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Alison Criscitiello carrying an ice core.

Alison Criscitiello carrying an ice core.
Alison Criscitiello carrying an ice core.
Alison Criscitiello carrying an ice core.
Alison Criscitiello carrying an ice core.
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Das, Sarah
Alison Criscitiello carrying an ice core.
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12/23/2010
DSC_1273NewZealand2010December 23, 2010.JPG
Caption from Oceanus magazine, vol. 49, no. 2, page 14:
Alison Criscitiello removes the inner barrel of a drill containing an ice core from the West Antarctic Ice Sheet. Snow falls atop the ice sheet in annual layers, so the deeper you drill, the further back in time you go. The graduate student is analyzing a chemical compound in the ice to reconstruct how sea ice has changed over hundreds of years in the Pine Island Bay region.
Image of The Day caption:
Alison Criscitiello removes the inner barrel of drill containing an ice core from the West Antarctic Ice Sheet. Snow accumulates on the ice sheet in layers, so drilling deeper reveals older ice crystals. The MIT-WHOI Joint Program graduate student measure the concentration of a chemical compound in the ice called methanesulfuric acid, or MSA, in samples taken from the cores. MSA is created by phytoplankton that bloom offshore when sea ice melts, exposing the ocean to sunlight. More MSA in ice core layers equals more phytoplankton equals less sea ice. Criscitiello wants to reconstruct how sea ice coverage has changed over past hundreds of years.
Photo by Sarah Das
© Woods Hole Oceanographic Institution
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