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pmip3:cmip6:design:6k:index [2015/03/24 21:17] masa |
pmip3:cmip6:design:6k:index [2015/03/24 21:24] masa |
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The main forcing is the insolation, and the astronomical parameters must be set to: | The main forcing is the insolation, and the astronomical parameters must be set to: | ||
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**eccentricity** = 0.018682 | **eccentricity** = 0.018682 | ||
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**obliquity** = 24.105° | **obliquity** = 24.105° | ||
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**perihelion-180°** = 0.87° | **perihelion-180°** = 0.87° | ||
**Concentration of atmospheric trace gases:** | **Concentration of atmospheric trace gases:** | ||
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CO2 = 280 ppm | CO2 = 280 ppm | ||
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CH4 = 650 ppb | CH4 = 650 ppb | ||
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N2O = 270 ppb | N2O = 270 ppb | ||
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CFC = 0 | CFC = 0 | ||
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O3 = same as in CMIP5 PI | O3 = same as in CMIP5 PI | ||
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+ | ** Topography/bathymetry/coastlines **: unchanged compared to pre-industrial | ||
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+ | ** Vegetation and land surface:** | ||
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+ | Computed using a dynamical vegetation module, | ||
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+ | Or prescribed as in PI, with phenology computed for models with active carbon cycle or prescribed from data | ||
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+ | No change in ice sheet extent | ||
+ | ** Carbon cycle ** | ||
+ | Interactive, with atmospheric concentration prescribed and ocean and land carbon fluxes diagnosed as recommended in CMIP5 | ||
+ | ** 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. | ||