Navigation Links
Has the mystery of the Antarctic ice sheet been solved?
Date:2/27/2008

A team of scientists from Cardiff Universitys School of Earth and Ocean Sciences and Amgueddfa Cymru - National Museum Wales travelled to Africa to find new evidence of climate change which helps explain some of the mystery surrounding the appearance of the Antarctic ice sheet.

Ice sheet formation in the Antarctic is one of the most important climatic shifts in Earths history. However, previous temperature records show no evidence of the oceans cooling at this time, but instead suggest they actually warmed, presenting a confusing picture of the climate system which has long been a mystery in palaeoclimatology.

Now Dr Carrie Lear, Lecturer in Palaeoceanography, and her team at Cardiff have presented new temperature records using ancient sea floor mud recovered from Tanzania, East Africa. The shell chemistry of pin-head sized animals called foraminifera (forams) reveal that ocean temperatures did in fact cool by about 2.50C.

Dr Lear said: Forams are great tools for studying climates of the past, which helps us learn about the uncertainties of our future greenhouse climate. These new records help resolve a long-standing puzzle regarding the extent of ice-sheet growth versus global cooling, and bring climate proxy records into line with climate model simulations.

We have been able to use the chemistry of the Tanzanian microfossils to construct records of temperature and ice volume over the interval of the big climate switch. These new records show that the worlds oceans did cool during the growth of an ice sheet, and that the volume of ice would have fitted onto Antarctica; so now the computer models of climate and the past climate data match up.

The team at Cardiff Universitys School of Earth, Ocean and Planetary Sciences will now look for evidence of the ultimate cause of the global cooling using the forams. They believe the prime suspect is a gradual reduction of CO2 in the atmosphere, combined with a trigger time when Earths orbit around the sun made Antarctic summers cold enough for ice to remain frozen all year round.


'/>"/>

Contact: Dr. Carrie Lear
carrie@earth.cf.ac.uk
029-208-79004
Cardiff University
Source:Eurekalert

Related biology news :

1. UCLA researchers solve decade-old mystery
2. Ancient mystery solved
3. ASU professor helps solve mystery of glassy water
4. 480-million-year-old fossil sheds light on 150-year-old paleontological mystery
5. Time-sharing tropical birds key to evolutionary mystery
6. Cassini on the trail of a runaway mystery
7. Magnetic snakes control fluids, gravity-defying droplets, and solving a dragonfly mystery
8. Men shed light on the mystery of human longevity, study finds
9. Folate mystery finally solved
10. Scientists tackle mystery mountain illness
11. Krill discovered living in the Antarctic abyss
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/21/2016)... -- Unique technology combines v ...   Xura, Inc. (NASDAQ: ... communications services, today announced it is working alongside SpeechPro ... particularly those in the Financial Services Sector, the ability ... a mobile app, alongside, and in combination with, traditional ...
(Date:3/15/2016)... -- Yissum Research Development Company of the Hebrew ... Hebrew University, announced today the formation of Neteera ... human biological indicators. Neteera Technologies has completed its first ... ... emissions from sweat ducts, enables reliable and speedy biometric ...
(Date:3/11/2016)... -- --> --> ... Market by Technology (Pattern Recognition), by Component (Hardware, Software, ... (On-Premises and Cloud), by Industry Vertical and by Region ... global market is expected to grow from USD 12.49 ... at a CAGR of 19.1%. , ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... ... May 25, 2016 , ... Scientists at the University of Athens ... for mesothelioma may be hampering the research that could lead to one good one. ... to read it now. , The team evaluated 98 mesothelioma patients ...
(Date:5/25/2016)... Connecticut (PRWEB) , ... May 25, 2016 , ... ... the U.S. Food and Drug Administration (FDA) has granted the company’s orphan drug ... the company’s second orphan drug designation granted by the FDA. , Spinocerebellar ...
(Date:5/24/2016)... La Jolla, CA (PRWEB) , ... May 24, 2016 , ... ... and financial planning for corporate executives and entrepreneurs, held The Future of San Diego ... leaders in the San Diego life science community attended the event with speakers Dr. ...
(Date:5/23/2016)... ... May 23, 2016 , ... PrecisionAg® Media has ... 2017 and Beyond. The paper outlines the key trends that are creating both ... “We’ve witnessed a lot of highs and lows as the precision agriculture market ...
Breaking Biology Technology: