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1. |
Trace contaminants measured in the Atlantic Ocean |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 2,
1996,
Page 9-13
Gregory A. Cutter,
William M. Landing,
Chris I. Measures,
Philip A. Yeats,
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摘要:
The concentrations and distributions of more than 18 trace metals were recently measured in both deep and surface waters of the Atlantic Ocean by two international sampling efforts. The measurements serve a dual purpose: they are valuable for monitoring elemental concentrations and also have the power to reveal biogeochemical processes that affect trace metals. This information is critically important for predicting the fate of any potential contaminant in the marine environment. Preliminary results from the two surveys show that the major water masses in the Atlantic have characteristic trace metal signatures and that the simultaneous use of multiple tracers to unravel geochemical questions is quite promising.
ISSN:0002-8606
DOI:10.1029/95EO00007
年代:1996
数据来源: WILEY
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2. |
Igniting interest in educators and students: Focus on Mars Pathfinder |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 2,
1996,
Page 10-10
Sheri L. Klug,
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摘要:
High‐tech subjects such as space exploration and spacecraft design seem light years away from student's everyday lives. Lack of resources, lack of technology, and sometimes lack of vision of what the future might hold can be formidable obstacles to overcome when we attempt to expand our student's horizons beyond Earth. As a participant in the Mars Pathfinder Landing Site Workshop, I discovered the incredible benefits that a partnership between scientists, engineers, and educators can reap for our citizens of the future. Last September, in preparation for the July 1997 Pathfinder landing on Mars, I was one of thirteen educators who joined scientists and engineers in eastern Washington's Channeled Scablan
ISSN:0002-8606
DOI:10.1029/95EO00009
年代:1996
数据来源: WILEY
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3. |
Scientists need better tools to measure water vapor |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 2,
1996,
Page 11-11
Michael Carlowicz,
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PDF (257KB)
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摘要:
More than any other greenhouse gas, water vapor controls the thermostat of Earth. Yet we still have a lot to learn about this simple molecule that plays a diverse and dynamic role, according to a special report released in December by AGU.Our ability to measure water vapor in the atmosphere is inadequate, noted Dian Gaffen, a convener of the October 1994 Chapman Conference on water vapor and a meteorologist at the Air Resources Laboratory of the National Oceanic and Atmospheric Administration. Gaffen presented the special report, entitled “Water Vapor in the Climate System,” on December 14 at the AGU Fall Meeting in San Francisco. The 15‐page report distills the presentations and discussions witnessed at the Chapman Conference down to a synopsis that can be read by teachers, students, and policym
ISSN:0002-8606
DOI:10.1029/95EO00011
年代:1996
数据来源: WILEY
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4. |
Comment on [“Plasma Physics: An Introductory Course”] Book Review |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 2,
1996,
Page 12-12
Duncan A. Bryant,
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摘要:
The review ofPlasma Physics: An Introductory Course[Eos76, p.53, 1995] is marred by a serious inaccuracy and several misleading omissions. The review reports, erroneously, that chapter 9 part 1 states that“…electric fields due to space charge separation play no role in charged particle acceleration at shocks or in the auroral region.” The fact is that the chapter describes and advocates a mechanism (Landau damping) by which acceleration at these locations is caused by electrostatic waves where “the motion of the electrostatic barrier…is essential for energy transfer.”The statement to which the review refers carries the crucial, and twice explicitly mentioned, qualification that the space‐charge electric field is static, relative to particle transit time, and, therefore, effectively conservative. When properly represented, therefore, the statement is seen to follow directly from one of the basic principles of physics—the conservative nature of fields due to central forces, from which it is clear that it is no more possible for energy to be delivered by unchanging (in the observing frame) electrostatic fields than it is possible for an engine to run on gravity. In citing the simulation literature as offering strong evidence against this “opinion,” as it is described, the review neglects to mention that the chapter challenges such evidence with the prediction that all models claiming to accelerate particles by unchanging electrostatic fields will be found to contain a major flaw, such as equipotentials that are
ISSN:0002-8606
DOI:10.1029/95EO00013
年代:1996
数据来源: WILEY
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5. |
Old man and the sea |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 2,
1996,
Page 18-18
Anonymous,
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摘要:
An 82‐year‐old man who was unconscious and adrift in the Pacific Ocean recently turned up in an unusual location: the satellite readouts of the National Oceanic and Atmospheric Administration (NOAA).After getting smacked by the swinging boom of his sailboat and falling overboard, the man swam back to his boat, climbed aboard, and fell unconscious in the cabin. But his electronic equipment was wide awake. After an extended period with no activity onboard the ship, the emergency position indicating radio beacon (EPIRB) activated itself and radioed a distress signal which was picked up by the COSPAS‐SARSAT system. The man was located and retrieved from the Pacific by the U.S. Air Force, 1650 km southwest of San
ISSN:0002-8606
DOI:10.1029/EO077i002p00018-02
年代:1996
数据来源: WILEY
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