- 行业: Weather
- Number of terms: 60695
- Number of blossaries: 0
- Company Profile:
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 coordinated global system of meteorological centers and arrangements for the processing, storage, and retrieval of meteorological information within the framework of the World Weather Watch. It includes World Meteorological Centers, Regional Meteorological Centers, and National Meteorological Centers.
Industry:Weather
A heat index that relates the development of plants, insects, and disease organisms to environmental air temperature. Analogous to growing degree-day (GDD), GDH is calculated by subtracting a base temperature from an hourly environmental temperature measurement and values less than zero are set to zero. A summation of hourly GDH is related to development. The temperature threshold (base temperature) below which development either slows or stops is species dependent.
Industry:Weather
The unit of acceleration in the centimeter–gram–second system of units, equal to 1 cm s−2; commonly used in gravimetry.
Industry:Weather
An algorithm to compute rapidly the digital form of the discrete Fourier transform. The procedure requires that the length of the data series undergoing transformation be an integral power of two, which is often achieved by truncating the series or extending it with zeros. More flexible mixed-radix algorithms have been developed that allow data series of any length. They gain efficiency as the prime factors of the length become small, and they are equivalent to the FFT when the data series length is a power of two.
Industry:Weather
A temperature scale with the ice point at 32° and the boiling point of water at 212°. Conversion with the centigrade temperature scale (°C) is accomplished by the formula: °F = (9/5)°C + 32. Compare Celsius temperature scale.
Industry:Weather
A characteristic feature in electric field records directly beneath a thundercloud in which the electric field momentarily reverses polarity during a burst of intense precipitation. The timescale for these events is of the order of minutes. The physical origins of the FEAWP are still unresolved.
Industry:Weather
Vertical coordinate for atmospheric models defined as the potential temperature of the model atmosphere. In practice the isentropic vertical coordinate is replaced by or changed gradually to a terrain- following coordinate near the ground; a change to pressure coordinates near the top of the model atmosphere has also been used. See hybrid vertical coordinate, vertical coordinate system, pressure vertical coordinates.
Industry:Weather
1. A line drawn through geographical points at which a given phase of thunderstorm activity occurred simultaneously. 2. In climatology, a line drawn through geographical points that have the same average number of days with thunder in a given period; a type of isoceraunic line.
Industry:Weather
Within Newtonian mechanics, a reference frame relative to which every point mass not subjected to a net force is unaccelerated. Within relativistic mechanics, a reference frame is inertial in a (local) region of space and time if every point mass in this region remains in uniform motion. According to the principle of relativity, all the laws of physics have the same form (and contain the same numerical constants) when expressed relative to any inertial reference frame.
Industry:Weather
Unintentional changes of clouds due to anthropogenic activities. It has been argued that the release of cloud condensation nuclei worldwide by aircraft, industrial, and agricultural activities may lead to changes of cloud albedo both at cirrus levels and in boundary layer stratus/stratocumulus, thus influencing the earth's radiation balance and overall climate.
Industry:Weather
