- 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, ...
A dipole eddy structure of counterrotating flows, such as neighboring cyclonic and anticyclonic vortices that propagate through the mean flow together.
Industry:Weather
Flow across a measuring device in which the water level upstream is not influenced by the downstream water level.
Industry:Weather
1. In general, the modification of some property of a phenomenon by another distinct phenomenon. 2. In radio, radar, sodar, and lidar, the modification of the amplitude, phase, or frequency of a carrier to convey information or to permit resolved measurements at particular range, frequency, or velocity intervals.
Industry:Weather
Any theoretical representation of the atmosphere, particularly of vertical temperature distribution. See adiabatic atmosphere, homogeneous atmosphere, isothermal atmosphere, thermotropic model, equivalent barotropic model, barotropic model, standard atmosphere.
Industry:Weather
Adjustment of the parameters of a mathematical or numerical model in order to optimize the agreement between observed data and the model's predictions.
Industry:Weather
For a numerical weather prediction model, statistical relations between model-forecast variables and observed weather variables, used for either correction of model-forecast variables or prediction of variables not explicitly forecast by the model. They have often taken the form of multilinear regression equations derived by screening potential model-forecast variables as predictors. The method produces forecasts of weather variables that to some extent account for the random and systematic errors in the numerical weather prediction model. Compare perfect prognosis method.
Industry:Weather
A tool for simulating or predicting the behavior of a dynamical system like the atmosphere. Models can be based on subjective heuristic methods, statistics (see statistical dynamical model, model output statistics), numerical methods (see numerical forecasting), simplified physical systems (see dishpan experiments), analogy (see analogs), etc. The term is now most commonly applied to numerical models.
Industry:Weather
An approximation that treats the atmospheric boundary layer as though variables such as potential temperature, momentum, pollutants, and humidity were uniform with height. This type of model is popular because of its simplicity, requiring forecasts of only the average variables in the mixed layer and of the change of mixed-layer depth. During sunny days over land, the actual boundary layer is often sufficiently well mixed that a uniform slab approximation is a fairly good approximation.
Industry:Weather
In oceanography, densely packed, irregularly oval- shaped high and low pressure centers roughly 400 km (240 miles) in diameter in which current intensities are typically tenfold greater than the local means.
Industry:Weather
A locally bright spot of light in the sky other than the sun itself. As such, it is usually applied to a parhelion, but has also been used for other spots such as paranthelia.
Industry:Weather
