"Webinar di geologia" del DST di Torino

In questo periodo di distaziamento sociale e di chiusura dei locali universitari i consueti Seminari di Geologia del nostro Dipartimento proveranno ad assumere la veste di seminari online. Sarà possibile seguire i seminari tramite la piattaforma WEBEX accedendo al link fornito.

Pertanto, 

Venerdì 24 aprile 2020 alle ore 14.30 si svolgerà seminario online dal titolo:

Atmospheric CO₂ and climate over geological time scales.

Relatore: Vanni Aloisi

Institut de Physique du Globe de Paris

Link per accedere al seminario: WEBINAR_CO2_ALOISI

Abstract

Carbon is essential to life on Earth. It is a major constituent of biomass, and most of the chemical energy needed for life is stored in organic compounds as bonds between carbon and other atoms. Carbon is also a fundamental constituent of the inorganic earth; it is present in the atmosphere as gaseous carbon dioxide (CO₂), in the ocean in various dissolved forms (CO₂, HCO₃^-, CO₃^2-), in the crust as carbonate minerals (mainly CaCO₃) organic matter and kerogen and in the mantle as diamond and graphite. The cycling of these carbon species through the different reservoirs of the geological carbon cycle influences long-term climate change via the greenhouse effect. In this talk I will present an introduction to proxies and models of the long-term carbon cycle and will show how Earths’ climate has changed in parallel with its biological and geological evolution. The processes controlling the distribution of carbon between the interior of the Earth, the lithosphere, the hydrosphere and the atmosphere will be introduced and integrated quantitatively into the GEOCARB numerical box model developed by Robert Berner that simulates the evolution of the Carbon cycle on the multi-million year time scale. Sensitivity tests will give an intuitive understanding of the relative importance of volcanism, continental weathering processes and the evolution of land-plants in controlling long-term climate change.