Advection is the transport of a conserved scalar quantity that is transported in a vector field. A good example to have in mind would be the transport of pollutants or even silt in a river: the motion of the water carries these impurities downstream (see pigpen problem). Anything is a impurity in this context which is having different density from that of basic flow. The term scalar is used in mathematics, physics, and computing basically for quantities that are characterized by a single numeric value and/or do not involve the concept of direction. ... Vector field given by vectors of the form (-y, x) In mathematics a vector field is a construction in vector calculus which associates a vector to every point in a Euclidean space. ...

In meteorology and physical oceanography, advection usually refers to the predominantly horizontal transport of an atmospheric property or oceanic fluid by the wind, e.g. moisture or heat advection. In this context, the advection operator (in z and p vertical coordinates) is Satellite image of Hurricane Hugo with a polar low visible at the top of the image. ... World Oceans Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of the ocean. ... Horizontal is an orientation relating to, or in parallel with the horizon, and thus perpendicular to the vertical. ... Layers of Atmosphere (NOAA) Earths atmosphere is a layer of gases surrounding the planet Earth and retained by the Earths gravity. ... [[Image:http://www. ... A subset of the phases of matter, fluids include liquids, gases, plasmas and, to some extent, plastic solids. ... Wind is the roughly horizontal movement of air (as opposed to an air current) caused by uneven heating of the Earths surface. ... Italic textiuerutrtweklugygoig{| align=right border=1 cellspacing=0 cellpadding=3 style=margin: 0 0 0 0. ... In physics, heat is defined as energy in transit. ...

.

See also advection equation. The advection equation is the partial differential equation that governs the motion of a conserved scalar as it is advected by a known velocity field. ...