Sentences with phrase «snowball earth»

From these papers, one can trigger a full snowball Earth with a sufficient reduction in atmospheric CO2.
Of course if you are talking about snowball earth, that's another matter entirely.
One or more ensued as the recovery from Snowball Earth episodes (a fascinating story, but there is no room to detail this here).
Peltier, who is not involved in this work, believes one of the most outstanding issues remaining in Snowball Earth studies is the effect of the topography (i.e., altitude variations).
The team has received a grant from the Exobiology & Evolutionary Biology element of the NASA Astrobiology Program to explore other Snowball Earth scenarios.
THE idea that Earth was entirely frozen over about 700 million years ago — the so - called Snowball Earth hypothesis — poses one small problem: how did our planet thaw out?
Jim Green: One of the things that we've uncovered is that, in Earth's past, [our planet has] gone through various stages, one of which we call Snowball Earth.
Then, students were asked to mark on the toilet paper when certain events in Earth's history, such as snowball earth, occurred.
Evidence for Snowball Earth comes from the discovery of glacial rock formations around the world that date back to this time.
I have been involved in projects to simulate the Neoproterozoic snowball Earth events, the climates of the super-continent Pangea, and the Paleocene - Eocene Thermal Maximum.
This model does not, however, explain one of the most puzzling features of this rapid deglaciation; namely the global formation of hundreds of metres thick deposits known as «cap carbonates», in warm waters after Snowball Earth events.
The features that allowed one species or family to get through Snowball Earth or the Mexican asteroid or the Deccan Traps were by definition irrelevant to their adaptive fitness in normal times.
We used it heavily as part of a Global Climate Processes course at UW - Madison for later undergrad and grad students, so it has a good deal of flexibility in what you can test (though the model blows up for extreme forcings like snowball Earth, I used CO2 at about 140 ppm and couldn't get much lower than that).
Abbot DS and Pierrehumbert RT 2010: Mudball: Surface dust and Snowball Earth deglaciation, Geophys.
During global cooling periods, there is less ocean evaporation, fewer clouds, lower albedo, which allows more TSI to hit the earth's surface, thus preventing snowball earth.
«Studying Snowball Earth glaciations can tell us just how bad it can get, in which case life as we know it would probably not survive,» says geologist Linda Sohl of Columbia University's Center for Climate Systems Research and NASA's Goddard Institute for Space Studies.
So if the oceans cant absorb IR to get their heat and if they cant absorb heat from the air (which is actually a good thing otherwise it would be snowball earth time) then where oh where did all the heat go?
And new data published in the December issue of Geology only further throws snowball earth into question.
Their theory, dubbed snowball earth, held that between 750 million and 580 million years ago, ice repeatedly enveloped our planet, coating the seas from pole to pole and killing off early life almost completely.
The'Paleoproterozoic Snowball Earth» was about 2.3 billion years ago.
Some parts of the biosphere survived Snowball Earth and the KT impact event — they will survive us.
Around the time the event — officially called the Sturtian snowball Earth event — began, a large volcanic eruption was recorded as well, which affected a vast area, from present - day Alaska to Greenland.
Climate modelers go back in time to simulate past Snowball Earth conditions and find that complete freeze - over is hard to achieve.
It has even been hypothesized that during the Cryogenian period, this sea ice extended all the way to the equator (see Snowball Earth).
We proposed that the Makganyene Snowball Earth event, which occurred at ~ 2.3 billion years ago, was a direct consequence of the transition.
The volcanos that may have contributed to snowball Earth spanned almost 2000 miles and erupted continuously for years.
There are many evolutionary implications of Snowball Earth because of the island biogeography it implies.
Abbot DS, Voigt A, Li D, Le Hir G, Pierrehumbert RT -LCB- \ it et al -RCB- 2013: Robust elements of Snowball Earth atmospheric circulation and oases for life.
Pierrehumbert RT 2005: Climate dynamics of a hard snowball Earth.
The fact that they lucked out, after two billion years or so and a safe transition to the Phanerozoic (hey, what's a few Snowball Earths among friends?)
And it has survived near total extinction events where only subterranean bacteria persisted, snowball earth where no ground was left exposed, only thick icesheets.
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