Surface Melt-Induced Acceleration of Greenland Ice-Sheet Flow

@article{Zwally2002SurfaceMA,
  title={Surface Melt-Induced Acceleration of Greenland Ice-Sheet Flow},
  author={H. Jay Zwally and Waleed Abdalati and Thomas Herring and Kristine M. Larson and Jack L. Saba and Konrad Steffen},
  journal={Science},
  year={2002},
  volume={297},
  pages={218 - 222}
}
Ice flow at a location in the equilibrium zone of the west-central Greenland Ice Sheet accelerates above the midwinter average rate during periods of summer melting. The near coincidence of the ice acceleration with the duration of surface melting, followed by deceleration after the melting ceases, indicates that glacial sliding is enhanced by rapid migration of surface meltwater to the ice-bedrock interface. Interannual variations in the ice acceleration are correlated with variations in the… 

Large and Rapid Melt-Induced Velocity Changes in the Ablation Zone of the Greenland Ice Sheet

TLDR
Continuous Global Positioning System observations reveal rapid and large ice velocity fluctuations in the western ablation zone of the Greenland Ice Sheet, which suggests that the englacial hydraulic system adjusts constantly to the variable meltwater input, which results in a more or less constant ice flux over the years.

Decay of the Greenland Ice Sheet due to surface-meltwater-induced acceleration of basal sliding

Simulations of the Greenland Ice Sheet are carried out with a high-resolution version of the ice-sheet model SICOPOLIS for several global-warming scenarios for the period 1990-2350. In particular,

Self-regulation of ice flow varies across the ablation area in south-west Greenland

Abstract. The concept of a positive feedback between ice flow and enhanced melt rates in a warmer climate fuelled the debate regarding the temporal and spatial controls on seasonal ice acceleration.

Fracture Propagation to the Base of the Greenland Ice Sheet During Supraglacial Lake Drainage

TLDR
The rapid (<2 hours) drainage of a large supraglacial lake down 980 meters through to the bed of the Greenland Ice Sheet initiated by water-driven fracture propagation evolving into moulin flow coincided with increased seismicity, transient acceleration, ice-sheet uplift, and horizontal displacement.

Amplified melt and flow of the Greenland ice sheet driven by late-summer cyclonic rainfall

Intense rainfall events significantly affect Alpine and Alaskan glaciers through enhanced melting, ice-flow acceleration and subglacial sediment erosion, yet their impact on the Greenland ice sheet

Winter motion mediates dynamic response of the Greenland Ice Sheet to warmer summers

We present ice velocities from a land‐terminating transect extending >115 km into the western Greenland Ice Sheet during three contrasting melt years (2009–2011) to determine whether enhanced melting

Greenland ice sheet motion coupled with daily melting in late summer

We use ground‐based and satellite observations to detect large diurnal and longer‐period variations in the flow of the Greenland Ice Sheet (GrIS) during late summer that are strongly coupled with

Decadal slowdown of a land-terminating sector of the Greenland Ice Sheet despite warming

TLDR
It is shown that annual ice motion across an 8,000-km2 land-terminating region of the west GIS margin, extending to 1,100 m above sea level, was 12% slower in 2007–14 compared with 1985–94, despite a 50% increase in surface meltwater production.

Dynamic response of the Greenland ice sheet to recent cooling

TLDR
It is hypothesized that under thinner ice, increases in basal water pressure offset a larger proportion of the ice overburden pressure, leading to reduced effective pressure and thus greater acceleration when compared to thicker ice further inland, and is strongly correlated with ice thickness.
...

References

SHOWING 1-10 OF 91 REFERENCES

Response of the East Antarctica ice sheet to sea-level rise

A nonsteady ice-flow model that explicitly includes longitudinal stresses is used to study the effects of marginal changes on the interior portions of an ice sheet. Sea-level rise is found to cause a

Ice Core Evidence for Extensive Melting of the Greenland Ice Sheet in the Last Interglacial

  • R. Koerner
  • Environmental Science, Geography
    Science
  • 1989
Evidence from ice at the bottom of ice cores from the Canadian Arctic Islands and Camp Century and Dye-3 in Greenland suggests that the Greenland ice sheet melted extensively or completely during the

Sensitivity of a Greenland ice sheet model to ice flow and ablation parameters: consequences for the evolution through the last climatic cycle

Abstract. Sensitivity experiments are conducted to test the influence of poorly known model parameters on the simulation of the Greenland ice sheet by means of a three dimensional numerical model

Was the Greenland ice sheet thinner in the late Wisconsinan than now?

  • N. Reeh
  • Environmental Science
    Nature
  • 1985
Ice of Wisconsinan origin which constitutes the basal layers of the ice caps in arctic Canada and Greenland flows three to four times more readily than the Holocene ice above. A model based on simple

Increased Ablation at the Margin of the Greenland Ice Sheet under a Greenhouse-Effect Climate

Increased ablation under a greenhouse-effect climate is calculated by an energy-balance model for two sites at the margin of the Greenland ice sheet: Nordbogletscher, south Greenland, and Qamanârssûp

The Dynamic Response of the Greenland and Antarctic Ice Sheets to Multiple-Century Climatic Warming

New calculations were performed to investigate the combined response of the Greenland and Antarctic ice sheets to a range of climatic warming scenarios over the next millennium. Use was made of fully

Geometry and Dynamics of a Surge-type Glacier

Abstract Measurement of geometry, motion, and mass balance from Variegated Glacier, Alaska portray conditions in this surge-type glacier close to the mid-point of its 20 year surge cycle. Comparison

Greenland Ice Sheet melt extent: 1979–1999

Analysis of melt extent on the Greenland ice sheet is updated to span the time period 1979-1999 and examined along with its spatial and temporal variability using passive microwave satellite data. To

Surface climatology of the Greenland Ice Sheet: Greenland Climate Network 1995–1999

The Greenland climate network has currently 18 automatic weather stations (AWS) distributed in most climate regions of the ice sheet. The present network captures well the regional climates and their

Balance mass flux and ice velocity across the equilibrium line in drainage systems of Greenland

Estimates of balance mass flux and depth-averaged ice velocity through the cross section aligned with the equilibrium line are produced for each of six drainage systems in Greenland. The estimates
...