; Sea ice therefore the stability off northern and you may northeast Greenland drifting glaciers | Çatalköy Belediyesi

Sea ice therefore the stability off northern and you may northeast Greenland drifting glaciers



Sea ice therefore the stability off northern and you may northeast Greenland drifting glaciers

The latest telecommunications between ocean frost and you will glaciers might have been learned having the fresh new floating language of Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). Suggestions off glacial geological studies, expedition accounts, aerial pictures and satellite photographs is used so you can document this new glacier top position and you can timely-frost requirements towards the millennial to decadal big date-balances. The research imply that the stability of your drifting glacier margin is dependant on the clear presence of a preserving fast-ice cover prior to the glacier. Within the episodes having a permanent fast-frost safeguards, no calving happens eurodate zaregistrovat, but immediately following fast-freeze crack-in the glacier responds with a giant calving activity, whereby numerous years of accumulated glacier-ice flux quickly getaways aside. Climate-caused transform regarding water-freeze conditions on Cold Ocean that have seasonal break-right up of your own near-coastline timely frost can lead to disintegration of your drifting glaciers. Today’s principal size loss from the bottom melting manage then so you’re able to a big the quantity be used more than by grounding-range calving of icebergs. Your regional influx out of fresh-water throughout the north Greenland glaciers to your sea would be less therefore the local iceberg manufacturing create improve.

Inclusion

Submarine and you may satellite-centered findings reveal a life threatening reduced total of the amount and you may density from the brand new Arctic water-ice safety over the past 20?3 decades ( Resource Johannessen, Shalina and you will Miles Johannessen, 1999). In the event the went on, this may end in a significantly additional ice-ocean-environment program throughout the Cold, from the modifying temperature and you will mass transfers along with sea stratification. This could influence the fresh new glaciation of the homes areas facing this new Snowy seas due to changes regarding snow accumulation and/or body melting. not, change of your own close-shore water-freeze conditions have a further affect the fresh home-based glaciations. Fast ice is at introduce prominent along side rim of one’s Arctic Ocean. On significant weather from north and northeast Greenland, fast frost will get build up in order to a sizeable density and stop entrance off fjords to have s Wadhams, 1981), influencing the newest size balance of glaciers in the area. At this time, of numerous retailer glaciers regarding the northern and northeast Greenland groups out of the brand new Greenland ice sheet (inland frost) are described as longer drifting sections. The brand new partial-long lasting ocean-freeze protection appears to manage the fresh floating glacier tongues and you will prevents her or him off disintegrating. The big size losings about glaciers is via extreme base melting averaging multiple yards away from freeze per year ( Source Rignot, Gogineni, Krabill and you can Ekholm Rignot although some, 1997; Site Thomsen Thomsen while some, 1997; Source Reeh, Mayer, Miller, Thomsen and you may Weidick Reeh and others, 1999a). The new resulting fresh-water-supply into the sea probably plays an important role inside maintaining the partial-permanent punctual-frost security prior to the glaciers ( Source Mayer, Reeh, Jung-Rothenhausler, Huybrechts and you can Oerter ).

Currently, the loss by calving in the way of break-up of your frontal the main glaciers in kilometre-sized tabular freeze islands specific 10s from yards thicker comprises just a part of the complete size losings. New ice isles float from the glacier fronts only when your neighborhood sea ice breaks upwards, an unusual enjoy and that less than present climate conditions happen within menstruation all the way to multiple age ( Source Higgins Higgins 1989, Source Higgins 1991).

Nioghalvfjerdsfjorden Glacier

Interaction between glaciers and you will ocean ice might have been analyzed in the Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). The new glacier concerns 80 kilometres much time and you may 21 kilometres greater midway off their duration, widening in order to regarding 29 kilometres in the head ice front. A north part of your own glacier, 8 km wide, empties on fjord Dijmphna Sund to the west of Hovgaard 0 (Fig. 1). Brand new external ? 6 0 km of your glacier are afloat, with a grounding part near the Greenland ice-sheet near brand new west department of your own freeze-dammed lake Blaso (Fig. 1).


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