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database:drs [2016/08/30 17:10] – Added some internal links jypeterdatabase:drs [2017/06/09 10:32] (current) – Added link to CV definition @ github jypeter
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   * **CV**: sometimes the value of a given **attribute** has to be taken from a predefined set of values, known as a //Controlled Vocabulary// (**CV**)   * **CV**: sometimes the value of a given **attribute** has to be taken from a predefined set of values, known as a //Controlled Vocabulary// (**CV**)
 +    * [[https://github.com/WCRP-CMIP/CMIP6_CVs|CMIP6 allowed CV values]]
  
-  * **DRS** = //Data Reference Syntax//: the //DRS// is used to identify experiments, simulations, ensembles of experiments, atomic datasets and is used, for example, in file names, directory structures, the further_info_url, and in facets of some search tools+  * **DRS** = //Data Reference Syntax//: the //DRS// is used to identify experiments, simulations, ensembles of experiments, atomic datasets and is used, for example, in [[#pmip4-cmip6_directory_structure_and_file_names|file names, directory structures]], the further_info_url, and in //facets// of some search tools 
 +  * **facet** = a category or attribute you can put a search constraint on, when doing a //faceted search//
  
-Example: the ''experiment_id'' **attribute** is used in the **DRS**, and its value has to be chosen from a **CV** ([//piControl//, //past1000//, //lgm//, ...])+Example: the ''experiment_id'' **attribute** is used in the **DRS**, and its value has to be chosen from a **CV** ([//piControl//, //past1000//, //lgm//, ...]).\\ On the [[https://esgf-node.ipsl.upmc.fr/search/cmip5-ipsl/|IPSL CMIP5 search node]], you can put a search constraint on the //Experiment// **facet** by clicking on //Experiment//  and then selecting //lgm// and clicking on //Search//
 </WRAP> </WRAP>
  
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   * **CMIP6** document: [[https://docs.google.com/document/d/1h0r8RZr_f3-8egBMMh7aqLwy3snpD6_MrDz1q8n5XUk/edit|CMIP6 Global Attributes, DRS, Filenames, Directory Structure, and CV’s (version 1.0)]]   * **CMIP6** document: [[https://docs.google.com/document/d/1h0r8RZr_f3-8egBMMh7aqLwy3snpD6_MrDz1q8n5XUk/edit|CMIP6 Global Attributes, DRS, Filenames, Directory Structure, and CV’s (version 1.0)]]
 +    * Note: [[https://github.com/WCRP-CMIP/CMIP6_CVs|CMIP6 allowed CV values]]
  
   * Legacy **CMIP5** documents:   * Legacy **CMIP5** documents:
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 </WRAP> </WRAP>
  
 +Reminder: **DECK** = //Diagnostic, Evaluation and Characterization of Klima//. More information on the CMIP6 experiments is available in [[http://www.geosci-model-dev.net/9/1937/2016/|Eyring et al 2017]]
  
 ^ ''experiment_id'' ^ ''experiment'' ^ ^ ''experiment_id'' ^ ''experiment'' ^
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 | LD''v1''-transpin | [[exp_design:degla#transient_orbit_and_trace_gases_spinup_26-21_ka|Transient orbit and trace gases spinup (26-21 ka)]] | Work | | LD''v1''-transpin | [[exp_design:degla#transient_orbit_and_trace_gases_spinup_26-21_ka|Transient orbit and trace gases spinup (26-21 ka)]] | Work |
 | LD''v1'' | [[exp_design:degla#transient_deglaciation_21-0_ka|Transient deglaciation (21-0 ka)]] | Work | | LD''v1'' | [[exp_design:degla#transient_deglaciation_21-0_ka|Transient deglaciation (21-0 ka)]] | Work |
 +|  FIXME  | Early Holocene (9.5 ka? 8.5 ka?) | Work |
 +|  lig116k ?  | Transition from the LIG to the glacial\\ (2 experiments) | Work |
 +|  FIXME  | MIS11\\ (2 experiments)  | Work |
 +|  FIXME  | Transient Holocene (6 ka to 0) | Work |
 +|  FIXME  | Transient LIG (130 ka to 125 ka) | Work |
 +|  FIXME  | [[http://www.deepmip.org/|DeepMIP]] | Work |
 +|  FIXME  | More experiments to come... ||
  
 ===== Handling groups of simulations ===== ===== Handling groups of simulations =====
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-==== Recommended variant_label values for PMIP4 experiments ====+==== PMIP4 and variant_label notes ==== 
 + 
 +Reminder: each option in ''r<k>i<l>p<m>f<n>'' has to be a strictly positive integer 
 + 
 +=== realization_index r<k> === 
 + 
 +The long PMIP4 simulations are going to require both a lot of processing power and a lot of storage. It is quite likely that there will be **only one realization**, for a given set of //i<l>p<m>f<n>// and that the variant label will always start with ''r1'' 
 + 
 +=== forcing_index f<n> === 
 + 
 +Depending on available resources, the PMIP4 groups may choose to perform several simulations for the same experiment, using different combinations of forcings. **The forcings used will have to be carefully described** in the documentation (and in the metadata inside each NetCDF file) and be //encoded// in the integer value of the forcing_index. 
 + 
 +There are several ways to proceed. The easiest way is to let each group choose its own way of numbering the forcings combinations (and document it!), but **all groups should try to use a common scheme** for and associate the same combination of forcings with the same integer 
 + 
 +== Sequential numbering scheme == 
 + 
 +The contact people for each experiment determine which forcings combinations are most likely to be used and associate them with a predefined number. If necessary, a group can later ask for a new forcing combination to be registered 
 + 
 +^ Forcings ^  f''forcing_index''  ^ 
 +| Recommended default,\\ or most likely combination,\\ or mandatory simulation |  ''f1''  | 
 +| forcing1='on', forcing2='off', etc |  ''f2''  | 
 +| Some other combination |  ''fN''  | 
 + 
 +== Hierarchical numbering scheme == 
 + 
 +The following scheme will create bigger integers, but the values will be more meaningful 
 + 
 +If there are 10 or less options for each type of forcing, we can assign a power of 10 to each type, multiply it with the forcing option and add everything 
 + 
 +Tentative example for the [[exp_design:lgm|lgm]] experiment: 
 + 
 +^  Power  ^  Forcing  ^ Options ^ 
 +|  2  |  Ice sheet  | ''1''=//ICE-6G-C//\\ ''2''=//GLAC-1D// | 
 +|  1  |  Aerosols  | ''1''=//Hopcroft et al//\\ ''2''=//Albani et al// | 
 +|  0  |  Vegetation  | ''1''=//interactive vegetation//\\ ''2''=//interactive carbon cycle//\\ ''3''=//prescribed// | 
 + 
 +Example: //GLAC-1D// + //Hopcroft et al// + //interactive vegetation// = ''2 * 100 + 1 * 10 + 1'' => ''f211'' 
 + 
 +==== variant_label constraints for PMIP4 experiments ==== 
 + 
 +=== historical === 
 + 
 +''historical'' simulations that are the continuation of a [[exp_design:lm|past1000]] simulation should use ''1000'' for the ''initialization_method'' => ''i1000'' 
 + 
 +=== past1000 === 
 + 
 + 
 +FIXME 
 + 
 +=== mid-Holocene === 
 + 
 +FIXME 
 + 
 +There are at least [[exp_design:mh#sensitivity_experiments|2 sensitivity experiments]] 
 + 
 +=== lgm === 
 + 
 + 
 +FIXME 
 + 
 +=== lig127k === 
 + 
 +FIXME 
 + 
 +There are at least [[exp_design:lig127#sensitivity_experiments|3 sensitivity experiments]] 
 + 
 +=== midPliocene-eoi400 === 
 + 
 + 
 +FIXME 
 + 
 +=== LD-LGMspin === 
 + 
 + 
 +FIXME 
 + 
 +=== LD-transpin === 
 + 
 + 
 +FIXME 
 + 
 +=== LD === 
 + 
 + 
 +FIXME 
 + 
 +=== Other PMIP4 specific experiments === 
 + 
 +There may be other experiments listed in [[#proposed_pmip4_experiment_id_values|Proposed PMIP4 experiment_id values]] and [[exp_design:index#pmip4_experiments|PMIP4 experiments]]
  
 FIXME FIXME
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   * Directory = ''CMIP6/DCPP/NCAR/CCSM2-1/dcppA-hindcast/s1960-r1i2p1f1/Amon/tas/gr/v20150320/''\\ File = ''tas_Amon_CCSM2-1_hindcast_s1960-r1i2p1f1_gn_198001-198412.nc''   * Directory = ''CMIP6/DCPP/NCAR/CCSM2-1/dcppA-hindcast/s1960-r1i2p1f1/Amon/tas/gr/v20150320/''\\ File = ''tas_Amon_CCSM2-1_hindcast_s1960-r1i2p1f1_gn_198001-198412.nc''
 +
 +===== CMIP6 data license and acknowledgement =====
 +
 +<WRAP center round important 60%>
 +PMIP data users have to add the following PMIP-specific sentence to their acknowledgement:\\ **//PMIP is endorsed by both WCRP/WGCM and Future Earth/PAGES//**
 +</WRAP>
 +
 +
 +==== Data users ====
 +
 +The data end users have to follow the Terms of Use and licensing information detailed on the [[https://pcmdi.llnl.gov/home/CMIP6/CitationRequirements6-0.html|CMIP6: Proper citation and acknowledgement]] page.
 +
 +==== Data providers ====
 +
 +The Terms of Use are also detailed in the ''license'' global attribute available in each data file created by the providers
 +
 +Note: you can get the [[https://github.com/WCRP-CMIP/CMIP6_CVs/blob/master/CMIP6_license.json|latest version of the license]] on github.
 +
 +<code>
 +The “license” attribute should record the following statement (with segments in square brackets optional, and with required, appropriate text entered in place of <*> ): 
 +
 +“CMIP6 model data produced by <Your Centre Name> is licensed under a Creative Commons Attribution-[NonCommercial-]ShareAlike 4.0 International License (https://creativecommons.org/licenses). Use of the data must be acknowledged following guidelines found at https://pcmdi.llnl.gov/home/CMIP6/CitationRequirements6-0.html. Further information about this data, including some limitations, can be found via the further_info_url (recorded as a global attribute in this file)[ and at <some URL maintained by modeling group>]. The data producers and data providers make no warranty, either express or implied, including, but not limited to, warranties of merchantability and fitness for a particular purpose. All liabilities arising from the supply of the information (including any liability arising in negligence) are excluded to the fullest extent permitted by law.”
 +
 +The [*] indicates that institutions may choose to use the Non-commercial version of this license by inserting the words “NonCommercial” at this point, but this will significantly limit the use of the data in downstream climate mitigation and adaptation applications.  Please do not simply copy the statement above when writing data; Some text must be entered, some text is optional and the symbols “[*]” should not appear in the licensing text.
 +</code>
 +
 +==== Details about the Creative Commons licenses ====
 +
 +You can read the //The Licenses// section of [[https://creativecommons.org/licenses/?lang=en|About The Licenses]] if you want to understand the **Creative Commons** copyright licenses. You can also read the [[https://wiki.creativecommons.org/images/6/6d/6licenses-flat.pdf|Six licenses for sharing your work]] summary pdf.
 +
 +More specifically, CMIP6 data will be distributed under the following 2 licenses (each institute has to choose one license)
 +
 +^  Logo  ^ Abbreviation ^ Full name ^ Details ^
 +| {{:database:by-sa.png?nolink&200}} | CC BY-SA 4.0 | Attribution-ShareAlike 4.0 International | https://creativecommons.org/licenses/by-sa/4.0/ |
 +| {{:database:by-nc-sa.png?nolink&200}} | CC BY-NC-SA 4.0 | Attribution-NonCommercial-ShareAlike 4.0 International | https://creativecommons.org/licenses/by-nc-sa/4.0/ |
 +
 +Note: CC buttons and logos are available from the CC site [[https://creativecommons.org/about/downloads/|Downloads]] page.
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  • Last modified: 2016/08/30 17:10
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