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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] (current) jypeter Added MARGO document submitted by Michal Kucera |
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- | //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 ===== |