For a fuller description of the paper itself, go to the end of this web page.
Each simulation published in this paper corresponds to a unique 5 or 6 character code on the web pages.
The following table lists the name of the simulation as used in the paper, and the corresponding code name
The webpage gives you the ability to examine the published simulations, but you can also download the raw (netcdf) files to perform your own analysis. Detailed instructions on how to use the webpages and access the data can be found here: Using_BRIDGE_webpages.pdf
You can have make you own analysis and plots by going here
| Simulation Name as in Paper | Simulation name on web pages |
|---|---|
| PI emissions-driven | xkzxv |
| LGM emissions-driven | xkzxw |
| PI concentration-driven | xllvh |
| LGM concentration-driven: low fire | xllvi |
| LGM concentration-driven: standard fire | xllvj |
| LGM concentration-driven: standard + LGM hunter-gatherers fire | xllvk |
| PI concentration-driven: dynamic photolysis | xllvn |
| LGM concentration-driven: dynamic photolysis | xllvo |
| LGM concentration-driven: dynamic photolysis: +3% stratospheric O3 | xllvo |
| LGM concentration-driven: dynamic photolysis: Murray et al (2013) warm-LGM stratospheric O3 | xllvy |
| LGM with PI non-wetland fluxes | xkzxt |
| LGM with PI lightning | xkzxu |
| LGM with PI climate | xllve |
This paperincludes a set of simulations with HadGEM2-ES with an interactive methane cycle looking at the natural change in methane from 375ppbv during the Last Glacial Maximum (LGM) to 680ppbv during the late Holocene pre-industrial.
| Name | Hopcroft et al |
|---|---|
| Brief Description | This paperincludes a set of simulations with HadGEM2-ES with an interactive methane cycle looking at the natural change in methane from 375ppbv during the Last Glacial Maximum (LGM) to 680ppbv during the late Holocene pre-industrial. |
| Full Author List | Peter O. Hopcroft, Paul J. Valdes, Fiona O'Connor, Jed Kaplan and David Beerling |
| Title | Understanding the glacial methane cycle |
| Year | 2017 |
| Journal | Nature Communications |
| Volume | 8 |
| Issue | |
| Pages | 14383 |
| DOI | 10.1038/ncomms14383 |
| Contact's Name | Peter O. Hopcroft |
| Contact's email | peter.hopcroft@bristol.ac.uk |
| Abstract | Atmospheric methane (CH4) varied with climate during the Quaternary, rising from a concentration of 375?p.p.b.v. during the last glacial maximum (LGM) 21,000 years ago, to 680?p.p.b.v. at the beginning of the industrial revolution. However, the causes of this increase remain unclear; proposed hypotheses rely on fluctuations in either the magnitude of CH4 sources or CH4 atmospheric lifetime, or both. Here we use an Earth System model to provide a comprehensive assessment of these competing hypotheses, including estimates of uncertainty. We show that in this model, the global LGM CH4 source was reduced by 28?46%, and the lifetime increased by 2?8%, with a best-estimate LGM CH4 concentration of 463?480?p.p.b.v. Simulating the observed LGM concentration requires a 46?49% reduction in sources, indicating that we cannot reconcile the observed amplitude. This highlights the need for better understanding of the effects of low CO2 and cooler climate on wetlands and other natural CH4 sources. |