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Examining several Southern Ocean data sets |
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Eos, Transactions American Geophysical Union,
Volume 72,
Issue 33,
1991,
Page 345-351
Charles R. McClain,
Chester J. Koblinsky,
James Firestone,
Michael Darzi,
Eueng‐nan Yeh,
Brian D. Beckley,
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摘要:
The Southern Hemisphere ocean covers approximately 45% of the Earth's surface and poses a major scientific challenge to initiatives such as the World Ocean Circulation Experiment (WOCE) and the Joint Global Ocean Flux Study (JGOFS) programs, whose goals include elucidation of its deep circulation and its contributions to global bio‐geochemical budgets. The Southern Ocean is generally regarded as the region south of about 30°S and, in many respects, is quite different from its northern counterpart. Unlike the oceanic and atmospheric flows in the Northern Hemisphere, the Circumpolar Current “Nowlin and Klinck, 1986” and surface winds have relatively unobstructed circulations around Antarctica that allow the exchange of water between basins and result in the most intense wind forcing in the global ocean.An analysis of the annual cycle of sea level using Geosat altimetry has shown that seasonal changes in the surface ocean circulation are much weaker in the Southern Hemisphere than in the Northern Hemisphere. Also, comparison of the pigment fields obtained from the Nimbus‐7/Coastal Zone Color Scanner (CZCS) indicates that the biology of the northern and southern oceans is quite different in that the northern oceans exhibit a pronounced spring bloom, while the Southern Ocean is relatively constant the year round “Esaias et al., 1986;Feldman et al.1989”. The cause of this dissimilarity is a topic of some debate, with various arguments focusing on differences in trace nutrient supply, physical forcing, and
ISSN:0002-8606
DOI:10.1029/90EO00270
年代:1991
数据来源: WILEY
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2. |
FY92 Appropriations Bills reach conference committees |
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Eos, Transactions American Geophysical Union,
Volume 72,
Issue 33,
1991,
Page 346-346
Susan Bush,
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摘要:
Further legislative action will be put on hold until after Labor Day, while Congress is in its annual August recess. The FY 92 budget cycle begun in February is in its closing stages. Differing appropriations bills funding the science agencies were passed by both chambers of Congress and must now be passed by a joint committee conference, specially appointed to iron out the differences in the bills before going to President Bush for his approval or veto.The Energy and Water Development appropriations bill (HR2427), which funds the Department of Energy, has gone through the joint conference committee and has been sent to the president. In less than 2 hours of negotiation the House and Senate agreed to the final version of the bill on July 30. The House voted in favor of the measure the next day, and the Senate approved it on August 2 by voice vote.
ISSN:0002-8606
DOI:10.1029/90EO00267
年代:1991
数据来源: WILEY
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3. |
Extent of Pinatubo cloud probed |
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Eos, Transactions American Geophysical Union,
Volume 72,
Issue 33,
1991,
Page 347-347
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摘要:
The major stratospheric aerosol cloud produced by the mid‐June eruption of Pinatubo in the Philippines circled the globe in about 3 weeks, forming a semi‐continuous band between roughly 20°N and 20°S. Preliminary data continue to suggest that the cloud was larger than that injected by the 1982 eruption of El Chichon. The cloud's dispersal and structure were tracked by satellites and monitored by airborne and ground‐based instruments. The bulk of the cloud remained at equatorial latitudes, but work thus far may not have investigated its densest
ISSN:0002-8606
DOI:10.1029/EO072i033p00347-03
年代:1991
数据来源: WILEY
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4. |
U.S.S.R. magnetic anomaly data |
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Eos, Transactions American Geophysical Union,
Volume 72,
Issue 33,
1991,
Page 348-348
Anonymous,
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PDF (156KB)
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摘要:
U.S.S.R. magnetic anomaly data are now available from the National Geophysical Data Center. The data set contains a wealth of information useful to Earth scientists studying global tectonic processes and the deep crustal composition of major continental eratons.In 1974 the Ministry of Geology of the U.S.S.R. published a mosaic series of 18 sheets at 1:2,500,000 scale showing the residual magnetic intensity over the land mass of the U.S.S.R. The data were compiled by a group of scientists under the leadership of Z.A. Makarova. Much of the source material originated from data collected between 1949–1962, during which time the territory of the U.S.S.R. was surveyed using aerial magnetic survey techniques. These surveys were adjusted based on many methods including secular variation linked to magnetic observations. Anomalies were computed with reference to a normal field map for 1964–1965 constructed from equally accurate total field measurements along control network str
ISSN:0002-8606
DOI:10.1029/EO072i033p00348-01
年代:1991
数据来源: WILEY
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