FN Archimer Export Format
PT J
TI Rifting processes and ice-flow modulation observed on Mertz Glacier, East Antarctica
BT 
AF LESCARMONTIER, L.
   LEGRESY, B.
   YOUNG, N. W.
   COLEMAN, R.
   TESTUT, L.
   MAYET, C.
   LACROIX, P
AS 1:1,2;2:2,3,4;3:3,5;4:3,6;5:2;6:2;7:7;
FF 1:;2:;3:;4:;5:;6:;7:;
C1 Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia.
   LECOS CNRS CNES UPS IRD, Toulouse, France.
   Univ Tasmania, Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas, Australia.
   CSIRO, Oceans & Atmosphere Flagship, Hobart, Tas, Australia.
   Australian Antarctic Div, Kingston, Tas, Australia.
   Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas, Australia.
   Univ Grenoble, CNRS IRD, Inst Sci Terre ISTerre, Grenoble, France.
C2 UNIV AUSTRALIAN NATL, AUSTRALIA
   OBSERV MIDI PYRENEES, FRANCE
   UNIV TASMANIA, AUSTRALIA
   CSIRO, AUSTRALIA
   AUSTRALIAN ANTARCTIC DIV, AUSTRALIA
   UNIV TASMANIA, AUSTRALIA
   UNIV GRENOBLE, FRANCE
IF 3.109
TC 6
UR https://archimer.ifremer.fr/doc/00489/60023/63276.pdf
LA English
DT Article
CR NIVMER
DE ;Antarctic glaciology;calving;crevasses;glacier flow;glacier mechanics
AB We investigated the evolution of two major rifts cutting across Mertz Glacier Tongue, East Antarctica, using a combination of satellite images and 60 day sets of GPS data from two stations deployed either side of the western rift in 2007. The eastern rift began to open in the early 1990s, and the western rift initiated in 2002 in conjunction with the collision of a large iceberg with the tongue. Velocity time series derived from the 2007 GPS data exhibited strong variations at tidal periods modulated by sea-surface height and sea-surface slope and reproduced here with a conceptually simple model. We found that opening of the western rift in 2002 leads to a dramatic change in behavior of the tongue as the large range in velocity (700-2400 m a(-1)) observed in 2000 was largely reduced (1075-1225 m a(-1)) in 2007. Opening of the western rift decoupled the glacier from the transverse loading on the tongue driven by east-west tidal circulation. This loading previously induced time-varying lateral drag, which caused the large velocity range. Our results suggest changes in the mechanical behavior of an ice tongue impact the dynamics of the outlet glacier system and should be considered in longer-term mass-balance evaluations. 
PY 2015
SO Journal Of Glaciology
SN 0022-1430
PU Int Glaciol Soc
VL 61
IS 230
UT 000371653600014
BP 1183
EP 1193
DI 10.3189/2015JoG15J028
ID 60023
ER

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