Satellite Gravity and the Geosphere Contributions to the Study of the Solid Earth and Its Fluid Envelopes (1997) / Chapter Skim
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1 INTRODUCTION
1 INTRODUCTION
Pages 7-14
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From page 7... ...
Spaceborne gravity measurements have already led to dramatic advances in recent years in the understanding of the structure and dynamics of the core and mantle, the thermal and mechanical structure 7 of the lithosphere, ocean circulation, and plate tectonics. The substantial improvements in the accuracy of static field measurements that would result from He satellite gravity missions we discuss in this report would allow geophysically important smaller-scale features to be resolved and, by improving the geodetic reference frame, would greatly enhance other types of satellite measurements as well.
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From page 8... ...
t) s~E C~ /~<'-D TH~ = Spatial!
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From page 9... ...
100 FIGURE 1.2 (Above) This figure indicates some of the expected sources of variability in the Earth's gravity field that would appear to vary linearly in time over a few years of observations.
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The time V~21iO~ sbo~ ~ He mass involved in ~ periodic Equal or di~alT mot) -, or the mass Blob Cows during ~ decade (secular molion)
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From page 11... ...
Precise knowledge of the atmospheric surface pressure uncertainty on seasonal, annual, and secular time scales becomes increasingly important as gravity measurements become increasingly accurate. There are a few areas, such as parts of the Southern Hemisphere, where the atmospheric pressure errors may be larger than the uncertainties in the hydrological estimates.
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From page 12... ...
. ~unospnencp~ssureuala 199S Comprehensive solutioninco~or~ing altimetry, ~ ~cepTsvime~y,and GPS ~ackingtJointOravi~ hiodel[JG\43]
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From page 13... ...
The development of compact, highly accurate accelerometers and "radiometers eliminates the need for the expensive "drag-free" system included in many of the earlier gravity-mission designs. In all of the current gravity-mission proposals, modern, highly capable, compact GPS flight receivers will provide access to the rich information content of the dualfrequency navigation signals of the GPS constellation.
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From page 14... ...
T~ ~S ~d ~C I, ~ ~,~- ~ ~ i' I.~.'t ~W M for .~.~pmvIn~ ~e ~l ~:W Celd =d eXplom scientific guest:~ns ~ could be akessed wi~ be~er ~ r .~ d~ T~ ~ I, < ~ ~ 1~:~ hOWC~r~: ~,~7 53~e 60~n J~6 exten~ 5~\r0~\Y i~ ~0 itt0~0 (tA=~- ~ ~6 000~{ ]
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