These maps are showing the portion of Indian Ocean lying north of equator . (a) pre-SW monsoon (b) NE monsoon (c) during SW monsoon.

Question

1. Study maps carefully. These maps are showing the portion of Indian Ocean lying north of equator. Maps in the figure depict the temperature conditions in three seasons: 

(a) pre-SW monsoon 

(b) NE monsoon 

(c) during SW monsoon.

Answer the following questions:

1. Why are isotherms not drawn on the continental part?

2. Why is the temperature low in Arabian Sea than in Bay of Bengal?

3. Why is the temperature higher in southern portion of Indian Ocean during pre-SW monsoon?

Answer 1

1. The isotherms are not drawn on the continental part because there is summer season and the temperature is high almost everywhere. Since there is no variation in temperature, isotherms are not drawn.

2. The temperature is low in Arabian Sea than in Bay of Bengal due to following reasons- 

a. The salinity of the Arabian Sea is high so it lowers the temperature but the salinity of Bay of Bengal is Low. 

b. The Arabian Sea is open and broad sea compared to Bay of Bengal which is narrow and enclosed by landmasses. There is a lot of movement of ocean water in the Arabian Sea as compared to the Bay of Bengal.

3. The southern portion of the Indian Ocean is closer to the equator compared to the northern portion of the Arabian Sea. During pre-SW monsoon period, Uttarayan is observed therefore the temperature is high.