- المجال: Education
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Founded in 1876, Texas A&M University is a U.S. public and comprehensive university offering a wide variety of academic programs far beyond its original label of agricultural and mechanical trainings. It is one of the few institutions holding triple federal designations as a land-, sea- and ...
An artifact of attempting to approximate a function or waveformwith a discontinuity using a Fourier series or some other global, continuous basis function. The fit is poor in a region near the discontinuity, usually characterized by large oscillations within the region. Increasing the number of components in the approximation decreases the region of poor fit, which theoretically vanishes with an infinite number of components.
Industry:Earth science
An artifact of numerical solution procedures that use a centered scheme for temporal advancement, i.e. one that requires information at three time levels. Starting such a scheme requires two independent initial conditions, one specified and the other calculated from this using a temporal scheme requiring only two time levels. This results in a solution that is actually the sum of two solutions, one related to the actual physics of the problem and the other purely an artifact of the numerical procedure. The numerical solution usually alternates at each time step, resembling a sawtooth wave over time, and can be damped by averaging the solution over two consecutive time steps at suitably chosen intervals.
Industry:Earth science
An assembly of instruments designed to count and measure particles and to determine optical and environmental properties of water as a function of depth. The main part of the POPS system is the Large Aggregate Profiling System (LAPS) package used to measure particles ranging from 250 microns to several millimeters in diameter. It also usually carries an LISST which measures smaller particles ranging from one to 250 microns in diameter. Other instruments found on POPS include a CTD, a transmissometer (for measuring particles less than 20 microns in diameter), a fluorometer and an a-c meter (for measuring chlorophyll), LSS (for measuring particle abundance).
Industry:Earth science
An association of institutions which have active research interests in the Gulf of Maine and its watershed. It was founded in 1991 and is housed at Dartmouth College. The missions of the association are to advocate and facilitate a coherent program of regional research, to promote scientific quality, and to provide a communication vehicle among scientists and the public.
Industry:Earth science
An atmospheric convergence zone in the southwestern Pacific Ocean that is characterized more by a convergence in wind direction than as a wind speed minimum. It extends from east of Papua New Guinea in a southeastward direction towards 120° E and 30° S.
Industry:Earth science
An atmospheric pressure distribution in which there is a low central pressure relative to the surroundings. The circulation around the center is anticlockwise (clockwise) in the northern (southern) hemisphere.
Industry:Earth science
An atmospheric scientist (1905–1986) who published many basic contributions to the study of short–period atmospheric wave motions, planetary waves (including atmospheric tides), and vortex motions in tropical cyclones. He also published on atmospheric radiation, the wave structure of noctilucent clouds, and internal tides in the oceans.
Industry:Earth science
An atmospheric state in which the temperature gradients are such that the isotherms are parallel to the isobars.
Industry:Earth science
An automated system for collecting sea level and other data. The NGWLMS platform measures sea level position, air and water temperature, water density, wind speed and direction, and atmospheric pressure. Data is collected at various rates, stored every three minutes, and relayed via the NOAA GOES satellite to a central collection facility in Rockville, MD every three hours.
Industry:Earth science
An easterly wind in the Straits of Gibraltar, most frequent from July to October and in March. It is usually associated with high pressure over western Europe and low pressure to the southwest of Gibraltar over the Atlantic or to the south over Morocco.
Industry:Earth science
