Paper: Farnsworth et al 2019b

Title: Past East Asian monsoon evolution controlled by paleogeography, not CO2

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

There are two sets of simulations at 4x and 2x CO2, through the Cretaceous-Paleocene-Eocene. In addition for the modern -Gelasian- there are simulations at 1x and 2x CO2.

You can have make you own analysis and plots by going here

Simulation Name as in PaperSimulation name on web pages
Pre-Industrial 1xtdzvg
Gelasian 1xtdqpr
Piacenzian 400ppmtdqpq
Zanclean 400ppmtdqpp
Messinian 400ppmtdqpo
Tortonian 400ppmtdqpn
Serravallian 400ppmtdqpm
Langhian 400ppmtdqpl
Burdigalian 400ppmtdqpk
Aquitanian 400ppmtdqpj
Chattian 2xtdluq
Rupelian 2xtdlup
Priabonian 4xtdluk
Bartonian 4xtdluj
Lutetian 4xtdlur
Ypresian 4xtdlud
Thanetian 4xtdluc
Selandian 4xtdlub
Danian 4xtdlua
Maastrichtian 4xtdihb
Campanian 4xtdpwc
Santonian 4xtdpwd
Coniacian 4xtdpwe
Turonian 4xtdpwf
Cenomanian 4xtdpwg
Albian 4xtdpwh
Aptian 4xtdpwi
Barremian 4xtdpwj
Hauterivian 4xtdpwk
Valanginian 4xtdpwl
Berriasian 4xtdihm
Gelasian 2xtdqpy
Serravallian 2xtdqpn
Langhian 2xteiam
Chattian 4xteial
Rupelian 4xtdlux
Bartonian 2xtdlul
Ypresian 2xtdwjf
Maastrichtian 2xtdwjd
Campanian 2xtdzeb
Santonian 2xtdzec
Cenomanian 2xtdzed
Aptian 2xtdzeg
Hauterivian 2xtdzei
Berriasian 2xtdzek
Pliocene Robo 2xtdzem
Chattian Robo 2xteckg
Maastrichtian Robo 2xxnzqa
Turonian Robo 2xtecko
Albian Robo 4xtecks
Valanginian Robo 840ppm


This is a fuller description of paper

Climate sensitivity on geological timescales depends on continental configuration. Ocean area and ocean circulation non-linearly determine climate and climate sensitivity. Past climate sensitivity is not necessarily a good analogue for future climate sensitivity

NameFarnsworth et alb
Brief DescriptionClimate sensitivity on geological timescales depends on continental configuration. Ocean area and ocean circulation non-linearly determine climate and climate sensitivity. Past climate sensitivity is not necessarily a good analogue for future climate sensitivity
Full Author ListA. Farnsworth, D.J. Lunt, S. Ronbinson, P.J. Valdes, W.H. Roberts, P. Markwick, T. Su, N. Wrobel, F. Bragg, S-J, Kelland, R.D. Pancost
TitlePast East Asian monsoon evolution controlled by paleogeography, not CO2
Year2019
JournalGeophysical Research Letters
Volume5
Issue
Pages
DOI10.1126/sciadv.aax1697
Contact's NameAlex Farnsworth
Contact's emailalex.farnsworth@bristol.ac.uk
AbstractClimate sensitivity is a key metric used to assess the magnitude of global warming given increased CO2 concentrations. The geological past can provide insights into climate sensitivity; however, on timescales of millions of years, factors other than CO2 can drive climate, including paleogeographic forcing and solar luminosity. Here, through an ensemble of climate model simulations covering the period 150-35 million years ago, we show that climate sensitivity to CO2 doubling varies between 3.5-5.5 °C through this time. These variations can be explained as a non-linear response to solar luminosity, evolving surface albedo due to changes in ocean area, and changes in ocean circulation. The work shows that the modern climate sensitivity is relatively low in the context of the geological record, as a result of relatively weak feedbacks due to a relatively low CO2 baseline, and the presence of ice and relatively small ocean area in the modern continental configuration.