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Showing 1–8 of 8 results
Advanced filters: Author: Peter O. Hopcroft Clear advanced filters

  • A climate model identifies that periodic wet phases in the Sahara, termed North African Humid Periods, were driven by Earths orbital variations and were suppressed during glacial periods due to the influence of extensive ice sheets.

    • Edward Armstrong
    • Miikka Tallavaara
    • Paul J. Valdes
    ResearchOpen Access
    Nature Communications
    Volume: 14, P: 1-11

  • The fine fraction of the last glacial dust in Europe mainly originates from a remote source, potentially Northern Africa, based on an analysis of isotopic samples from 15 sites and Earth system model simulations.

    • Denis-Didier Rousseau
    • Catherine Chauvel
    • Alicja Ustrzycka
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-12

  • The cause of the increase in atmospheric methane from 375 p.p.b.v. during the last ice age to 680 p.p.b.v. at the onset of Industrialization remains uncertain. Here, using an Earth system model, the authors show that we cannot reconcile this rise based on our current understanding of natural methane sources.

    • Peter O. Hopcroft
    • Paul J. Valdes
    • David J. Beerling
    ResearchOpen Access
    Nature Communications
    Volume: 8, P: 1-10

  • Multi-year La Niña and El Niño events became more common over the past 7,000 years because of orbital forcings causing gradual changes in upper-ocean stratification in the Tropical Eastern Pacific, according to an analysis of proxy records and palaeoclimate modelling.

    • Zhengyao Lu
    • Anna Schultze
    • Qiong Zhang
    ResearchOpen Access
    Nature Geoscience
    Volume: 18, P: 337-343

  • The end of the green Sahara in the mid-Holocene was gradual, but punctuated by rapidly changing episodes of extreme drought and wetness, to which human societies were exposed and had to adapt to, as a lake record from southern Ethiopia suggests.

    • Martin H. Trauth
    • Asfawossen Asrat
    • Paul J. Valdes
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-9

  • Incorporating mid-Holocene vegetation changes over northern Africa amplifies Atlantic-driven teleconnections that shift the tropical Pacific toward a La Niña-like mean state and reduce El Niño-Southern Oscillation variability by up to 18%, according to simulations using global climate models.

    • Shivangi Tiwari
    • Francesco S. R. Pausata
    • W. Richard Peltier
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-11