pmip3:wg:degla:bc:ghg
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pmip3:wg:degla:bc:ghg [2015/10/21 13:40] ruza |
pmip3:wg:degla:bc:ghg [2015/10/21 13:42] (current) ruza |
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| * **RESOLVED** With the new AICC2012<sup>[2]</sup> age model, the LGM values for CO<sub>2</sub><sup>[1]</sup> and CH<sub>4</sub><sup>[4]</sup> are inaccurate, as can be seen from the plots above. Do we need a new PMIP LGM definition for these greenhouse gases in accordance with the records? **DECISION (Oct 2015): We have used the new, up to date CO<sub>2</sub> (188 ppm) and CH<sub>4</sub> (375 ppb) values for our LGM equilibrium-type 21 ka spinup. We do not know what the LGM group's decision will be.**\\ \\ | * **RESOLVED** With the new AICC2012<sup>[2]</sup> age model, the LGM values for CO<sub>2</sub><sup>[1]</sup> and CH<sub>4</sub><sup>[4]</sup> are inaccurate, as can be seen from the plots above. Do we need a new PMIP LGM definition for these greenhouse gases in accordance with the records? **DECISION (Oct 2015): We have used the new, up to date CO<sub>2</sub> (188 ppm) and CH<sub>4</sub> (375 ppb) values for our LGM equilibrium-type 21 ka spinup. We do not know what the LGM group's decision will be.**\\ \\ | ||
| * **RESOLVED** N<sub>2</sub>O<sup>[1]</sup> values take a dive in the lead up to 21 ka. The PMIP3 value of 200 ppb looks fairly representative of the LGM state, even though this is a bit higher than the actual 21 ka value. We recommend that groups spin-up with 200 ppb N<sub>2</sub>O, and begin the transient simulation from 21 ka in the record (as shown in the plot above). **DECISION (Oct 2015): We have stuck with the old, more representative N<sub>2</sub>O value of 200 ppb. However, the transient 'spinup' 26-21 ka and the transient run (21-9 ka) should use the chronologically accurate values, as plotted above. We do not know what the LGM group's decision will be.** \\ \\ | * **RESOLVED** N<sub>2</sub>O<sup>[1]</sup> values take a dive in the lead up to 21 ka. The PMIP3 value of 200 ppb looks fairly representative of the LGM state, even though this is a bit higher than the actual 21 ka value. We recommend that groups spin-up with 200 ppb N<sub>2</sub>O, and begin the transient simulation from 21 ka in the record (as shown in the plot above). **DECISION (Oct 2015): We have stuck with the old, more representative N<sub>2</sub>O value of 200 ppb. However, the transient 'spinup' 26-21 ka and the transient run (21-9 ka) should use the chronologically accurate values, as plotted above. We do not know what the LGM group's decision will be.** \\ \\ | ||
| - | * **RESOLVED** Should the core experiment use the [[http://www.nature.com/nature/journal/v514/n7524/full/nature13799.html | Marcott et al. (2014)]]<sup>[3]</sup> CO<sub>2</sub> records? \\ For example, these newer data are higher resolution than [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1]</sup>, but are restricted to 23-9 ka. Therefore more consistency may be be gained from using the older [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1]</sup> CO<sub>2</sub> records, if longer simulations are planned by groups. Also, CH<sub>4</sub> and N<sub>2</sub>O data are not yet available in such high resolution. **DECISION (Oct 2015): We have chosen to use the older data from [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1].** \\ \\\\ \\ | + | * **RESOLVED** Should the core experiment use the [[http://www.nature.com/nature/journal/v514/n7524/full/nature13799.html | Marcott et al. (2014)]]<sup>[3]</sup> CO<sub>2</sub> records? \\ For example, these newer data are higher resolution than [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1]</sup>, but are restricted to 23-9 ka. Therefore more consistency may be be gained from using the older [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1]</sup> CO<sub>2</sub> records, if longer simulations are planned by groups. Also, CH<sub>4</sub> and N<sub>2</sub>O data are not yet available in such high resolution. **DECISION (Oct 2015): We have chosen to use the older data from [[http://www.nature.com/nature/journal/v453/n7193/full/nature06949.html | Lüthi et al. (2008)]]<sup>[1]</sup>.** \\ \\ |
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pmip3/wg/degla/bc/ghg.1445434847.txt.gz · Last modified: 2015/10/21 13:40 by ruza
