- 行业: Weather
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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, ...
Any migratory cyclone more or less associated with strong baroclinity of the atmosphere, evidenced on synoptic charts by temperature gradients in the constant-pressure surfaces, vertical wind shear, tilt of pressure troughs with height, and concentration of solenoids in the frontal surface near the ground. Baroclinic disturbances play an important role in atmospheric energy conversion from potential energy to kinetic energy. Compare barotropic disturbance.
Industry:Weather
1. Defined by W. Köppen (1931) as the zone having a definite winter with snow, and a short summer, generally hot. It includes a large part of North America between the Arctic Zone and about 40°N, extending to 35°N in the interior. In Central Europe and in Asia the boreal zone extends southward from the tundra to 40°–50°N. 2. A biogeographical zone or region characterized by a northern type of fauna or flora. The term boreal region is used mainly by American biologists, and includes the area between the mean summer isotherm of 18°C or 64. 4°F (roughly 45°N latitude) and the Arctic Zone.
Industry:Weather
1. Cumulative effects of long-term drying on current fire danger. 2. Increase in strength of a fire management organization. 3. Accelerated spreading of a fire with time. See fire-danger meter.
Industry:Weather
1. As used by W. Köppen in his 1931 climatic classification, the part of the earth's surface that is able to support plant life. It is bounded on the one hand by the cryochore, or region of perpetual snow, and on the other by the xerochore, or waterless desert. Transition zones on either side are the bryochore, or tundra region, and the poëchore, or steppe region. The bulk of the biochore consists of the dendrochore, or treed region. Compare biosphere. 2. In ecology, a group or region of similar plant and/or animal life.
Industry:Weather
1. Any recently formed sea ice that is sufficiently thick to impede navigation. 2. In Labrador, one-year ice that forms in bays and inlets. 3. In the Antarctic, sometimes applied to heavy floes recently broken away from an ice shelf.
Industry:Weather
1. An imaginary surface of irregular shape, inclined toward the lower end of the principal, or trunk, stream of a basin, below which the stream and its tributaries were presumed to be unable to erode. 2. More generally applied to the critical plane of erosion, represented approximately by sea level on coasts, which would be the lowest point toward which running water would usually erode.
Industry:Weather
1. According to general internationally accepted usage, a change in wind direction in a counterclockwise sense (e.g., south to southeast to east) in either hemisphere of the earth; the opposite of veering. 2. According to widespread usage among U. S. Meteorologists, a change in wind direction in a counterclockwise sense in the Northern Hemisphere, clockwise in the Southern Hemisphere; the opposite of veering.
Industry:Weather
1. An agitated zone of water, especially at the surface of a river, spring, or the sea, caused by upward turbulent movement. 2. An upward flow of water in sand caused by pressure imbalances, as when overburden is removed by excavation or when water rises in an adjacent stream channel.
Industry:Weather
1. An accumulation of floating ice fragments less than 2 m across, formed by breakage of other ice forms. 2. In England, a colloquial term for a sudden gust of wind or the sudden onset of a storm.
Industry:Weather
