- 行业: Weather
- Number of terms: 60695
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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 (usually logarithmic) units for sound pressure measurements. The sound pressure level is equal to 20 (log<sub>10</sub>(''p''/''p''<sub>0</sub>)), in decibels, where ''p'' is the measured acoustical pressure, and ''p''<sub>0</sub> is a reference pressure that must be given explicitly.
Industry:Weather
Techniques for measuring properties of a scattering medium by comparing the signals received at separate antennas or at separate points on the same antenna, or by comparing signals received using two slightly different carrier frequencies. For example, in spatial interferometry the angle of arrival of signals is found by comparing the phases of signals received at two or more separated or spaced antennas. This information, combined with Doppler frequency measurements, can be used to estimate the velocity of the target. In frequency domain interferometry, the phases of signals at two slightly different carrier frequencies are compared to improve the range resolution.
Industry:Weather
That point of any orbit nearest to the center of attraction; the opposite of apocenter. See perigee, perihelion.
Industry:Weather
That part of the inaccuracy of a measuring instrument, or statistical estimate of a parameter, that is due to a single cause or small number of causes having the same sign, and hence, in principle, is correctable; a bias or constant offset from the true value. In the absence of random errors, the true value is equal to the instrumental reading or statistical mean estimate minus the systematic error.
Industry:Weather
Technique used to establish a definite lower bound for probable maximum precipitation by moving an observed depth–area–duration pattern from where it occurred to another place where it may reasonably be expected to occur.
Industry:Weather
That component of the annual cycle of a variable that consists of a sinusoidal oscillation with a period of six months. Strong semiannual signals in thermal and momentum fields of the troposphere are found in both the Tropics (especially in the eastern hemisphere) and in the oceanic regions of Southern Hemisphere middle and high latitudes.
Industry:Weather
That branch of meteorology embracing the propagation of radio waves in the atmosphere and the use of such waves for the remote sensing of clouds, storms, precipitation, turbulence, winds, and various physical properties of the atmosphere. Radio meteorology encompasses radar meteorology.
Industry:Weather
Term derived from ionospheric sounding when the echo from the F-region of the ionosphere becomes blurred, with multiple echoes occurring over a range of distances and frequencies. Spread-F is basically caused by the existence of many small-scale irregularities in electron density within the echoing region, instead of the normal smooth variation of electron density with height.
Industry:Weather
Statements issued by a weather service that discuss weather situations including long-term events that describe phenomena of interest or concern to a number of users. These are used when a warning is in progress to provide additional detail, describe events, and provide appropriate response recommendations. These statements may refer to inclement or hazardous weather, but are not so limited.
Industry:Weather
