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Ice Core

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Ancient ice records reveal stable greenhouse gas levels over 3 million years
science24 days ago

Ancient ice records reveal stable greenhouse gas levels over 3 million years

New shallow Allan Hills blue-ice cores extend greenhouse-gas records to about 3.1–0.5 million years ago. They show mean CH4 changing little over the period, with CO2 falling by ~20 ppm from 2.9 to 1.2 Ma and then staying stable within ±10 ppm through the mid‑Pleistocene Transition; respiration-corrected samples from 2.8–3.1 Ma yield CO2 of 250 ± 10 ppm, indistinguishable from the early Pleistocene. These results suggest long‑term stability of atmospheric CO2 and CH4 and demonstrate that ice-core gas measurements can be extended into the late Pliocene, providing snapshots of climate during a era of global cooling.

via Nature|
#ch4#climate-science#co2
"Uncovering Antarctic Climate Secrets: Insights from 2,000-Foot Ice Core"
environment2 years ago

"Uncovering Antarctic Climate Secrets: Insights from 2,000-Foot Ice Core"

A 2,000-foot-long ice core from the West Antarctic Ice Sheet provides evidence of a sudden and dramatic shrinkage around 8,000 years ago, indicating the potential for rapid Antarctic ice melting and significant sea level rise. The study's findings highlight the vulnerability of the ice sheet to climate change and the catastrophic consequences of its rapid retreat. Scientists emphasize the urgent need to address climate change to avoid tipping points and improve the accuracy of models predicting future ice sheet responses.

via CNN|
#antarctic-melting#climate-change#environment
Greenland's Past and Future: Ice Cores and Climate Change Concerns
climate-change2 years ago

Greenland's Past and Future: Ice Cores and Climate Change Concerns

A recently discovered ice core from Greenland suggests that a large part of the country was ice-free around 400,000 years ago, during a period of moderate warming similar to current temperatures. The study overturns previous assumptions and warns that Greenland's ice sheet may be more sensitive to human-caused climate change than previously understood, potentially leading to irreversible, rapid melting and devastating sea level rise. If the ice sheet were to melt completely, sea levels would rise by about 7 meters (23 feet), impacting billions of people living along coastlines. The loss of ice also accelerates global warming. The findings highlight the urgent need for radical action to reduce planet-heating pollution and protect the fragile Greenland ice sheet.

via CNN|
#climate-change#global-warming#greenland