pmip3:design:lm:index
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pmip3:design:lm:index [2009/08/01 21:38] gavin |
pmip3:design:lm:index [2009/12/23 13:40] jypeter Closed the discussion |
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| ~~ODT~~ | ~~ODT~~ | ||
| - | ~~DISCUSSION~~ | + | ~~DISCUSSION:closed~~ |
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| ^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
| - | | Orbital parameters | Annually varying (850-1850) (Table provided if not internally calculated)| 1850 values or same as Pre-Ind CMIP5 control [ **ecc** = ] - [ **obl** = ° ] - [ **peri-180°** = ° ] | | + | | Orbital parameters | Annually varying\\ [[index#orbital_forcing|Table provided (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) (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>** = ] | |
| - | | Volcanic Aerosols | Multiple reconstructions (of AOD, Effective Radius, Mass) | | | + | | Volcanic Aerosols | Multiple reconstructions (of AOD, Effective Radius, Mass) | | |
| - | | | | | | + | |
| | Solar irradiance | Multiple reconstructions (default TBD) | | | | Solar irradiance | Multiple reconstructions (default TBD) | | | ||
| - | | Ozone | solar related variations (parameterised as function of change in solar irradiance - Drew Shinedll) | same as pre-Ind control | | + | | Ozone | solar related variations (parameterised as function of change in solar irradiance - Drew Shindell) | same as pre-Ind control | |
| - | | Aerosols | biomass burning changes???? | same as pre-Ind control | | + | | Aerosols | biomass burning changes???? | same as pre-Ind control | |
| - | | Vegetation | Land use conversion (forests to C3/C4 crops) (Pongratz, 2008, Foley and Ramunkutty) | No change from Pre-Ind control | | + | | Vegetation | Land use conversion (forests to C3/C4 crops) (Pongratz, 2009, Foley and Ramunkutty)\\ Available from WDCC-Hamburg\\ (http://cera-www.dkrz.de/WDCC/ui/Entry.jsp?acronym=LAND_COV_scen_800_1699) | No change from Pre-Ind control | |
| - | | | available from WDCC-Hamburg (http://cera-www.dkrz.de/WDCC/ui/Entry.jsp?acronym=LAND_COV_scen_800_1699) | | | + | |
| | Ice sheets | No changes from Pre-Ind control | | | | Ice sheets | No changes from Pre-Ind control | | | ||
| - | | Topography and coastlines | No change from Pre-Ind control | | | + | | Topography and coastlines | No change from Pre-Ind control | | |
| Please use the [[index#page_bottom_tag|discussion]] panel to **comment** this table! | Please use the [[index#page_bottom_tag|discussion]] panel to **comment** this table! | ||
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| Candidate datasets: Crowley, Ammann - differences in thresholds for significant eruptions, peak forcing etc. Need merged/consistent fields. (Ammann) | Candidate datasets: Crowley, Ammann - differences in thresholds for significant eruptions, peak forcing etc. Need merged/consistent fields. (Ammann) | ||
| + | |||
| + | ==== Reconstructed evolution of trace gases ==== | ||
| + | |||
| + | The evolution of CO<sub>2</sub>, CH<sub>2</sub>, N<sub>2</sub>O over past 2 millennia {{:pmip3:design:lm:ghg_lawdome_giss_merge_c5mip_24jul09.1-2000.txt|table}} has been provided by [[joos@climate.unibe.ch|Fortunat Joos]] (University of Bern). Methods and references are provided in the downloadable file. | ||
| + | |||
| + | |||
| + | ==== Orbital forcing ==== | ||
| + | |||
| + | The following orbital parameters parameters should be used, if they are not internally calculated. | ||
| + | |||
| + | Note: calculation from Berger (1978), annually varying. | ||
| + | |||
| + | === 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
