NASA Mission Takes Stock of Earth’s Melting Land Ice

MEDIA RELATIONS OFFICE
JET PROPULSION LABORATORY
CALIFORNIA INSTITUTE OF TECHNOLOGY
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION
PASADENA, CALIF. 91109 TELEPHONE 818-354-5011
http://www.jpl.nasa.gov

Alan Buis 818-354-0474
Jet Propulsion Laboratory, Pasadena, Calif.
Alan.buis@jpl.nasa.gov

Steve Cole 202-358-0918
NASA Headquarters, Washington
Stephen.e.cole@nasa.gov

News release: 2012-036 Feb. 8, 2012

NASA Mission Takes Stock of Earth's Melting Land Ice

The full version of this story with accompanying images is at:
http://www.jpl.nasa.gov/news/news.cfm?release=2012-036&cid=release_2012-036

PASADENA, Calif. – In the first comprehensive satellite study of its kind, a University of Colorado
at Boulder-led team used NASA data to calculate how much Earth's melting land ice is adding to
global sea level rise.

Using satellite measurements from the NASA/German Aerospace Center Gravity Recovery and
Climate Experiment (GRACE), the researchers measured ice loss in all of Earth's land ice between
2003 and 2010, with particular emphasis on glaciers and ice caps outside of Greenland and
Antarctica.

The total global ice mass lost from Greenland, Antarctica and Earth's glaciers and ice caps during the
study period was about 4.3 trillion tons (1,000 cubic miles), adding about 0.5 inches (12 millimeters)
to global sea level. That's enough ice to cover the United States 1.5 feet (0.5 meters) deep.

"Earth is losing a huge amount of ice to the ocean annually, and these new results will help us answer
important questions in terms of both sea rise and how the planet's cold regions are responding to
global change," said University of Colorado Boulder physics professor John Wahr, who helped lead
the study. "The strength of GRACE is it sees all the mass in the system, even though its resolution is
not high enough to allow us to determine separate contributions from each individual glacier."

About a quarter of the average annual ice loss came from glaciers and ice caps outside of Greenland
and Antarctica (roughly 148 billion tons, or 39 cubic miles). Ice loss from Greenland and Antarctica
and their peripheral ice caps and glaciers averaged 385 billion tons (100 cubic miles) a year. Results
of the study will be published online Feb. 8 in the journal Nature.

Traditional estimates of Earth's ice caps and glaciers have been made using ground measurements
from relatively few glaciers to infer what all the world's unmonitored glaciers were doing. Only a few
hundred of the roughly 200,000 glaciers worldwide have been monitored for longer than a decade.

One unexpected study result from GRACE was that the estimated ice loss from high Asian mountain
ranges like the Himalaya, the Pamir and the Tien Shan was only about 4 billion tons of ice annually.
Some previous ground-based estimates of ice loss in these high Asian mountains have ranged up to
50 billion tons annually.

"The GRACE results in this region really were a surprise," said Wahr, who is also a fellow at the
University of Colorado-headquartered Cooperative Institute for Research in Environmental Sciences.
"One possible explanation is that previous estimates were based on measurements taken primarily
from some of the lower, more accessible glaciers in Asia and extrapolated to infer the behavior of
higher glaciers. But unlike the lower glaciers, most of the high glaciers are located in very cold
environments and require greater amounts of atmospheric warming before local temperatures rise
enough to cause significant melting. This makes it difficult to use low-elevation, ground-based
measurements to estimate results from the entire system."

"This study finds that the world's small glaciers and ice caps in places like Alaska, South America
and the Himalayas contribute about 0.02 inches per year to sea level rise," said Tom Wagner,
cryosphere program scientist at NASA Headquarters in Washington. "While this is lower than
previous estimates, it confirms that ice is being lost from around the globe, with just a few areas in
precarious balance. The results sharpen our view of land-ice melting, which poses the biggest, most
threatening factor in future sea level rise."

The twin GRACE satellites track changes in Earth's gravity field by noting minute changes in
gravitational pull caused by regional variations in Earth's mass, which for periods of months to years
is typically because of movements of water on Earth's surface. It does this by measuring changes in
the distance between its two identical spacecraft to one-hundredth the width of a human hair.

The GRACE spacecraft, developed by NASA's Jet Propulsion Laboratory, Pasadena, Calif., and
launched in 2002, are in the same orbit approximately 137 miles (220 kilometers) apart. The
California Institute of Technology manages JPL for NASA.

For more on GRACE, visit: http://www.csr.utexas.edu/grace and http://grace.jpl.nasa.gov .

For more information about NASA and agency programs, visit: http://www.nasa.gov .

JPL is managed for NASA by the California Institute of Technology in Pasadena.

Additional media contact: Jim Scott, CU-Boulder, 303-492-3114, jim.scott@colorado.edu .

-end-

To remove yourself from this mailing, please go to http://www.kintera.org/TR.asp?a=8rKJK0MIIlLWL5PQG&s=fpJSLSMtEbKEIRMzEpF&m=mvLYK9OVLoK2KmJ

To remove yourself from all mailings from NASA Jet Propulsion Laboratory, please go to http://www.kintera.org/TR.asp?a=buLPL9NUKoK2JfO3E&s=fpJSLSMtEbKEIRMzEpF&m=mvLYK9OVLoK2KmJ