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|a Is the West Antarctic Ice Sheet Disintegrating? |h [electronic resource] |y English. |
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|a [S.l.] : |b American Geophysical Union, |c 1973. |
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|a Journal of Geophysical Research Volume 78 Number 33 |y English. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Data pertaining to the dynamics and history of the west antarctic ice cover are reviewed
and interpreted in terms of a possible inherent instability of the ice cover. A study of published
dat• concerning the past and present ice cover of West Antarctica indicates that during
the last few million years the ice sheet has been retreating in stages, each retreat stage being
preceded by an advance of comparable duration. Thus disintegration of the west antarctic ice
sheet seemst o follow the disintegrationp attern of other continentali ce sheetsa nd may be
the last phase of the wo.rldwide Late Cenozoic ice age. At least some of the retreat stages
seem to have been rapid enough to be called surges. Stages of advance seem to have temporarily
introduced equilibrium conditions, since equilibrium ice sheet surface profiles can be
reconstructedfr om the moraines,e tc., and thus mark the stable limits of each advance.
Present ice sheet surface profiles along flowlines entering both the Ronne and the Ross ice
shelvesf rom Marie Byrd Land are not equilibrium profiles,s uggestingth at the west antarctic
ice sheet is unstable. An analysis of the grounded portion of the west antarctic ice cover
indicates that data relating to the surface profile, ice velocity, and the mass balance are all
incompatible with an equilibrium ice sheet. Instability seems to be centered in the major ice
streams that drain Marie Byrd Land. An analysis of the floating portion of the west antarctic
ice cover indicates that basal melting is most pronounced along the Siple Coast of the Ross
ice shelf and causes retreat of the grounding line into Marie Byrd Land. Instability seems to
be related to sudden retreats of the grounding line. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15062132/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/21/32/00001/FI15062132thm.jpg |
