Mer de Glace

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Mer de Glace
Sea of Ice
Mer de Glace 4.JPG
France relief location map.jpg
Red pog.svg
Mer de Glace located in France Map
LocationNorthern slopes of the Mont Blanc massif
Coordinates 45°54′58″N6°56′14″E / 45.91611°N 6.93722°E / 45.91611; 6.93722 Coordinates: 45°54′58″N6°56′14″E / 45.91611°N 6.93722°E / 45.91611; 6.93722
Length7.5 km (4.7 mi); 12 km (7.5 mi) total length.

The Mer de Glace ("Sea of Ice") is a valley glacier located on the northern slopes of the Mont Blanc massif, in the French Alps. It is 7.5 km long and 200 metres (660 ft) deep but, when all its tributary glaciers are taken into account, it can be regarded as the longest and largest glacier in France, and the second longest in the Alps after the Aletsch Glacier. [1] [2] :5,20

Contents

I can no otherwise convey to you an image of this body of ice, broken into irregular ridges and deep chasms than by comparing it to waves instantaneously frozen in the midst of a violent storm.

William Coxe 1777

Geography

The glacier lies above the Chamonix valley. The pressure within the ice is known to reach at least 30 atmospheres. [3] The Mer de Glace can be considered as originating at an elevation of 2,100 metres (6,900 ft), just north of the Aiguille du Tacul, where it is formed by the confluence of the Glacier de Leschaux and the Glacier du Tacul. The former is fed by the Glacier du Talefre, whilst the latter is, in turn, fed by the Glacier des Periardes, the vast Glacier du Géant and the broad icefields of the Vallee Blanche. The Glacier du Tacul supplies much more ice than the Glacier de Leschaux. [2] :20

Mer de Glace, circa 1870 Fotografi av glaciaren Mer de Glace - Hallwylska museet - 103137.tif
Mer de Glace, circa 1870

However, if the Mer de Glace is considered in its broadest sense (i.e. from source to tongue), it is a compound valley glacier, gaining ice from snowfields that cover the heights directly north of Mont Blanc at an altitude of around 4,000 metres. It flows for a total distance of 12 kilometres, covering an area of 32 square kilometres in the central third of the Mont Blanc massif. [2] :6,21

From the Aiguille du Tacul, the Mer de Glace flows north-north-west between Aiguille du Moine on the east and Trélaporte on the west. It descends below Montenvers, at which point it is approximately 0.5 km wide, and descends to approximately 1,500 metres (4,900 ft). The glacier was once easily visible from Chamonix but has been shrinking backwards, and is now barely visible from below. [2] :20 [4] The surface topography of the Mer de Glace changed very little during the first third of the 20th century, but from 1939 to 2001 the surface of the glacier has lowered an average of 30 cm each year, corresponding to an equivalent loss of 700 million cubic metres of water. [2] :126

Mer de Glace, 2011 Mer de Glace 1.jpg
Mer de Glace, 2011

When the tension in the ice increases as the slope increases, the glacier is unable to deform and crevasses appear. These are notably transversal and, when there is intense crevasse activity on the steepest terrain, blocks of seracs appear as the glacier breaks up. Crevasses are of variable depth, depending on their position, and may be as deep as fifty metres. Seracs always form in the same places, namely the steepest sections over which the glacier flows. As crevasses open and seracs tumble downstream, the supply of ice is renewed by the constant flow from upstream. Broad banding patterns, visible on the surface of the Mer de Glace, are known as ogives, or Forbes bands, and result from differences in summer and winter collapse rates of the serac fields. It was on 24 July 1842 that Scottish physicist James David Forbes observed the pattern of light and dark dirt bands on the Mer de Glace from the nearby Charmoz and began to consider whether glaciers flowed in a similar fashion to a sluggish river and with a viscous or plastic manner. [5]

John Tyndall explored the glacial tributaries feeding Mer de Glace in 1857 Mer de Glace sketchmap by John Tyndall, 1857, from 1896 edition.png
John Tyndall explored the glacial tributaries feeding Mer de Glace in 1857

In the 18th and 19th centuries the glacier descended all the way down to the hamlet of Les Bois, [4] where it was known as Glacier des Bois. At that time the river Arveyron emerged from the glacier under a grotto-like vault (grotte d'Arveyron) [6] and, through the accounts of early writers and explorers, [7] attracted many more visitors, painters and later photographers, for example Joseph Mallord William Turner's "Source of the Arveron in the Valley of Chamouni Savoy", 1816. The position of its front end fluctuated over the years but its maximum extent was in the mid-19th century. [4]

See also

Notes

  1. La Mer de Glace - Chamonix Mont Blanc
  2. 1 2 3 4 5 Nussbaumer, S.U.; Zumbuhl, H.J.; Steiner, D. (2007). "Fluctuations of the "Mer de Glace" (Mont Blanc area, France) AD 1500–2050" (PDF). Zeitschrift für Gletscherkunde und Glazialgeologie. Innsbruck. BAND 40 (2005/2006): 1–137. ISSN   0044-2836 . Retrieved 13 January 2016.
  3. Nye, J.F. (1952). "The Mechanics of Glacier Flow" (PDF). Journal of Glaciology. 2 (12): 82. Bibcode:1952JGlac...2...82N. doi:10.1017/S0022143000033967 . Retrieved 13 January 2016.
  4. 1 2 3 (Grove pages 121-122, "in 1820 ... sixty yards")
  5. Shairp, John Campbell; Tait, Peter Guthrie; Adams-Reilly, Anthony (1873). Life and Letters of James David Forbes, F.R.S., D.C.L., LL. D etc. London: Macmillan and Co. p.  527 . Retrieved 13 January 2016. 24 july 1842 glacier mer de glace.
  6. Tyndall page 38, "In former times the whole volume of the Arveiron escaped from beneath the ice at the end of the glacier, forming a fine arch at its place of issue."
  7. William Coxe (1777). Pinkerton, John (ed.). Travels in Switzerland and in the Country of the Grisons 1777 (in 'A General Collection of the Best and Most Interesting Voyages', Vol.5 1809). p. 781. Retrieved 14 February 2016.

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References