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pmip3:design:lm:index [2009/09/12 01:35]
gavin
pmip3:design:lm:index [2010/02/12 15:55]
jypeter Added link to 8k2
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 ~~ODT~~ ~~ODT~~
-~~DISCUSSION~~+~~DISCUSSION:closed~~
  
 <​html><​a name="​page_top_tag">&​nbsp</​a></​html>​ <​html><​a name="​page_top_tag">&​nbsp</​a></​html>​
-//Go to =>// [ [[pmip3:​design:​pi:​index|PI]] ] - [ [[pmip3:​design:​6k:​index|6ka]] ] - [ [[pmip3:​design:​21k:​index|21ka]] ] - [ **LM** ] - [ [[pmip3:​design:​li:​index|LI]] ] - [ [[pmip3:​design:​plio:​index|Plio]] ]+//Go to =>// [ [[pmip3:​design:​pi:​index|PI]] ] - [ [[pmip3:​design:​6k:​index|6ka]] ] - [ [[pmip3:​design:​21k:​index|21ka]] ] - [ **LM** ​] - [ [[pmip3:​design:​8k2:​index|8.2ka]] ​] - [ [[pmip3:​design:​li:​index|LI]] ] - [ [[pmip3:​design:​plio:​index|Plio]] ]
  
  
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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°** = 100.327° ] or same as Pre-Ind CMIP5 control |  +|  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) ([[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>​** =  ]  | 
 |  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 Shindell) ​ |  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, 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 ​ |+|  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 ​ |
 |  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 ​  ​| ​   |
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 ==== Orbital forcing ==== ==== Orbital forcing ====
  
-Calculation from Berger (1978)annually varying. +The following orbital parameters parameters should be usedif 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+
  
-OBL = 23.697   - 0.000128*Year+Note: calculation from Berger (1978), annually varying.
  
-PERI-18068.79   + 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 14:38 by jypeter