... Science Frontiers ONLINE No. 137: SEP-OCT 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Fuzz In The Climate Record Climatologists have bet heavily on their analysis of cores extracted from the ice sheets of Greenland and Antarctica. Their trace impurities are believed to accurately record the earth's climate over the last several hundred thousand years. The temporal accuracy of this record is based upon the assumption that these impurities have not migrated vertically from where they were deposited. This assumption is now under severe stress with the discovery of anomalous diffusion within ice plus a phase phenomenon called "premelting," both of which result in the transport of the climate-marking impurities far from their original layer of deposition. A.W . Rempel et al ... below (in the jargon of climatologists): .. .under conditions that resemble those encountered in the Eemian interglacial ice of central Greenland (from about 125,000 to 115,000 years ago---impurity fluctuations may be separated from ice of the same age by as much as 50 cm. This distance is comparable to the ice thickness of the contested sudden cooling events in the Eemian ice from the GRIP core. Translation: The accepted picture of the earth's climate history over the last few hundred thousand years may be seriously distorted. (Rempel, A.W ., et al; "Possible Displacement of the Climate Signal in Ancient Ice by Premelting and Anomalous Diffusion," Nature, 411:568, 2001.) Comment. This discovery could impact the ...

... icy minicomets Mercury, closest planet to the sun, should be baked bone dry, seeing that equatorial temperatures reach 800 F. When Mariner 10 flew past Mercury in 1974, its camera eye reinforced the baked-cinder model. To everyone's surprise, recent radar images obtained with powerful earth-based antennas, revealed a highly reflective patch at Mercury's north pole. Could it be ice, for ice reflects radar waves well? Quite possibly, for when Mercury's polar temperatures are calculated, away from the sun's direct glare, they plunge to -235 F. This means that some of the water vapor in the planet's thin atmosphere might freeze out in the poles, creating ice or frost caps. Wouldn't Mariner 10 have seen such a ... deposit? Not necessarily, for the spacecraft viewed only half the planet and, if the 640 x 300-kilometer ice patch were covered with dust, it could have been invisible to the camera. But it would still be a bright patch on terrestrial radar scopes, because radars see through thin dust layers. So, polar ice is not physically impossible on Mercury, although it is defi nitely surprising so close to the sun. All that is needed is a little water in the planet's atmosphere. Mainstream thinking is that "passing comets and asteroids" might bequeath Mercury some of their H2O cargos. (Cowen, R.; "Icy Clues from Mercury's Other Half," Science News, 140:295, 1991.) Also: Wilford, John Noble; ...

... Science Frontiers ONLINE No. 138: NOV-DEC 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects When The Antarctic Was Warm The analyses of ocean-floor sediments deposited recently by melting Antarctic ice sheets reveal that these ice sheets are only about 2,000 years old. The evidence is in the rocky debris scraped up from inland Antarctica and then transported out to sea, where it drops to the sea floor as the ice melts. The grains of rock settle into the ocean sediments which contain biological debris that can be carbon-dated. (Marine life beneath the ice sheets is surprisingly abundant and varied despite the near-freezing temperatures.) A somewhat politically incorrect observation appears in this article. However, the news that the Antarctic ... Science Frontiers ONLINE No. 138: NOV-DEC 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects When The Antarctic Was Warm The analyses of ocean-floor sediments deposited recently by melting Antarctic ice sheets reveal that these ice sheets are only about 2,000 years old. The evidence is in the rocky debris scraped up from inland Antarctica and then transported out to sea, where it drops to the sea floor as the ice melts. The grains of rock settle into the ocean sediments which contain biological debris that can be carbon-dated. (Marine life beneath the ice sheets is surprisingly abundant and varied despite the near-freezing temperatures.) A somewhat politically incorrect observation appears in this article. However, the news that the Antarctic ...

... Science Frontiers ONLINE No. 104: Mar-Apr 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A METEORITIC EVENT LAYER IN ANTARCTIC ICE "Where the East Antarctic icesheet meets the Transantarctic Mountains, old, deep glacial ice is tilted upward and exposed. Within this visible cross section of the icesheet, layers of dark volcanic tephra serve as stratigraphic markers and datable age horizons. Systematic sampling of these layers at a well-known meteorite collection site (the Allan Hills Main Icefield) has revealed a band consisting of unusually dark and rounded particles, many of which are spheroidal. This debris layer (BIT-58) extends parallel to the stratigraphy of the ice established from the tephra bands, and thus apparently marks a single depositional event. ... kilograms of ice from two sites along this band were subsequently collected and melted, yielding a few grams of sediment for further study." Microscopic examination and microprobe analysis led to the following conclusions: "Although direct evidence of an extraterrestrial origin for this debris layer (such as the presence of cosmogenic 10 Be and 26Al) has not yet been obtained, the available data strongly suggest that this sediment originated as meteoritic spallation debris. This debris is distinct from other Antarctic 'cosmic dust' collections by virtue of its uniform, recognizable, ordinary chondrite composition and the consistent relation shown between grain size and texture. The BIT-58 layer probably originated from a single transient event, the passage and/or impact of a single large meteorite over the East Antarctic icesheet." (Harvey, R ...

... about the staggering quantities of methane and higher hydrocarbons locked up in frozen hydrates around the edges of the continents. Actually, the small methane burps are minor problems compared to the catastrophic climate changes that could be forced if just a small portion of the gases frozen under the sea floor were released into the atmosphere. Gas-hydrates are unimpressive when brought to the surface -- just dirty, fizzy ice. However, taken together, they contain more carbon than all the world's oil fields, perhaps much more. Most estimates fall between 1,700 and 11,000 billion tons, but there is one scientist who pegs these cold-storage carbon deposits at 4,100,000 billion tons. In comparison, human releases of carbon to the atmosphere via the burning of wood ... gas, coal, and even the collective flatulence of all the planet's animals are trivial. Geological evidence confirms that past climate swings were associated with large injections of carbon into the atmosphere and oceans. A major contributor to these "carbon burps" may be decomposing methane hydrate. Until recently, climatologists have questioned the sizes of gas-hydrate deposits, but cores extracted from the Blake Ridge off the Carolina coast confirm the immense amounts of gases precariously locked up in sea-floor sediments. The stratum of gas hydrates in the Blake Ridge alone covers 26,000 square kilometers -- enough gas is there to supply the U.S . for 107 years. In biological terms the Blake Ridge's carbon is equal to 7% of the carbon locked up in all terrestrial biota ...

... off the Carolina coast. Another pockmark field is the subject of P.R . Vogt et al (Ref. 2). It occupies a strip about 1.3 km wide and 50 km long between Greenland and Spitzbergen. This strip of pockmarks seems to be underlain by a deposit of methane hydrate 200-300 meters thick. [Methane hydrate is a weird substance that looks like dirty ice. When brought to the surface, the methane fizzes away, leaving only a puddle of dirty water!] Lastly, in Ref. 3, C.K . Paull et al report on the release of plumes of methane bubbles from the Carolina continental rise at a depth of 2167 meters. Here, the sediments are riddled with methane hydrate. Why all this fuss over fizzy ice, ... and methane bubbles still stream up from buried organic matter. Natural-gas plume rising from the sea-floor off the Carolina coast. Another pockmark field is the subject of P.R . Vogt et al (Ref. 2). It occupies a strip about 1.3 km wide and 50 km long between Greenland and Spitzbergen. This strip of pockmarks seems to be underlain by a deposit of methane hydrate 200-300 meters thick. [Methane hydrate is a weird substance that looks like dirty ice. When brought to the surface, the methane fizzes away, leaving only a puddle of dirty water!] Lastly, in Ref. 3, C.K . Paull et al report on the release of plumes of methane bubbles from the Carolina continental rise at a depth of ...

... Science Frontiers ONLINE No. 98: Mar-Apr 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Six Immense Armadas Of Icebergs Invaded The North Atlantic "Observations of large and abrupt climate changes recorded in Greenland ice cores have spurred a search for clues to their cause. The search has revealed that at six times during the last glaciation, huge armadas of icebergs launched from Canada spread across the northern Atlantic Ocean, each triggering a climate response of global extent." The foregoing abstract does not mention the interesting Heinrich layers that fostered the above scenario. In 1988, H. Heinrich published a paper describing a curious set of sedimentary layers found in cores drilled in the tops of the Dreizack seamounts in the eastern North Atlantic. Heinrich concluded that ... of the six layers he found represented the melting of "six great armadas of icebergs." These icebergs carried debris picked up in Canada and, as they melted, deposited it on the seamounts and ocean floor. Each layer could be correlated with the major climate boundaries revealed by the Greenland ice cores. Very fittingly, these iceberg incursions are now termed "Heinrich Events." (Broecker, Wallace S.; "Massive Iceberg Discharges as Triggers for Global Climate Changes," Nature, 372:421, 1994.) From Science Frontiers #98, MAR-APR 1995 . 1995-2000 William R. Corliss ...

... Arkansas is hundreds of kilometers from any ocean. Could a tsunami ever reach Little Rock, or even 120 kilometers northeast of Little Rock where, atop a 76-meter (250-foot) hill are perched giant blocks of sandstone. These blocks range up to 7.6 meters (25 feet) in size and weigh many tons. No native rocks in the area match them. The Ice Age glaciers never reached Arkansas, so they can't be glacial erratics. Where did they come from? One clue is the presence of glauconite in the sandstone. Glauconite is common in marine rocks, so suspicion points toward the Gulf of Mexico. Geologist G. Patterson, University of Memphis, thinks that the huge chunks of sandstone came from coastal Louisiana and were carried some 650 kilometers ... Science Frontiers ONLINE No. 121: Jan-Feb 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects An Arkansas Tsunami Deposit?Yes, Arkansas is hundreds of kilometers from any ocean. Could a tsunami ever reach Little Rock, or even 120 kilometers northeast of Little Rock where, atop a 76-meter (250-foot) hill are perched giant blocks of sandstone. These blocks range up to 7.6 meters (25 feet) in size and weigh many tons. No native rocks in the area match them. The Ice Age glaciers never reached Arkansas, so they can't be glacial erratics. Where did they come from? One clue is the presence of glauconite in the sandstone. Glauconite is common in marine rocks ...

... stress. These large structures may not be salt features; nonetheless, salt features should exist on Venus." (Wood, C.A ., and Amsbury, D.; "Salt Structures on Venus," American Associa tion of Petroleum Geologists, Bulletin, 70:664, 1986.) Comment. Perhaps Venus had its "Salt Ages" just like the earth had its "Ice Ages"! From Science Frontiers #46, JUL-AUG 1986 . 1986-2000 William R. Corliss ...

... of Terrestrial Auroras and the Phenomena of Distant Comets ACO12 Blinking Comets ACO13 The Anomalous Disappearance of Comets ACO14 Anomalous Brightening of Short-Period Comets ACO15 Comet Reflectivities Are Similar to Those of Asteroids ACO16 Some Cometary Light Curves Resemble Those of Asteroids ACO17 New Comets Exhibit Different Brightening Behavior Than Old Comets ACO18 Anomalous Splitting of Comets ACO19 Tail-Wagging Comets ACO20 Cometary Outbursts ACO21 Comet Attrition Rates Imply Youth ACO22 No Ices in Cometary Reflection Spectra ACO23 The Blackness of Cometary Nuclei ACX OCCULTATIONS BY COMETS ACX1 Cometary Tails: Anomalous Occultations of Radio Stars AE ENIGMATIC OBJECTS AEO BRIGHT ENIGMATIC OBJECTS AEO1 Bright Objects near the Sun AEO2 Starlike Objects with Anomalous Motions AEO3 Unexplained Nebulous Objects AEX UNIDENTIFIED OBJECTS TRANSITING THE SUN, MOON, AND PLANETS AEX1 Objects Crossing the Face of the Sun AEX2 Objects Crossing the Moon's Disk AEX3 ... Asymmetry AME9 The White Rock AME10 Anomalous Frost on the Martian Surface AME11 Polar Features near the Equator AME12 Ice-Cap Melting Correlated with Solar Activity AME13 Excess of Grazing-Incidence Craters AME14 Unidentified Active Ingredient in Martian Soil and the Possibility of Life AME15 Lack of Water-Ice at the Southern Polar Cap AME16 Anomalously Wet Areas AME17 Spectroscopic Evidence of Vegetation AME18 Apparent Lack of Extensive Surface Erosion AME19 Layered Deposits AME20 Evidence for an Episode of Accelerated Crater Obliteration AME21 Pedestal Craters and Their Eroded Environs AME22 Flow-Like Character of Crater Ejecta AME23 The Tharsis Bulge AMF LUMINOUS PHENOMENA ON MARS AMF1 Flares and Light Flashes AML THE CURIOUS SATELLITES OF MARS AML1 Possible Early Sightings of the Martian Satellites AML2 The Grooves of Phobos AML3 The Anomalous Acceleration of Phobos AMO MARTIAN TELESCOPIC ANOMALIES AMO1 The Martian Canals AMO2 Pre- ...

... any carbonate minerals that should have been created when water interacted chemically with the planet's CO2 atmosphere. Surface photos fail to show the fine networks of tributaries that should have fed the larger drainage features if water were the agent of erosion. There is no evidence of large lakes or reservoirs at the heads of the so-called "flood channels." Except for a small amount of water ice at the poles, Mars is dominated by solid and gaseous CO2. One would not expect that carbon dioxide could mimic erosion features like those carved out by terrestrial water. However, Hoffman points to the devastating erosion caused by terrestrial volcanic explosions with their blasts of gases and ash, their mudflows, and their avalanches that gouge the terrain for many miles. (O 'Hanlon, Larry; ... Sourcebook Project Sourcebook Subjects White Mars?Earth is called the "blue planet" by virtue of its thin veneer of blue ocean water. Mars is now red because of its endless vistas of reddish soil and rocks, But most planetary scientists now insist that Mars was once blue, too. It was drained by gushing rivers and supported a vast ocean. The planet's many channels and layered deposits seem to prove Mars was, like Earth, once a water-rich planet. We like to think this way because we so much want to find life on our sister planet, and to us water is life! Not so fast! says N. Hoffman from La Trobe University in Victoria, Australia. According to his hypothesis, water has had little or no importance in shaping the ...