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... Science Frontiers ONLINE No. 51: May-Jun 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Antarctic Ozone Hole Has Complex Structure "One more mystery has been added to the seasonal loss of ozone in the stratosphere over Antarctica. It now appears that the 'hole' is an uneven one, with 2- to 3-kilometer-thick slices of ozone-poor air sandwiched within layers of only minimal depletion." These new data came from McMurdo Sound, where a series of balloons carrying ozone sensors were released. Ozone depletion seems to be confined to the region 12-20 kilometers altitude and the top of the stratosphere. The overall depletion in this region was 35% at the time the balloons were lofted. However, ... zones from 1 to 5 kilometers thick showed depletions as great as 90%. The reason for this stratificaiton is not yet known. (Silberner, J.; "Layers of Complexity in Ozone Hole," Science News, 131:164, 1987.) From Science Frontiers #51, MAY-JUN 1987 . 1987-2000 William R. Corliss ...
Terms matched: 2 - Score: 243 - 15 May 2017 - URL: /sf051/sf051g14.htm
... to an altitude of 10 km, where winds would insure global distribution. In terms of biological stress, the 10-km projectile would transfer 40-50% of its kinetic energy to the atmosphere, creating a heat pulse that could raise global temperatures 30 C (50 F) for several days. Many large animals might well succumb to such a temperature transient. In addition, the protective ozone layer might be blown away by shock waves and not reform for a decade. (O 'Keefe, John D., and Ahrens, Thomas J.; "Impact Mechanics of the Cretaceous-Tertiary Extinction Bolide," Nature, 298,123, 1982.) Reference. We catalog biological extinctions at ESB1 in Anomalies in Geology. To order this book, visit: here . ... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The cretaceous-tertiary extinction bolide The recently discovered worldwide iridium-rich layer is taken by many scientists as evidence of the collision of an asteroid or comet with the earth about 65 million years ago. This cataclysmic event is also blamed (by some, at least) for the apparent sudden biological extinctions recorded on these pages of the fossil record. In this setting, the authors of this paper calculate the effects on the earth of a 10-kilometer-diameter object impacting at about 20/km/sec. Do the theoretical results jibe with the geological and paleontological data? Very definitely. Crater ejecta rich in extraterrestrial material would be ...
Terms matched: 2 - Score: 145 - 15 May 2017 - URL: /sf023/sf023p09.htm
... interfere with terrestrial communications and knock out power grids. But we are lucky it isn't worse. Studies of stars in our galaxy similar to the sun find that they emit super-flares about once every century. If our sun sent such a super-flare our way, the atmosphere would glow like a neon tube, our fleet of satellites would be fried, and half the protective ozone layer would disappear in a flash. Earth life would survive -- at least for a while. Our sun, it seems, is favored with anomalous stability, but no one knows why. We are simply lucky! (Seife, Charles; "Thank Our Lucky Star," New Scientist, p. 15, January 9, 1999.) Comment. We also live in a ... lucky" galaxy. (See NOW WE KNOW WHY...later in this issue.) The universe is anthropic (i .e ., favoring humans) at all levels! From Science Frontiers #122, MAR-APR 1999 . 1999-2000 William R. Corliss ...
Terms matched: 2 - Score: 144 - 15 May 2017 - URL: /sf122/sf122p03.htm
... " A particularly important implication of this undersea light source is that the evolution of photosynthesis need not have been dependent upon the existence of life on land. Also, hydrothermal vents could have served as refuges for photosynthesizing life forms down the geological eons when: (1 ) ocean surfaces were ice-covered; (2 ) the terrestrial surface was exposed to deadly levels of radiation, as when the ozone layer was destroyed; and (3 ) when volcanism or dust from meteor impacts blackened the skies. (Van Dover, Cindy Lee; "Biology in Extreme Environments at Deep-Sea Hydrothermal Vents," Eos, 70:F54, 1998.) From Science Frontiers #124, JUL-AUG 1999 . 1999-2000 William R. Corliss ...
Terms matched: 2 - Score: 134 - 15 May 2017 - URL: /sf124/sf124p08.htm
... Glory Phenomenon and Other Roll Clouds GWC13 Long, Hollow, Cylindrical Clouds GWC14 Cloud Spokes Radiating from Thunderclouds GWC15 Excess of Ice Crystals in Cumulus Clouds GWC16 Cloud Brightness Changes GWC17 Anomalous High-Altitude Haze Green Clouds [GWH] Bright-Night Phenomenon High-Altitude Layers of Material Natural Sodium Clouds Bromine Pulses Arctic Plumes Stratospheric Water Flow and Reservoirs Miscellaneous Unexplained Clouds Holes in the Ionosphere (Icy Comets) Ozone Holes Ozone Clouds GWD DARK DAYS, FOGS, AND OTHER OBSCURATIONS GWD1 Dark Days GWD2 Pogonips and Other Ice Fogs GWD3 Mists and Epidemics GWD4 Dry Fogs and Dust Fogs GWF FALLS GWF1 Ice Falls or Hydrometeors GWF2 Stone Falls GWF3 Sulphur/Pollen Falls GWF4 Falls of Miscellaneous Inorganic Substances GWF5 The Fall of Manna GWF6 Unusual Falls of Hay and Leaves GWF7 Gelatinous Meteors or Pwdre Ser GWF8 Prodigious Falls of ... Lightning GLL28 Bipolar Nature of Large Electrical Storms GLL29 Gamma-Ray Flashes in Thunderstorms GLL30 Neutron Generation in Lightning Bolts GLL31 Unusual (Usually Deadly) Interactions between Lightning and Humans GLL32 Effects of Lightning on Vehicle Engines Sympathetic Lightning Gamma-Ray Emission by Lightning Mystery Mountain Deaths and Lightning Lightning and Anomalous Optical Events (AOEs) Lightning Kills Many More Males Than Females Impending Lightning Stalling Cars Post-Lightning Glows Layered Lightning Slow Lightning GLM LOW-LEVEL METEOR-LIKE PHENOMENA GLM1 Low-Level Meteor-Like Objects GLM2 Darting Gleams of Light People Hit by Meteorites Nuclearites Tunguska Event Meteoric Nightglow Spacecraft Glows GLN NOCTURNAL LIGHTS GLN1 Low-Level Nocturnal Lights: (Spook Lights, etc.) GLN2 High-Level Nocturnal Lights (Non-Meteoric) GLW MARINE PHOSPHORESCENT DISPLAYS GLW1 Long, Parallel, Stationary Phosphorescent ...
Terms matched: 2 - Score: 128 - 15 May 2017 - URL: /cat-geop.htm
