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Sea-Level Change (1990) / Chapter Skim
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14 Strategy for Future Measurements of Very-Low-Frequency Sea-Level Change
Pages 221-228

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From page 221...
... Perhaps the current rate of rise is unusually small because we are approaching a climatic optimum; in fact, there is some evidence that the rate of sea-level rise was an order of magnitude larger around 10,000 yr ago. 221 WALTER MUNK, ROGER REVELLE, PETER WORCESTER, and MARK ZUMBERGE Scripps Institution of Oceanography DETECTABILITY OF LONG-TERM TREND There have been many discussions about the long-term 1-mm/yr sea-level rise.
From page 222...
... If the crustal movement could be independently measured, then the global estimates of sea-level rise could be vastly improved. THERMAL EXPANSION VERSUS CHANGES OF OCEAN MASS In considering fluctuations in sea level hats, we distinguish between external processes involving variations in the total mass per unit area and those associated with internal changes in the density distribution (without much altering the total mass)
From page 223...
... The nature of the method used to make absolute gravity measurements makes them well suited to a search for very-low-frequency signals such as those related to sealevel change. In a modern absolute gravity meter, a mass is made to fall freely in a vacuum while its position as a function of time is determined by a laser interferometer.
From page 224...
... 2. A reference pressure could be used with a differential pressure sensor of much lower full-scale pressure than required to directly measure ambient ocean pressure.
From page 225...
... (14.8) TOMOGRAPHY The inverted fathometer method is associated with a steep acoustic path and by its nature depends on a combination of surface elevation and the variable interior field of sound speed.
From page 226...
... An important consideration is that the coefficient of thermal expansion increases appreciably with increasing temperature. Accordingly, most of the changes in Is are associated with the wand ocean water above the thermocline, both because the shallow temperature changes are relatively large and because the coefficient of thermal expansion of the upper ocean waters is relatively large.
From page 227...
... (19841. Precision of vertical position estimates from VLBI, in Proceedings from the Chapman Conference on Vertical Crustal Motion, Harpers Ferry, W


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