source: TOOLS/CMIP6_FORCING/GHG/README @ 3386

Last change on this file since 3386 was 3386, checked in by oboucher, 6 years ago

Uploading scripts to produce the GHG forcing files for CMIP6

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1GHG data for CMIP6 are initially coming from
2ftp://data.iac.ethz.ch/CMIP6/input4MIPs/UoM/GHGConc/CMIP
3see also http://www.climate-energy-college.net/cmip6
4They have been in September replaced by v1-2-0 from ESGF.
5The format of the netcdf has changed with one variable (and sectors) per file.
6The data were downloaded in September 2016 and are available
7on ciclad in /prodigfs/project/input4MIPs/UoM
8
9The data are processed to produce annual global mean files
10for the IPSL model. This is currently done on ciclad in
11/home/oboucher/CMIP6/GHG but will be moved in a central repository.
12
13The GHG to be used are
14
15CO2
16CH4
17N2O
18
19and either
20
21CFC11=CFC11eq
22CFC12=CFC12
23
24OR
25
26HFC134a-eq
27CFC12eq
28
29Do not use the original CFC11eq and CFC12eq together as some species
30would be double-counted
31
32At IPSL we chose the second way of doing for CMIP5, and we do likewise for CMIP6.
33HFC134-eq are converted into CFC11-eq using AR5 values for their 2011 RF and
34volume mixing ratios (Table 8.2 from Chapter 8, CFC11 0.062 Wm-2 for 238 pptv and
35HFC134eq 0.0100 Wm-2 for 62.7 pptv), which gives the following conversions:
36CFC11eq_CMIP6 <== HFC134a-eq * (0.0100/62.7)/(0.062/238.0)
37CFC12eq_CMIP6 <== CFC12eq
38
39So in the end, we have 5 files for GHG for CMIP6 runs with IPSL-CM6
40CO2_CMIP6_0000_2014.txt
41CH4_CMIP6_0000_2014.txt
42N2O_CMIP6_0000_2014.txt
43CFC11eq_CMIP6_0000_2014.txt
44CFC12eq_CMIP6_0000_2014.txt
45
46Note that the CFCeq files have non-zero values for pre-industrial conditions
47because they include some natural species.
48
49To produce the data used in CMIP6, just run the extract.sh script
50
51The plots in graphs are from Jean-Louis, blue is CMIP6, green is CMIP5.
52
53Olivier
5411/10/2016
55updated 13/12/2016
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