Navigation Links
Seasons Arriving 2 Days Earlier, Study Says
Date:1/21/2009

Change is linked to wind pattern that controls winter in Northern Hemisphere

WEDNESDAY, Jan. 21 (HealthDay News) -- If it seems that flower buds are popping open earlier in the spring, and birds are migrating sooner, new research may explain why.

Not only have average worldwide temperatures been rising for the last 50 years, but the hottest day of the year has shifted almost two days earlier.

That's the conclusion of a new study by scientists at the University of California, Berkeley, and Harvard University that was published in the Jan. 22 issue of the journal Nature.

While greenhouse gases seem to be the cause of global warming, human activity may also be prompting this shift in the seasons, Alexander R. Stine, a graduate student in UC Berkeley's department of earth and planetary science and first author of the report, said in a university news release.

"We see 100 years where there is a very natural pattern of variability, and then we see a large departure from that pattern at the same time as global mean temperatures start increasing, which makes us suspect that there's a human role here," he said.

Although it's not clear what might be behind this seasonal shift -- which has only been seen over land masses, but not the oceans -- the researchers said the trend may partly owe to a shift in a certain pattern of winds that also has been changing over the same period of time. This wind circulation -- called the Northern Annular Mode -- helps determine why one winter in the Northern Hemisphere is different from another. These winds also play a key role in controlling the arrival of the seasons each year, the study authors said.

For their study, the scientists relied on a publicly available database of global surface temperatures over both land and ocean from 1850 to 2007 that was compiled by the University of East Anglia's Climate Research Unit in the United Kingdom. Using non-tropical data only, the researchers found that, while land temperatures in the 100-year period between 1850 and 1950 showed a simple pattern of variability, temperatures in the period 1954-2007 peaked 1.7 days earlier.

Biologists have noticed many changes in the arrival time of spring over the past 50 years, such as buds opening sooner, birds migrating earlier, and sea ice breaking up earlier. While some scientists thought these changes were due to global warming, the new study found that individual months have been warming at different rates than others. That means the peak summer temperature and lowest winter temperature both now arrive earlier each year, the news release said.

"We're saying that, on top of the long-term trend of warmer summer and winter highs, peak warming is coming earlier within the year," Inez Fung, co-director of the Berkeley Institute of the Environment, said in the news release. "It's not just the onset of spring, but the peak."

More information

To learn more about climate change, visit the U.S. Department of Environmental Protection.



-- HealthDay staff



SOURCE: University of California, Berkeley, news release, Jan. 21, 2009


'/>"/>
Copyright©2009 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Climate Change Linked to Longer Pollen Seasons
2. Molecular imaging enables earlier, individualized treatment of thyroid cancer
3. Cancer detected earlier, faster, with new medical imaging, Stanford study finds
4. Huckabees Defense of Earlier, Alarmist AIDS Stance Shows Unsuitability for Presidency, Says AHF
5. Rural patients colon and lung cancers diagnosed earlier, Dartmouth research says
6. Joslin launches national study to explore if anti-inflammatory drug can treat type 2 diabetes
7. Penn study: Breast cancer survivors call for more survivorship care from primary care physicians
8. Eklin Launches New RapidStudy(TM) CDx Digital Radiography System at NAVC
9. Study Weighs Cost, Benefit of Gene Tests Before Warfarin Rx
10. Study compares 2 nonsurgical treatments for reflux disease
11. Study examines racial disparities in survival among patients diagnosed with lung cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... ... , ... Brent Kasmer, a legally blind and certified personal trainer is helping to develop a ... fitness app plans to fix the two major problems leading the fitness industry today:, ... type program , They don’t eliminate all the reasons people quit their exercise ...
(Date:6/25/2016)... ... June 25, 2016 , ... ... issues and applications at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the ... several important health care topics including advance care planning, healthcare costs and patient ...
(Date:6/25/2016)... ... ... of Bruton Memorial Library on June 21 due to a possible lice infestation, as reported ... head lice: the parasite’s ability to live away from a human host, and to infest ... in the event that lice have simply gotten out of control. , As lice are ...
(Date:6/25/2016)... , ... June 25, 2016 , ... First Choice ... States, named Dr. Sesan Ogunleye, as the Medical Director of its new Mesquite-Samuell Farm ... Medical Director of our new Mesquite location,” said Dr. James M. Muzzarelli, Executive Medical ...
(Date:6/25/2016)... Oklahoma (PRWEB) , ... June 25, 2016 , ... ... both athletes and non-athletes recover from injury. Recently, he has implemented orthobiologic procedures ... Oklahoma City area —Johnson is one of the first doctors to perform the ...
Breaking Medicine News(10 mins):
(Date:6/23/2016)... 2016 Capricor Therapeutics, Inc. ... biotechnology company focused on the discovery, development and ... enrollment in its ongoing randomized HOPE-Duchenne clinical trial ... of its 24-patient target. Capricor expects the trial ... of 2016, and to report top line data ...
(Date:6/23/2016)... Calif. , June 23, 2016 ... CST on Thursday, July 7, 2016 , , , , ... ) , , , , EXPERT PANELISTS:  , , ... Naik; Senior Industry Analyst, Christi Bird; Senior Industry Analyst, Divyaa Ravishankar ... The global pharmaceutical industry is witnessing an exceptional ...
(Date:6/23/2016)... -- Revolutionary technology includes multi-speaker listening to ... leaders in advanced audiology and hearing aid technology, has ... the world,s first internet connected hearing aid that opens ...      (Photo: http://photos.prnewswire.com/prnh/20160622/382240 ) , ... firsts,: , TwinLink™ - the first dual ...
Breaking Medicine Technology: