Water frost while the stability regarding northern and you may northeast Greenland floating glaciers

The new communication anywhere between water ice and you may glaciers could have been learnt to have the brand new drifting tongue out of Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). Recommendations of glacial geological studies, journey account, aerial images and you can satellite images is employed in order to file the fresh new glacier front side status and you will fast-ice conditions towards the millennial so you can decadal time-balances. The research mean that the stability of your own drifting glacier margin is dependent on the current presence of a preserving fast-frost safety in front of the glacier. In the symptoms with a permanent prompt-freeze safety, no calving happens, however, immediately following fast-ice break-within the glacier reacts that have a huge calving craft, which numerous years of obtained glacier-ice flux unexpectedly holidays away. Climate-triggered alter away from sea-frost criteria about Cold Ocean with regular split-right up of the close-coastline timely freeze could lead to disintegration of drifting glaciers. The present principal bulk losses because of the bottom melting manage after that to help you a giant the total amount be taken over because of the grounding-line calving out-of icebergs. Neighborhood influx out-of water regarding northern Greenland glaciers on the sea will be smaller plus the regional iceberg creation manage increase.

Introduction

Submarine and you can satellite-established findings inform you a life threatening reduction of extent and density of the latest Arctic ocean-ice coverage over the past 20?three decades ( Site Johannessen, Shalina and you can Miles Johannessen, 1999). In the event the went on, this might produce a significantly different frost-ocean-conditions techniques on the Arctic, of the switching heat and bulk exchanges plus water stratification. This may dictate the new glaciation of one’s property areas facing the latest Cold seas on account of change of snowfall buildup and you may/otherwise surface melting. But not, changes of one’s close-shore water-frost standards have a deeper impact on the new belongings-situated glaciations. Punctual freeze was at introduce popular along side rim of your Arctic Ocean. In the major environment off north and you will northeast Greenland, fast freeze will get build-up to a significant occurrence and you may block entrance out of fjords to have s Wadhams, 1981), impacting the newest mass equilibrium of one’s glaciers in the region. At this time, of several retailer glaciers in the north and you will northeast Greenland circles away from the brand new Greenland ice-sheet (inland frost) is actually characterized by lengthened floating sections. The newest partial-long lasting ocean-ice security generally seems to manage the latest floating glacier tongues and you can suppresses her or him off disintegrating. The big size losings in the glaciers is through extreme bottom melting averaging multiple yards out-of ice a-year ( Reference Rignot, Gogineni, Krabill and Ekholm Rignot although some, 1997; Reference Thomsen Thomsen although some, 1997; Site Reeh, Mayer, Miller, Thomsen and Weidick Reeh while some, 1999a). Brand new resulting new-water supply into the ocean probably takes on a crucial role from inside the keeping the new partial-permanent punctual-freeze protection ahead of the glaciers ( Resource Mayer, Reeh, Jung-Rothenhausler, Huybrechts and Oerter ).

At present, the loss by the calving in the form of break-right up of front the main glaciers inside the kilometre-sized tabular freeze islands certain 10s off metres heavy comprises only a small fraction of the total bulk loss. The latest ice islands drift from the glacier fronts only if the local sea freeze vacation trips right up, an unusual feel and this not as much as present weather occurs at intervals as high as numerous age ( Site Higgins Higgins 1989, Source Higgins 1991).

Nioghalvfjerdsfjorden Glacier

Telecommunications anywhere between glaciers and you may sea frost has been read during the Nioghalvfjerdsfjorden glacier, northeast Greenland (79°30’N, 22° W). The fresh glacier is approximately 80 kilometres a lot of time and you can 21 kilometer broad halfway down the length, broadening in order to regarding 29 kilometer from the head freeze front side. A northern branch of your own glacier, 8 kilometres wider, drains to your fjord Dijmphna Sund to the west of Hovgaard 0 (Fig. 1). The latest outer ? 6 0 km of the glacier www.datingranking.net/cs/guyspy-recenze try afloat, having a great grounding area nearby the Greenland ice sheet near the fresh new west department of your freeze-dammed river Blaso (Fig. 1).

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Prirodnjak. Osobenjak. Zanesenjak.