facebook
twitter
rss
account
search
search
 

Study: Tree rings can miss climate events

Feb. 6, 2012 at 4:45 PM   |   Comments

UNIVERSITY PARK, Pa., Feb. 6 (UPI) -- Using tree rings to measure ancient climate events may underestimate the climate cooling effects of volcanic eruptions, U.S. researchers say.

Scientists at Penn State say this is because large enough temperature drops can lead to greatly shortened or even absent growing seasons as reflected in tree rings.

"We know these tree rings capture most temperature changes quite well," Michael Mann, professor of meteorology and geosciences, said in a university release Sunday.

"But the problem appears to be in their response to the intense short-term cooling that occurs following a very large volcanic eruption."

Trees create unique rings each year that often reflect the weather conditions that influenced the growing season that year, researchers said.

"The problem is that these trees are so close to the threshold for growth, that if the temperature drops just a couple of degrees, there is little or no growth and a loss of sensitivity to any further cooling. In extreme cases, there may be no growth ring at all," Mann said.

"If no ring was formed in a given year, that creates a further complication, introducing an error in the chronology established by counting rings back in time."

The potential absence of rings in the first one to three years following an extreme volcanic eruption can decrease the accuracy of ancient climate history reconstruction, researchers said.

Topics: Michael Mann
© 2012 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Most Popular
1
45,000-year-old man reveals earliest human genome 45,000-year-old man reveals earliest human genome
2
North Dakota forks over $3 million for mummified dinosaur North Dakota forks over $3 million for mummified dinosaur
3
Weather satellite outage threatens to foul forecasts Weather satellite outage threatens to foul forecasts
4
Dude! Company floats fly hoverboard Dude! Company floats fly hoverboard
5
Hurricane helps U.K. wind power briefly overtake nuclear Hurricane helps U.K. wind power briefly overtake nuclear
Trending News
Around the Web
x
Feedback