Results 51 to 60 of about 2,064 (153)

720 Million Years of Arctic Globalization, from Snowball Earth to the Anthropocene: Insights from Paleohistory

Nordicum-Mediterraneum
This article extends our time horizon back 720 million years for a deep-historical examination of the interplay of geological, biological, and climatic dynamics to inform our understanding of Arctic globalization across the eons.
Barry Zellen
doaj   +1 more source

A slippery slope for Cryogenian diamictites?

The Depositional Record, 2019
The Death Valley region has previously been claimed to preserve the sedimentary records of both the Sturtian and Marinoan snowball Earth events within the Kingston Peak Formation, which outcrops in a number of disconnected mountain ranges.
Daniel Paul Le Heron, Thomas M. Vandyk
doaj   +1 more source

Emergence of Animals from Heat Engines – Part 1. Before the Snowball Earths

Entropy, 2009
The origin of life has previously been modeled by biological heat engines driven by thermal cycling, caused by suspension in convecting water. Here more complex heat engines are invoked to explain the origin of animals in the thermal gradient above a ...
Anthonie W. J. Muller
doaj   +1 more source

A geochemical modelling study of the evolution of the chemical composition of seawater linked to a "snowball" glaciation [PDF]

Biogeosciences, 2008
The Snowball Earth theory initially proposed by Kirschvink (1992) to explain the Neoproterozoic glacial episodes, suggested that the Earth was fully ice-covered at 720 Ma (Sturtian episode) and 640 Ma (Marinoan episode).
G. Le Hir, Y. Goddéris, Y. Donnadieu, G. Ramstein   +3 more
doaj  

Resolved Snowball Earth Clouds

Journal of Climate, 2014
AbstractRecent general circulation model (GCM) simulations have challenged the idea that a snowball Earth would be nearly entirely cloudless. This is important because clouds would provide a strong warming to a high-albedo snowball Earth. GCM results suggest that clouds could lower the threshold CO2 needed to deglaciate a snowball by a factor of 10–100,
openaire   +1 more source

Deglacial volcanism and reoxygenation in the aftermath of the Sturtian Snowball Earth. [PDF]

Sci Adv, 2023
Li M, Xu Y, Sun L, Chen J, Zhang K, Li D, Farquhar J, Zhang X, Sun R, Macdonald FA, Grasby SE, Fu Y, Shen Y.   +12 more
europepmc   +1 more source

Emplacement of the Franklin large igneous province and initiation of the Sturtian Snowball Earth. [PDF]

Sci Adv, 2022
Pu JP, Macdonald FA, Schmitz MD, Rainbird RH, Bleeker W, Peak BA, Flowers RM, Hoffman PF, Rioux M, Hamilton MA.   +9 more
europepmc   +1 more source

Snowball Earth, population bottleneck and Prochlorococcus evolution. [PDF]

Proc Biol Sci, 2021
Zhang H, Sun Y, Zeng Q, Crowe SA, Luo H.
europepmc   +1 more source

A transient peak in marine sulfate after the 635-Ma snowball Earth. [PDF]

Proc Natl Acad Sci U S A, 2022
Peng Y, Bao H, Jiang G, Crockford P, Feng D, Xiao S, Kaufman AJ, Wang J.   +7 more
europepmc   +1 more source

Climate Variability Leads to Multiple Oxygenation Episodes Across the Great Oxidation Event

Geophysical Research Letters
The temporal relationship between global glaciations and the Great Oxidation Event (GOE) suggests that climate change played an important role in Earth's oxygenation.
Daniel Garduno Ruiz, Colin Goldblatt, Anne‐Sofie Ahm   +2 more
doaj   +1 more source