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1. |
Studying Arctic sea ice at two scales provides more accurate picture |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 50,
1996,
Page 501-506
James E. Overland,
W. F. Weeks,
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摘要:
Historically, sea ice has been viewed on distinct scales depending on the problem understudy. Researchers rarely investigated the knowledge needed to bridge these scales. Two developments, however, are changing the status quo. Ice motions on scales of 5 km can now be observed using all‐weather data collected by synthetic aperture radar (SAR) sensors on satellites combined with automated image analysis procedures. Second, the increased availability of high‐speed computer resources has made it feasible to resolve spacings of 10 km even in numerical models of the Arctic basin. In short, we now can observe and model pack ice on scales that approximate its granularity. Preliminary results using these new abilities confirm that sea ice behaves like a hardening plastic material on scales of 1–1
ISSN:0002-8606
DOI:10.1029/96EO00330
年代:1996
数据来源: WILEY
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2. |
Virtual classroom |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 50,
1996,
Page 502-502
Michael Carlowicz,
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PDF (109KB)
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摘要:
After four decades of perfecting techniques for communication with spacecraft on the way to other worlds, space scientists are now working on new ways to reach students in this one. In a partnership between NASA and the University of North Dakota (UND), scientists and engineers from both institutions will soon lead an experiment in Internet learning.Starting January 22, UND will offer a threemonth computerized course in telerobotics. Using RealAudio and CU‐SeeMe channels of the Internet to allow real‐time transmission of video and audio, instructors will teach college‐and graduate‐level students the fundamentals of the remote operation and control of
ISSN:0002-8606
DOI:10.1029/EO077i050p00502-04
年代:1996
数据来源: WILEY
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3. |
International guidelines cover research in foreign countries |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 50,
1996,
Page 503-503
Anonymous,
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PDF (114KB)
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摘要:
To foster a spirit of cooperation and respect in international research, geophysical societies from 22 countries have agreed upon “Guidelines for Scientists Conducting Research in Foreign Countries.” Initially proposed during an international convocation of representatives ofgeoscience societies, these guidelines are unique for the spirit of international cooperation that they engender. Developed by representatives from a broad spectrum of Earth sciences, the Guidelines cut across disciplinary boundaries and are appropriate for researchers undertaking any scientific work outside of their own countr
ISSN:0002-8606
DOI:10.1029/96EO00334
年代:1996
数据来源: WILEY
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4. |
Aging of oceanic crust at the Southern East Pacific Rise |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 50,
1996,
Page 504-504
W. Weigel,
I. Grevemeyer,
N. Kaul,
H. Villinger,
T. Lüdmann,
H. K. Wong,
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PDF (291KB)
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摘要:
The oceanic crust covers almost 57% of the Earth's surface and is created by seafloor spreading at mid‐ocean ridges. Although crustal structure is similar everywhere, seismic experiments near spreading ridges indicate that seismic velocities in the top of the igneous crust are typically much lower than those in mature oceanic crust. While profound differences between juvenile and mature crust have long been recognized, little is known about the relationship between crustal aging and the properties of oceanic crust.German researchers from the Universities of Hamburg and Bremen explored seafloor created over the last 8 million years at the “super‐fast” spreading East Pacific Rise south of the Garrett Fracture Zone (14–16°S) during a 52‐day marine geophysical survey aboard the R/VSonne. The seafloor in that area spreads at a rate of 150 mm/yr. The researchers studied age‐dependent trends in the structure and properties of upper oceanic crust; this was the first study in nearly two decades to use an integrated approach to study variations and heat transfer in the upper cru
ISSN:0002-8606
DOI:10.1029/96EO00336
年代:1996
数据来源: WILEY
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5. |
Rhapsody in blue |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 50,
1996,
Page 507-507
Michael Carlowicz,
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PDF (1664KB)
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摘要:
Seven years after Voyager 2 flew by Neptune, the planet is coming into focus again. Researchers using the wide field planetary camera on the Hubble Space Telescope have produced new photos and video of the distant planet and again captured images of a large, dark spot in Neptune's Northern Hemisphere. In 1989, Voyager 2 discovered the Great Dark Spot, a pulsating storm the size of Earth in the planet's Southern Hemisphere.Observations made with Hubble in 1994 and 1995 revealed that the southern spot had disappeared, but seemed to be replaced by an equally large spot in the planet's Northern Hemisphere. The new images, taken on August 13, 1996, show that the northern dark spot persists.
ISSN:0002-8606
DOI:10.1029/96EO00337
年代:1996
数据来源: WILEY
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