Subscribe to our free daily newsletters
. 24/7 Space News .

Subscribe to our free daily newsletters

 Tree World Pumps Up The Oxygen
New Haven - March 7, 2000 - Yale researchers have attributed ancient high levels of oxygen in the atmosphere to the rise of trees and large plants. A new method of calculating oxygen in the Earth's atmosphere suggests that an increase more than 300 million years ago was caused by the rise and spread of trees and other vascular land plants, a Yale study finds.

The new plant life produced dead organic matter resistant to decomposition by bacteria that was buried in sediments, and, as a result, extra oxygen was added to the atmosphere by increased global photosynthesis, according to Robert A. Berner, the Alan M. Bateman Professor of Geology and Geophysics at Yale.

"The rise of large vascular land plants had a significant effect on atmospheric composition, both oxygen and carbon dioxide," said Berner.

The higher concentrations of oxygen lasted for 100 million years and were significantly higher than the Earth's current oxygen content of 21 percent.

Published in the March 3 issue of Science, the study shows that the calculated high oxygen levels during this period verify earlier independent estimates and that this high oxygen may have been an important factor in affecting the evolution of giant insects.

The study's theoretical calculations rest partly on experimental work on land plant growth at the University of Sheffield in England by David Beerling and his associates and on marine plankton growth at the University of Hawaii by a team led by Edward Laws and Brian Popp.

"As a result of these experiments, we were better able to calculate realistic changes in atmospheric oxygen over geologic time," Berner said.

In addition to Berner, Beerling, Laws and Popp, the study's team included former Yale graduate student, Steven T. Petsch, and J. A. Lake, W.P. Quick, and F.I. Woodward from the University of Sheffield in England; and R.S. Lane, M.B. Westley and N. Cassar from the University of Hawaii.

  • Yale

     Martian Meteorites Reveal Clues To Atmospheric Processes
    San Diego - March 1, 2000 - Detailed measurements of sulfur isotopes in five Martian meteorites have enabled researchers at the University of California, San Diego to determine that the abundant sulfur on the surface of Mars is due largely to chemical reactions in the Red Planet's atmosphere that are similar to those that occur in Earth's atmosphere.

    Thanks for being here;
    We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

    With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

    Our news coverage takes time and effort to publish 365 days a year.

    If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

    SpaceDaily Contributor
    $5 Billed Once

    credit card or paypal
    SpaceDaily Monthly Supporter
    $5 Billed Monthly

    paypal only

    Memory Foam Mattress Review
    Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
    XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News

  • The content herein, unless otherwise known to be public domain, are Copyright 1995-2016 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.