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author = "Valdes, PJ"
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Found 12 documents, displaying page 1 of 2

A review of palaeoclimates and palaeoenvironments in the Levant and Eastern Mediterranean from 25,000 to 5000 years BP: setting the environmental background for the evolution of human civilisation

Author(s) : ROBINSON, S , Black, S , Sellwood, B , Valdes, PJ
Description :
Repository : UCL Eprints
Language(s) : Undetermined

Oceanic gateways as a critical factor to initiate icehouse Earth using simple GCMs for pre-Cenozoic world (Papaer Number OS21A-0188)

Author(s) : Pickering, KT , Smith, AG , Valdes, PJ
Description :
Repository : UCL Eprints
Language(s) : Undetermined

The PEG-BOARD project: a case study for BRIDGE

Author(s) : Tourte, GJL , Tonkin, EL , Valdes, PJ
Description : With increasing public interest in the area of historical climate change and in models of climate change in general, comes a corresponding increase in the importance of maintaining open, accessible and usable research data repositories. In this paper, we introduce an e-Science data repository contai...
Repository : Bristol Repository of Scholarly Eprints (ROSE)
Language(s) : English

Modelling late Oligocene C-4 grasses and climate

Author(s) : Lunt, DJ , Ross, I , Hopley, PJ , Valdes, PJ
Description : Evidence suggests that C-4 grasses, adapted to conditions of low CO,, high temperatures, and water-stressed environments, expanded relatively quickly, and in several geographically distinct regions, during the Late Miocene (approximately 9-7 Ma). Using a variety of modelling tools, we attempt to exp...
Repository : UCL Eprints
Language(s) : Undetermined

A review of palaeoclimates in the Levant and Eastern Mediterranean from 25,000 to 5,000 years BP: setting the environmental background for the evolution of human civilisation

Author(s) : Robinson, SA , Black, S , Sellwood, B , Valdes, PJ
Description :
Repository : UCL Eprints
Language(s) : Undetermined

Parameter estimation in an atmospheric GCM using the Ensemble Kalman Filter

Author(s) : Annan, JD , Lunt, DJ , Hargreaves, JC , Valdes, PJ
Description : We demonstrate the application of an efficient multivariate probabilistic parameter estimation method to a spectral primitive equation atmospheric GCM. The method, which is based on the Ensemble Kalman Filter, is effective at tuning the surface air temperature climatology of the model to both identi...
Repository : Bristol Repository of Scholarly Eprints (ROSE)
Language(s) : English

Comparing transient, accelerated, and equilibrium simulations of the last 30 000 years with the GENIE-1 model

Author(s) : Lunt, DJ , Williamson, MS , Valdes, PJ , Lenton, TM , Marsh, R
Description : We examine several aspects of the ocean-atmosphere system over the last 30 000 years, by carrying out simulations with prescribed ice sheets, atmospheric CO2 concentration, and orbital parameters. We use the GENIE-1 model with a frictional geostrophic ocean, dynamic sea ice, an energy balance atmosp...
Repository : Bristol Repository of Scholarly Eprints (ROSE)
Language(s) : English

A Palaeogene perspective on climate sensitivity and methane hydrate instability

Author(s) : Dunkley Jones, T , Ridgwell, A , Lunt, DJ , Maslin, MA , Schmidt, DN , Valdes, PJ
Description : The Palaeocene-Eocene thermal maximum (PETM), a rapid global warming event and carbon-cycle perturbation of the early Palaeogene, provides a unique test of climate and carbon-cycle models as well as our understanding of sedimentary methane hydrate stability, albeit under conditions very different fr...
Repository : UCL Eprints
Language(s) : Undetermined

Late Pleistocene climate change and the global expansion of anatomically modern humans.

Author(s) : Eriksson, A , Betti, L , Friend, AD , Lycett, SJ , Singarayer, JS , von Cramon-Taubadel, N , Valdes, PJ , Balloux, F , Manica, A
Description : The extent to which past climate change has dictated the pattern and timing of the out-of-Africa expansion by anatomically modern humans is currently unclear [Stewart JR, Stringer CB (2012) Science 335:1317-1321]. In particular, the incompleteness of the fossil record makes it difficult to quantify ...
Repository : UCL Eprints
Language(s) : English

CO2-driven ocean circulation changes as an amplifier of Paleocene-Eocene thermal maximum hydrate destabilization

Author(s) : Lunt, DJ , Valdes, PJ , Dunkley Jones, T , Ridgwell, A , Haywood, AM , Schmidt, DN , Marsh, R , Maslin, M
Description : Changes in ocean circulation have been proposed as a trigger mechanism for the large coupled climate and carbon cycle perturbations at the Paleocene-Eocene Thermal Maximum (PETM, ca. 55 Ma). An abrupt warming of oceanic intermediate waters could have initiated the thermal destabilization of sediment...
Repository : UCL Eprints
Language(s) : Undetermined
1 2 > >>

Found 12 documents, displaying page 1 of 2