Global cooling may also affect marine life

Washington, June 17 (ANI): A "cold snap" 116 million years ago triggered a similar marine ecosystem crisis to those witnessed in the past as a result of global warming, according to a new research.

The international study involving experts from the universities of Newcastle, UK, Cologne, Frankfurt and GEOMAR-Kiel, confirms the link between global cooling and a crash in the marine ecosystem during the mid-Cretaceous greenhouse period.

It also quantifies for the first time the amplitude and duration of the temperature change. Analysing the geochemistry and micropaleontology of a marine sediment core taken from the North Atlantic Ocean, the team show that a global temperature drop of up to 5 degree C resulted in a major shift in the global carbon cycle over a period of 2.5 million years.

Occurring during a time of high tectonic activity that drove the breaking up of the super-continent Pangaea, the research explains how the opening and widening of new ocean basins around Africa, South America and Europe created additional space where large amounts of atmospheric CO2 was fixed by photosynthetic organisms like marine algae.

The dead organisms were then buried in the sediments on the seabed, producing organic, carbon rich shale in these new basins, locking away the carbon that was previously in the atmosphere.

The result of this massive carbon fixing mechanism was a drop in the levels of atmospheric CO2, reducing the greenhouse effect and lowering global temperature.

This period of global cooling came to an end after about 2 million years following the onset of a period of intense local volcanic activity in the Indian Ocean. Producing huge volumes of volcanic gas, carbon that had been removed from the atmosphere when it was locked away in the shale was replaced with CO2 from the Earth's interior, re-instating a greenhouse effect which led to warmer climate and an end to the "cold snap".

The research team say this study highlights how global climate is intrinsically linked to processes taking place in the Earth's interior at million year time scales and that these processes can modify ecospace for marine life, driving evolution.

Current research efforts tend to concentrate on global warming and the impact that a rise of a few degrees might have on past and present day ecosystems. This study shows that if global temperatures swing the other way by a similar amount, the result can be just as severe, at least for marine life.

However, the research team emphasise that the observed changes of the earth system in the Cretaceous happened over millions of years, rather than decades or centennial, which cannot easily be related to our rapidly changing modern climate conditions.

The research was published in Nature Geoscience. (ANI)

Matches

MORE TOP STORIES TODAY

Duminy steals first win for Delhi

Duminy steals first win for Delhi

Furious fifties by Duminy and Dinesh Karthik end a long losing streak for the Daredevils. More »

AB, Parthiv seal Bangalore's second win

AB, Parthiv seal Bangalore's second win

Royal Challengers overcame a stutter to cruise to the small target they were set by Mumbai Indians. More »

Glenn Maxwell carves his parallel universe

Glenn Maxwell carves his parallel universe

Glenn Maxwell seems to project an icy disdain when at the crease. Match situations rarely faze him and the bubble in which he plays excludes everyone … More »

Srinivasan can attend BCCI meeting

Srinivasan can attend BCCI meeting

His status as president of TNCA makes him eligible to attend the Working Committee meeting on Sunday. More »

No way back for Pietersen: ECB

No way back for Pietersen: ECB

Kevin Pietersen's hopes of reviving his international career appeared to end Saturday when ECB managing director Paul Downton said there was 'no way back'… More »

[REWIND] The world record that nearly wasn't

[REWIND] The world record that nearly wasn't

Twenty years ago this week, Brian Lara became Test cricket's highest scorer, but he almost didn't make it. More »

Moores gets second stint as England coach

Moores gets second stint as England coach

In a two-year spell from 2007 to 2009, the 51-year-old Moores led England in seven Test series. More »

Bangladesh senior players to see shrink

Bangladesh senior players to see shrink

Bangladesh's senior players will have three sessions with a psychological skill development coach later this month More »

BCCI is not anybody’s property — Dalmiya

BCCI is not anybody’s property — Dalmiya

Dalmiya feels that Srinivasan’s ‘power hungry’ attitude isn’t helping matters. More »

KP ridicules idea of day-night Tests

KP ridicules idea of day-night Tests

Kevin Pietersen has ridiculed the idea of day-night Test cricket, saying the game would be so different to proper Test cricket that we will need a whole… More »

Rajasthan edge low-scoring thriller

Rajasthan edge low-scoring thriller

The bowlers restricted Hyderabad to 133 for 6 before Rahane and Binny took Rajasthan over the line. More »

Tough for bowlers: Saeed Ajmal

Tough for bowlers: Saeed Ajmal

The 36-year-old believes the T20 format and rule changes in 50-over matches have made a real difference. More »

Maxwell blitz takes Punjab home

Maxwell blitz takes Punjab home

The Kings XI batsman blasted a 43-ball 95 to help his team pull off a massive chase against Chennai Super Kings. More »

BCCI members want independent probe

BCCI members want independent probe

The board members are realising after the Supreme Court's observations that something has to be done — IS Bindra More »

'BCCI lacks leaders to take on Srini'

'BCCI lacks leaders to take on Srini'

Two former BCCI presidents, Shashank Manohar and Jagmohan Dalmiya, have reacted strongly to the news of the BCCI calling an emergent meeting on Sunday… More »

Delhi look for first points against confident Kolkata

Delhi look for first points against confident Kolkata

Preview — The threat of Sunil Narine looms large again. More »

Bangalore vs Mumbai: A battle of the big-hitters

Bangalore vs Mumbai: A battle of the big-hitters

Preview — Given the firepower in both line-ups, Dubai crowd may see another high-scorer More »

Yuvraj tees off to Sharjah's delight

Yuvraj tees off to Sharjah's delight

Yuvraj Singh was hardly convincing to begin with against Delhi, but a big dose of crowd support and a helping of poor bowling meant he had the opportunity… More »

Stressed Trott stands down again

Stressed Trott stands down again

The England and Wales Cricket Board (ECB) on Friday confirmed that batsman Jonathan Trott is to take another break from all cricket with immediate eff… More »

PCB starts another coach hunt

PCB starts another coach hunt

The PCB has decided to not extend the contracts of head coach Moin Khan, fielding coach Shoaib Mohammad and batting consultant Zaheer Abbas, and has invited… More »

Fiery star Stokes bids to curb his temper

Fiery star Stokes bids to curb his temper

England all-rounder Ben Stokes admits he must keep his anger under control if he is to end his international exile. More »

Bangalore's arsenal blazes to victory

Bangalore's arsenal blazes to victory

Yuvraj Singh was back to his best in his first match for Royal Challengers Bangalore. More »

Pakistan cricketers face probe

Pakistan cricketers face probe

Pakistani cricket authorities have launched an investigation after a number of current international stars played in exhibition matches in the United States… More »

BCCI to meet before next court hearing

BCCI to meet before next court hearing

The BCCI will hold an emergent working committee meeting on April 20 to discuss the future course of action with regard to the Supreme Court hearing concerning… More »