Featured Research

from universities, journals, and other organizations

ICEsat's Lasers Measure Ice, Clouds And Land Elevations

Date:
October 7, 2003
Source:
NASA/Goddard Space Flight Center
Summary:
NASA's Ice, Cloud and land Elevation Satellite (ICESat) has resumed measurements of the Earth's polar ice sheets, clouds, mountains and forests with the second of its three lasers. Crisscrossing the globe at nearly 17,000 miles per hour, this new space mission is providing data with unprecedented accuracy on the critical third dimension of the Earth, its vertical characteristics.

NASA's Ice, Cloud and land Elevation Satellite (ICESat) has resumed measurements of the Earth's polar ice sheets, clouds, mountains and forests with the second of its three lasers. Crisscrossing the globe at nearly 17,000 miles per hour, this new space mission is providing data with unprecedented accuracy on the critical third dimension of the Earth, its vertical characteristics.

"The first set of laser measurements is revealing features of the polar ice sheets with details never seen before, and is detecting dust storms, cloud heights, tree heights and smoke from forest fires in new and exciting ways," said Jay Zwally, ICESat Project Scientist at NASA's Goddard Space Flight Center, Greenbelt, Md.

The principal mission of ICESat is to measure the surface elevation of the large ice sheets covering Antarctica and Greenland. Measurements of elevation-change over time will show whether the ice sheets are melting or growing as the Earth's climate undergoes natural and human-induced changes.

The Geoscience Laser Altimeter System (GLAS) instrument on ICESat sends short pulses of green and infrared light though the sky 40 times a second, all over the globe, and collects the reflected laser light in a one-meter telescope. The elevation of the Earth's surface and the heights of clouds and aerosols in the atmosphere are calculated from both precise measurements of the travel time of the laser pulses, and ancillary measurements of the satellite's orbit and instrument orientation. This marks the first time any satellite has made vertical measurements of the Earth through the use of an onboard light source.

Operating in a near-polar orbit, ICESat is adding to our understanding of the mass-balance of the Greenland and Antarctic ice sheets. ICESat's first topographic profiles across Antarctica revealed details of features such as the ice streams of the Siple Coast and the Amery Ice Shelf, as well as the atmospheric phenomena above them.

ICESat is also making unique measurements of cloud heights and global distribution. ICESat detects distributions of aerosols from sources such as dust storms and forest fires. And because its laser pulses continuously, ICESat also measures the Earth's topography with high accuracy.

"ICESat has already demonstrated the unique capability of lasers to make a variety of Earth Science measurements. When the calibration experiments are completed, we believe the accuracy and sensitivity will exceed previous capabilities by nearly an order of magnitude," stated Bob Schutz, GLAS Science Team Leader, of the University of Texas at Austin.

ICESat was launched January 12, 2003, on a Boeing Delta II rocket from Vandenberg Air Force Base, Calif. On March 29, ICESat's Laser 1 unexpectedly stopped working after providing 36 days of data. NASA will issue a report shortly on the reason for the anomaly.

"Despite the problem with the first laser, ICESat is providing a new perspective on elements within the Earth System with amazing accuracy. We are especially looking forward to the information this capability will provide on how the polar ice sheets are changing," said Waleed Abdalati, ICESat Program Scientist at NASA Headquarters, Washington.

The ICESat scientists will convene a special session to present the latest results from ICESat at the 2003 Fall Meeting of the American Geophysical Union in San Francisco.

ICESat is the latest in a series of NASA's Earth observation spacecraft designed to study the environment of our home planet and how it may be changing. 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.

For more information and images on the Internet, visit:

http://www.gsfc.nasa.gov/topstory/2003/0920icesatfirst.html

http://icesat.gsfc.nasa.gov

For more information about NASA's Earth Science Enterprise on the Internet, visit:

http://www.earth.nasa.gov


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. "ICEsat's Lasers Measure Ice, Clouds And Land Elevations." ScienceDaily. ScienceDaily, 7 October 2003. <www.sciencedaily.com/releases/2003/10/031007055221.htm>.
NASA/Goddard Space Flight Center. (2003, October 7). ICEsat's Lasers Measure Ice, Clouds And Land Elevations. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2003/10/031007055221.htm
NASA/Goddard Space Flight Center. "ICEsat's Lasers Measure Ice, Clouds And Land Elevations." ScienceDaily. www.sciencedaily.com/releases/2003/10/031007055221.htm (accessed September 1, 2014).

Share This




More Earth & Climate News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Iceland Lowers Aviation Alert on Volcano

Iceland Lowers Aviation Alert on Volcano

AFP (Sep. 1, 2014) Iceland has lowered its aviation alert on its largest volcano after a fresh eruption on a nearby lava field prompted authorities to enforce a flight ban for several hours. Duration: 01:07 Video provided by AFP
Powered by NewsLook.com
Lightning Hurts 3 on NYC Beach

Lightning Hurts 3 on NYC Beach

AP (Sep. 1, 2014) A lightning strike injured three people on a New York City beach on Sunday. The storms also delayed flights and interrupted play at the US Open tennis tournament. (Sept. 1) Video provided by AP
Powered by NewsLook.com
Thailand Totters Towards Waste Crisis

Thailand Totters Towards Waste Crisis

AFP (Sep. 1, 2014) Fears are mounting in Bangkok that poor planning and lax law enforcement are tipping Thailand towards a waste crisis. Duration: 01:21 Video provided by AFP
Powered by NewsLook.com
Melting Ice Shelves Drive Rapid Antarctic Sea Level Rise

Melting Ice Shelves Drive Rapid Antarctic Sea Level Rise

Newsy (Sep. 1, 2014) A study of almost 20 years' worth of satellite images shows Antarctic sea levels are on the rise as ice shelves continue to melt. 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:
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