McCarty Glacier

Autor/Urheber:

1. July 7th, 1909 by Ulysses Sherman Grant, USGS photo library, public domain 2
2. August 11, 2004 by Bruce F. Molnia, USGS, public domain 3

Shortlink:

https://www.dewiki.de/b/8af3f

Quelle:

Wikimedia Commons

Größe:

996 x 704 Pixel (115222 Bytes)

Beschreibung:

Comparison photos of McCarty Glacier in Kenai Fjords National Park, Alaska. McCarty glacier retreated ~20 km between the period these two photos were taken and is not visible in the 2004 photo. Prior to this, McCarty achieved its maximum known extent circa 1850 approximately 0.5 km from its position in 1909 and was relatively stable at that time 1. Most of the observed retreat occurred before 1964, and this glacier is even known to have advanced some (at least 0.6 km) during somewhat colder conditions in the 1970s, before retreating 0.4 km between 1984 and 2002 (Hall et al. 2005). As McCarty Glacier is a tidewater glacier, i.e. a glacier which terminates in ocean water but is sufficiently thick to keep from floating, its behavior can respond somewhat erratically to climate change. Glaciers of this type are often some of the fastest in retreat because glacier thinning can cause partial flotation and the infiltration of sea water under the glacier that aids in the calving of icebergs and further retreat. As a result the rate of retreat, once triggered by climate perturbations, may more strongly correlate to channel depth than to the actual changes in temperature or precipitation (Vieli et al. 2002).

Kommentar zur Lizenz:

siehe "Global Warming Art License"

Lizenz:

Public domain

Credit:

http://globalwarmingart.com/wiki/Image:McCarty_Glacier_jpg

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