- 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 polariscope consisting of a specially constructed double plate polarizer and a tourmaline plate analyzer. Polarized light passing through the instrument is indicated by the presence of parallel colored fringes, while unpolarized light results in a uniform field. See Voss polariscope.
Industry:Weather
A pollution control device for reducing (scrubbing) sulfur dioxide (SO<sub>2</sub>) emissions. This device consists of a column or tower that is packed with absorption material such as sodium or calcium carbonate, which removes the SO<sub><sub>2</sub></sub> from the flue gas as it passes through the tower.
Industry:Weather
A polarimeter operating at optical wavelengths, especially in the band of wavelengths visible to the human eye.
Industry:Weather
A point on a thermodynamic diagram representing the state of the air defined by a pair of variables: ''P<sub>sat</sub>'' and ''T<sub>sat</sub>'', where ''P<sub>sat</sub>'' is the saturation pressure and ''T<sub>sat</sub>'' is the saturation temperature. These latter variables are the pressure and temperature of an air parcel that was raised dry- adiabatically or lowered moist-adiabatically until it was just at saturation. The saturation point is a conserved variable for adiabatic motion and thus serves as a tracer for the air parcel on a thermodynamic diagram.
Industry:Weather
A pointed device that indicates the amount of resistance encountered when it is forced into a material such as snow or soil. See ram penetrometer.
Industry:Weather
A plot of amplitude or squared amplitude against frequency for the wave components of a periodic function represented by a Fourier series.
Industry:Weather
A picture element, that is, a single element of an image or picture. A pixel is the smallest element of a picture. Other elements are rows, columns, and subframes, which are rectangular regions of the image or picture.
Industry:Weather
A plant that habitually obtains its water supply either directly from the zone of saturation or through the capillary fringe. Salt cedar, mesquite, greasewood, sycamore, willow, and cottonwood are examples.
Industry:Weather
A physically motivated numerical technique for solving the advection (transport) equation. In the advective form, ''DQ''/''Dt'' = 0, where ''D''( )/''Dt'' is the total derivative, and “mixing ratio” ''Q'' is an invariant along a flow trajectory. By tracing (along the flow trajectory) backward in time to the “departure point”, the value at the “arrival point” can be obtained by an interpolation or a remapping procedure (between the fixed Eulerian grid and a time-dependent distorted Lagrangian grid). Because of the discrete particle–like approach, total mass is generally not conserved. To ensure mass conservation, the semi-Lagrangian method can be formulated with the conservative flux form. The singular particle discretization is replaced by a finite control-volume discretization. Analogous to an Eulerian flux-form formulation, total flux from the upstream direction, computed in the Lagrangian fashion, is used for the prediction of the volume-averaged quantity, which can be the density or a density-weighted mixing ratio–like quantity. Because the size of the time step is not limited by the CFL condition, both the advective-form and the flux-form semi-Lagrangian methods are computationally efficient, particularly in spherical geometry.
Industry:Weather
