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pmip3:design:21k:final [2010/04/02 09:19]
jypeter Added 'Links' section
pmip3:design:21k:final [2010/12/06 23:38]
jypeter Added MARGO document submitted by Michal Kucera
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 <​html><​a name="​page_top_tag">&​nbsp</​a></​html>​ <​html><​a name="​page_top_tag">&​nbsp</​a></​html>​
-//Go to =>// [ [[pmip3:​design:​pi:​final|PI]] ] - [ [[pmip3:​design:​6k:​final|6ka]] ] - [ **21ka** ] - [ [[pmip3:​design:​lm:​final|LM]] ]+//Go to =>// [ [[pmip3:​design:​pi:​final|PI]] ] - [ [[pmip3:​design:​6k:​final|6ka]] ] - [ **21ka** ] - [ [[pmip3:​design:​lm:​final|LM]] ] & Non-CMIP5 exps: [ [[pmip3:​design:​li:​final|LI]] ]
  
 ====== 21ka Experimental Design====== ====== 21ka Experimental Design======
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 === Land-sea mask === === Land-sea mask ===
  
-This mask should be prescribed using the data provided in [[target.nc|file.nc]] where the ''​sftlf''​ variable is 0 (%) over the ocean and 100 (%) over land.+This mask should be prescribed using the data provided in the [[pmip3:​design:​download#​last_glacial_maximum|LGM BC download page]]where the ''​sftlf''​ variable is 0 (%) over the ocean and 100 (%) over land.
  
-If this proves difficult for a modelling group, the **__minimum__** implementation is to: +Make sure that the ocean model configuration keeps the following straits open:
-      * fill in the Hudson Bay and the Barents sea, which were covered by the main northern hemisphere ice-sheets. +
-      * close the Bering Strait (by changing the land-sea mask locally or imposing zero flux on water and sea-ice across the Bering Strait). +
-      * make sure that the ocean model configuration keeps the following straits open:+
           * Denmark Strait (between Greenland and Iceland).           * Denmark Strait (between Greenland and Iceland).
           * Gibraltar Strait.           * Gibraltar Strait.
           * Indonesian Throughflow (ITF).           * Indonesian Throughflow (ITF).
 +
 +The provided land-sea mask includes a Caspian Sea as defined, conservatively,​ by its modern day contour (the -29 m iso-altitude in this region in ICE-6G v2.0).
 +
 +If implementing the land-sea mask proves difficult for a modelling group, the **__minimum__** implementation is to:
 +      * fill in the Hudson Bay and the Barents sea, which were covered by the main northern hemisphere ice-sheets.
 +      * close the Bering Strait (by changing the land-sea mask locally or imposing zero flux on water and sea-ice across the Bering Strait).
  
 === Land surface elevation === === Land surface elevation ===
  
-The change in surface elevation specified by the ''​orog_diff''​ variable provided in [[target.nc|file.nc]] should be added to the present-day surface elevation, so that all the participating models will be perturbed in the same way.+The change in surface elevation specified by the ''​orog_diff''​ variable provided in the [[pmip3:​design:​download#​last_glacial_maximum|LGM BC download page]] should be added to the present-day surface elevation, so that all the participating models will be perturbed in the same way.
  
 Note: this specified change assumes that the surface elevation over present-day oceans is zero (m). Note: this specified change assumes that the surface elevation over present-day oceans is zero (m).
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 === Ice-sheet extent === === Ice-sheet extent ===
  
-The ice-sheet extent should be prescribed using the data provided in [[target.nc|file.nc]], where the ''​sftgif''​ variable is 0 (%) where there is no ice-sheet, or 100 (%).\\ This mask includes **ice shelves**, which should be included in models that allow this feature.+The ice-sheet extent should be prescribed using the data provided in the [[pmip3:​design:​download#​last_glacial_maximum|LGM BC download page]], where the ''​sftgif''​ variable is 0 (%) where there is no ice-sheet, or 100 (%).\\ This mask includes **ice shelves**, which should be included in models that allow this feature.
       * The ice shelves can be defined from the ''​sftgif''​ and ''​sftlf''​ variables as areas where:\\ ''​sftgif''​ == 100 **and** ''​sftlf''​ == 0       * The ice shelves can be defined from the ''​sftgif''​ and ''​sftlf''​ variables as areas where:\\ ''​sftgif''​ == 100 **and** ''​sftlf''​ == 0
       * Groups implementing the provided ice shelves should keep the Greenland-Iceland ridge open in the ocean configuration.       * Groups implementing the provided ice shelves should keep the Greenland-Iceland ridge open in the ocean configuration.
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 === Ocean bathymetry === === Ocean bathymetry ===
  
-The mean sea-level change corresponding to the ice-sheet reconstruction to be used in the PMIP3 LGM experiment is approximatively ​NNN m. A more complete description of the change in bathymetry can be computed from the Peltier [[https://​pmip3.lsce.ipsl.fr/​under_construction_ask_jy|ICE-6G v2.0 reconstruction]].+The mean sea-level change corresponding to the ice-sheet reconstruction to be used in the PMIP3 LGM experiment is approximatively ​116 m. A more complete description of the change in bathymetry can be computed from the Peltier [[https://​pmip3.lsce.ipsl.fr/​under_construction_ask_jy|ICE-6G v2.0 reconstruction]].
  
 The ocean bathymetry will be adapted by each group, depending on the flexibility of their ocean model. The ocean bathymetry will be adapted by each group, depending on the flexibility of their ocean model.
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   * Groups with high resolution model for which it is too difficult to run long simulations should contact [[Olivier.marti@lsce.ipsl.fr|Olivier Marti]] and [[pmip2db@lsce.ipsl.fr|Jean-Yves Peterschmitt]] to find the best alternative solution. ​   * Groups with high resolution model for which it is too difficult to run long simulations should contact [[Olivier.marti@lsce.ipsl.fr|Olivier Marti]] and [[pmip2db@lsce.ipsl.fr|Jean-Yves Peterschmitt]] to find the best alternative solution. ​
 +
 +===== PMIP3 Kyoto meeting related documents =====
 +
 +  * {{:​pmip3:​design:​21k:​margo_memorandum1.pdf|The MARGO synthesis of sea-surface temperature reconstructions for the Last Glacial Maximum as a benchmark for PMIP3 data-model comparison}}\\ Perspectives and limitations discussion document - 6.12.2010\\ MARGO core group: Michal Kucera, Alan Mix, André Paul, Antoni Rosell-Melé,​ Ralph Schneider, Claire Waelbroeck, Mara Weinelt
  
 ===== Links ===== ===== Links =====
pmip3/design/21k/final.txt · Last modified: 2010/12/06 23:38 by jypeter