Climate of the Arctic continuously, with 30 stations in the Arctic from 1950 to 1991. These stations collected data that are valuable to this day for understanding the climate of the Arctic Basin. shows the location of Arctic research facilities during the mid-1970s and the tracks of drifting stations between 1958 and 1975. Another benefit from the Cold War was the acquisition of observations from United States and Soviet naval voyages into the Arctic. In 1958 an American nuclear submarine, the "Nautilus" was the first ship to reach the North Pole. In the decades that followed submarines regularly roamed under the Arctic sea ice,
Hans Tausen Ice Cap Hans Tausen Ice Cap Hans Tausen Ice Cap () is an ice cap in northern Greenland. Ice cores show it is around 3500–4000 years old. It formed since the Holocene climatic optimum of 6000-8000 BP. The ice cap is about 100 km from north to south and 80 km from east to west and sits on a 1300 m high plateau. The Hans Tausen Ice Cap is the source of many glaciers, including Ymer Glacier, Lur Glacier and the Tjalfe Glacier. It is a well studied ice cap, and is important to understanding the last Climatic Optimum. (Holocene climatic optimum)