- 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, ...
Family of organic carbonyl compounds of general formula RC(O)R, where the R represents alkyl groups (not necessarily the same). Ketones are formed in the oxidation of most of the larger hydrocarbons. Their main atmospheric fate is reaction with hydroxyl radicals or photolysis in the near UV.
Industry:Weather
Differential equations that determine the evolution of a general dynamical system. These are derived using the calculus of variations to minimize the Lagrangian functional equivalent to the time integral of the difference between the kinetic and potential energies with respect to variations in the evolution of the system.
Industry:Weather
Computer codes that numerically integrate in three dimensions the time-dependent Navier–Stokes equations filtered over a grid volume much smaller than the size of the energy-containing eddies or wavelengths of turbulence. The solutions of these models consist of energy-containing large eddies that carry most of the turbulent fluxes. The net effect of small subgrid-scale eddies is treated as locally diffusive and dissipative, typically modeled based on inertial-subrange theory.
Industry:Weather
Deadly mixture of smoke and fog peaking in the midtwentieth century in large cities. A smog episode in London in 1952 led to 4000 deaths. The sulfuric acid produced from the fossil fuel sources in use at that time led to a choking mixture when incorporated into fog droplets. It is associated with low temperatures, low actinic flux, and high humidity. This form of air pollution was largely eliminated by legislation in the 1950s that led to reduced emissions of SO2 and smoke. See Los Angeles (photochemical) smog.
Industry:Weather
Confined to first-degree algebraic terms in the relevant variables. For example, a + bx + cy is linear in x and y; a sin x + b cos y is linear in the coefficients a and b, but nonlinear in x and y.
Industry:Weather
Cirrus specifically associated with vertical motion with respect to the jet stream, which gives a visual indication of the existence and direction of the jet stream across the sky.
Industry:Weather
Avogadro's number per unit liter, that is, 2. 687 x 1022 per liter.
Industry:Weather
Any part of the earth's seasonal or perennial ice cover that has formed over land as the result, principally, of the freezing of precipitation; opposed to sea ice formed by the freezing of seawater. Thus, an iceberg or tabular iceberg is land ice as well as its parent glacier, ice sheet, or ice shelf. The two major concentrations of land ice are the ice sheets of Greenland and Antarctica. Glaciers and ice caps are the other important forms.
Industry:Weather
Atmospheric conditions above the level of free convection when the lapse rate is steeper than moist adiabatic; has been used more as a quantitative measure than a qualitative condition. It is becoming an obsolete term, replaced qualitatively by conditional instability and quantitatively by convective available potential energy.
Industry:Weather
An upper-air observation by means of instruments carried aloft by a kite. See kytoon.
Industry:Weather
