Depth Diversity Gradient: The increase in species richness with increasing water depth until about 2000 meters below the surface, where species richness begins to decline.

 

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Depth Diversity Gradient: The increase in species richness with increasing water depth until about 2000 meters below the surface, where species richness begins to decline.

Gradient Flow: A solution of the relative hydrodynamic equations of motion in which only the horizontal Coriolis, pressure gradient, and centrifugal forces are considered.

Gradient Wind: A steady horizontal air motion along curved parallel isobars or contours in an unchanging pressure or contour field, assuming there is no friction and no divergence or convergence.

Geothermal Gradient: The progressive increase of temperature with depth into the Earth.

Genetic Diversity: The genetic variation that occurs within a population or species. For example, there are several different colour dog whelk shells and ochre sea stars. See also biodiversity; compare ecosyst . . . View Full Definition

Diversity Tuner: An FM tuning method which employs two antennas. The tuner can switch between the two antennas in order to attain better reception.

Ecosystem Diversity: The diversity of biological communities and their physical environment. Diversity is determined by the species composition, physical structure and processes within an ecosystem. This is the . . . View Full Definition

Frequency Diversity: Frequency diversity refers to the use of complementary radar transmissions or multiple radar systems operating cooperatively at different frequencies.

Horizontal Pressure Gradient Force: The horizontal component of the product of the specific volume and the rate of decrease in pressure with distance.

Illusion Of Depth: The ability of the two-dimensional television image to create an illusion whereby space seems to recede into the image. A telephoto lens creates a small illusion of depth and a wide-angle le . . . View Full Definition