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pmip3:design:lm:index [2009/05/28 16:27] jypeter Added TSI Info for Johann Jungclaus |
pmip3:design:lm:index [2009/08/04 12:46] jypeter Added link to GHG evolution table |
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<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>**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> | ||
- | ===== Boundary conditions ===== | + | 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. |
+ | ===== Boundary conditions ===== | ||
==== Summary of Last Millennium boundary conditions ==== | ==== Summary of Last Millennium boundary conditions ==== | ||
^ ^ PMIP3 ^ Alternative solution ^ | ^ ^ PMIP3 ^ Alternative solution ^ | ||
- | | Orbital parameters | [ **ecc** = ] - [ **obl** = ° ] - [ **peri-180°** = ° ] | | | + | | 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°** = ° ] | |
- | | Date of vernal equinox | | | | + | | Date of vernal equinox | Mar 21 hr 0 | same as CMIP5 control | |
- | | Trace gases | [ **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) (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>** = ] | |
- | | Aerosols | | | | + | | Volcanic Aerosols | Multiple reconstructions (of AOD, Effective Radius, Mass) | | |
- | | | | | | + | | Solar irradiance | Multiple reconstructions (default TBD) | | |
- | | Solar constant | W/m<sup>2</sup> | | | + | | Ozone | solar related variations (parameterised as function of change in solar irradiance - Drew Shindell) | same as pre-Ind control | |
- | | Vegetation | | | | + | | Aerosols | biomass burning changes???? | same as pre-Ind control | |
- | | Ice sheets | | | | + | | 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 | |
- | | Topography and coastlines | | | | + | | Ice sheets | No changes 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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Millennium simulations (black curve), a 11 year cycle was added for consistency over the | Millennium simulations (black curve), a 11 year cycle was added for consistency over the | ||
entire period. | entire period. | ||
+ | |||
+ | Notes: We will impose an 11 year cycle on pre-sunspot reconstructions for consistency of the spectrum of natural variability. Additionally, we will give a spectral set of irradiance changes based on modern variability observed by satellite (Lean). | ||
+ | |||
+ | Candidate reconstructions: Krivova, Steinhilber, new Bard?, (TBD) | ||
+ | |||
+ | ==== Volcanic Forcings ==== | ||
+ | |||
+ | Issues: compatability of eff. rad, zonality, height distribution with modern satellite (Sato) data. | ||
+ | |||
+ | 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. | ||
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