To know the characteristics of isotherm distribution in the world, we must first learn to look at the isotherm map. The connection line of points with the same temperature value on the diagram is called isotherm, which is the concept of isotherm. If the isotherm is sparse, there is little difference in temperature between different places; The dense isotherms indicate that the temperature varies greatly from place to place; The isotherm is flat, indicating that there are few factors affecting the temperature distribution; The isotherm curve shows that there are many factors affecting the temperature distribution. The isotherm shows an east-west trend, indicating that the temperature changes with latitude, mainly due to latitude factors; The isotherm is parallel to the coastline, indicating that the temperature changes with the distance from the sea, and the distance from the sea is the main factor. If the isotherm is closed, it means that the temperature here changes with the terrain.

Next, observe the distribution map of the world temperature:

The orange in the picture indicates the high temperature area, and the deeper the orange, the higher the temperature; Blue indicates a low temperature zone, and the deeper the blue, the lower the temperature. Observing the isotherm and the temperature corresponding to the color of each region, we can find that:

1, near the equator, in tropical areas, with the highest annual average temperature; In polar regions, the annual average temperature is the lowest in cold regions; From low latitude to high latitude, the temperature gradually decreases. The temperature varying with latitude can be called the latitude factor of climate, which is determined by the movement of the earth and the shape of the sphere. Due to the movement and spherical shape of the earth, the height of the sun changes, which affects the temperature.

2. At the mid-latitude continental margin, there are some isotherms roughly parallel to the coast, and the temperature in these places is influenced by coastal factors;

3. There are some closed isotherms on the Qinghai-Tibet Plateau in the west of China, which shows that the temperature in these places is influenced by topographic factors and distributed vertically.

4. Isotherms in the northern hemisphere are dense, because there are many land and complex terrain in the northern hemisphere, so there are many factors that affect the temperature. There are more oceans in the southern hemisphere, so there are fewer factors that affect the temperature. So the isotherms in the southern hemisphere are sparse.

Continue to observe the world annual average temperature distribution map in June, 5438+ 10 and July;

It can be found that the average temperature in the southern hemisphere is generally higher than that in the northern hemisphere in June 1 and June 1. Because in June+10/October, 5438, the direct point of the sun was close to the tropic of Capricorn, and the sun was high, so the southern hemisphere was heated more and the temperature was higher. On the contrary, the average temperature in the northern hemisphere in July is generally higher than that in the southern hemisphere. Because the direct point of the sun in July is close to the Tropic of Cancer, the height of the sun is also high, and the northern hemisphere is heated more and the temperature is higher than that of the southern hemisphere.

2.5438 June+10, the land temperature at the same latitude in the northern hemisphere is lower than that in the ocean, because the ocean releases heat slowly; In July, the land temperature at the same latitude in the northern hemisphere will be higher than that in the ocean, because the land absorbs heat quickly.

3. Whether it is June 5438+ 10 or July, it follows the annual average temperature distribution law.

In addition to the above, we can also observe the inhomogeneity of isotherms. For example, in June of 5438+ 10, the isosceles line in the northern hemisphere protrudes to the high latitude in the ocean, and it protrudes to the low latitude in July. I hope these can help you.