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pmip3:design:lm:index [2009/09/12 01:30]
gavin
pmip3:design:lm:index [2010/09/16 14:38] (current)
jypeter Added link to final BC page in the top warning
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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]] ]
  
  
 ====== Last Millennium Experimental Design ====== ====== Last Millennium Experimental Design ======
  
-<note warning>**Page in progress**: this is not the final version!\\ \\ Use the [[index#​page_bottom_tag|discussion]] panel at the end of the page for comments ​</​note>​+<note warning>This was a BC //​development page// (see [[index#​page_bottom_tag|discussion]] panel at the end of the page)\\ \\ Make sure you use the [[pmip3:​design:​lm:​final|final version of the LM BC]]!</​note>​
  
 The basic principle is that we should strive to include all relevant transient forcings over this period if the functionality exists in the model, noting that conformability with the CMIP5 controls and 20th Century transient is crucial. ​ The basic principle is that we should strive to include all relevant transient forcings over this period if the functionality exists in the model, noting that conformability with the CMIP5 controls and 20th Century transient is crucial. ​
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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\\ [[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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 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. 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.1252711828.txt.gz · Last modified: 2009/09/12 01:30 by gavin