| 1 | GHG data for CMIP6 are initially coming from |
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| 2 | ftp://data.iac.ethz.ch/CMIP6/input4MIPs/UoM/GHGConc/CMIP |
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| 3 | see also http://www.climate-energy-college.net/cmip6 |
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| 4 | They have been in September replaced by v1-2-0 from ESGF. |
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| 5 | The format of the netcdf has changed with one variable (and sectors) per file. |
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| 6 | The data were downloaded in September 2016 and are available |
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| 7 | on ciclad in /prodigfs/project/input4MIPs/UoM |
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| 8 | |
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| 9 | The data are processed to produce annual global mean files |
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| 10 | for the IPSL model. This is currently done on ciclad in |
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| 11 | /home/oboucher/CMIP6/GHG but will be moved in a central repository. |
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| 12 | |
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| 13 | The GHG to be used are |
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| 14 | |
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| 15 | CO2 |
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| 16 | CH4 |
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| 17 | N2O |
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| 18 | |
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| 19 | and either |
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| 20 | |
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| 21 | CFC11=CFC11eq |
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| 22 | CFC12=CFC12 |
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| 23 | |
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| 24 | OR |
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| 25 | |
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| 26 | HFC134a-eq |
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| 27 | CFC12eq |
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| 28 | |
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| 29 | Do not use the original CFC11eq and CFC12eq together as some species |
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| 30 | would be double-counted |
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| 31 | |
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| 32 | At IPSL we chose the second way of doing for CMIP5, and we do likewise for CMIP6. |
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| 33 | HFC134-eq are converted into CFC11-eq using AR5 values for their 2011 RF and |
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| 34 | volume mixing ratios (Table 8.2 from Chapter 8, CFC11 0.062 Wm-2 for 238 pptv and |
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| 35 | HFC134eq 0.0100 Wm-2 for 62.7 pptv), which gives the following conversions: |
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| 36 | CFC11eq_CMIP6 <== HFC134a-eq * (0.0100/62.7)/(0.062/238.0) |
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| 37 | CFC12eq_CMIP6 <== CFC12eq |
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| 38 | |
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| 39 | So in the end, we have 5 files for GHG for CMIP6 runs with IPSL-CM6 |
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| 40 | CO2_CMIP6_0000_2014.txt |
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| 41 | CH4_CMIP6_0000_2014.txt |
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| 42 | N2O_CMIP6_0000_2014.txt |
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| 43 | CFC11eq_CMIP6_0000_2014.txt |
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| 44 | CFC12eq_CMIP6_0000_2014.txt |
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| 45 | |
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| 46 | Note that the CFCeq files have non-zero values for pre-industrial conditions |
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| 47 | because they include some natural species. |
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| 48 | |
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| 49 | To produce the data used in CMIP6, just run the extract.sh script |
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| 50 | |
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| 51 | The plots in graphs are from Jean-Louis, blue is CMIP6, green is CMIP5. |
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| 52 | |
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| 53 | Olivier |
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| 54 | 11/10/2016 |
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| 55 | updated 13/12/2016 |
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