Navigation Links
Rapid climate change and the role of the Southern Ocean
Date:4/8/2013

Scientists from Cardiff University and the University of Barcelona have discovered new clues about past rapid climate change.

The research, published this month in the journal Nature Geoscience, concludes that oceanographic reorganisations and biological processes are linked to the supply of airborne dust in the Southern Ocean and this connection played a key role in past rapid fluctuations of atmospheric carbon dioxide levels, an important component in the climate system.

The scientists studied a marine sediment core from the Southern Ocean and reconstructed chemical signatures at different water depths using stable isotope ratios in the shells of foraminifera, singlecelled marine organisms. They found that the chemical difference between intermediate level and deep waters over the last 300,000 years closely resembled the changes in atmospheric carbon dioxide levels and the input of windblown dust.

Dr Martin Ziegler, School of Earth and Ocean Sciences, explained: "The deep ocean is by far the largest pool of available carbon on short timescales. In the Southern Ocean, water from the deep rises to the sea surface and comes in contact with the atmosphere. These waters will release their carbon to the atmosphere unless marine phytoplankton captures this carbon through photosynthesis and transports it back into the deep when it dies and sinks. The efficiency of this biological activity in the Southern Ocean is thought to depend on the input of nutrients, namely iron, contained in wind blown dust. It is also this efficiency that determines the strength of chemical stratification in the Southern Ocean."

Professor Ian Hall, School of Earth and Ocean Sciences, added: "Our study finds large changes in chemical stratification of the Southern Ocean not only across the shifts from ice ages to warm interglacial conditions, but also on more rapid, millennial timescales. However, changes in dust flux on these short timescales are much smaller. This could suggest that the biological response to a change in dust input is much more sensitive when the dust flux is relatively low such as it is today. This iron fertilization process might be therefore more important than previously thought."

These findings provide an important benchmark for climate modeling studies and more research will be needed to determine the significance and impact of future changes in dust input into the Southern Ocean.


'/>"/>

Contact: Ian Hall
Hall@cardiff.ac.uk
44-029-208-75612
Cardiff University
Source:Eurekalert

Related biology news :

1. Mobile LIDAR technology expanding rapidly
2. Psychemedics & TruTouch Announce US Sales/Marketing Distribution Agreement For TruTouch Technologies Rapid Optical Alcohol Detection & Biometric Test
3. Rapid, point-of-care tests for syphilis: The future of diagnosis
4. Imaging biomarker predicts response to rapid antidepressant
5. New study will predict how trees will adapt to rapid climate change
6. Tumors evolve rapidly in a childhood cancer, leaving fewer obvious tumor targets
7. ASU partners with Life Technologies on US DHHS funded project to rapidly assess radiation dose
8. New antidepressant acts very rapidly and is long lasting
9. New study reveals lions are rapidly losing ground in Africa
10. Rapid changes in climate dont slow some lizards
11. Forest killer plant study explores rapid environmental change factors
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/15/2016)... , April 15, 2016 ... the,  "Global Gait Biometrics Market 2016-2020,"  report to ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait biometrics ... of 13.98% during the period 2016-2020. ... angles, which can be used to compute factors ...
(Date:3/29/2016)... , March 29, 2016 LegacyXChange, ... LegacyXChange "LEGX" and SelectaDNA/CSI Protect are pleased to announce ... used in a variety of writing instruments, ensuring athletes ... originally created collectibles from athletes on LegacyXChange will be ... of the DNA. Bill Bollander , ...
(Date:3/18/2016)... , March 18, 2016 --> ... of Biometrics, ICT, Manned & Unmanned Vehicles, Physical infrastructure and ... security companies in the border security market and the continuing ... and Europe has led visiongain to ... improved success. --> defence & security companies ...
Breaking Biology News(10 mins):
(Date:5/23/2016)... ... 23, 2016 , ... PrecisionAg® Media has released its latest ... The paper outlines the key trends that are creating both opportunities and challenges ... lot of highs and lows as the precision agriculture market has grown and ...
(Date:5/23/2016)... Oxitec CEO Hadyn Parry will testify ... before the United States House Committee on Science, Space and ... controlling the spread of the Aedes aegypti mosquito, ... (Logo: http://photos.prnewswire.com/prnh/20150630/227348 ) Oxitec has pioneered ... in Brazil , Panama ...
(Date:5/23/2016)... ... May 23, 2016 , ... RoviSys, a leading independent ... Aurora, Ohio, has broken ground on a new building in Holly Springs, NC. ... this new location solidifies a commitment to business in the region. The new ...
(Date:5/22/2016)... ... May 22, 2016 , ... Doctors in Rome say micronutrients found ... cancer, malignant mesothelioma. Surviving Mesothelioma has just posted an article on the new research. ... Rome’s Department of Clinical Sciences and Translational Medicine evaluated more than 150 studies on ...
Breaking Biology Technology: