- 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, ...
An area of high pressure that forms over Siberia in winter and that is particularly apparent on mean charts of sea level pressure. Its center is near Lake Baikal, where the average sea level pressure exceeds 1030 mb from late November to early March. This anticyclone is enhanced by the surrounding mountains that prevent the cold air from flowing away readily. In the center of the anticyclone the normal clockwise circulation is replaced by katabatic winds down the river valleys, but to the east along the Pacific Coast there is a belt of very strong northerly winds. The offshore flow is known as the winter monsoon. In summer the Siberian high is replaced by a low pressure area.
Industry:Weather
A nondimensional number arising in problems of a rotating viscous fluid. It may appear either as Ω''h''<sup>2</sup>/ν, in which case it equals one-half the square root of the Taylor number, or as Ω''r''<sup>2</sup>/ν, where ''r'' is a suitable radius, ''h'' a representative depth, Ω the absolute angular speed, and ν the kinematic viscosity.
Industry:Weather
Same as x-ray; rarely used these days. X-ray was the coinage of Wilhelm Röntgen, who discovered them.
Industry:Weather
Aviation weather communications code word for radar report. See radar meteorological observation.
Industry:Weather
A chain of fusion reactions the net effect of which is that four protons yield a helium nucleus. This chain accounts for about 99% of the energy conversion that keeps the sun at its high temperature. We owe our existence to the proton–proton chain, the source of the sun's energy.
Industry:Weather
A pressure anemometer consisting of two concentric tubes that are oriented parallel to the flow. The inner tube is open at the upstream end to sense the total pressure, while the outer tube is closed with a rounded contour and has a ring of small static pressure ports a short distance downstream. Each tube is connected to a manometer and the difference between the two pressures, the dynamic pressure, is proportional to the square of the fluid speed.
Industry:Weather
The nearly permanent subtropical high of the North Pacific Ocean centered, in the mean, at 30°–40°N and 140°–150°W. On mean charts of sea level pressure, this high is a principal center of action.
Industry:Weather
The aviation communications code word and commonly used contraction for pilot report.
Industry:Weather
