Mark S. Twickler

TL;DR: This article used the GISP2 ice core to develop a continuous record of explosive volcanism over the past 110,000 yr. They identified ∼850 volcanic signals with sulfate concentrations greater than that associated with historical eruptions from either equatorial or mid-latitude regions that are known to have perturbed global or Northern Hemisphere climate, respectively.

TL;DR: An ice core in south Greenland covering the period 1869 to 1984 was analyzed for oxygen isotopes and chloride, nitrate, and sulfate concentrations and shows that the "excess" sulfate concentration has tripled and the nitrate concentration has doubled.

TL;DR: In this paper, the transition between the Younger Dryas and Holocene climate periods occurred over a 40-year period and most of the transition occurred in a series of steps with durations of about 5 years.

TL;DR: In this paper, the major ions contained in the Greenland Ice Sheet Project 2 (GISP 2) ice core from the present to ∼674 A.D. were analyzed to yield an environmental reconstruction for this period that includes a description of nitrogen and sulfur cycling, volcanic emissions, sea salt and terrestrial influences.

TL;DR: High-resolution glaciochemical series from a central Greenland ice core and a new site in east Antarctica display similar variability, suggesting that rapid climate change events occur more frequently in Antarctica than previously demonstrated.