variables from the model output are included in the dataset:<br> &nbsp;- **tsr**: Top of the atmosphere (TOA) SW radiation (all sky)<br> &nbsp;- **tsrc**: TOA SW radiation (clear sky)<br> &nbsp;- **tsra**: TOA SW radiation (cloudy sky)<br> &nbsp;- **ttr**: TOA LW radiation (all sky)<br> &nbsp;- **ttrc**: TOA LW radiation (clear sky)<br> &nbsp;- **ttra**: TOA LW radiation (cloudy sky)<br> &nbsp;- **ssr**: Surface SW radiation (all sky)<br> &nbsp;- **ssrc**: Surface SW radiation (clear sky)<br> &nbsp;- **ssra**: Surface SW radiation (cloudy sky)<br> &nbsp;- **str**: Surface LW radiation (all sky)<br> &nbsp;- **strc**: Surface LW radiation (clear sky)<br> &nbsp;- **stra**: Surface LW radiation (cloudy sky)<br> &nbsp;</p> <p>These variables have been used to compute timeseries and maps of the different components of the ERF:<br> &nbsp;- **erf**: ERF at TOA (all sky)<br> &nbsp;- **erfc**: ERF at TOA (clear sky)<br> &nbsp;- **erfa**: ERF at TOA (cloudy sky)<br> &nbsp;- **erfsfc**: ERF at SFC (all sky)<br> &nbsp;- **erfsfcc**: ERF at SFC (clear sky)<br> &nbsp;- **erfsfca**: ERF at SFC (cloudy sky)</p> <p>The script **stats.sh** has been used to compute the ERF.</p>