Latitudinal variations, Biology

Latitudinal Variations

The latitudinal variation of temperature over the earth is the result of two main variables

  • incoming solar radiation and
  • the distribution of land and water masses


What do you think could be the other factors influencing temperature?

The movement of wind and water, and the direction of slopes of hills and mountains also modify the temperature.

We know that the length of the day varies at higher latitudes. That means the incoming solar radiation varies. However, if we compute the average, every point on the earth gets the same total hours of daylight each year, an average of 12 hours per day, but not the same amount of heat. The latter depends upbn the amount of radiant energy delivered/unit area/hr and this depends upon the angle of landing sunlight. You have learnt in the previous section that vertical beams afe more intense than the oblique beams that land on the higher latitudes. Hence we find a gradual decrease in the amount of incident radiant energytunit area along the increasing latitudes, horizontally.

On the basis of temperature variation three distinct heat zones can be distinguished in each hemisphere (Figure shown below). The hot torrid zones are near the equator. moderate or temperate zones are in the middle, the cold zones are at the poles. Each zone is characterised by typical plants and animal populations found in the area.

1963_heat zones.jpg

Posted Date: 12/10/2012 6:26:55 AM | Location : United States

Related Discussions:- Latitudinal variations, Assignment Help, Ask Question on Latitudinal variations, Get Answer, Expert's Help, Latitudinal variations Discussions

Write discussion on Latitudinal variations
Your posts are moderated
Related Questions
Name the various suturing techniques There are a various suturing techniques each suited for a particular situation. Few of the common suturing techniques are mentioned here

What are primary consumers? Can a food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secon

Synthesis of fatty acids requires the movement of citrate out of the mitochondria. This occurs under conditions of high levels of acetyl CoA which is needed to stimulate the activi


Q. Show Imbalances of basal nuclei? BASAL NUCLEI - Gray matter "islands" located deep within cerebral white matter. These nuclei process a variety of descending motor informat

Define briefly about the Selenium? The element selenium was discovered in 1817 in association with the element sulphur. However, selenium as an essential nutrient remained unre

Question: (i) Which species of microalgae are associated with ciguatera fish poisoning? (ii) Name five fish species generally implicated in ciguatera fish poisoning in Mau

How to improve natural history of adults with congenital heart disease? Improving the natural history of adults with CHD: As mentioned above the populations of adults with CH

Circulatory system, closed is a system which uses a continuous series of the vessels of different sizes to deliver blood to body cells and return it back to the heart; it is found