Winds are blowing from a region of warm air to a region of colder air, which results in a warming of the colder region. As the warm advection persists, temperatures in the colder region will begin to increase as the warmer air moves into the region of colder air. Animation by: Van Dorn The net result of warm advection is to make a region warmer. Heat advection. The thick solid lines are 1, hPa height contours m. The geostrophic wind which is shown by arrows blows along these contours, and the real wind near the surface is close to the 1, hPa geostrophic wind.
The length of the arrows is a measure of the wind speed. Blue shading indicates cold advection, red shading is warm advection. A cold front extends from a low towards the north. The density of the shading is proportional to the amount of advection, i. Very little heat advection occurs at low latitudes on account of the very weak temperature gradients there.
Imagine the water in a pan that is over the heat: As the bottom of the pan heats up, this heat is transferred by conduction to the water at the bottom of the pan. The water then heats up, causing its molecules to vibrate more and the overall density of this part of the water to decrease due to the increased motion of the molecules. The reduction in density causes the warmer portion of water to rise, being replaced by cooler, denser water from the upper part of the pan.
As the hotter water rises, it loses some of its additional energy being transferred to other parts of the water as well as being lost as a result of the motion , causing it to cool and become denser.
At the same time, the cooler water that replaced it at the bottom of the pan has now heated up, become less dense and started to rise. The process starts over again, resulting in convection currents throughout the pan. This same process also occurs in the atmosphere, in the air near a heater, and in many other places where there is a distinct source of heat.
Advection is a more specific process, defined as the transport of something such as temperature, moisture or a substance from one place to another by bulk motion of a fluid, generally horizontally.
Hello everyone! About the author Jack Sillin Jack Sillin is an Atmospheric Science student Cornell '22 and weather forecaster who regularly writes for weather.
Related posts. One comment. Nice explanation, thanks! Comment Cancel reply Save my name, email, and website in this browser for the next time I comment.
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