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pmip3:design:lm:index [2009/07/09 23:31]
ammann
pmip3:design:lm:index [2009/09/17 08:31]
jypeter Added link to orbital parameters' table, and cosmetic changes
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 ^      ^   ​PMIP3 ​ ^  Alternative solution ​ ^ ^      ^   ​PMIP3 ​ ^  Alternative solution ​ ^
-|  Orbital parameters ​ |  Annually varying (850-1850|  1850 values or same 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 ​ |  
-|                |   Table provided ​if not internally calculated |[ **ecc** =  [ **obl** = ° [ **peri-180°** = ° ]  |  +|  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) | constant at CMIP5 control levels ​|  +|  Volcanic Aerosols ​ |  Multiple reconstructions (of AOD, Effective Radius, Mass)  |   ​|
-|               ​| ​ Table provided | [ **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)  | +
-|    | |  ​|+
 |  Solar irradiance ​ |  Multiple reconstructions (default TBD)  |    | |  Solar irradiance ​ |  Multiple reconstructions (default TBD)  |    |
-|   ​Ozone ​   |  solar related variations????  | 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 (URL?​) ​  ​| ​  |+
 |  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