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1. |
SAMA: For how long? |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 2,
1989,
Page 17-17
O. Pinto,
W. D. Gonzalez,
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摘要:
The South Atlantic Magnetic Anomaly (SAMA) has been studied since the beginning of the sixties. This region of low field intensity in the South Adantic near Brazil is known to have important consequences in radiationbelt physics “e.g., Pinto and Gonzalez, 1986”. This feature of the field can be explained by the concept of an eccentric dipole. This concept, specified by the dipole and quadrupole terms of the multipole expansion of the geomagnetic field, account for about 90% of the surface field “Parkinson,
ISSN:0002-8606
DOI:10.1029/89EO00006
年代:1989
数据来源: WILEY
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2. |
Report on SEQUAL/FOCAL |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 2,
1989,
Page 18-23
E. J. Katz,
S. G. H. Philander,
P. L. Richardson,
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摘要:
In Eos (April 6, 1982), United States plans for a program to study the dynamic response of the equatorial Atlantic to seasonally varying surface winds were described. Now, 6 years later, we report on progress toward our goal “to describe accurately, and to model correctly” the changes in the currents and density field of the upper equatorial Atlantic Ocean during a 2‐year period. A major effort toward this goal was the field phase of SEQUAL (Seasonal Response of the Equatorial Atlantic) and the closely coordinated French program FOCAL (Français Océan et Climat dans l'Atlantique Equatorial).Between February 1983 and September 1984 changes in the surface winds and in oceanic conditions in the equatorial Atlantic were monitored continuously with a variety of instruments. Figure 1 shows key deployments and sections. The resulting data include six current meter moorings, 15 inverted echo sounders and island tide gauges, 57 near‐surface drifters, and 18 French and five U.S. cruises that made 1200 hydrographic stations and 800 current profiles. All these data, as well as nearly 10,000 expendable bathythermographs (XBTs) (from the cruises, from air‐dropped expendable bathythermograph (AXBT) programs, and from repeated ship of opportunity lines run between 1980 and 1985) were combined and documented by George Heimerdinger, of the National Oceanographic Data Center, and are available from NODC
ISSN:0002-8606
DOI:10.1029/89EO00009
年代:1989
数据来源: WILEY
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3. |
Geosat data give wind speed and wave height |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 2,
1989,
Page 23-29
Ella B. Dobson,
John Wilkerson,
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PDF (304KB)
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摘要:
The Navy has released Geosat radar cross section and significant wave height data from the 18‐month Geodetic Mission for use by the general public. These data, when combined with data from the Exact Repeat Mission, comprise the most dense global wind speed and wave height data set ever archived. The accuracy of the data when compared with NDBC buoys has been shown [Dobson et al., 1987] to be +/− 1.7 m/s for wind speed and +/− 0.5 m for wave height.The Geosat altimeter orbits the Earth at an altitude of 800 km and, during the Geodetic Mission, laid down a ground track which precessed about 100 km every 3 days forming a tight mesh over 72 days which was repeated for three consecutive 72‐day periods. The primary mission of the instrument was to measure the marine geoid, but it also measured radar cross section (RCS) and significant wave height (SWH). RCS is the return signal backscattered from the ocean surface and is proportional to wind speed. SWH is obtained from the slope of radar‐returned pulse. Data are available at a one per second rate with complete global
ISSN:0002-8606
DOI:10.1029/89EO00010
年代:1989
数据来源: WILEY
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4. |
SCOR activities |
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Eos, Transactions American Geophysical Union,
Volume 70,
Issue 2,
1989,
Page 29-30
S. Krishaswami,
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PDF (174KB)
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摘要:
In August 1982 the Scientific Committee on Oceanic Research (SCOR) constituted a working group (WG‐71) on “Particulate Biogeochemical Processes.” This working grouphad the following terms of reference:To delineate the principal particulate transport processes which control trace element and nutrient element distribution in the open ocean.To clarify the definition of terms and processes used to describe particulate material in the ocean and to suggest the most appropriate methodology for the study of the material defined above.To ascertain the possibility of determining particulate fluxes of elements and organic matter to different depths in the sea.To prepare a state‐of‐the‐art report on the particulat
ISSN:0002-8606
DOI:10.1029/89EO00011
年代:1989
数据来源: WILEY
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