Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. 24/7 Space News .




EARLY EARTH
Study: Heat prolonged ancient extinctions
by Staff Writers
Leeds, England (UPI) Oct 19, 2012


disclaimer: image is for illustration purposes only

European scientists say they've discovered why a "dead zone" following the worst extinction of all time lasted so long -- it was simply too hot to survive.

Researchers have studied what happened after a mass extinction around 250 million years ago in the pre-dinosaur era wiped out nearly all the world's species.

Such mass extinctions are usually followed by a "dead zone" -- during which new species are not seen -- lasting some tens of thousands of years, but the event of 250 millions years ago was followed by a dead zone lasting a puzzling 5 million years, they said.

A study led by the University of Leeds with colleagues in Germany and China shows the cause of this lengthy devastation was a temperature rise to lethal levels in the tropics: around 120 to 140 degrees Fahrenheit on land at 104 degrees at the sea surface.

"Global warming has long been linked to the end-Permian mass extinction, but this study is the first to show extreme temperatures kept life from re-starting in Equatorial latitudes for millions of years," said Yadong Sun, who is completing his doctorate at Leeds.

Water temperatures near the ocean's surface of 104 degrees would be a near-lethal value at which marine life dies and photosynthesis stops, the researchers said.

Until now, climate modelers have assumed sea-surface temperatures cannot exceed 86 degrees.

The dead zone would have been a strange world, the researchers said, with no forests, only shrubs and ferns, no fish or marine reptiles in the tropics, and virtually no land animals because their high metabolic rate made it impossible to deal with the extreme temperatures.

Only the polar regions would have provided a refuge from the baking heat, they said.

.


Related Links
Explore The Early Earth at TerraDaily.com






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





EARLY EARTH
Tropical collapse caused by lethal heat
Leeds UK (SPX) Oct 19, 2012
Scientists have discovered why the 'broken world' following the worst extinction of all time lasted so long - it was simply too hot to survive. The end-Permian mass extinction, which occurred around 250 million years ago in the pre-dinosaur era, wiped out nearly all the world's species. Typically, a mass extinction is followed by a 'dead zone' during which new species are not seen for tens ... read more


EARLY EARTH
European mission to search for moon water

Model reconciles Lunar Earth composition with giant impact theory

Massive planetary collision may have zapped key elements from moon

Proof at last: Moon was created in giant smashup

EARLY EARTH
Valles Marineris - the largest canyon in the Solar System

Curiosity Rover Collects Fourth Scoop of Martian Soil

How Space Station Can Help Humans Follow Curiosity to Mars and Beyond

Mars Soil Sample Delivered for Analysis Inside Rover

EARLY EARTH
NASA must reinvest in nanotechnology research, according to new Rice University paper

Austrian space diver no stranger to danger

Baumgartner feat boosts hopes for imperilled astronauts

Austrian breaks sound barrier in record space jump

EARLY EARTH
Patience for Tiangong

China launches civilian technology satellites

ChangE-2 Mission To Lagrange L2 Point

Meeting of heads of ESA and China Manned Space Agency

EARLY EARTH
New ISS Crew Confirmed

Russia launches three astronauts to ISS

ISS Orbit to be Adjusted for Next Spacecraft

Crew Unloads Dragon, Finds Treats

EARLY EARTH
Brazil eyes closer space cooperation with Ukraine

S. Korea plans third rocket launch bid Friday

AFSPC commander convenes AIB

Proton Lofts Intelsat 23 For Americas, Europe and Africa Markets

EARLY EARTH
New small satellite will study super-Earths for ESA

Most Planetary Systems are 'Flatter than Pancakes'

Glitch could end NASA planet search

Ultra-Compact Planetary System Is A Touchstone For Understanding New Planet Population

EARLY EARTH
Angkor Wat builders may have had shortcut

Taking aim at rivals, Apple unveils iPad mini

Japan firm launches real-time telephone translation

Microsoft gives peek at new Windows, tablet




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement