Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Research Reveals Consequences of Climate Cooling in Antarctica

14.01.2002


While the rest of world has warmed, Antarctica has grown chillier, scientists say. According to a new study, air temperature on the southernmost continent fell by 0.7 degree Celsius per decade between 1986 and 2000 - a cooling trend that has come with ecological consequences.

The findings may come as a surprise to climate researchers. Conventional wisdom holds that the polar regions should be the first to show the effects of global warming. And previous work has indeed detected increased temperatures in Antarctica. But those studies, Peter T. Doran of the University of Illinois and colleagues note, used data collected from the Antarctic Peninsula, which extends north toward South America. Doran and his team, in contrast, analyzed a 14-year continuous weather station record from a cold, snow-less desert known as the dry valleys region—the continent’s largest ice-free area. The results of that analysis, in combination with a 35-year continental temperature compilation, suggest that temperature readings from the more numerous Peninsula stations have misrepresented the situation. "Our approach," Doran remarks, "shows that if you remove the Peninsula from the data set and look at the spatial trend, the majority of the continent is cooling."

Furthermore, the observed cooling is seasonal, affecting summer and fall temperatures the most. Summer cooling can have an especially dramatic impact on the organisms in Antarctica’s fragile terrestrial ecosystems, where liquid water is of limited availability. In fact, the continent’s cooling trend already appears to have affected life in the dry valleys, the researchers note. Decreased productivity of the region’s lakes may well stem from a climate-induced increase in lake ice thickness, which cuts down on the amount of light that reaches the resident phytoplankton. Changes in the abundance of soil-dwelling invertebrates have occurred as well, the team reports, declining in some cases by 10 percent per year. Prolonged summer cooling, the investigators thus propose, "will diminish aquatic and soil biological assemblages throughout the valleys and possibly in other terrestrial Antarctic ecosystems."


Kate Wong | Scientific American

More articles from Earth Sciences:

nachricht How much biomass grows in the savannah?
16.02.2017 | Friedrich-Schiller-Universität Jena

nachricht Canadian glaciers now major contributor to sea level change, UCI study shows
15.02.2017 | University of California - Irvine

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Biocompatible 3-D tracking system has potential to improve robot-assisted surgery

17.02.2017 | Medical Engineering

Real-time MRI analysis powered by supercomputers

17.02.2017 | Medical Engineering

Antibiotic effective against drug-resistant bacteria in pediatric skin infections

17.02.2017 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>