2023年3月24日 · As the NSF states, ice cores show lower carbon dioxide amounts over the past 400,000 years, but ice cores reach back even further in time. According to the NSF-ICF, cores extracted from the Greenland Ice Sheet preserve 130,000 years of climate history.

An ice core is a core sample that is typically removed from an ice sheet or a high mountain glacier. Since the ice forms from the incremental buildup of annual layers of snow, lower layers are older than upper ones, and an ice core contains ice formed over a range of years.

2025年1月14日 · A colossal ice core sample drilled in Antarctica may contain the oldest, unbroken timeline of Earth's climate, stretching back more than a million years.

2014年5月1日 · Scientists run melted samples through various instruments—mass spectrometers, scanning electron microscopes, gas chromatographs—to find tiny pieces of pollution, like sulfates, traces of metals, or radioactive fallout, or natural aerosols like dust or volcanic ash. An ice core rests in a melter designed by Erich Osterberg's team.

2017年8月14日 · The samples they collect from the ice, called ice cores, hold a record of what our planet was like hundreds of thousands of years ago. But where do ice cores come from, and what do they tell us about climate change?

2025年1月13日 · Record 2-Mile-Long Ice Core Represents 1.2 Million Years of Earth’s Climate History Analyzing gas trapped within different layers of the ice can tell us about Earth’s climate in the past — and give us clues to what might lie ahead.

2021年12月20日 · Search through ice core studies using Investigator, Title, Location Name, Parameters, and Latitude/Longitude Bounds. Launch Ice Core Data Search. Access a free text search of our entire archive. Launch Paleo Data Search. Select study locations by region, proximity to a point, or text-based attributes. Launch Interactive Map.

2025年1月12日 · The sample extended so deep that scientists reached the bedrock beneath it. The ice core spans at least 1.2 million years of Earth’s climate history.

Ice cores are cylinders of ice drilled from ice sheets and glaciers. They are essentially frozen time capsules that allow scientists to reconstruct climate far into the past. Layers in ice cores correspond to years and seasons, with the youngest ice at …

2025年1月16日 · An international team of scientists recently recovered a 1.7-mile-long ice core with ice samples dating back 1.2 million years (and possibly) later—400,000 years older than previous samples ...