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:4/13/2017)... -- According to a new market research report "Consumer IAM ... and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region - Global ... grow from USD 14.30 Billion in 2017 to USD 31.75 Billion by ... ... MarketsandMarkets Logo ...
(Date:4/6/2017)... 6, 2017 Forecasts by Product ... Readers, by End-Use (Transportation & Logistics, Government & Public ... & Fossil Generation Facility, Nuclear Power), Industrial, Retail, Business ... Are you looking for a definitive report on ... ...
(Date:4/3/2017)... , April 3, 2017  Data captured ... engineering platform, detected a statistically significant association ... prior to treatment and objective response of ... potential to predict whether cancer patients will ... treatment, as well as to improve both pre-infusion ...
Breaking Biology News(10 mins):
(Date:9/22/2017)... ... September 22, 2017 , ... ... Justin Zalewsky in offering LANAP® and LAPIP™ laser treatments. Drs. Hoge and Zalewsky ... to patients, a minimally invasive and less painful option that produces real results. ...
(Date:9/21/2017)... ... September 21, 2017 , ... ... which includes executive, engineering and manufacturing functions to The LaunchPort™ Accelerator at the ... provide a full range of manufacturing and business services to its Residents. ...
(Date:9/21/2017)... (PRWEB) , ... September 21, 2017 , ... ... clinical client portal. Each relaunch of the portal includes new features that facilitate ... medical device companies seek to remain at the forefront of medical advancements, they ...
(Date:9/21/2017)... ... September 21, 2017 , ... When a downtown Greenville ... was swift and efficient thanks to the continuing efforts of members of the ... more than 50 stakeholders, including officials from area counties and cities, Renewable Water ...
Breaking Biology Technology: