ESA - European Space Agency (new) patch.
6 December 2018
Using a 25-year record of ESA satellite data, recent research shows that the pace at which Greenland is losing ice is getting faster.
The research, published in Earth and Planetary Science Letters, uses radar altimetry data gathered by the ERS, Envisat and CryoSat missions between 1992 and 2016.
Losing ice
Over time, these measurements are used, for example, to work out how the height – or elevation – of huge ice sheets is changing, which, in turn, can be used to monitor ice loss.
Sentinel family
Although the research team, working through ESA’s Climate Change Initiative, found only modest elevation changes in the early 1990s, the pace of thinning is clear in the satellite observations from 2003 onwards.
“A pattern of thinning appears to dominate a large fraction of the ice sheet margins at the beginning of the millennium, with individual outlet glaciers exhibiting large thinning rates,” says Louise Sandberg Sørensen, the paper’s lead author.
Greenland ice change, 2015
“Over the full 25-year period, the general picture shows much larger volume losses are experienced in west, northwest and southeast basins of Greenland compared to the more steady-state situations in the colder far north.”
This, according to Dr Sørensen, highlights the strong climate sensitivity of the outlet glaciers of Greenland as well as the ongoing need for reliable, long-term monitoring of climate variables that help to improve climate models and inform policy responses.
The Greenland ice sheet is an important cog in the global climate system with its meltwater, for example, influencing ocean circulation in the North Atlantic. Ongoing monitoring of the ice sheet is equally important in understanding its contribution to the extent and changing rate in sea-level rise.
The more recent Copernicus Sentinel-3 mission is also being used to monitor changing ice height.
Greenland ice height from Sentinel-3B
ESA’s Climate Change Initiative is a research programme that uses four decades of Earth observation archives established by ESA and its Member States to support the climate information requirements of the United Nations Framework Convention on Climate Change.
In addition to the Greenland ice sheet, the programme is developing long-term, consistent data products based on satellite derived observations for a further 22 essential climate variables required by the international science community to understand the Earth system.
Related links:
Earth and Planetary Science Letters: https://www.sciencedirect.com/science/article/pii/S0012821X18302863?via%3Dihub
ESA's Climate Change Initiative: http://cci.esa.int/
DTU National Space Institute: http://www.space.dtu.dk/english/about_nsi
Nansen Environmental and Remote Sensing Center: http://www.nersc.no/index2.php
Related missions:
CryoSat: http://www.esa.int/Our_Activities/Observing_the_Earth/CryoSat
Envisat: http://www.esa.int/Our_Activities/Observing_the_Earth/Envisat
ERS: http://www.esa.int/Our_Activities/Observing_the_Earth/ERS_overview
Earth observation: http://www.esa.int/Our_Activities/Observing_the_Earth
Images, Text, Credits: ESA/Planetary Visions/Contains modified Copernicus Sentinel data (2018), processed by ESA.
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