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Scientists unlock 1.2 million years of climate history

Scientists unlock 1.2 million years of climate history

New Capabilities

Antarctic ice core drilling reaches record depths to solve ancient climate mysteries

November 1st, 2025: Final Drilling Campaign Launches

Overview

In early January 2025, an international team drilling through Antarctic ice hit bedrock at 2,800 meters depth. They pulled up ice more than 1.2 million years old—the oldest continuous climate record ever extracted. Trapped in the frozen layers are samples of ancient atmospheres in air bubbles, offering a direct window into greenhouse gas concentrations across multiple glacial cycles.

The stakes: Scientists want to solve one of climate science's biggest puzzles—why Earth's ice ages suddenly shifted from 41,000-year cycles to 100,000-year cycles around 900,000 years ago. Previous ice cores reached back 800,000 years, missing the transition period; this core spans it completely. Understanding how climate systems reorganized during that shift could illuminate how today's rapidly changing atmosphere behaves.

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Key Indicators

1.2M
Years of continuous climate data
Previous record was 800,000 years from EPICA Dome C in 2004
2,800m
Drilling depth to bedrock
Nearly two miles through Antarctic ice at -35°C average temperature
300ppm
Historic CO2 ceiling
800,000 years of ice cores never showed CO2 above this—until now it's 420ppm
12
Research institutions involved
Scientists from 10 European nations coordinated by Italy's CNR-ISP

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People Involved

Organizations Involved

Timeline

January 1996 November 2025

10 events Latest: November 1st, 2025 · 7 months ago
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  1. Final Drilling Campaign Launches

    Latest Field Operations

    Fifth and final season begins to collect duplicate samples and drill into bedrock beneath ice sheet.

  2. Laboratory Analysis Begins

    Research Phase

    European facilities start measuring isotopes in ice and analyzing trapped air bubbles for greenhouse gas concentrations.

  3. Ice Cores Transported to Europe

    Logistics

    Research vessel Laura Bassi carries frozen cores from Antarctica to European laboratories for analysis.

  4. Bedrock Reached: 1.2 Million-Year Ice Extracted

    Scientific Breakthrough

    Team hits bedrock at 2,800 meters, confirming continuous ice record extending beyond 1.2 million years—oldest ever extracted.

  5. 1,836 Meters Depth Reached

    Progress Update

    Third drilling campaign extends core to 1,836 meters, approaching depth where 1-million-year ice expected.

  6. 808 Meters Depth Reached

    Progress Update

    Second drilling campaign successfully reaches 808-meter depth after overcoming equipment challenges.

  7. Beyond EPICA Drilling Commences

    Research Initiative

    International team begins drilling at Little Dome C with €11 million EU funding, aiming to capture mid-Pleistocene transition.

  8. Site Selection for Beyond EPICA Begins

    Preparatory Work

    Ground-penetrating radar surveys identify Little Dome C as optimal location for reaching 1.5 million-year ice.

  9. EPICA Reaches 800,000-Year Record

    Scientific Milestone

    Drilling completes at Dome C, reaching 3,270 meters depth. Ice core sets record extending back 800,000 years.

  10. Original EPICA Project Launches

    Research Initiative

    European Science Foundation coordinates drilling at two Antarctic sites to extend ice core records beyond previous 400,000-year limits.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

1996-2004

EPICA Dome C Core (2004)

The original European Project for Ice Coring in Antarctica drilled 3,270 meters at Dome C, extracting ice dating back 800,000 years. The core revealed eight complete glacial-interglacial cycles and showed that CO2 concentrations never exceeded 300 parts per million during the warmest interglacial periods—far below today's 420ppm.

Then

Revolutionized understanding of greenhouse gas-climate relationships, becoming most-cited paleoclimate dataset.

Now

Established baseline showing modern CO2 levels unprecedented in 800,000 years, strengthening climate change projections.

Why this matters now

Beyond EPICA aims to extend this record to capture the critical period EPICA missed—the transition when glacial cycles fundamentally changed character.

1970-1998

Vostok Ice Core (1970s-1998)

Soviet and Russian scientists drilled at Vostok Station in East Antarctica, eventually reaching 3,623 meters and extracting ice up to 420,000 years old. The core demonstrated tight correlation between atmospheric CO2 and Antarctic temperature across glacial cycles.

Then

First ice core extending beyond 100,000 years, proving ice age cycles linked to greenhouse gases.

Now

Sparked debate about whether CO2 drives temperature or vice versa, later resolved showing both through feedbacks.

Why this matters now

Vostok pioneered deep ice core drilling in extreme Antarctic conditions, proving the technical feasibility of projects like Beyond EPICA.

1.25-0.7 million years ago

Mid-Pleistocene Transition Climate Shift (1.2-0.9 Mya)

Earth's glacial-interglacial cycles abruptly shifted from regular 41,000-year oscillations (driven by axial tilt changes) to irregular 100,000-year cycles with much larger ice sheets and more extreme climate swings. The transition occurred gradually over roughly 550,000 years.

Then

Northern Hemisphere ice sheets began growing far larger and persisting longer before collapsing rapidly.

Now

Established the climate regime humans evolved within—long ice ages interrupted by brief warm periods like today.

Why this matters now

This is the mystery Beyond EPICA targets. Understanding why stable 41,000-year cycles gave way to volatile 100,000-year cycles could reveal how climate systems respond to gradual forcing—directly applicable to understanding how today's rapid CO2 rise might trigger nonlinear responses.

Sources

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