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Glaciers

Glaciers are retreating at alarming rates

In Torres del Paine and Bernardo O’Higgins National Parks we were able to get up close and personal with some major glaciers in Southern Chile. All of the glaciers we witnessed were part of the Southern Ice Field which is just one piece of the former Patagonia Ice Field. The Southern Ice Field is the largest Ice Field in the Southern Hemisphere that is not part of the Arctic, meaning that it is an incredibly important freshwater reserve. While glaciers are constantly moving and changing, recent studies have shown that 90% of the Patagonian output glaciers have shrunk since the last ice age in 1870 AD (1). Many different studies are working to determine what is causing a recent increase in melting speeds, with warming atmospheric conditions, more rain events, and interaction with marine environments listed as the main perpetrators (1).

 

Looking specifically at Glacier Grey in Torres del Paine National Park, information is posted showing how quickly the glacier has been retreating. The two images below show a diagram posted at a lookout point in the park, detailing the retreat of Glacier Grey over the years, as well as some other information. The third photo is one that I took, including the glacier and the island mentioned on the information board.

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(1) Interpretive information board at a Glacier Grey lookout point in Torres del Paine National Park.

(2) A closer image of the section depicting the melting events of Glacier Grey on the information board shown previously. 

(3) An actual image of Glacier Grey and Nunatak Island as seen from the lookout point. Taken on July 13, 2023. 

So what? 

Like I previously mentioned, the Southern Ice Field (shown below), and other components of the former Patagonia Ice Field, represent a large concentration of fresh water. All over the world water scarcity is becoming more and more of a problem, meaning that these freshwater reserves are going to be essential in the near future.

 

All of the glacial melt has to go somewhere. Glacier Grey terminates into a lake, so all of the glacial melt collects there with high concentrations of minerals and sediments that were previously trapped in the glacier. The other two glaciers we saw, the Serrano and Balmaceda Glaciers, terminates in a fjord that eventually connects to the Atlantic Ocean. This means that all of the glacial melt from those two glaciers, plus any other glacier that eventually connects to the ocean, is contributing to sea level rise. The melting of the collection of the former Patagonia Ice Field has resulted in approximately 10% of sea level rise attributed to glaciers and icecaps worldwide, making it a major source of global sea level rise (1).

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(1) An image from NASA showing the entirety of the Southern Ice Field (7)

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Balmaceda Glacier in Bernardo O'Higgins National Park

References

(1) Bendle, Jacob. “The Patagonian Icefields Today.” AntarcticGlaciers.Org, 22 June 2020, https://www.antarcticglaciers.org/glacial-geology/patagonian-ice-sheet/the-patagonian-icefields/.

 

(2) “Bernardo O’Higgins National Park - Tour of Patagonia, What to See.” GoChile, https://www.gochile.cl/en/articles/reasons-why-you-have-to-visit-bernardo-ohiggins-national-park.htm. Accessed 10 Aug. 2023.

 

(3) Davies, Bethan. “Shrinking Patagonian Glaciers.” AntarcticGlaciers.Org, 22 June 2020, https://www.antarcticglaciers.org/glaciers-and-climate/glacier-recession/shrinking-patagonian-glaciers/.

 

(4) Gardner, Alex S., et al. “A Reconciled Estimate of Glacier Contributions to Sea Level Rise: 2003 to 2009.” Science (New York, N.Y.), vol. 340, no. 6134, May 2013, pp. 852–57. PubMed, https://doi.org/10.1126/science.1234532.

 

(5) Ice Sheet. https://education.nationalgeographic.org/resource/ice-sheet. Accessed 10 Aug. 2023.

 

(6) South Patagonian Icefield. NASA Earth Observatory, 28 June 2017, https://earthobservatory.nasa.gov/images/90464/south-patagonian-icefield.

 

(7) Southern Patagonian Ice Field | LAC Geo. https://lacgeo.com/southern-patagonian-ice-field. Accessed 10 Aug. 2023.

 

(8) “What Is Iceberg Calving, and Why Does It Matter?” CPOM, https://cpom.org.uk/what-is-iceberg-calving-and-why-does-it-matter/. Accessed 10 Aug. 2023.

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