pmip3:cmip6:design:21k:index
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pmip3:cmip6:design:21k:index [2015/03/27 11:19] jypeter Started cosmetic changes |
pmip3:cmip6:design:21k:index [2016/06/20 15:34] (current) jypeter Added link to experimental design on PMIP4 web site |
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| ====== PMIP-CMIP6 Experimental Design Discussion: Last Glacial Maximum ====== | ====== PMIP-CMIP6 Experimental Design Discussion: Last Glacial Maximum ====== | ||
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| + | <note warning>The PMIP4 experimental design available on the PMIP3 wiki has been **superseded** by the experimental design detailed on the [[https://pmip4.lsce.ipsl.fr/doku.php/exp_design|PMIP4 web site]]</note> | ||
| <note tip>\\ Please submit your comments in the Discussion section at the end of this page</note> | <note tip>\\ Please submit your comments in the Discussion section at the end of this page</note> | ||
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| **solar constant** = same as PI | **solar constant** = same as PI | ||
| - | **Concentration of atmospheric trace gases** | + | |
| + | ===== Concentration of atmospheric trace gases ===== | ||
| **CO<sub>2</sub>** = 185 ppm | **CO<sub>2</sub>** = 185 ppm | ||
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| **CFC** = 0 | **CFC** = 0 | ||
| - | O<sub>3</sub> = same as in CMIP5 PI | + | **O<sub>3</sub>** = same as in CMIP5 PI |
| - | ** Topography/bathymetry/coastlines/ice sheets **: | + | ===== Topography/bathymetry/coastlines/ice sheets ===== |
| - | This is one of the major changes compared to pre-industrial. Imposing the lgm ice sheets means imposing new coastlines, new topography/bathymatry and new ice sheet extent. | + | This is one of the major changes compared to pre-industrial. Prescribing the lgm ice sheets means implementing new coastlines, a new topography/bathymetry and a new ice sheet extent. |
| - | For those modelling groups running the lgm experiment but not the deglaciation, we recommend to use the PMIP3 ice sheets/coastlines, for simulations for PMIP3-CMIP5 and CMIP6 to be strictly comparable. | + | * Modelling groups planning to run the lgm experiment but **not the deglaciation** are advised to use the [[pmip3:design:21k:final#ice-sheets_and_related_changes|PMIP3 ice sheets/coastlines]], so that PMIP3-CMIP5 and CMIP6 can be rigorously compared. |
| - | For those modelling groups who plan to run the deglaciation experiment (cf PMIP3 deglaciation working group), the new boundary conditions provided by Dick Peltier and Lev Tarasov can be used as well. | + | * Modelling groups planning to **run lgm as the start of the the deglaciation experiment** (cf [[pmip3:wg:degla:index|PMIP3 deglaciation working group]]) can use the new boundary conditions provided by Dick Peltier and Lev Tarasov. |
| - | ** Vegetation and land surface:** | ||
| - | Computed using a dynamical vegetation module, | + | ===== Vegetation and land surface ===== |
| - | Or prescribed as in PI, with phenology computed for models with active carbon cycle or prescribed from data | + | * Computed using a dynamical vegetation module, |
| + | * or prescribed as in PI, with phenology computed for models with active carbon cycle | ||
| + | * or prescribed from data | ||
| + | ===== Carbon cycle ===== | ||
| - | ** Carbon cycle ** | + | Interactive, with atmospheric concentration prescribed and ocean and land carbon fluxes diagnosed as recommended in CMIP5. |
| - | Interactive, with atmospheric concentration prescribed and ocean and land carbon fluxes diagnosed as recommended in CMIP5 | + | For PCMIP: fully interactive with atmospheric concentration computed by the model. |
| - | ** Dust cycle ** | + | |
| + | ===== Dust cycle ===== | ||
| We invite the modelling groups planning to run simulations with an interactive dust cycle to comment on the most appropriate methodology for their model, in particular as to their ability to use a interactive vegetation description. | We invite the modelling groups planning to run simulations with an interactive dust cycle to comment on the most appropriate methodology for their model, in particular as to their ability to use a interactive vegetation description. | ||
| - | ** A note on the fresh water budget ** | + | |
| + | ===== Note on the fresh water budget ===== | ||
| Modelling groups are advised to carefully check the fresh water budget in their lgm experiments in order to avoid unnecessary drifts of the ocean salinity. It can be necessary to route the snow which has fallen in excess on the ice sheets to the ocean. Given the change in coastlines, it is also sometimes necessary relocate the large rivers' estuaries on the coast. | Modelling groups are advised to carefully check the fresh water budget in their lgm experiments in order to avoid unnecessary drifts of the ocean salinity. It can be necessary to route the snow which has fallen in excess on the ice sheets to the ocean. Given the change in coastlines, it is also sometimes necessary relocate the large rivers' estuaries on the coast. | ||
| - | ** Glocal ocean salinity ** | ||
| - | Add 1PSU | ||
| + | ===== Global ocean salinity ===== | ||
| - | \\ \\ \\ | + | Add **1 PSU**. |
| - | ---- | + | |
| - | [ [[pmip3:|PMIP3 Wiki Home]] ] - | + | |
| - | [ [[pmip3:wiki_help|Help!]] ] - | + | |
| - | [ [[wiki:syntax|Wiki syntax]] ] | + | |
pmip3/cmip6/design/21k/index.1427455181.txt.gz · Last modified: 2015/03/27 11:19 by jypeter
