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Home NEWS Science News Health

Glacier Loss Day indi­cates record break­ing glacier melt

Bioengineer by Bioengineer
September 19, 2023
in Health
Reading Time: 3 mins read
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View of Hintereisferner Glacier
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The Hintereisferner, located at the back of the Tyrolean Ötztal, has been closely monitored for more than 100 years, and there have been continuous records of its mass balance since 1952. This makes it one of the best-studied glaciers in the Alps and has been key to glacier and climate research at the University of Innsbruck for decades. Since 2016, the researchers have also been surveying the glacier with a worldwide unique system: the surface of the glacier is scanned daily with a terrestrial laser scanner returning the glacier surface elevation changes. This way, the change in the volume of the Hintereisferner is monitored in real time. Innsbruck glaciologist Annelies Voordendag led the measurement on site at the Hintereisferner, the results of the researchers’ investigations have now been published as highlighted article in the journal The Cryosphere.

View of Hintereisferner Glacier

Credit: www.foto-webcam.eu

The Hintereisferner, located at the back of the Tyrolean Ötztal, has been closely monitored for more than 100 years, and there have been continuous records of its mass balance since 1952. This makes it one of the best-studied glaciers in the Alps and has been key to glacier and climate research at the University of Innsbruck for decades. Since 2016, the researchers have also been surveying the glacier with a worldwide unique system: the surface of the glacier is scanned daily with a terrestrial laser scanner returning the glacier surface elevation changes. This way, the change in the volume of the Hintereisferner is monitored in real time. Innsbruck glaciologist Annelies Voordendag led the measurement on site at the Hintereisferner, the results of the researchers’ investigations have now been published as highlighted article in the journal The Cryosphere.

“Already in the early summer of 2022, it became clear that the day when the ice the glacier gained during the winter starts melting away would be reached very soon. We call this day the ‘Glacier Loss Day’ or GLD for short. It can be compared to the Earth Overshoot Day, which marks the date when we use up more natural resources than the Earth can renew in a year”, explains Annelies Voordendag. Monitoring a glacier’s volume and mass alterations on a daily basis provides a quick assessment of its condition in a given year.

Observing glaciers’ health

When the GLD arrives, it means the glacier is no longer in balance with the natural conditions for that year. The earlier the GLD happens, the more time is left in the remaining summer that the glacier likely will lose volume and thus, mass. “We track the daily volume changes with the automated terrestrial laser scanninng setup overlooking the glacier and derive the day that the mass gained during winter has been lost”, says Voordendag. In 2022 the GLD was measured on the 23rd of June. In the two previous years, Glacier Loss Day was reached only in the middle of August. Also in years with negative balance extremes – such as 2003 and 2018 – this day was not reached until the end of July. Even if not every summer in the future will necessarily be like the one in 2022, the trend is clear for the glaciologists, because the developments lie outside normal fluctuation ranges: “These are clear signals of anthropogenic climate change. The consequences of our greenhouse gas emissions are already hitting us hard today,” adds glaciologist Rainer Prinz from the “Ice and Climate” working group in Innsbruck. The future projections of development do not present an encouraging outlook either. Only half of the Hintereisferner will be left in 10 to 20 years,” the team summarizes in their study. These are clear climate change signals that are due to anthropogenic global warming and the consequences of our greenhouse gas emissions, which are already fully affecting us today.”



Journal

The Cryosphere

DOI

10.5194/tc-17-3661-2023

Method of Research

Observational study

Subject of Research

Not applicable

Article Title

Brief communication: The Glacier Loss Day as an indicator of a record-breaking negative glacier mass balance in 2022

Article Publication Date

29-Aug-2023

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