blue ice

noun

Geology.

1. the oldest and densest ice in a glacier, distinguished by a pale-blue color.

Example Sentences

Brook thought so-called “blue ice” might offer a chance to go back further in time.

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If continuous ice cores are like books, blue ice cores are untitled chapters presented out of order, with lines missing.

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But not one blue ice sample older than 1 million years exceeded 300 ppm, says Julia Marks Peterson, a paleoclimatologist at OSU who performed the greenhouse gas analysis.

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But the snapshots across the transition found in the blue ice suggest CO2 levels held steady between about 220 ppm and 250 ppm.

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That means the warmer Pliocene climate—and its clues to our warming future—will be the sole preserve of blue ice deposits.

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