1. |
“Concrete” Testimony to Milankovitch Cycle in Earth's changing obliquity |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 44,
1996,
Page 433-433
Benjamin Fong Chao,
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摘要:
The present‐day obliquity of the ecliptic of the Earth is ϵ = 23°26′ 22″ and is decreasing by about 0″.5 a year. This article reports a “concrete” terrestrial testimony to this time variation, which plays a major part in the Milankovitch cycles.The obliquity is the angle between the equatorial plane, which is determined by Earth's rotation, and the ecliptic plane, defined as Earth's orbital plane around the Sun. It gives rise to the seasons; the two parallels of latitudee, the Tropic of Cancer in the Northern Hemisphere and the Tropic of Capricorn in the Southern Hemisphere, mark the limits of highest latitudes that the subsolar point reaches at solsti
ISSN:0002-8606
DOI:10.1029/96EO00291
年代:1996
数据来源: WILEY
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2. |
A Practical Guide to Groundwater and Solute Transport Modeling |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 44,
1996,
Page 434-434
John C. Tracy,
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摘要:
Discussing a book's appendices is a somewhat odd way to begin a book review. However, Appendix A inA Practical Guide to Groundwater and Solute Transport Modelingby Spitz and Moreno provides not only a concise overview of the steps involved in a groundwater modeling study, but also a good starting point to discuss why this text would be a valuable addition to a groundwater modeler's library. The general approach to modeling that Spitz and Moreno take can be found in many groundwater modeling books. However, one rarely finds a text that covers each step in the modeling process as well as this one does. This is especially true in three areas: the selection of model input data, the calibration of a model, and the development of model summaries.
ISSN:0002-8606
DOI:10.1029/96EO00293
年代:1996
数据来源: WILEY
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3. |
Panels developing position statements |
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Eos, Transactions American Geophysical Union,
Volume 77,
Issue 44,
1996,
Page 435-435
Anonymous,
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PDF (167KB)
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摘要:
Two AGU advocacy panels—one focusing on natural hazards and one on data issues—are working to develop and recommend position statements for adoption by the Union's Council. Operating under the Union's advocacy guidelines, the finished statements will be forwarded to the Council for comment and then a vote. Concurrence of two‐thirds is required for adoption.The Union adopts positions of advocacy on geophysical science issues based on their intrinsic merits and needs. As a scientific society, AGU does not take or advocate public positions on issues extending beyond the range of available geophysical data or recognized norms of legitimate scientific debate. Public positions adopted by AGU and statements on its behalf must be based on sound scientific issues and must reflect the interests of the Union as a
ISSN:0002-8606
DOI:10.1029/96EO00294
年代:1996
数据来源: WILEY
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