Simulation of Larsen B ice shelf retreat as
response to Larsen A collapse
The "eigencalving law" reveals far-reaching
interactions between neighboring ice shelves that are mechanically
connected. The simulation with PISM-PIK shows that the calving front
position of Larsen B Ice Shelf retreats immediately after the disintegration
of Larsen A ice shelf. A changing boundary affects the overall stress
balance and the strain-rate field and hence the estimated calving
rates at the ice shelf front. This mechanism provides an explanation
for the gradual retreat of Larsen B Ice Shelf prior to its observed
collapse in 2002. Greenish colors indicate ice speed anomaly (meter
per year) with respect to the initial state of intact Larsen Ice
Shelf system. Oberved front poistions of the years 1993, 1995 and
2000 are delineated in yellow, red and green respectively.Related
& Levermann (2014) .
Simulation of ice shelf in Antarctica
The extent of the floating ice shelves around Antarctica is mainly
determined by the ice flow off the continent and the calving of
ice bergs into the ocean. In these simulations with PISM-PIK we
apply the "eigencalving law" saying that ice loss is proportional
to the two-dimensional spreading of the ice. This formula is consistent
with the observed stages of the ice fronts of Larsen A and B, as
seen in the animation. (Light grey: land, dark grey: ocean, colours:
ice shelf.). Related publication: A.
Levermann et al. (2012).
Ice flow in the PISM-PIK Antarctic Ice Sheet
Visualisation of ice flow in the Antarctic ice sheet model PISM-PIK.
The white dots show how particles move with the ice which are initially
randomly distributed over the ice surface. Colours in addition show
the flow speed. Related publications: Winkelmann
et al. (2010), Martin
et al. (2010).
simulated with a climate - ice sheet model
A view of the continental ice sheet changes
over the past 400,000 years, simulated with PIK's CLIMBER-2 model.
The model is driven by orbital parameters and CO2 variations from
Antarctic ice core data. The time in years before present is shown
in the lower right corner. The changes in continental ice cover
cause sea level changes with an amplitude of ~ 120 meters. Related
et al. 2010.
simulated with an ice sheet model
A view of the Laurentide ice sheet over North
America with steady climate forcing. The ice sheet builds up by
snowfall but episodically loses ice by sliding, an internal dynamic
instability. This mechanism may explain the so-called Heinrich events,
which are episodic, massive ice discharges during glacial times.
They are associated with up to 10 meters of sea-level rise and documented
in deep-sea sediments across the Atlantic. Related publication:
et al. 2010.