Featured Research

from universities, journals, and other organizations

Natural variability led to extra-cold 2008, research finds

Date:
December 31, 2009
Source:
American Geophysical Union
Summary:
An especially cold year in North America in 2008 led some members of the public and the media to question the scientific consensus on human-induced global warming. In addition, the cool global temperatures during the past decade may appear to contrast with the warming expected due to human influence. New research finds that the anthropogenic forcing in 2008 did contribute to temperatures warmer than would otherwise have occurred but that those human-induced effects were overwhelmed by a particularly strong bout of natural cooling.

New research finds that anthropogenic forcing in 2008 did contribute to temperatures warmer than would otherwise have occurred but that those human-induced effects were overwhelmed by a particularly strong bout of natural cooling.
Credit: iStockphoto/Todd Lammers

An especially cold year in North America in 2008 led some members of the public and the media to question the scientific consensus on human-induced global warming. In addition, the cool global temperatures during the past decade may appear to contrast with the warming expected due to human influence.

To clarify the roles of human influence and natural climate variability, Perlwitz et al. used observed temperature data and a suite of climate model simulations to analyze factors contributing to the 2008 North American temperature conditions.

The researchers found that the anthropogenic forcing in 2008 did contribute to temperatures warmer than would otherwise have occurred but that those human-induced effects were overwhelmed by a particularly strong bout of natural cooling. The authors determined that the North American cooling likely resulted from a widespread natural coolness in the tropical and northeastern Pacific Ocean.

The study implies that the abnormally cool 2008 is not likely part of a prolonged cooling trend and that general warming trends are likely to continue.

The research is published in Geophysical Research Letters. Authors include Judith Perlwitz, Jon Eischeid, and Taiyi Xu: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA, and Earth System Research Laboratory, NOAA, Boulder, Colorado, USA; Martin Hoerling: Earth System Research Laboratory, NOAA, Boulder, Colorado, USA; and Arun Kumar: Climate Prediction Center, NOAA, Camp Springs, Maryland, USA


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Journal Reference:

  1. Perlwitz et al. A strong bout of natural cooling in 2008. Geophysical Research Letters, 2009; 36 (23): L23706 DOI: 10.1029/2009GL041188

Cite This Page:

American Geophysical Union. "Natural variability led to extra-cold 2008, research finds." ScienceDaily. ScienceDaily, 31 December 2009. <www.sciencedaily.com/releases/2009/12/091230183204.htm>.
American Geophysical Union. (2009, December 31). Natural variability led to extra-cold 2008, research finds. ScienceDaily. Retrieved August 27, 2014 from www.sciencedaily.com/releases/2009/12/091230183204.htm
American Geophysical Union. "Natural variability led to extra-cold 2008, research finds." ScienceDaily. www.sciencedaily.com/releases/2009/12/091230183204.htm (accessed August 27, 2014).

Share This




More Earth & Climate News

Wednesday, August 27, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Calif. Quake Underscores Need for Early Warning

Calif. Quake Underscores Need for Early Warning

AP (Aug. 26, 2014) — Researchers at UC Berkeley are testing a prototype of an earthquake early warning system that California is pursuing years after places like Mexico and Japan already have them up and running. (August 26) Video provided by AP
Powered by NewsLook.com
Hurricane Marie Brings Big Waves to California Coast

Hurricane Marie Brings Big Waves to California Coast

Reuters - US Online Video (Aug. 26, 2014) — Huge waves generated by Hurricane Marie hit the Southern California coast. Rough Cut (no reporter narration). Video provided by Reuters
Powered by NewsLook.com
Brazil Tries Genetically Modified Mosquitoes to Fight Dengue

Brazil Tries Genetically Modified Mosquitoes to Fight Dengue

AFP (Aug. 25, 2014) — A factory in the industrial state of Sao Paulo produces genetically modified mosquitoes to fight dengue, a deadly tropical disease more prevalent in Brazil than anywhere else in the world. Duration: 00:57 Video provided by AFP
Powered by NewsLook.com
Raw: Prime Minister at Japan Landslide Site

Raw: Prime Minister at Japan Landslide Site

AP (Aug. 25, 2014) — Japanese Prime Minister Shinzo Abe visited Hiroshima on Monday as rescuers expanded their search for dozens still missing from landslides around the western Japanese city that killed at least 50 people. (Aug. 25) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

    Technology News



    Save/Print:
    Share:  

    Free Subscriptions


    Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

    Get Social & Mobile


    Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

    Have Feedback?


    Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
    Mobile iPhone Android Web
    Follow Facebook Twitter Google+
    Subscribe RSS Feeds Email Newsletters
    Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins