Sentences with phrase «global glaciation»
"Global glaciation" refers to a situation where large portions of the Earth's surface are covered by glaciers or ice sheets, extending over continents and oceans. It means that the Earth experiences an extensive and long-lasting period of extreme cold temperatures, causing the growth of glaciers and ice to become widespread. Full definition
A similar low and high arsenic content accompanied the coming and going of global glaciations at around 0.7 billion years ago, which is when Earth first saw the appearance of complex life.
sciencedaily.com
«In particular, this mechanism may have contributed to Earth's entry into a long period of global glaciation around 700 million years ago, a theory known as the Snowball Earth hypothesis.»
«In addition, this early phase of evolutionary divergence appears to have preceded the extreme climate changes that led to Snowball Earth, a period marked by severe long - term global glaciation that lasted from about 720 to 635 million years ago,» Dohrmann says.
«In the article we argue that when we first see the appearance of complex life on Earth, is when life have developed mechanisms to resist catastrophic chemical changes forced by global glaciations.
This is also a period when Earth experienced its first known global glaciation.
The other problem for an Earth with 0.75 - 0.8 x modern solar irradiance is that it is extremely prone to a snowball state because of ice - albedo and water vapor feedbacks (and not trivial to escape from that state, this is a problem even for the Neoproterozoic global glaciation, let alone an earlier one).
Pierrehumbert RT 2004: High levels of atmospheric carbon dioxide necessary for the termination of global glaciation Nature 429, 646 - 649.
But also that in the very early oceans, arsenic co-varied with the rise of atmospheric oxygen and coincided with the coming and going of global glaciations.
A geologist's revisionist theory pushing the formation of the Isthmus of Panama back 10 million years casts doubt on mainstream ideas of what caused the last ice age as well as the global glaciation cycle that generates the world's current climate
2017/10/10 - While burning coal today causes Earth to overheat, about 300 million years ago the formation of that same coal brought our planet close to global glaciation.
I am under impression that all current climate models can't see farther than their nose of returning to «global equillibrium» after perturbation in «forcing», any substantial excursions of state trajectories are dismissed as numerical errors, so the global glaciation - deglaciation episodes have no support in current global climate models.
Three areas of particular interest and debate are the «faint young Sun paradox,» the role of organisms in shaping Earth's atmosphere, and the possibility that Earth went through one or more «snowball» phases of global glaciation.