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--- pmip3:design:lm:index [2009/07/10 01:31] – ammann
+++ pmip3:design:lm:index [2010/09/16 14:38] (current) – Added link to final BC page in the top warning jypeter
@@ Line 1: / Line 1: @@
 ~~ODT~~
-~~DISCUSSION~~
+~~DISCUSSION:closed~~
 <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 ======
-<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.
@@ Line 16: / Line 16: @@
 ^      ^   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)  |    |
-|   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  |    |
-|  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!
@@ Line 58: / Line 54: @@
 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 |