pmip3:design:lm:index
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pmip3:design:lm:index [2009/09/11 23:33] gavin |
pmip3:design:lm:index [2009/09/17 08:17] jypeter Added link to orbital parameters' table, and cosmetic changes |
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| ^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
| - | | Orbital parameters | Annually varying (Table provided (for years 0-2100 CE/AD) if not internally calculated) | 1850 values [ **ecc** = 0.01676 ] - [ **obl** = 23.459° ] - [ **peri-180°** = 280.32687° ] or same as Pre-Ind CMIP5 control | | + | | Orbital parameters | Annually varying (Table provided (for years 0-2100 CE/AD) if not internally calculated) | 1850 values [ **ecc** = 0.01676 ] - [ **obl** = 23.459° ] - [ **peri-180°** = 100.327° ] or same as Pre-Ind CMIP5 control | |
| | Date of vernal equinox | Mar 21 hr 0 | same as CMIP5 control | | | Date of vernal equinox | Mar 21 hr 0 | same as CMIP5 control | | ||
| | Trace gases | Annually varying (850-1850) ([[index#reconstructed_evolution_of_trace_gases|Table provided]]) | constant at CMIP5 control levels [ **CO<sub>2</sub>** = ppm ] - [ **CH<sub>4</sub>** = ppb ] - [ **N<sub>2</sub>O** = ppb ] - [ **CFC** = ] - [ **O<sub>3</sub>** = ] | | | Trace gases | Annually varying (850-1850) ([[index#reconstructed_evolution_of_trace_gases|Table provided]]) | constant at CMIP5 control levels [ **CO<sub>2</sub>** = ppm ] - [ **CH<sub>4</sub>** = ppb ] - [ **N<sub>2</sub>O** = ppb ] - [ **CFC** = ] - [ **O<sub>3</sub>** = ] | | ||
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| ==== Orbital forcing ==== | ==== Orbital forcing ==== | ||
| - | Calculation from Berger (1978), annually varying. | + | The following orbital parameters parameters should be used, if they are not internally calculated. |
| - | Note that over the period 0-2100 CE, the parameters are well approximated by linear regressions | + | |
| - | ECC = 0.017475 - 0.000000382*Year | + | Note: calculation from Berger (1978), annually varying. |
| - | OBL = 23.697 - 0.000128*Year | + | |
| - | PERI= 248.79 + 0.0170*Year | + | === Precomputed table === |
| + | |||
| + | The {{:pmip3:design:lm:pmip3_lm_orbital_parameters.txt|parameters' table}} has been supplied by | ||
| + | [[gschmidt@giss.nasa.gov|Gavin Schmidt]] (GISS). | ||
| + | |||
| + | === Linear regressions === | ||
| + | |||
| + | Over the period 0-2100 CE, the parameters are well approximated by the following linear regressions: | ||
| + | |||
| + | ^ Parameter ^ Linear approximation ^ | ||
| + | | ECC | 0.017475 - 0.000000382 * Year | | ||
| + | | OBL | 23.697 - 0.000128 * Year | | ||
| + | | PERI-180 | 68.79 + 0.0170 * Year | | ||
pmip3/design/lm/index.txt · Last modified: 2010/09/16 12:38 by jypeter
