Introduction, and history of Eocene modelling Atmosphere-Ocean coupled models ‘EoMIP’ Solutions? – sensitivities to uncertainties Modelling Eocene Climates:

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Presentation transcript:

Introduction, and history of Eocene modelling Atmosphere-Ocean coupled models ‘EoMIP’ Solutions? – sensitivities to uncertainties Modelling Eocene Climates: Can any model get it ‘right’?! Dan Lunt M. Heinemann, M. Huber, A. Legrande, A. Ridgwell, P. Valdes, A. Winguth

Zachos et al, Nature, 2001 Orientation…

Bijl et al., Nature 2009 Reduced latitudinal temperature gradients compared to modern… ‘Warm’ mid-high latitudes also supported by a wealth of terrestrial evidence, e.g. Croccodillians, pollen data, etc. BUT…. ‘early’ models, e.g. Huber and Sloan, Bice, etc etc. UNABLE to reproduce, given palaeogeography and CO2 changes. Is this still the case in 2010?!

General Circulation Models (GCMs)

History of GCMs

Surface Temperature: observations Surface Temperature: HadCM3 How good are GCMs? (1) temperature

Precipitation: observations Precipitation: HadCM3 Seaice: observations vs models How good are GCMs? (2) Precip and seaice

Topography Veg Eocene: boundary conditions (1) Palaeogeography

Eocene: boundary conditions (2) CO2 Zachos et al, Nature, 2008

Eocene Model Intercomparison Project (‘EoMIP’) results

Lunt et al, Geology, 2010 Heinemann et al, Climate of the Past, 2009 Winguth et al, Journal of Climate, 2010 Huber et al, PPP, 2006 Roberts et al, EPSL, 2009 Panchuk et al, Geology, 2008

New SST/terrestrial data compilation soon, led by Tom Dunkley Jones

ppmv What are the reasons for the differences…?

Boundary conditions: 2 x CO 2 0.4% decrease in solar constant palaeogeography uniform vegetation/soil everything else modern Sensitivity to uncertainties: (1) Internal model parameters and clouds

“Control” climate (after 1000 years):

Perform 100 simulations for the Eocene, varying some key model parameters. Do any of these simulations result in a good (i.e. warm pole) simulation? Select 10 poorly defined parameters Select reasonable possible ranges for each parameter Vary them together (using a ‘latin-hypercube’ sampling method) Clouds:  Threshold of relative humidity for cloud formation (RHcrit)  Precipitation ice fall out speed (VF1)  Conversion rate of cloud liquid water droplets to precipitation (CT)  Threshold value of cloud liquid water for formation of precip. (CW) Convection : Convective roughness length over the sea (Z0FSEA) Gravity wave parameters (WAVE) Sea ice low albedo (ALPHAM) Diffusion in ocean and atmosphere

100 simulations performed, each simulation set for 1000 years. –59 simulations failed within 100 years! –4 further simulations failed to complete 1000 years. –Hence only 37 simulations completed to 1000 years. Of these, 19 failed to complete 4000 years But 18 have completed 10,000 years

Sensitivity uncertainties: (2) Effects of Open Arctic: Change in climate due to opening Arctic connections to rest of ocean DJF JJAANN See also Roberts et al, 2009, EPSL

Change in surface air temperature due to orbital parameter changes Orbital parameters similar to 9kyr BPObliquity = 25.5 o (c.f o ) Sensitivity to uncertainties: (3) Orbits:

EoMIP – comparison of ‘current’ Eocene model simulations ‘State of the art’ models still unable to reproduce Eocene climates Model uncertainty, Arctic gateways and orbital variations could combine to reconcile models and data ……What about issues with the data??!

Warm Climates of the Past – a lesson for the future? October 2011 The Royal Society, London