Examining Arctic lake sediment core

Three men kneel in the snow while examining a long thin core of sediment, one man pointing and talking, one man taking notes.

Detailed Description

John Pohlman (USGS, left) and colleagues from the University of Alaska Fairbanks examine a sediment core retrieved through winter ice from the bottom of a lake in northern Alaska. Such cores are used to reconstruct methane emissions and climate history over the past 20,000 years.


Image Dimensions: 2592 x 1944

Date Taken:

Location Taken: AK, US