Featured Research

from universities, journals, and other organizations

Ancient Supervolcano's Eruption Caused Decade Of Severe Winters

Date:
July 6, 2009
Source:
American Geophysical Union
Summary:
Previous studies have suggested that Indonesia's Toba supervolcano, when it erupted about 74,000 years ago, triggered a 1,000-year episode of ice sheet advance, and also may have produced a short-lived "volcanic winter," which drastically reduced the human population at the time. Researchers have now found that none of the models to simulate the supervolcanic eruption initiate glaciation.

Previous studies have suggested that Indonesia's Toba supervolcano, when it erupted about 74,000 years ago, triggered a 1,000-year episode of ice sheet advance, and also may have produced a short-lived "volcanic winter," which drastically reduced the human population at the time.

Previous climate model simulations of the eruption have been unable to produce the glaciation, and there are no climate observations to support the volcanic winter.

To investigate additional mechanisms that may have enhanced and extended the effects of the Toba eruption, as well as the volcanic winter, Robock et al. conduct six climate model simulations using state-of-the-art models that include vegetation death effects on radiation budgets, and stratospheric chemistry feedbacks that might affect the lifetime of the volcanic cloud. The authors use a wide variety of aerosol injection volumes, ranging from 33 to 900 times that of the 1991 Mount Pinatubo injection.

They find that none of the models initiate glaciation. Nonetheless, they produce a decade of severe volcanic winter, which would likely have had devastating consequences for humanity and global ecosystems, supporting the idea that the Toba eruption produced a genetic bottleneck in human evolution.


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. Robock et al. Did the Toba volcanic eruption of ~74 ka B.P. produce widespread glaciation? Journal of Geophysical Research, 2009; 114 (d10): D10107 DOI: 10.1029/2008JD011652

Cite This Page:

American Geophysical Union. "Ancient Supervolcano's Eruption Caused Decade Of Severe Winters." ScienceDaily. ScienceDaily, 6 July 2009. <www.sciencedaily.com/releases/2009/07/090702170128.htm>.
American Geophysical Union. (2009, July 6). Ancient Supervolcano's Eruption Caused Decade Of Severe Winters. ScienceDaily. Retrieved September 22, 2014 from www.sciencedaily.com/releases/2009/07/090702170128.htm
American Geophysical Union. "Ancient Supervolcano's Eruption Caused Decade Of Severe Winters." ScienceDaily. www.sciencedaily.com/releases/2009/07/090702170128.htm (accessed September 22, 2014).

Share This



More Earth & Climate News

Monday, September 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Will Climate Rallies Spur Change?

Will Climate Rallies Spur Change?

Newsy (Sep. 21, 2014) Organizers of the People's Climate March and other rallies taking place in 166 countries hope to move U.N. officials to action ahead of their summit. Video provided by Newsy
Powered by NewsLook.com
Thousands March in NYC Over Climate Change

Thousands March in NYC Over Climate Change

AP (Sep. 21, 2014) Accompanied by drumbeats, wearing costumes and carrying signs, thousands of demonstrators filled the streets of Manhattan and other cities around the world on Sunday to urge policy makers to take action on climate change. (Sept. 21) Video provided by AP
Powered by NewsLook.com
Climate Change Rally Held in India Ahead of UN Summit

Climate Change Rally Held in India Ahead of UN Summit

AFP (Sep. 20, 2014) Some 125 world leaders are expected to commit to action on climate change at a UN summit Tuesday called to inject momentum in struggling efforts to tackle global warming. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
New Music With Recycled Instruments at Colombia Fest

New Music With Recycled Instruments at Colombia Fest

AFP (Sep. 19, 2014) Jars, bottles, caps and even a pizza box, recovered from the trash, were the elements used by four musical groups at the "RSFEST2014 Sonorities Recycling Festival", in Colombian city of Cali. Duration: 00:49 Video provided by AFP
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