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is the free-air gravity anomaly. is the Bouguer correction which allows for the gravitational attraction of rocks between the measurement point and sea level; is a terrain correction which allows for deviations of the surface from an infinite horizontal plane
The free-air correction adjusts measurements of gravity to what would have been measured at mean sea level, that is, on the geoid. The gravitational attraction of Earth below the measurement point and above mean sea level is ignored and it is imagined that the observed gravity is measured in air, hence the name.
It is the setting that causes an altimeter to read the aircraft's flight level (FL). Flight levels are given in hundreds of feet (for example: FL100 = 10 000 ft). Atmospheric pressure changes over time and position. Thus, the flight level is not "straight", because it has a different altitude (elevation above the mean sea level).
The largest absolute deviation can be found in the Indian Ocean Geoid Low, 106 meters below the average sea level. [18] Another large feature is the North Atlantic Geoid High (or North Atlantic Geoid Swell), caused in part by the weight of ice cover over North America and northern Europe in the Late Cenozoic Ice Age .
For example, if a barometer located at sea level and under fair weather conditions is moved to an altitude of 1,000 feet (305 m), about 1 inch of mercury (~35 hPa) must be added on to the reading. The barometer readings at the two locations should be the same if there are negligible changes in time, horizontal distance, and temperature.
The tools demonstrate how much sea levels could rise if changes are or are not made in carbon pollution levels. If changes aren't made, Ben Strauss, CEO and chief scientist of Climate Central, a ...
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