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1. |
World slope map |
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Eos, Transactions American Geophysical Union,
Volume 67,
Issue 48,
1986,
Page 1353-1362
James G. Moore,
Robert K. Mark,
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摘要:
A colored slope map (scale 1:80,000,000) was generated from digital land and sea floor elevations at 5‐min spacings from data tapes from the National Geophysical Data Center. Slope analysis is facilitated by examining the average slope in 250‐m altitude‐depth intervals both globally and in each of eight tectonic plates. The most striking feature of the map is the multiple parallel bands of steep slope at subduction zones. Submarine volcanic chains produce zones of steep slope that show little degradation at the scale of the map since the Cretaceous. The average slope, or roughness, of spreading ridges decreases exponentially with increasing spreading rate. The passive continental margins generate a steep zone at 1–2 km depth. The lowest average global slope (0.2°) occurs at sea level and reflects the base level that the sea provides for subaerial erosion and the upper limit for marine sedimentation. Slope minima also are caused by the abyssal plains at 4–6 km depth and by glacial ice caps at 3 km
ISSN:0002-8606
DOI:10.1029/EO067i048p01353-01
年代:1986
数据来源: WILEY
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2. |
The GEOSAT Altimeter Mission: A milestone in satellite oceanography |
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Eos, Transactions American Geophysical Union,
Volume 67,
Issue 48,
1986,
Page 1354-1355
Robert Cheney,
Bruce Douglas,
Russell Agreen,
Laury Miller,
Dennis Milbert,
David Porter,
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PDF (1638KB)
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摘要:
In April 1985 the U.S. Navy satellite GEOSAT began generating a remarkable data set that may change the way in which physical oceanographers view the global oceans. GEOSAT (Figure 1) carries a radar altimeter that provides a continuous record of sea level along the satellite ground track. Such records enable determination of sea level variability and have application in many areas of ocean dynamics. Experience with GEOS 3 (Geodynamics Experimental Ocean Satellite 3) and Seasat in the 1970s demonstrated the enormous potential of altimetry for oceanography. Seasat, for example, gathered sufficient altimeter data in its last 25 days alone to yield a global description of the mesoscale eddy field [Cheney et al., 1983], wave number spectra of sea level variability [Fu, 1983], and a global model of theM2tide [Mazzega, 1985].
ISSN:0002-8606
DOI:10.1029/EO067i048p01354
年代:1986
数据来源: WILEY
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3. |
GEOSAT data available soon |
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Eos, Transactions American Geophysical Union,
Volume 67,
Issue 48,
1986,
Page 1355-1355
Robert Cheney,
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PDF (125KB)
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摘要:
GEOSAT altimeter data collected after November 8, 1986, will be made available to the general research community by the National Oceanic and Atmospheric Administration (NOAA) beginning in early 1987. Although GEOSAT has been operating since April 1985, observations from the first 18 months are classified. In October 1986 the satellite was maneuvered into a 17‐day exact repeat orbit whose ground track coincides with the previous Seasat altimeter tracks, allowing new GEOSAT data to be unclassified. Under agreement reached with the U.S. Navy and the Johns Hopkins University Applied Physics Laboratory (Laurel, Md.), NOAA will assume responsibility for generating the unclassified data sets from this Exact Repeat Mission (ERM). Doppler tracking data will first be evaluated by the Naval Astronautics Group (NAG) to ensure that the GEOSAT ground track has deviated by no more than 1 km (cross track) from the exactrepeat orbit. On‐board thrusters will be fired when necessary (approximately monthly) to maintain colinearity. Raw data in, the form of sensor data records (SDRs) will then be transmitted to a NOAA processing facility in Rockville, Md., where they will be converted to finished geophysical data records (GDRs). SDR‐to‐GDR production consists of merging the altimeter data with an ephemeris provided by NAG and adding correctionfields for tides, troposphere (wet and dry components), and ionosphere. Completed GDRs will be sent to NOAA National Environmental Satellite Data and Information Service (NESDIS) in Washington, D.C., where they will be made avilable to the public. (GEOSAT data will initially be distributed to U.S. institutions only; foreign institutions are advised to seek access through formal embassy ch
ISSN:0002-8606
DOI:10.1029/EO067i048p01355-01
年代:1986
数据来源: WILEY
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4. |
Panel recommendations on Oil Spill Risk Assessment |
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Eos, Transactions American Geophysical Union,
Volume 67,
Issue 48,
1986,
Page 1356-1356
George L. Mellor,
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PDF (142KB)
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摘要:
A technical panel was convened by the Minerals Management Services (MMS) of the Department of Interior to identify deficiencies and recommend improvements in their Oil Spill Risk Analysis (OSRA) model. Members of the panel were J. M. Bane, Jr. (University of North Carolina, Chapel Hill), G. S. Janowitz (North Carolina State University, Raleigh), T. H. Lee (University of Miami, Miami, Fla.), G. L. Mellor (Princeton University, Princeton, N.J.), M. L. Spaulding (University of Rhode Island, Kingston), and F. M. Vukovich (Research Triangle Institute, Raleigh‐Durham, N.C.).The present OSRA model uses climatologically derived near‐surface velocity fields on which are superposed oil trajectory velocities derived from the so‐called “3.5% rule”: this uses a wind series derived from a “transition probability matrix” statist
ISSN:0002-8606
DOI:10.1029/EO067i048p01356-01
年代:1986
数据来源: WILEY
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5. |
Bacon‐Bercey Award to Remer |
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Eos, Transactions American Geophysical Union,
Volume 67,
Issue 48,
1986,
Page 1364-1364
Judith A. Katzoff,
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PDF (650KB)
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摘要:
Lorraine A. Remer, a graduate student at the University of California, Davis, is the recipient of the 1986 June Bacon‐Bercey Scholarship for Women in Atmospheric Sciences. The scholarship, administered by AGU, is provided through a gift from June Bacon‐Bercey, a noted meteorolog
ISSN:0002-8606
DOI:10.1029/EO067i048p01364
年代:1986
数据来源: WILEY
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