The latest communications anywhere between sea frost and you can glaciers has been learned getting the brand new drifting language out-of Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). Advice of glacial geological degree, expedition accounts, aerial pictures and you can satellite images can be used to document the fresh glacier top updates and you can quick-frost criteria on millennial so you’re able to decadal go out-scales. The research signify the soundness of your drifting glacier margin is based on the presence of a preserving timely-frost safety in front of the glacier. When you look at the episodes which have a permanent fast-frost security, zero calving happen, but once prompt-freeze crack-in the glacier reacts with a huge calving craft, wherein many years of accumulated glacier-ice flux unexpectedly getaways aside. Climate-induced change out-of ocean-freeze requirements on Snowy Water having regular crack-upwards of the near-coastline timely ice could lead to disintegration of your own floating glaciers. The current dominating size loss by bottom melting would after that in order to a large the total amount be used more than from the grounding-line calving out-of icebergs. Nearby influx out of water from the northern Greenland glaciers into sea could be quicker plus the local iceberg development perform raise.
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Introduction
Submarine and satellite-depending observations reveal a serious decrease in the total amount and you can occurrence away from the brand new Arctic sea-frost cover over the last 20?thirty years ( Site Johannessen, Shalina and you can Kilometers Johannessen, 1999). If the went on, this might lead to a significantly some other frost-ocean-atmosphere techniques on the Snowy, from the altering heat and mass transfers together with water stratification. This could determine brand new glaciation of your own residential property parts against the new Cold seas due to alter out of snow buildup and you may/otherwise surface melting. not, change of your own close-coastline ocean-ice criteria could have a deeper effect on the fresh residential property-built glaciations. Prompt ice is at expose popular over the rim of one’s Snowy Water. Regarding the major environment of north and you can northeast Greenland, fast frost will get build so you’re able to a significant thickness and you can take off entrance regarding fjords getting s Wadhams, 1981), influencing the latest bulk equilibrium of your glaciers in your community. At present, of numerous outlet glaciers regarding the northern and you will northeast Greenland sectors out of the Greenland ice sheet (inland frost) is actually described as longer drifting parts. The new semi-permanent water-frost security appears to manage the brand new drifting glacier tongues and you will prevents her or him off disintegrating. The big size loss throughout the glaciers is by extreme bottom melting averaging multiple yards out-of freeze a-year ( Site Rignot, Gogineni, Krabill and you can Ekholm Rignot and others, 1997; Resource Thomsen Thomsen while others, 1997; Reference Reeh, Mayer, Miller, Thomsen and Weidick Reeh and others, 1999a). The fresh new resulting fresh-water supply into water most likely plays an important role in keeping the newest partial-permanent quick-freeze defense ahead of the glaciers ( Source Mayer, Reeh, Jung-Rothenhausler, Huybrechts and you may Oerter ).
At present, losing by calving in the way of break-up of the frontal part of the glaciers when you look at the kilometre-sized tabular frost isles specific tens off metres dense constitutes just half the size loss. New frost islands float off the glacier fronts only when nearby ocean freeze holiday breaks up, an uncommon experiences and that below establish weather conditions takes place in the intervals as much as multiple decades ( Resource Higgins Higgins 1989, Resource Higgins 1991).
Nioghalvfjerdsfjorden Glacier
Interaction anywhere between glaciers and you may water ice has been learnt at the Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). New glacier concerns 80 km a lot of time and you can 21 kilometer greater midway down their duration, broadening to help you on the 29 km at fundamental freeze top. A north branch of jak poslat zprávu nÄ›komu na caffmos your own glacier, 8 kilometres wide, drains into the fjord Dijmphna Sund west of Hovgaard 0 (Fig. 1). Brand new outer ? six 0 kilometer of one’s glacier try afloat, having good grounding region nearby the Greenland ice-sheet near the fresh new western department of the frost-dammed lake Blaso (Fig. 1).
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