Drilling into Earth's icy past.Drilling into Earth's icy past
It seems appropriate that investigators travel to the top of Greenland's ice cap to gather clues about Earth's glacial gla·cial
a. Of, relating to, or derived from a glacier.
b. Suggesting the extreme slowness of a glacier: Work proceeded at a glacial pace.
a. ages. U.S. and European scientists recently finished their first of four field seasons, drilling a pair of unprecedented research holes into Greenland's ice cap. The two teams are extracting cores of ice containing particles and air bubbles bubbles
symbolic of transitoriness of life. [Art: Hall, 54]
See : Brevity dating back over 200,000 years. Like a tree, the ice cap grows in annual layers. This enables scientists to trace a year-by-year history of climate change through the last two ice ages by analyzing the particles and gases locked within the annual layers.
The U.S. team, led by Paul A. Mayewski of the University of New Hampshire New Hampshire, one of the New England states of the NE United States. It is bordered by Massachusetts (S), Vermont, with the Connecticut R. forming the boundary (W), the Canadian province of Quebec (NW), and Maine and a short strip of the Atlantic Ocean (E). in Durham, is drilling a 3,200-meter-deep hole about 30 kilometers from the ice cap's summit, the site of the European drilling. The two teams will compare findings.
The cores will reach back through the last ice age, which began about 120,000 years ago, into the warm interglacial in·ter·gla·cial
Occurring between glacial epochs.
A comparatively short period of warmth during an overall period of glaciation. time, and then back into the previous ice age. Meanwhile, Soviets continue to drill the Vostok hole into the Antarctic ice sheet The Antarctic ice sheet is one of the two polar ice caps of the Earth. It covers about 98% of the Antarctic continent and is the largest single mass of ice on Earth. The total ice mass on the Earth covers an area of almost 14 million square km and contains 30 million cubic km of -- a hole that presently reaches back more than 160,000 years.