Featured Research

from universities, journals, and other organizations

Scientists 'Reconstruct' Earth's Climate Over The Past Millenium

Date:
December 16, 2003
Source:
NASA/Goddard Space Flight Center
Summary:
Using the perspective of the last few centuries and millennia, speakers in a press onference at the Fall Meeting of the American Geophysical Union in San Francisco discussed the latest research involving climate reconstructions and different climate models.

Using the perspective of the last few centuries and millennia, speakers in a press onference at the Fall Meeting of the American Geophysical Union in San Francisco discussed the latest research involving climate reconstructions and different climate models.

Related Articles


The press conference, held Thursday, December 11, featured Caspar Ammann of the National Center for Atmospheric Research (NCAR), Boulder, Colo.; Drew Shindell of NASA's Goddard Institute for Space Studies, New York; and Tom Crowley of Duke University, Durham, N.C.

Changes in the sun's activity have been considered responsible for some part of past climatic variations. Although useful measurements of solar energy are limited to the last 25 years of satellite data, this record is not long enough to confirm potential trends in solar energy changes over time. Tentative connections between the measured solar activity, with sunspots or the production of specific particles in the Earth's atmosphere (such as carbon-14 and beryllium-10), have been used to estimate past solar energy.

Ammann discussed how he used a set of irradiance estimates with the NCAR coupled Ocean-Atmosphere General Circulation computer model to show the climate system contains a clearly detectable signal from the sun.

Ammann's work with the model also demonstrates that smaller, rather than larger, background trends in the sun's emitted energy are in better agreement with the long-term climate record, as obtained from proxy climate records, such as tree-ring data.

Shindell discussed how he used a climate model that included solar radiation changes, volcanic eruptions, and natural internal variability to arrive at a more accurate look at Earth's changing climate today. Shindell said that while solar radiation changes and volcanoes exert a similar influence on global or hemispheric average-temperature changes, the solar component has the biggest regional effect over time scales of decades to centuries, while volcanoes cause the largest year-to-year changes.

Crowley discussed one of the goals of climate modeling, to test whether moderately reliable predictions of regional climate change can be made under globalwarming scenarios.

Using paleoclimate data, scientists can in some cases test computer climate-model performance. This testing would occur for a time period in which models accurately predict the larger (hemispheric-scale) response to changes in the Earth's radiation balance.

###

NASA's Earth Science Enterprise is dedicated to understanding the Earth as an integrated system and applying Earth System Science to improve prediction of climate, weather and natural hazards using the unique vantage point of space.

NCAR is a research laboratory operated by the University Corporation for Atmospheric Research, a consortium of 67 universities offering doctoral programs in the atmospheric and related sciences. NCAR's primary sponsor is the National Science Foundation.


Story Source:

The above story is based on materials provided by NASA/Goddard Space Flight Center. Note: Materials may be edited for content and length.


Cite This Page:

NASA/Goddard Space Flight Center. "Scientists 'Reconstruct' Earth's Climate Over The Past Millenium." ScienceDaily. ScienceDaily, 16 December 2003. <www.sciencedaily.com/releases/2003/12/031216075809.htm>.
NASA/Goddard Space Flight Center. (2003, December 16). Scientists 'Reconstruct' Earth's Climate Over The Past Millenium. ScienceDaily. Retrieved December 21, 2014 from www.sciencedaily.com/releases/2003/12/031216075809.htm
NASA/Goddard Space Flight Center. "Scientists 'Reconstruct' Earth's Climate Over The Past Millenium." ScienceDaily. www.sciencedaily.com/releases/2003/12/031216075809.htm (accessed December 21, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Sunday, December 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Lava on Track to Hit Hawaii Market

Raw: Lava on Track to Hit Hawaii Market

AP (Dec. 19, 2014) — Lava from an active volcano on Hawaii's Big Island slowed slightly but stayed on track to hit a shopping center in the small town of Pahoa. (Dec. 19) Video provided by AP
Powered by NewsLook.com
Birds Might Be Better Meteorologists Than Us

Birds Might Be Better Meteorologists Than Us

Newsy (Dec. 19, 2014) — A new study suggests a certain type of bird was able to sense a tornado outbreak that moved through the U.S. a day before it hit. Video provided by Newsy
Powered by NewsLook.com
Navy Unveils Robot Fish

Navy Unveils Robot Fish

Reuters - Light News Video Online (Dec. 18, 2014) — The U.S. Navy unveils an underwater device that mimics the movement of a fish. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Arctic Warming Twice As Fast As Rest Of Planet

Arctic Warming Twice As Fast As Rest Of Planet

Newsy (Dec. 18, 2014) — The Arctic is warming twice as fast as the rest of the planet, thanks in part to something called feedback. Video provided by Newsy
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:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

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