FRONTS AND FRONTOGENESIS
Front : Sloping boundary which separates two opposing air masses having contrasting characteristics in terms of temprature, humidity, density, pressure and wired direction
Frontal Zone /Frontal Surface : Represent zone of discontinuity is the properties of opposing contrasting air masses.
FRONTOGENESIS : Process associated with the creation of new fronts or the regeneration of decaying fronts already in existence is called frontogenesis.
FRONTOCYSIS : Process of destruction or decaying of fronts is called FRONTOCYSISNecessary Condition for frontogenesis.
Pressure of two opposing air masses having contrasting properties of air temperature , air pressure, density , humidity, and weird direction.
Inspite of Convergence of two air masses at the equator no front is formed due to uniform temperature condition of two air masses.
Four Types Of Air Circulation:
Convergent and Divergent Circulation:
Deformatory Circulation : Involves convergue of two contrasting air masses and horizontal spread along line which is called air axis of outflow or axis of diacation.
Other axis is called axis of inflow. This type of air circulation is most favourable for frontozeniesis.
CREATION OF FRONTS : Contrasting air masses converge is deformation circulation they spread horizontally alng the axis of outflow dialaction.
In such a situation creation of fronts depend on angle between the axis of outflow and isotherms.
Front don’t form when angle exceeds 45 degree.
As the convergence of air continues –Angel decreases and isotherm tries to become parallel to the axis of overflow and FRONTOGENESIS gets activated.
Steepness and intensity of fronts depends on temperature gradient.
If two contrasting air masses are parallel to each other and there is no upward displacement of air -Stationary front is formed.
Stationary front Climatical air significant – Not Conductive for cloud formation and preparation
Fronts are not linear between two converging contrasting air masses.
Fronts are formed only in the areas were two air masses converge. The three principal frontal zones on the earth surface.
Polar Front: are formed is the middle attitudes in both the hemisphere because convergence of polar contenental air masses and tropical air mass.
More developed in northern part of pacific and Atlantic ocean .
Temperate cyclone produced along polar front travel from west to east under this influences of west lies and yield widespread precipitation over large area Extending from the eastern parts of North America to Western Europe.
Polar front is wcakened during summer season because the temperature contrast between two air masses is minimum.
Artic Frontal Zone : Created in artic area due to convergence of continental and maritime polar air masses.
Not very strong and active because of less temperature contrast between two air masses.
Active fronts are formed – Relatively warm polar maritime air masses meets extremely cold and artic air masses due to which temperature contrast are accentuated.
MEDITERRANEAN FRONTAL ZONE : Formed due to convergence of cold continental European air masses and winter air masses of North Africa. Along Mediterranean caspian sea live.
-Some of these frontal weather disturbance reach Pakistan and north –west India and account for winter precipitation of North India.
Pacific Polar Frontal Zone : Two Frontal zones develop during winter season over the North Pacific ocean.
Frontal disturbance developed along the frontal zone of north-easr pacific ocean influence the winter time weather condition of western coast of North America
Pacific Artic Frontal zone : Developed along a time running from the rocky mountain to the great cakes during the winter season.
Intertropical Frontal Zone :Tropical front is formed near the equator due to convergence of North East and South East trade wind.
It may be pointed out that there is no temperature contrast between these two air masses of similar origin and similar properties
Changing weather associated with Fronts : Precipitation of long duration , Cloud Sequences Ciro-stratus , alto stratus and nimbo stratus.
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