pmip3:wg:degla:bc:core
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pmip3:wg:degla:bc:core [2015/02/17 14:11] – ruza | pmip3:wg:degla:bc:core [2025/05/15 18:00] (current) – jypeter | ||
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/* Uncomment the following ~~DISCUSSION~~ line if you want to | /* Uncomment the following ~~DISCUSSION~~ line if you want to | ||
allow users (including users who have NO write access to the page) to discuss | allow users (including users who have NO write access to the page) to discuss | ||
the content of the page | the content of the page | ||
More info here: http:// | More info here: http:// | ||
- | |||
- | /* ~~DISCUSSION|Discussion on core experiment design~~ * | ||
====== Last Deglaciation Core Experiment Design ====== | ====== Last Deglaciation Core Experiment Design ====== | ||
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[[pmip3: | [[pmip3: | ||
- | Please note this page is a work in progress and is not ready for discussion yet. | ||
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===== Proposal ===== | ===== Proposal ===== | ||
- | Following wide consultation | + | Following wide consultation, |
+ | [[http:// | ||
+ | \\ | ||
+ | To make sure we incorporate your comments in the final, published experiment design, please use GMD's [[http:// | ||
- | ==== 21-9 ka ==== | + | The published version of the experiment design is/will be the definitive version and supersedes any differences on this wiki. Data will be available to download from this wiki when the manuscript is accepted in its final state. |
- | All core simulations must span this time-period. Use: | + | Please use the // |
+ | \\ | ||
+ | There are also the following dedicated pages: | ||
+ | * [[pmip3: | ||
+ | * [[pmip3: | ||
+ | * [[pmip3: | ||
+ | * [[pmip3: | ||
- | * A **spun-up LGM** climate simulation to initialise the simulation.\\ This should have been set up as per the Last Glacial Maximum (LGM) working group requirements and recommendations. | ||
- | * **Orbital parameters** as per [[http:// | ||
- | * **Greenhouse gases**: | ||
- | * **CO< | ||
- | * **CH< | ||
- | * **N< | ||
- | * Choice of either ICE6G_C< | ||
- | * Meltwater: **__no meltwater__** in the core. ((Global meltwater fluxes that are consistent with the ice sheet reconstructions will be provided for alternative simulations to the core, but must not be used for the core.)) \\ \\ | ||
- | ==== 26-21 ka ==== | ||
- | For those who wish to begin their simulation from before the PMIP LGM, use: | + | ==== Transient simulation 21-9 ka ==== |
- | * Orbit as per [[http://www.sciencedirect.com/science/article/pii/027737919190033Q | + | |
- | * All other boundary conditions as per the PMIP LGM Working Group. \\ \\ | + | All core simulations must span this time-period. Note that forcings provided will run 21-0 ka. \\ |
+ | Please use: | ||
+ | |||
+ | * An **equilibrium-type LGM** climate simulation to initialise the transient simulation, OR a **transient 26-21 ka LGM ** simulation. See below. | ||
+ | * **[[pmip3: | ||
+ | * **[[pmip3: | ||
+ | * **CO< | ||
+ | * **CH< | ||
+ | * **N< | ||
+ | * **[[pmip3: | ||
+ | * **[[pmip3: | ||
+ | * Other boundary conditions: keep as per the LGM. For example : | ||
+ | * Vegetation can be fixed (to pre-industrial) or interactive | ||
+ | * Dust can be fixed (to pre-industrial) or prognostic \\ \\ | ||
+ | |||
+ | ==== Equilibrium-type LGM 21 ka ==== | ||
+ | |||
+ | In some cases, the following constraints may differ from other PMIP 21 ka experiments. If possible, please make sure you use the setup described here: | ||
+ | * Orbital parameters: | ||
+ | * eccentricity: | ||
+ | * obliquity: 22.949° | ||
+ | * perihelion–180°: | ||
+ | * vernal equinox: 21st March at noon | ||
+ | * Solar constant: same as for the preindustrial (e.g. 1365 W/m2) | ||
+ | * Trace gases: | ||
+ | * CO2: 188 ppm | ||
+ | * CH4: 375 ppb | ||
+ | * N2O: 200 ppb | ||
+ | * CFCs: 0 | ||
+ | * O3: same as PMIP3/CMIP5 preindustrial (e.g. 10 DU) | ||
+ | * Ice sheets: [[pmip3: | ||
+ | * Topography and coastlines: as per the chosen ice sheet. Please ensure that rivers reach the ocean. | ||
+ | * Bathymetry: Optional. If possible, as per the chosen ice sheet. Otherwise, up to the user to decide. | ||
+ | * Global ocean salinity: +1 psu | ||
+ | * Freshwater budget: Please note the PMIP LGM advice to try to avoid unnecessary ocean salinity drifts. You may need to route excess snow to the ocean. | ||
+ | * Other boundary conditions: consistent with the Core\\ \\ | ||
+ | |||
+ | ==== 26-21 ka LGM ==== | ||
+ | |||
+ | For those who wish to begin their simulation from before the PMIP LGM, use the following transient data: | ||
+ | * Orbit as per [[http://journals.ametsoc.org/doi/abs/10.1175/1520-0469%281978%29035%3C2362%3ALTVODI%3E2.0.CO%3B2 | ||
+ | * Greenhouse gases as per [[http:// | ||
+ | * All other boundary conditions as per the // | ||
---- | ---- | ||
- | ===== Some points | + | ===== Points |
Please think about the following points and add any comments on these or any other aspects of the experiment design to the discussion section below: [Topics will be added here as they are raised below or by email.] | Please think about the following points and add any comments on these or any other aspects of the experiment design to the discussion section below: [Topics will be added here as they are raised below or by email.] | ||
- | * Should the core experiment use the [[http:// | + | * No specific points |
---- | ---- | ||
- | ====References==== | + | ===== References |
- | - Berger, A. & Loutre, M. F. Insolation values for the climate | + | - Berger, A. Long-Term Variations |
- Lüthi, D. et al. High-resolution carbon dioxide concentration record 650, | - Lüthi, D. et al. High-resolution carbon dioxide concentration record 650, | ||
- | - Loulergue, L. et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800, | ||
- Veres, D. et al. The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years. Clim Past 9, 1733–1748 (2013). | - Veres, D. et al. The Antarctic ice core chronology (AICC2012): an optimized multi-parameter and multi-site dating approach for the last 120 thousand years. Clim Past 9, 1733–1748 (2013). | ||
- Marcott, S. A. et al. Centennial-scale changes in the global carbon cycle during the last deglaciation. Nature 514, 616–619 (2014). | - Marcott, S. A. et al. Centennial-scale changes in the global carbon cycle during the last deglaciation. Nature 514, 616–619 (2014). | ||
- | - Sowers, T., Alley, R. B. & Jubenville, J. Ice Core Records of Atmospheric | + | - Loulergue, L. et al. Orbital and millennial-scale features of atmospheric CH4 over the past 800,000 years. Nature 453, 383–386 (2008). |
+ | - Schilt, A. et al. Atmospheric | ||
- Argus, D. F., Peltier, W. R., Drummond, R. & Moore, A. W. The Antarctica component of postglacial rebound model ICE-6G_C (VM5a) based on GPS positioning, | - Argus, D. F., Peltier, W. R., Drummond, R. & Moore, A. W. The Antarctica component of postglacial rebound model ICE-6G_C (VM5a) based on GPS positioning, | ||
- | - Peltier, W. R., Argus, D. F. & Drummond, R. Space geodesy constrains ice age terminal deglaciation: | + | - Peltier, W. R., Argus, D. F. & Drummond, R. Space geodesy constrains ice age terminal deglaciation: |
+ | - Tarasov, L. & Peltier, W. R. Greenland glacial history and local geodynamic consequences. Geophys. J. Int. 150, 198–229 (2002). | ||
+ | - Tarasov, L., Dyke, A. S., Neal, R. M. & Peltier, W. R. A data-calibrated distribution of deglacial chronologies for the North American ice complex from glaciological modeling. Earth Planet. Sci. Lett. 315–316, 30–40 (2012) | ||
+ | - Briggs, R. D., Pollard, D. & Tarasov, L. A data-constrained large ensemble analysis of Antarctic evolution since the Eemian. Quat. Sci. Rev. 103, 91–115 (2014). | ||
+ | - Tarasov et al. Eurasian ice sheet evolution (in prep.).\\ \\ | ||
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pmip3/wg/degla/bc/core.1424178663.txt.gz · Last modified: 2015/02/17 14:11 by ruza