- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
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The American Meteorological Society promotes the development and dissemination of information and education on the atmospheric and related oceanic and hydrologic sciences and the advancement of their professional applications. Founded in 1919, AMS has a membership of more than 14,000 professionals, ...
The determination of the bearing to the lightning source usually based on the measurement of the horizontal magnetic field with orthogonal coils or loop antennas.
Industry:Weather
The current meter in common use in the United States. Six conical cups, mounted around a vertical axis, rotate and cause a signal in a set of headphones with each rotation. Tail vanes and a heavy weight stabilize the instrument.
Industry:Weather
The datum to which levels on land surveys are related; often defined in terms of a mean sea level. A survey datum is a horizontal surface to within the accuracy of the survey methods.
Industry:Weather
The depth range within the ocean where the speed of sound in seawater takes on a local minimum value. Sound waves generated within this sound channel or waveguide will, through continual refraction in the vertical due to temperature effects above and pressure effects below, remain within it. These sounds can propagate large horizontal distances within this waveguide with relatively little loss in amplitude.
Industry:Weather
The complex motion imparted to a ship upon encountering waves. All the motions can be regarded as combinations of three oscillations about horizontal or vertical axes (roll, pitch, and yaw), and three linear displacements of the center of gravity (heave, surge, and sway).
Industry:Weather
The derivative of any vector in any spatial direction. The particular direction should be clear from the context.
Industry:Weather
The complete set of stress components in a medium, which are written as a tensor τ''<sub>ij</sub>''. It has nine components, one for each of the coordinate faces of an imaginary fluid element upon which the stress acts (''j'' = ''x'', ''y'', ''z'') and for each direction in which the stress is directed (''i'' = ''x'', ''y'', ''z'') By definition, an inviscid fluid is one in which the six tangential stresses (''i'' ≠ ''j'') are zero, and the three normal stresses (''i'' =''j'') are equal to the negative of the pressure.
Industry:Weather
The current at the sea surface, which is partly due to the effects of wind and waves. Empirically, it is found that the drift current at the surface is 2. 5%–3. 0% of the wind speed, and it decreases rapidly in the uppermost meter.
Industry:Weather
