- 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 line of constant potential temperature on a thermodynamic diagram.
In terms of pressure ''p'', and specific volume α, the equation for a dry adiabat may be written
<center>[[File:ams2001glos-De49.gif
Industry:Weather
The frictional impedance offered by air to the motion of bodies passing through it. More precisely, the component of aerodynamic force parallel to the direction of mean flow.
At very low speeds, most of the drag exerted by the air on a body moving through it is due to viscous drag (or skin friction) acting through a fairly thin boundary layer. In the case of spheres, the low-speed air resistance is given by Stokes's law. For higher speeds, so-called form drag or pressure drag arises as a result of separation of the laminar boundary layer creating a wake region of chaotic flow in which the pressure is reduced. In general, for large Reynolds numbers, form drag is far more significant than viscous drag. The velocity dependence of air resistance changes more or less continuously from linear dependence in the viscous range to velocity-squared dependence at high speeds. The latter dependence is given by Rayleigh's formula,
<center>[[File:ams2001glos-De45.gif
Industry:Weather
A dimensionless ratio of the component of force parallel to the direction of flow (drag) exerted on a body by a fluid to the kinetic energy of the fluid multiplied by a characteristic surface area of the body.
In symbols, the drag coefficient ''C<sub>D</sub>'' is
<center>[[File:ams2001glos-De46.gif
Industry:Weather
Form on which meteorological observations are recorded daily to produce a monthly summary.
Industry:Weather
Lowest temperature recorded during a particular calendar month in a specified year.
Industry:Weather
Le bruit entendu par le biais de l'orateur suivi d'une radiosonde modulés audio quand le signal audio est devenu si faible fréquence qu'il ressemblait le bruit d'un bateau à moteur. Il a correspondu à des humidités basses non mesurables. Sondes modernes n'ont de telles limitations strictes ou produire un tel signal.
Industry:Weather
Une période d'expansion générale des glaciers diversement définie comme allant d'il y a environ 3000 à 2000 ans ou pour les dernières années de 4000–5000.
Industry:Weather
Les éléments hélium (il), néon (Ne), argon (Ar), krypton (Kr), xénon (Xe) et le radon (Rn) qui composent la huitième période du tableau périodique. En raison de leurs orbitales atomiques entièrement remplis, ces gaz est extrêmement non réactif et s'accumuler à des concentrations mesurables dans l'atmosphère.
Industry:Weather
