Let's do a little math. If the average thickness of a single Greenland ice core layer is 2 meters and the longest ice core measures 1,900 meters in dept, how long must it have taken for those 1,900 meters of ice to have formed? I'm coming up with 950 years, not hundreds of thousands of years.
Average thickness of Greenland ice core layers
Average Thickness of Greenland Ice Core Layers
The average thickness of a single layer in a Greenland ice core is typically about 1–2 meters. This corresponds to roughly one year’s worth of snow accumulation in the ice sheet’s climate record Center for Science Education.
How layer thickness relates to climate
- Layer formation: Each year, snow falls on the ice sheet and compresses over time into a distinct layer. The thickness of that layer depends on the amount of snowfall that year.
- Thicker layers: Indicate higher snowfall, often linked to warmer global climates, because more precipitation falls at the poles when temperatures are higher Center for Science Education.
- Thinner layers: Suggest lower snowfall, often associated with cooler periods.
- Seasonal resolution: In some cores, especially from high-elevation sites, layers can be resolved to seasonal detail, allowing scientists to study annual and even seasonal climate changes.
Context for Greenland ice cores
- The longest Greenland ice cores extend back over 3 km (about 1,900 meters) in depth, representing hundreds of thousands of years of climate history Center for Science Education.
- Layer thickness varies with location, elevation, and climate conditions. For example, cores from the North Greenland Ice Core Project (NGRIP) and NGRIP-2 show annual layers averaging 1–2 m, with some years exceeding 3 m during high-snowfall periods and others less than 1 m during low-snowfall years Center for Science Education.
In summary:
If you see a layer in a Greenland ice core, it’s usually about 1–2 meters thick, representing one year’s snowpack, with variations reflecting annual climate conditions. Wikipedia
