Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
by Staff Writers
Aarhus, Denmark (SPX) Sep 16, 2013
A community of microscopic algae and bacteria thrives within the Arctic and Antarctic pack ice. These ice-organisms are adapted to growing on the ice crystal surfaces and within a labyrinth of channels and pores that permeate the ice floes.
It is a hostile place to grow with temperatures often at -10 C to -20 C, low light and within six or seven times more salty brines in the ice channels compared to the underlying seawater from where these organisms originate.
Many marine organisms secrete gel-like substances in response to environmental stress, and these ice-dwellers are no exception. In fact they secrete large quantities of gels that are made up from various types of polysaccharides.
A new study released in Proceedings of the National Academy of Science, now demonstrate that these gels from ice-microorganisms are important in both the Arctic and Antarctic. It is likely that they will not only affect the physical structure within the ice but also how carbon travels to the ocean floor and even the weather.
There is also evidence that micro-gels at the ocean surface may get caught up into the air and eventually act as cloud condensing nuclei thereby affecting weather. The gels therefore have profound implications for both the long-term burial of carbon to the ocean floor and thus the global carbon budget and on the weather.
Since 2006 Professor Graham Underwood and Dr Shazia Aslam from University of Essex and Professor David Thomas from Arctic Research Centre, Aarhus University have led several projects (funded by the Natural Environment Research Council, UK) to study the production of micro-gels, and their widespread importance to the frozen realms of the worlds oceans. They teamed up with colleagues from Australia and Canada to collect and analyse ice cores from both the Arctic and Antarctic.
Seven years on, and many frozen trips later, they now publish a rather surprising finding. Analysing ice data spanning ice from both the Arctic and Antarctic, they are now able to determine the amounts of gel production from the ice microbes based on data of the physical nature of the ice and the amount of microbiology.
"It means that we can estimate the concentration of gels in ice, by knowing rather routine measurements such as the thickness of the ice floes, temperature and salinity of the ice and the quantity of ice biology measured as the chlorophyll content of the ice," says Professor David Thomas, Arctic Research Centre, Aarhus University.
"This is a huge step forwards to enable us to estimate the significance of these materials to the millions of square kilometres of Antarctic and Arctic pack ice", says Thomas.
GJC Underwood, S Aslam, C Michel, A Niemi, L Norman, KM Meiners, J Laybourn-Parry, H Paterson and DN Thomas. 2013. Broad-scale predictability of carbohydrates and exopolymers in Antarctic and Arctic sea ice. Proceedings of the National Academy of Sciences of the United States of America, DOI 10.1073/pnas.1302870110
Darwin Today At TerraDaily.com
|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|