Articles and Interviews

4 December 2012

Clearest evidence yet of polar ice losses

30 November 2012
After two decades of satellite observations, an international team of experts brought together by ESA and NASA has produced the most accurate assessment of ice losses from Antarctica and Greenland to date. This study finds that the combined rate of ice sheet melting is increasing.

The new research shows that melting of the Antarctic and Greenland ice sheets has added 11.1 mm to global sea levels since 1992. This amounts to about 20% of all sea-level rise over the survey period.

About two thirds of the ice loss was from Greenland, and the remainder was from Antarctica.

Although the ice sheet losses fall within the range reported by the Intergovernmental Panel on Climate Change in 2007, the spread of the estimate at that time was so broad that it was not clear whether Antarctica was growing or shrinking.

The new estimates are a vast improvement – more than twice as accurate – thanks to the inclusion of more satellite data, and confirm that both Antarctica and Greenland are losing ice.

The study also shows that the combined rate of ice sheet melting has increased over time and, altogether, Greenland and Antarctica are now losing more than three times as much ice, equivalent to 0.95 mm of sea-level rise per year, as they were in the 1990s, equivalent to 0.27 mm of sea level rise per year.

The 47 experts combined observations from 10 different satellite missions to reconcile the differences between dozens of earlier ice sheet studies and produce the first consistent measurement of polar ice sheet changes.

Earth observation satellites are key to monitoring the polar ice because they carry instruments that measure changes in the thickness of the ice sheets, fluctuations in the speed of the outlet glaciers and even small changes in Earth’s gravity field caused by melting ice.

As outlined in the paper ‘A Reconciled Estimate of Ice Sheet Mass Balance’ published today in Science, the researchers carefully matched time periods and survey areas, and combined measurements from European, Canadian, American and Japanese satellites.

The measurement were acquired by instruments such as the radar altimeters and synthetic aperture radars flown on ESA’s ERS-1, ERS-2 and Envisat missions from 1991.

“The success of this venture is due to the cooperation of the international scientific community, and to the provision of precise satellite sensors by our space agencies,” said Professor Andrew Shepherd from the University of Leeds and one of the leaders of the study.

“Without these efforts, we would not be in a position to tell people with confidence how Earth’s ice sheets have changed, and to end the uncertainty that has existed for many years.”

 
Ice loss and sea level rise

The study also found variations in the pace of ice sheet change in Antarctica and Greenland.

“The rate of ice loss from Greenland has increased almost five-fold since the mid-1990s.

“In contrast, while the regional changes in Antarctic ice over time are sometimes quite striking, the overall balance has remained fairly constant – at least within the certainty of the satellite measurements we have to hand,” said co-leader of the study Dr Erik Ivins from NASA’s Jet Propulsion Laboratory.

The Ice Sheet Mass Balance Inter-comparison Exercise is a collaboration between 47 researchers from 26 laboratories, supported by ESA and NASA.

Europe’s Global Monitoring for Environment and Security programme will continue to monitor changes in the polar ice sheets during the coming decades, with the SAR and radar altimeter sensors on the Sentinel-1 and Sentinel-3 satellite series, scheduled to be launched from 2013 onwards.






 
 

 
wwwwww

Drone base multiscale Digital Surface Models to planar areas.

Drone base multiscale Digital Surface Models to planar areas. Dr. Jean A. Doumit   Abstract The obtaining of a Digital Surface models (DSMs) at different scales and levels before the appearance of Unmanned Aerial Vehicles (UAV...
by Lamouchi Helmi
0

 
 
1

Monitoring of Mosul Reservoir Using Remote Sensing TechniquesFor the Period After ISIS Attack in 9 June 2014

Monitoring of Mosul Reservoir Using Remote Sensing TechniquesFor the Period After ISIS Attack in 9 June 2014 Lecture:  Muthanna Mohammed Abdulhameed AL Bayati University of Technology – Baghdad- Building and Construction Dep...
by Lamouchi Helmi
0

 
 
bbbbbb

TOOLS FOR A NEW URBAN AGENDA

  Tullia Valeria Di Giacomo (*); F. Paolo Di Giacomo (**) (*)Alpha Consult, Rome; (**) SOGEIT, Tunis   Keywords: GIS, WEBGIS, Urban Agenda, sustainable development Summary: Urban Authorities, civil society, businesses and kno...
by Lamouchi Helmi
0

 

 
geotunis-2016-banniere

10th edition of the International Congress & technologies dedicated to geospatial applications

The Geographic Information Systems and Geospace Data for sustainable development                              Under the slogan                                    Role of GIS appl...
by Lamouchi Helmi
0

 
 
FORMATION-11-BD

Information Technology Infrastructure Library

Information Technology Infrastructure Library ITIL Oldo-lina Foundation for the French East development in collaboration with the Euro-Arab union Geomatics organizes training for IT Service Management ITIL V3 Will be held in Ly...
by Lamouchi Helmi
0

 
 
1595_481137111962333_1750011374_n

Bluesky’s LiDAR experts educate Mouchel’s water industry professionals

The Mouchel Urban Drainage Academy (MUDA) trains water industry professionals Aerial mapping company Bluesky is helping water industry professionals understand the potential of laser captured height models. Following a request ...
by Lamouchi Helmi
0

 

 
image_42

WEAP’s new version is launched

WEAP (Water Evolution and Planning) has been looking for solutions to preserve fresh water and developing strategies to live within certain water budget in a sustainable manner. WEAP’s teamwork is working in almost all over t...
by Lamouchi Helmi
0

 
 
Untitled-1

Interview with George Gartner

The editing committee of GeoSP has interviewed Mr. George Gartner president of ICA and the international academic researcher about the role of ICA in supporting scientific research and young researchers. Mr. Gartner expressed a...
by Lamouchi Helmi
0

 
 
Pict1_working meeting

Creation of a digital 3-dimensional model

TogliattiKauchuk Plant – Togliatti, Russia  Laser scanning as a method of storage of spatial information is used in various economic sectors. In this article, we will focus on laser scanning for industrial design, or more pr...
by Lamouchi Helmi
0

 

 
p3-gulfstream

AeroMetric Announces New High Accuracy Mapping Solution

Sheboygan, Wisconsin, May 23, 2013 – AeroMetric announced the addition of a new High Accuracy Mapping Solution for its clients. The new solution is designed to obtain tight vertical accuracy and highly detailed imagery...
by Lamouchi Helmi
0

 
 
téléchargement

Learn to Use Esri’s Collector for ArcGIS on Your Smartphone

You can work with maps in the field using Esri’s Collector for ArcGIS app on your iPhone or Android smartphone. You can also use maps to capture spatial and tabular data with the phone’s GPS or by tapping on the map...
by Lamouchi Helmi
0

 
 
Untitled-1

Signing a collaboration protocol between the Euro-Arab Union of Geomatics and the Arab Union of Survey

A collaboration protocol was signed on Wednesday morning May 15,2013 inthe Euro-Arab Union of geomatics office inBeirut,Lebanon. The protocol states the technical and scientific cooperation between academics and professionals i...
by Lamouchi Helmi
0

 




0 comments »


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

*

* Copy This Password *

* Type Or Paste Password Here *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>