Word: arctically
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...most of the fallout from the current Soviet tests has been tropospheric. One of the radioactive air masses from the Russian Arctic test site rose into an air current that carried it from eastern Canada down the U.S. East Coast to Florida. Then it veered westward, along the Gulf Coast, dropping radioactivity that coated local pastures and showed up in the milk of grazing cows. Wandering clouds of tropospheric fallout from the Soviet tests have been detected over most of the Northern Hemisphere. They all crossed Soviet territory, many of them veering south across thickly populated parts of Russia while...
Around the equator, air from the troposphere passes upward into the stratosphere, then whirls toward the poles. When it reaches the Arctic, it sinks and re-enters the troposphere (see diagram). If the sinking air carries radioactive particles with it, they are quickly whipped around the earth by fast low-level winds and are eventually deposited on the surface in rain or snow...
...Russians are testing in the Arctic. Would it be possible for a series of these explosions to melt enough ice to cause an appreciable rise in the sea level? "No. Nuclear explosions are hot--during a blast this size the earth is receiving more energy from them than it is from the sun. But they are much too short to melt a dangerous amount of ice. There is more total energy, from start to finish, in a good-sized hurricane than in a nuclear explosion...
...North American skies were far from empty. Aloft were 1,800 NORAD fighter planes, from long-ranging F-101s to speedy new F-106s on some 6,000 intercept sorties. On the radarscopes of distant destroyers and aircraft, of early-warning stations from the Canadian Arctic and Alaska to towers planted deep in Atlantic waters, appeared a multitude of bogey blips. They were caused by about 250 Strategic Air Command B-478, B-528 and refueling tankers, along with Vulcan bombers of Britain's Royal Air Force. Many of these planes were homebound from foreign bases; others had slipped...
Sharpened Knives. Around the world, other Army units are on the picket line. G.I.s muffled in cold-weather gear patrol the white wastes of the Arctic. In the jungles of South Viet Nam, guerrilla-fighting experts of the Army's newly formed Special Forces teach villagers how to fire the Mi, then lead them on forays against the Communist raiders that are filtering across the border in increasing numbers. In Hawaii, the 25th Infantry Division is trained in the stealthy art of jungle warfare. During maneuvers, men of the 25th drill on techniques of getting along with native tribes...