- 업종: 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, ...
Analytical separation technique where the minor components in a mixture of gases are separated and resolved into individual components. The technique requires the transmission of the gas sample through a column in the chromatograph using a mobile phase or carrier gas. The column is either packed or coated with a material for which the gases to be separated have an affinity and the strength of this affinity largely determines the time any individual component is retained in the column. Various detectors are employed in gas chromatography, from very specific compound-responsive detectors (flame photometric detector, electron capture detector, photoionization detector, etc. ) to some very generally sensitive detectors (flame ionization detector, thermal conductivity detector, atomic emission detector, etc. ) Gas chromatography is commonly used for the quantification of halocarbons and hydrocarbons in the atmosphere.
Industry:Weather
Any cloudform associated with the foehn, usually referring to standing clouds of two types, orographic clouds and mountain wave clouds. Orographic clouds may include crest clouds and the foehn wall. Wave clouds may consist of lenticular (including altocumulus standing lenticular, or ACSL) clouds, lee-wave clouds and cloud bands, and rotors. See also Bishop wave, chinook arch, contessa di vento, Moazagotl.
Industry:Weather
Analysis of the structure and development of a region in the atmosphere in terms of fronts and air masses.
Industry:Weather
An organized lifting zone of cumulus and towering cumulus clouds, connected to and extending outward from the mature updraft tower of a supercell or strong multicell convective storm. The flanking line often has a stair-step appearance, with the tallest clouds adjacent to the mature updraft tower.
Industry:Weather
An update to a forecast based on predetermined amendment criteria. The criteria are designed to fit a particular forecast, that is, wind speed, temperature, or precipitation.
Industry:Weather
An upward advancing column of high ionization (a streamer or arc) that typically ascends from a point on the earth's surface toward a descending stepped leader. The ground streamer usually joins the stepped leader about 50 m above the ground, after which the upward propagating light and current of the return stroke begin. Ground streamers occur because of the very high electric field intensities that build up directly below the descending, charged stepped leader. Often, more than one ground streamer starts up from the general area under a descending leader, but usually only one makes contact with the leader.
Industry:Weather
An ocean wave is said to be in finite depth if the presence of the sea bed affects it. Generally this depth is taken to be less than one-quarter of the wavelength of the wave.
Industry:Weather
An ocean current flowing along the south coast of northwest Africa into the Gulf of Guinea.
Industry:Weather
An ocean current flowing northwestward along the northern coast of South America (the Guianas). The Guiana Current is an extension of the South Equatorial Current (flowing west across the ocean between the equator and 20°S), which crosses the equator and approaches the coast of South America. Eventually, it is joined by part of the North Equatorial Current and becomes, successively, the Caribbean Current and the Florida Current.
Industry:Weather
An Italian name for the northeast wind. It was given by Roman sailors to the northeast wind in the Gulf of Lions because it came from the direction of the Greek colony of Marsala (Marseilles). Wind names of similar origin are common in the western Mediterranean, for example, gregale.
Industry:Weather
