While Greenland and Antarctica are losing masses of ice, so too are most of the glaciers around the world, but its challenging to measure how much ice they are shedding. This can be imagined as a huge ice cube, bigger than Europes highest mountain. This can be imagined as a giant ice cube, bigger than Europes highest mountain, which is quite shocking. Notably, we likewise found that air temperature level, which triggers the ice surface to melt, accounts for 89% of this ice loss.”
Dr. Gourmelen said, “The relative contribution of decreasing surface area mass balance and increasing ice discharge to sea-level modification is well known for the Greenland and Antarctic ice sheets.
A paper, published on April 26, 2023, in the journal Geophysical Research Letters, describes how scientists have utilized a specific technique of processing CryoSat data to reveal that glaciers lost a tremendous 2720 Gigatonnes of ice between 2010 and 2020.
Their research study also shows that higher air temperature levels are accountable for 89% of this ice loss.
Thanks to ESAs CryoSat satellite and an advancement method of using its information, scientists have found that glaciers worldwide have diminished by a total of 2% in just 10 years, and its because of higher air temperatures. Credit: ESA/Planetary Visions
Glaciers in high-mountain Asia alone supply water for over 1.3 billion people. Glaciers are also crucial for markets such as hydropower.
The demise of glaciers around the world is, therefore, set to cause major problems for local populations and those depending on outflow water even more downstream.
In addition, ice being lost from glaciers is contributing more to sea-level rise than the ice being lost from either of the giant ice sheets on Greenland and Antarctica.
In spite of mountain glaciers being crucial indicators of environment modification and being essential to society, estimates of worldwide glacier mass loss have actually remained restricted to a couple of clinical research studies. This is because there are numerous useful challenges in mapping and tracking glaciers, which tend to depend on intricate rugged terrain, and due to the fact that there isnt a particular satellite objective dedicated to doing this.
ESAs Earth Explorer CryoSat objective is committed to precise monitoring of modifications in the thickness of marine ice drifting in the polar oceans and variations in the density of the large ice sheets that blanket Greenland and Antarctica. Credit: ESA/AOES Medialab
Noel Gourmelen, from the University of Edinburgh in the UK, stated, “Im sure many people have seen pictures taken at different times that show how a glacier terminus has pulled away in time. And we can see this from satellite images too.
” But we require to determine how a glaciers volume is altering to really understand what is happening.”
The research team turned to ESAs CryoSat satellite, which brings a radar altimeter to determine the height of ice surfaces. This works well for determining water level and the height of sea ice, which is utilized to work out how ice density changes, and for determining huge polar ice sheets.
However, the footprint of this type of instrument is too coarse to measure and keep an eye on mountain glaciers.
” Some years back, we established a technique of processing CryoSat data, called swath processing, which has actually transformed using CryoSat information over complex icy surfaces. It reveals a wealth of brand-new detail on glaciers,” kept in mind Dr Gourmelen.
Livia Jakob, from Earthwave in the UK, described, “Weve had the ability to utilize this strategy to study glaciers all over the world and we can report that, in overall, mountain glaciers lost 2% of their volume in between 2010 and 2020.
” That includes up to 2720 Gigatonnes in all. This can be thought of as a huge ice, bigger than Europes greatest mountain, which is quite stunning. Notably, we also discovered that air temperature level, which triggers the ice surface area to melt, accounts for 89% of this ice loss.”
While warmer air temperature levels are accountable for this decreasing surface mass balance, the research study group found that something called ice discharge was accountable for the other 11% of ice lost.
This is connected with glaciers that terminate at the coast, where warmer ocean waters are largely responsible for thinning the front of the ice circulation.
Dr. Gourmelen stated, “The relative contribution of reducing surface area mass balance and increasing ice discharge to sea-level modification is well understood for the Greenland and Antarctic ice sheets. Now we understand more about how the atmosphere and ocean are teaming up to melt glaciers. There is still lots of work to do to fine-tune these numbers, and to include this knowledge into our glacier forecasts.”
Stephen Plummer from ESA explains, “The ingenious work utilizing CryoSat in swath altimetry mode shows the worth of its altimeter for keeping an eye on glaciers, hence achieving one of the objectives secondary objectives.
” This work laid the basis for the Glacier Mass Balance intercomparison Exercise, Glambie, to fix up the different price quotes of glacier mass balance from a wide variety of satellite and in-situ approaches. It also helps in assisting the design of the Copernicus Sentinel Expansion CRISTAL mission for monitoring land ice, guaranteeing continuity in keeping track of glaciers internationally.”
Recommendation: “Glacier Mass Loss Between 2010 and 2020 Dominated by Atmospheric Forcing” by Livia Jakob and Noel Gourmelen, 26 April 2023, Geophysical Research Letters.DOI: 10.1029/ 2023GL102954.
The teams research study, which is supported by ESAs Earth Observation Science for Society program, was provided at the European Geosciences Union General Assembly, occurring this week in Austria.
While Greenland and Antarctica are losing masses of ice, so too are the majority of the glaciers around the globe, but its difficult to determine just how much ice they are shedding. Thanks to ESAs CryoSat satellite and a development way of utilizing its data, researchers have actually found that glaciers worldwide have actually diminished by an overall of 2% in simply 10 years. That amounts to 2720 Gigatonnes in all. This can be thought of as a huge ice cube, larger than Europes greatest mountain. Credit: ESA/Planetary Visions
Scientists have actually used data from ESAs CryoSat satellite to expose that global glaciers diminished by 2%, losing 2720 Gigatonnes of ice from 2010 to 2020, with 89% of the loss due to greater air temperatures. This glacier reduction, which threatens freshwater supply and contributes more to sea-level increase than the ice loss from polar ice sheets, was provided at the European Geosciences Union General Assembly in Austria.
When one thinks about the damage that climate modification is doing, its likely that what comes to mind is a vision of substantial swellings of ice dropping off among the polar ice sheets and crashing into the ocean. While Greenland and Antarctica are losing masses of ice, so to are most of the glaciers all over the world, but its tricky to measure just how much ice they are shedding.
Thanks to ESAs CryoSat satellite and an advancement way of using its data, researchers have actually found that glaciers worldwide have shrunk by a total of 2% in simply 10 years, and its due to the fact that of higher air temperatures.
