Search Results - "Valdes, Paul"

Paleoclimate-conditioning reveals a North Africa land–atmosphere tipping point by Hopcroft, Peter O., Valdes, Paul J.

“…While paleoclimate records show that the Earth System is characterized by several different tipping points, their representation within Earth System models…”
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Asteroid impact, not volcanism, caused the end-Cretaceous dinosaur extinction by Chiarenza, Alfio Alessandro, Farnsworth, Alexander, Mannion, Philip D., Luntc, Daniel J., Valdes, Paul J., Morgan, Joanna V., Allison, Peter A.

“…The Cretaceous/Paleogene mass extinction, 66 Ma, included the demise of non-avian dinosaurs. Intense debate has focused on the relative roles of Deccan…”
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On the Role of Dust‐Climate Feedbacks During the Mid‐Holocene by Hopcroft, Peter O., Valdes, Paul J.

“…A reduction in dust over North Africa during the mid‐Holocene “Green Sahara” period could have amplified precipitation, helping reconcile climate model…”
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Multiple causes of the Younger Dryas cold period by Renssen, Hans, Mairesse, Aurélien, Goosse, Hugues, Mathiot, Pierre, Heiri, Oliver, Roche, Didier M., Nisancioglu, Kerim H., Valdes, Paul J.

“…The last deglaciation was interrupted by a cool period known as the Younger Dryas. Numerical simulations suggest that the cold interval was the result of a…”
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North African humid periods over the past 800,000 years by Armstrong, Edward, Tallavaara, Miikka, Hopcroft, Peter O., Valdes, Paul J.

“…The Sahara region has experienced periodic wet periods over the Quaternary and beyond. These North African Humid Periods (NAHPs) are astronomically paced by…”
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Eocene greenhouse climate revealed by coupled clumped isotope-Mg/Ca thermometry by Evans, David, Sagoo, Navjit, Renema, Willem, Cotton, Laura J., Müller, Wolfgang, Todd, Jonathan A., Saraswati, Pratul Kumar, Stassen, Peter, Ziegler, Martin, Pearson, Paul N., Valdes, Paul J., Affek, Hagit P.

“…Past greenhouse periods with elevated atmospheric CO₂ were characterized by globally warmer sea-surface temperatures (SST). However, the extent to which the…”
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Why ‘the uplift of the Tibetan Plateau’ is a myth by Spicer, Robert A, Su, Tao, Valdes, Paul J, Farnsworth, Alexander, Wu, Fei-Xiang, Shi, Gongle, Spicer, Teresa E V, Zhou, Zhekun

“…Abstract The often-used phrase ‘the uplift of the Tibetan Plateau’ implies a flat-surfaced Tibet rose as a coherent entity, and that uplift was driven entirely…”
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Deglacial rapid sea level rises caused by ice-sheet saddle collapses by Gregoire, Lauren J., Payne, Antony J., Valdes, Paul J.

“…A simulation of ice sheet retreat reveals two meltwater pulses coinciding with MWP-1A and the ‘8,200-year’ event, caused by saddle collapses between ice domes…”
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Climate model and proxy data constraints on ocean warming across the Paleocene–Eocene Thermal Maximum by Dunkley Jones, Tom, Lunt, Daniel J., Schmidt, Daniela N., Ridgwell, Andy, Sluijs, Appy, Valdes, Paul J., Maslin, Mark

“…Constraining the greenhouse gas forcing, climatic warming and estimates of climate sensitivity across ancient large transient warming events is a major…”
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Deep ocean temperatures through time by Valdes, Paul J, Scotese, Christopher R, Lunt, Daniel J

“…Benthic oxygen isotope records are commonly used as a proxy for global mean surface temperatures during the Late Cretaceous and Cenozoic, and the resulting…”
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Wind‐Driven Evolution of the North Pacific Subpolar Gyre Over the Last Deglaciation by Gray, William R., Wills, Robert C. J., Rae, James W. B., Burke, Andrea, Ivanovic, Ruza F., Roberts, William H. G., Ferreira, David, Valdes, Paul J.

“…North Pacific atmospheric and oceanic circulations are key missing pieces in our understanding of the reorganization of the global climate system since the…”
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High-latitude climate sensitivity to ice-sheet forcing over the last 120 kyr by Singarayer, Joy S., Valdes, Paul J.

“…Interpretation of ice-core records is currently limited by paucity of modelling at adequate temporal and spatial resolutions. Several key questions relate to…”
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Abrupt Bølling warming and ice saddle collapse contributions to the Meltwater Pulse 1a rapid sea level rise by Gregoire, Lauren J., Otto‐Bliesner, Bette, Valdes, Paul J., Ivanovic, Ruza

“…Elucidating the source(s) of Meltwater Pulse 1a, the largest rapid sea level rise caused by ice melt (14–18 m in less than 340 years, 14,600 years ago), is…”
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Sensitivity of the Tropical Dust Cycle to Glacial Abrupt Climate Changes by Hopcroft, Peter O., Pichat, Sylvain, Valdes, Paul J., Kienast, Stephanie S.

“…During abrupt climate changes of the last glacial period paleorecords show large amplitude changes in the dust cycle. We use Earth System model simulations to…”
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Using the Mid‐Holocene “Greening” of the Sahara to Narrow Acceptable Ranges on Climate Model Parameters by Hopcroft, Peter O., Valdes, Paul J., Ingram, William

“…During the early to mid‐Holocene vegetation expanded to cover much of the present‐day Sahara. Although driven by a well‐understood difference in the orbital…”
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Late Quaternary climate legacies in contemporary plant functional composition by Blonder, Benjamin, Enquist, Brian J., Graae, Bente J., Kattge, Jens, Maitner, Brian S., Morueta‐Holme, Naia, Ordonez, Alejandro, Šímová, Irena, Singarayer, Joy, Svenning, Jens‐Christian, Valdes, Paul J., Violle, Cyrille

“…The functional composition of plant communities is commonly thought to be determined by contemporary climate. However, if rates of climate‐driven immigration…”
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Evidence for the impact of the 8.2-kyBP climate event on Near Eastern early farmers by Roffet-Salque, Mélanie, Marciniak, Arkadiusz, Valdes, Paul J., Pawłowska, Kamilla, Pyzel, Joanna, Czerniak, Lech, Krüger, Marta, Roberts, C. Neil, Pitter, Sharmini, Evershed, Richard P.

“…The 8.2-thousand years B.P. event is evident in multiple proxy records across the globe, showing generally dry and cold conditions for ca. 160 years…”
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The Impact of CO2 and Climate State on Whether Dansgaard–Oeschger Type Oscillations Occur in Climate Models by Malmierca‐Vallet, Irene, Sime, Louise C., Valdes, Paul J., Klockmann, Marlene, Vettoretti, Guido, Slattery, John

“…Greenland ice core records feature Dansgaard–Oeschger (D‐O) events, which are abrupt warming episodes followed by gradual cooling during ice age climate. The…”
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Global vegetation patterns of the past 140,000 years by Allen, Judy R. M., Forrest, Matthew, Hickler, Thomas, Singarayer, Joy S., Valdes, Paul J., Huntley, Brian

“…Aim Insight into global biome responses to climatic and other environmental changes is essential to address key questions about past and future impacts of such…”
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Green Sahara tipping points in transient climate model simulations of the Holocene by Hopcroft, Peter O, Valdes, Paul J

“…Abstract The ‘Greening’ and subsequent desertification of the Sahara during the early to mid-Holocene is a dramatic example of natural climate change. We…”
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