HOME >> BIOLOGY >> NEWS
Northern climate, ecosystems driven by cycles of changing sunlight

CHAMPAIGN, Ill. -- Emerging geochemical and biological evidence from Alaskan lake sediment suggests that slight variations in the sun's intensity have affected sub-polar climate and ecosystems in a predictable fashion during the last 12,000 years.

Researchers at six institutions report the findings in the Sept. 26 issue of the journal Science. The data, they say, help to explain past changes on land and in freshwater ecosystems in northern latitudes and may provide information to help project the future.

The scientists identified cycles lasting 200, 435, 590 and 950 years during the Holocene Epoch, said principal investigator Feng Sheng Hu of the University of Illinois at Urbana-Champaign. The pattern of environmental variations they found also matches nicely with cyclic changes in solar irradiance and the extent of sea ice in the North Atlantic.

"We found natural cycles involving climate and ecosystems that seem to be related to weak solar cycles, which, if verified, could be an important factor to help us understand potential future changes of Earth's climate," Hu said.

"Will changes in solar irradiation in the future mitigate or exacerbate global warming in the future? They may do both," said Hu, a professor in the plant biology and geology departments at Illinois. "A period of high solar irradiance on top of high levels of greenhouse gases could result in unprecedented warming."

The new data come from Arolik Lake sediment in the tundra region near the Ahklun Mountains, along the southwestern coast of Alaska. Hu and co-author Darrell Kaufman of Northern Arizona University in Flagstaff have conducted climate-change research in that region for more than a decade.

"To our knowledge, this is the first data set from the North Pacific high latitudes that has enough details to evaluate the effects of centennial scale solar cycles on climate and ecosystems," Hu said.

Sediment samples were tested for a variety of biolo
'"/>

Contact: Jim Barlow, Life Sciences Editor
jebarlow@uiuc.edu
217-333-5802
University of Illinois at Urbana-Champaign
25-Sep-2003


Page: 1 2 3

Related biology news :

1. The Mediterranean connection: ecological effects of El Nio in the Northern hemisphere
2. Vast, wild Northern Forest gains new allies: 18 projects named in $1.8 million study
3. Worlds largest rain forest national park created in Northern Amazon
4. Northern Vietnam drinking water contains dangerous arsenic levels
5. Taking the long view: examining factors which influence Northern Spotted Owls
6. Dartmouth Medical School Researchers Discover Heavy Metal Contamination In Northern Mexico
7. New Evidence From Dinosaur Footsteps Show Massive Herds Once Roamed Northern Alaska
8. Increasing Frequency Of El Nino Takes Toll On Northern Hemispheres Only Penguins
9. MBL researcher and science teacher visit Siberia to study climate, excite children about science
10. For the sake of land and climate, coaxing soil to soak up carbon
11. Squirrels evolutionary family tree reveals major influence of climate, geology

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/14/2017)... (NYSE: IBM ) is introducing several innovative partner startups ... collaboration between startups and global businesses, taking place in ... nine startups will showcase the solutions they have built with ... France is one of the ... percent increase in the number of startups created between 2012 ...
(Date:5/16/2017)... 16, 2017   Bridge Patient Portal , ... MD EMR Systems , an electronic medical ... GE, have established a partnership to build an ... the GE Centricity™ products, including Centricity Practice Solution ... These new integrations will allow healthcare delivery ...
(Date:4/19/2017)... New York , April 19, 2017 ... competitive, as its vendor landscape is marked by the ... the market is however held by five major players ... Safran. Together these companies accounted for nearly 61% of ... of the leading companies in the global military biometrics ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... ... platform specifically designed for life science researchers to analyze and interpret datasets, ... Franklin, who made a major contribution to the discovery of the double-helix ...
(Date:10/11/2017)... ... ... Personal eye wash is a basic first aid supply for any work environment, but most ... you rinse first if a dangerous substance enters both eyes? It’s one less decision, and ... unique dual eye piece. , “Whether its dirt and debris, or an acid or alkali, ...
(Date:10/11/2017)... , Oct. 11, 2017  VMS BioMarketing, a leading ... a nationwide oncology Clinical Nurse Educator (CNE) network, which will ... need for communication among health care professionals to enhance the ... nurses, office staff, and other health care professionals to help ... breast cancer. ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... implantation and pregnancy rates in frozen and fresh in vitro fertilization (IVF) ... and maternal age to IVF success. , After comparing the results from the ...
Breaking Biology Technology:
Cached News: