# ICECORE (DD-398)

> Ice cores are long cylinders drilled from glaciers and ice sheets, some from depths of more than 3,000 meters. Snow builds up in yearly layers, and air bubbles trapped in the ice preserve samples of the past atmosphere, including greenhouse gases. Antarctic cores extend back about 800,000 years and record past climate and volcanic eruptions. The footage shows a view down a borehole in the ice.

- Department: Science (also Nature)
- First published: 2024-11-29
- Last updated: 2024-11-29
- Permalink: https://detailenjoyer.com/case/icecore/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## Quick facts

- **DD-398-F01**: Cores are drilled from ice sheets. _(Write-up · Exhibit A (Drilling))_
- **DD-398-F02**: Some exceed 3,000 m. _(Write-up · Exhibit B (Depth))_

## Write-up

Ice cores hold air bubbles hundreds of thousands of years old. Each layer records a slice of past climate.

1. **Drilling**: Cores are drilled from ice sheets.
2. **Depth**: Some exceed 3,000 m.
3. **Layers**: Snow forms annual layers.
4. **Bubbles**: Bubbles hold ancient air.
5. **Age**: Records reach about 800,000 years.

## Related case files

- [Layer by Layer (DD-470)](https://detailenjoyer.com/case/layer-by-layer/): I linked more ice layers

## Reel vs. record

- **Note**: None needed.

## Video: ICECORE: Ice Cores Hold Air Bubbles Hundreds of Thousands of Years Old

- Duration: 29.2 s · Published: 2024-11-29
- File: https://detailenjoyer.com/assets/videos/DC9uJfzptlL.mp4

### Transcript

Did you know, drilling for ice cores involves using specialized drills to extract cylindrical samples from glaciers or ice sheets, often reaching depths of thousands of meters. The drill cuts through ice, capturing sequential layers in hollow barrels. To preserve the stratified record of snow accumulation over millennia, each layer represents a specific period in Earth's history, with trapped air bubbles providing data on past atmospheric conditions such as greenhouse gas levels. Analyzing these cores offers critical insights climate patterns, volcanic activity, and human impact. NOW YOU KNOW!

## Questions & answers

**Q: What do bubbles preserve?**  
A: Atmosphere. _(Source: Write-up · Exhibit A (Drilling) · Wikipedia: Ice core)_

**Q: How far back do Antarctic cores go?**  
A: Long record. _(Source: Write-up · Exhibit B (Depth) · Wikipedia: Ice core)_

**Q: What forms layers?**  
A: Accumulation. _(Source: Write-up · Exhibit C (Layers) · Wikipedia: Ice core)_

**Q: What else do cores record?**  
A: Ash layers. _(Source: Write-up · Exhibit D (Bubbles) · Wikipedia: Ice core)_

**Q: Where are cores drilled?**  
A: Ice. _(Source: Write-up · Exhibit E (Age) · Wikipedia: Ice core)_

## Sources

- [Wikipedia: Ice core](https://en.wikipedia.org/wiki/Ice_core)

## Cite this case file

Easterling, Marcus. "ICECORE." The Detail Department (DetailEnjoyer), case file DD-398, last updated Nov 29, 2024. https://detailenjoyer.com/case/icecore/