Alan CANNELL, ISIPU, Italian Institute of Human Paleoantology, Roma, Italia, and Curitiba, Brazil

bandeau ISYEB
bandeau ISYEB
Le dernier séminaire de l’ISYEB et de la saison aura lieu le vendredi 1er juillet et accueillera Alan CANNELL,ISIPU, Italian Institute of Human Paleoantology, Roma, Italia, and Curitiba, Brazil
qui nous présentera ses travaux sur les paléo-atmosphères et la biodiversité passée.
Il sera en visite en France cet été et sera disponible en juillet pour toutes discussions scientifiques.
NEW DEVELOPMENTS IN THE STUDY OF PALEO-ATMOSPHERES AND THEIR IMPACTS ON THE BIOSPHERE OVER THE PAST 500 Ma
Highlights
· Mechanisms of atmospheric mass change – both nitrogen and oxygen: extreme UV radiation during low magnetic fields and outgassing during MOR seafloor spreading; bio-protection measures for high UVB exposure
· Rapid Cooling Events, spikes in 15N, high UV radiation and extinctions during long periods of low magnetic intensity
· Estimates of oxygen partial pressure (pO2) in paleo atmospheres from the direct measurement of air trapped in halite and from pyrite, amber and other proxies
· Indications of paleo density from modeled pole to equator temperature gradients and Hadley cells; polar forests and high latitude adiabatic warmth; tree heights; wildfires, the Neogene uplift paradox and the marine/terrestrial derived pCO2 paradox,
· Flight and respiration constraints on air density and pO2 from insects (odonata), the Hexapod and Large Volant Insect Gaps and wing stress; the Big Bang of bat evolution and the giant birds of the Miocene/Pliocene
A history of butterflies from the past into the future Nicolas Chazot, Department of Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden