14 Ağu Sea freeze and also the stability from northern and northeast Greenland floating glaciers
The new correspondence anywhere between ocean freeze and you will glaciers might have been learned to own new drifting language off Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). Information regarding glacial geological degree, journey profile, aerial pictures and satellite images is used so you’re able to document the fresh new glacier side position and you will quick-frost standards to the millennial to help you decadal time-bills. The research signify the soundness of your own floating glacier margin is based on the presence of a saving prompt-ice defense prior to the glacier. When you look at the periods which have a long-term quick-frost cover, no calving happen, but just after punctual-frost split-within the glacier reacts which have a large calving interest, where years of accumulated glacier-frost flux unexpectedly breaks away. Climate-triggered transform out-of water-ice criteria on the Arctic Ocean with regular break-up of your close-coast quick ice can lead to disintegration of your drifting glaciers. The present dominant bulk loss of the cheekylovers seznamovacÃ web bottom melting perform up coming in order to an enormous the quantity be studied more than by the grounding-line calving away from icebergs. Your local increase from fresh-water regarding north Greenland glaciers to your sea would be shorter and local iceberg manufacturing would boost.
Submarine and you may satellite-depending findings inform you a significant reduction of extent and you may occurrence out of the latest Arctic sea-frost coverage over the past 20?three decades ( Source Johannessen, Shalina and you will Kilometers Johannessen, 1999). If the went on, this might bring about a significantly more ice-ocean-conditions techniques regarding the Arctic, of the altering heat and size transfers including ocean stratification. This may dictate the latest glaciation of house parts facing the fresh Snowy waters due to alter out-of snowfall buildup and you may/or body melting. But not, transform of the near-shore water-freeze requirements have a much deeper effect on the newest residential property-situated glaciations. Punctual ice is at expose well-known across the rim of the Cold Sea. Regarding really serious weather away from north and northeast Greenland, quick frost will get develop to a sizeable density and you may stop entrance off fjords to possess s Wadhams, 1981), affecting the fresh size balance of glaciers in the area. At present, many outlet glaciers about northern and northeast Greenland sectors out-of this new Greenland ice sheet (inland ice) was characterized by expanded floating areas. The fresh new semi-permanent water-freeze safety appears to protect the fresh drifting glacier tongues and suppresses her or him out of disintegrating. The top size loss regarding glaciers is via intense base melting averaging multiple yards away from freeze annually ( Site Rignot, Gogineni, Krabill and Ekholm Rignot and others, 1997; Reference Thomsen Thomsen while others, 1997; Resource Reeh, Mayer, Miller, Thomsen and you can Weidick Reeh although some, 1999a). Brand new ensuing new-water supply towards ocean probably takes on a crucial role in keeping the new semi-long lasting fast-frost protection in front of the glaciers ( Source Mayer, Reeh, Jung-Rothenhausler, Huybrechts and you will Oerter ).
At this time, the loss because of the calving in the form of crack-up of front area of the glaciers in the kilometre-measurements of tabular ice isles some tens out-of metres thicker constitutes merely half the full size losses. The fresh freeze isles float from the glacier fronts as long as the local sea frost breaks right up, an unusual knowledge and that significantly less than present weather occurs in the menstruation as much as multiple many years ( Site Higgins Higgins 1989, Reference Higgins 1991).
Correspondence anywhere between glaciers and you will sea freeze might have been examined during the Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). The new glacier is approximately 80 kilometres enough time and 21 kilometer greater halfway off their length, expanding to regarding the 31 kilometres within chief frost front side. A northern branch of your glacier, 8 km broad, drainage with the fjord Dijmphna Sund to the west of Hovgaard 0 (Fig. 1). Brand new outside ? six 0 km of the glacier is actually afloat, which have good grounding region around the Greenland ice sheet close the fresh new western part of your own frost-dammed lake Blaso (Fig. 1).