source: TOOLS/CMIP6_FORCING/GHG/README @ 3595

Last change on this file since 3595 was 3595, checked in by tlurton, 4 years ago

20/02/2018 Th. Lurton
Updated paths to final location of input files on Ciclad: /prodigfs/project/input4MIPs/.

File size: 2.0 KB
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1Update 20 Feb. 2018
2Th. Lurton
3* Paths updated to final location of input data /prodigfs/project/input4MIPs/.
4
5Script updated on 5 Feb. 2018
6Th. Lurton
7* Paths changed to retrieve new input data versions;
8* Correction of hyphens/underscores in directory/file names in order to suit the new data version.
9
10
11GHG data for CMIP6 are initially coming from
12ftp://data.iac.ethz.ch/CMIP6/input4MIPs/UoM/GHGConc/CMIP
13see also http://www.climate-energy-college.net/cmip6
14They have been in September replaced by v1-2-0 from ESGF.
15The format of the netcdf has changed with one variable (and sectors) per file.
16The data were downloaded in September 2016 and are available
17on ciclad in /prodigfs/project/input4MIPs/UoM
18
19The data are processed to produce annual global mean files
20for the IPSL model. This is currently done on ciclad in
21/home/oboucher/CMIP6/GHG but will be moved in a central repository.
22
23The GHG to be used are
24
25CO2
26CH4
27N2O
28
29and either
30
31CFC11=CFC11eq
32CFC12=CFC12
33
34OR
35
36HFC134a-eq
37CFC12eq
38
39Do not use the original CFC11eq and CFC12eq together as some species
40would be double-counted
41
42At IPSL we chose the second way of doing for CMIP5, and we do likewise for CMIP6.
43HFC134-eq are converted into CFC11-eq using AR5 values for their 2011 RF and
44volume mixing ratios (Table 8.2 from Chapter 8, CFC11 0.062 Wm-2 for 238 pptv and
45HFC134eq 0.0100 Wm-2 for 62.7 pptv), which gives the following conversions:
46CFC11eq_CMIP6 <== HFC134a-eq * (0.0100/62.7)/(0.062/238.0)
47CFC12eq_CMIP6 <== CFC12eq
48
49So in the end, we have 5 files for GHG for CMIP6 runs with IPSL-CM6
50CO2_CMIP6_0000_2014.txt
51CH4_CMIP6_0000_2014.txt
52N2O_CMIP6_0000_2014.txt
53CFC11eq_CMIP6_0000_2014.txt
54CFC12eq_CMIP6_0000_2014.txt
55
56Note that the CFCeq files have non-zero values for pre-industrial conditions
57because they include some natural species.
58
59To produce the data used in CMIP6, just run the extract.sh script
60
61The plots in graphs are from Jean-Louis, blue is CMIP6, green is CMIP5.
62
63Olivier
6411/10/2016
65updated 13/12/2016
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