Synopsis: The Geometry of Arctic Ponds

A geometric model of meltwater ponds may help predict how the polar ice caps might evolve under future climate changes.
Synopsis figure
NASA IceBridge

Climate change has dramatically altered the Arctic, with sea ice melting faster than large-scale models predicted. Part of the reason for this underestimation is the lack of a full understanding of the ponds that develop from the melting ice. A new geometric model of Arctic ponds can reproduce observed distributions of pond size and shape. Because of its simplicity, the model may prove to be practical in predicting how further warming could affect polar ice caps.

When Arctic sea ice melts, meltwater ponds of various shapes and sizes form on the ice surface. The ponds have a dramatic impact on energy transport, as water is less reflective and more absorbing of solar flux than either ice or snow. This property leads to a positive feedback mechanism: the more ponds form, the more sunlight is absorbed, and the more melting occurs. Researchers are currently trying to formulate pond models that might allow them to incorporate these small-scale feedback effects into large-scale climate models.

Predrag Popović from the University of Chicago and his colleagues have devised a simple pond model that is based on drawing circles randomly on a plane and assuming that melt ponds form in the voids between the circles. The model has just two input parameters: the mean circle radius and the fraction of surface area covered by voids. The team tuned these parameters so that the voids exhibit the same spatial correlations as those observed in melt ponds. Using this parameterization, they showed that the model accurately reproduces other pond features, such as the fractal characterization of their shapes and the pond abundance as a function of area.

This research is published in Physical Review Letters.

–Michael Schirber

Michael Schirber is a Corresponding Editor for Physics based in Lyon, France.


More Features »


More Announcements »

Subject Areas

GeophysicsInterdisciplinary Physics

Previous Synopsis

Particles and Fields

Splitting the Jets

Read More »

Related Articles

Viewpoint: Yes, Sexual Harassment Still Drives Women Out of Physics
Interdisciplinary Physics

Viewpoint: Yes, Sexual Harassment Still Drives Women Out of Physics

A survey of female undergraduates in physics found that three quarters of them experience some form of sexual harassment, leaving them alienated from the field. Read More »

Synopsis: Noise-Induced Transitions in Earth’s Climate

Synopsis: Noise-Induced Transitions in Earth’s Climate

Calculations show that small fluctuations in solar radiation could cause a transition between a warm Earth and an icy Earth. Read More »

Focus: Seismic Waves Feel the Moon’s Tug

Focus: Seismic Waves Feel the Moon’s Tug

Seismic measurements reveal the influences of lunar gravitational forces and solar heat on the properties of rocks. Read More »

More Articles