(i) Cold weather season takes place from December-to February. (ii) The temperature decreases from south to north. (iii) The average temperature of the Northern Plains ranges between 10" to 50.C; whereas the average temperature of Chennai is between 24"c to 25"c. (iv) Days are warm and nights are coRead more
(i) Cold weather season takes place from December-to February.
(ii) The temperature decreases from south to north.
(iii) The average temperature of the Northern Plains ranges between 10″ to 50.C;
whereas the average temperature of Chennai is between 24″c to 25″c.
(iv) Days are warm and nights are cold.
(v) During this season, northeast trade winds prevail over the country; they blow from the land to the sea and are dry.
(i) withdrawal or the retreat of monsoon is a more gradual process. (ii) The withdrawal of the monsoon begins in the north western states of India, by early September. (iii) By mid-October, it withdraws completely from the northern half of the peninsula. (iv) The withdrawal from the southern half ofRead more
(i) withdrawal or the retreat of monsoon is a more gradual process.
(ii) The withdrawal of the monsoon begins in the north western states of India, by early September.
(iii) By mid-October, it withdraws completely from the northern half of the peninsula.
(iv) The withdrawal from the southern half of the peninsula is fairly rapid.
(v) By early December, the monsoon withdraws from the rest of the country.
' (i) Normally, when the tropical eastern south pacific ocean experiences high pressure, the tropical eastern Indian ocean experiences low pressure. (ii) But in certain years, there is a reversal in the pressure conditions and the eastern pacific has low pressure in comparison to the Indian ocean. (Read more
‘ (i) Normally, when the tropical eastern south pacific ocean experiences high
pressure, the tropical eastern Indian ocean experiences low pressure.
(ii) But in certain years, there is a reversal in the pressure conditions and the eastern pacific has low pressure in comparison to the Indian ocean.
(iii) This periodic change in pressure conditions is known as southern
Oscillation or SO.
(iv) The difference in pressure over Tahiti, in the pacific ocean and Darwin in northern Australia is computed to predict the intensity of the monsoon.
(v) A feature connected with the So is the El Nino, a warm ocean current
that flows past the peruvian coast, in place of the cold peruvian current every 2 to 5 years.
(vi) The change in pressure conditions are connected to the El Nino. Hence,
the phenomena is referred to as ENSO (EI Nino Southern oscillations).
(i) The differential heating and cooling of land and water creates low pressure on the landmass of India, while the seas around experience comparatively high Pressure. (ii) The shift in the position of Inter Tropical Convergence Zone (ITCZ) in summer over the Ganga plain is a trough of low pressureRead more
(i) The differential heating and cooling of land and water creates low
pressure on the landmass of India, while the seas around experience
comparatively high Pressure.
(ii) The shift in the position of Inter Tropical Convergence Zone (ITCZ)
in summer over the Ganga plain is a trough of low pressure in the
equatorial latitude. This is where the northeast and the southeast trade
winds converge.
(iii) The presence of the high pressure, area, east of Madagascar also affects
the Indian monsoons.
(iv) The Tibetan plateau gets intensely heated during summer, which results
in the formation of low pressure area over the plateau.
(v) The movement of the westerly jet streams to the north of the Himalayas
and the presence of tropical easterly jet streams over the Indian Peninsula
during summers, also affects the mechanism of monsoon.
Jet streams are fast flowing winds moving in the upper air of the atmosphere. (i) Sub-tropical Westerly Jet Streams: These jet streams are located approximately over 27'-30' north latitude; therefore, they are known as sub-tropical westerly jet streams. over India, these jet streams blow south of thRead more
Jet streams are fast flowing winds moving in the upper air of the atmosphere.
(i) Sub-tropical Westerly Jet Streams: These jet streams are located
approximately over 27′-30′ north latitude; therefore, they are known
as sub-tropical westerly jet streams. over India, these jet streams blow
south of the Himalayas all through the year except in summer. During
winters, the cyclonic disturbances are brought into India by these jet
streams.
(ii) Tropical-easterly Jet Streams: These easterly jet streams blow over
peninsular India, approximately over l4’N, during the summer months.
it is believed to be responsible for the sudden outbreak of the south-west
monsoon in India.
State the chief characteristics of the cold weather season in India.
(i) Cold weather season takes place from December-to February. (ii) The temperature decreases from south to north. (iii) The average temperature of the Northern Plains ranges between 10" to 50.C; whereas the average temperature of Chennai is between 24"c to 25"c. (iv) Days are warm and nights are coRead more
(i) Cold weather season takes place from December-to February.
See less(ii) The temperature decreases from south to north.
(iii) The average temperature of the Northern Plains ranges between 10″ to 50.C;
whereas the average temperature of Chennai is between 24″c to 25″c.
(iv) Days are warm and nights are cold.
(v) During this season, northeast trade winds prevail over the country; they blow from the land to the sea and are dry.
How does the process of withdrawal of monsoon take place in India?
(i) withdrawal or the retreat of monsoon is a more gradual process. (ii) The withdrawal of the monsoon begins in the north western states of India, by early September. (iii) By mid-October, it withdraws completely from the northern half of the peninsula. (iv) The withdrawal from the southern half ofRead more
(i) withdrawal or the retreat of monsoon is a more gradual process.
See less(ii) The withdrawal of the monsoon begins in the north western states of India, by early September.
(iii) By mid-October, it withdraws completely from the northern half of the peninsula.
(iv) The withdrawal from the southern half of the peninsula is fairly rapid.
(v) By early December, the monsoon withdraws from the rest of the country.
What do you understand by the phenomenon of ENSO?
' (i) Normally, when the tropical eastern south pacific ocean experiences high pressure, the tropical eastern Indian ocean experiences low pressure. (ii) But in certain years, there is a reversal in the pressure conditions and the eastern pacific has low pressure in comparison to the Indian ocean. (Read more
‘ (i) Normally, when the tropical eastern south pacific ocean experiences high
See lesspressure, the tropical eastern Indian ocean experiences low pressure.
(ii) But in certain years, there is a reversal in the pressure conditions and the eastern pacific has low pressure in comparison to the Indian ocean.
(iii) This periodic change in pressure conditions is known as southern
Oscillation or SO.
(iv) The difference in pressure over Tahiti, in the pacific ocean and Darwin in northern Australia is computed to predict the intensity of the monsoon.
(v) A feature connected with the So is the El Nino, a warm ocean current
that flows past the peruvian coast, in place of the cold peruvian current every 2 to 5 years.
(vi) The change in pressure conditions are connected to the El Nino. Hence,
the phenomena is referred to as ENSO (EI Nino Southern oscillations).
State the factors which help us understand the mechanism of monsoon.
(i) The differential heating and cooling of land and water creates low pressure on the landmass of India, while the seas around experience comparatively high Pressure. (ii) The shift in the position of Inter Tropical Convergence Zone (ITCZ) in summer over the Ganga plain is a trough of low pressureRead more
(i) The differential heating and cooling of land and water creates low
See lesspressure on the landmass of India, while the seas around experience
comparatively high Pressure.
(ii) The shift in the position of Inter Tropical Convergence Zone (ITCZ)
in summer over the Ganga plain is a trough of low pressure in the
equatorial latitude. This is where the northeast and the southeast trade
winds converge.
(iii) The presence of the high pressure, area, east of Madagascar also affects
the Indian monsoons.
(iv) The Tibetan plateau gets intensely heated during summer, which results
in the formation of low pressure area over the plateau.
(v) The movement of the westerly jet streams to the north of the Himalayas
and the presence of tropical easterly jet streams over the Indian Peninsula
during summers, also affects the mechanism of monsoon.
What are jet streams? How do they affect the climate?
Jet streams are fast flowing winds moving in the upper air of the atmosphere. (i) Sub-tropical Westerly Jet Streams: These jet streams are located approximately over 27'-30' north latitude; therefore, they are known as sub-tropical westerly jet streams. over India, these jet streams blow south of thRead more
Jet streams are fast flowing winds moving in the upper air of the atmosphere.
See less(i) Sub-tropical Westerly Jet Streams: These jet streams are located
approximately over 27′-30′ north latitude; therefore, they are known
as sub-tropical westerly jet streams. over India, these jet streams blow
south of the Himalayas all through the year except in summer. During
winters, the cyclonic disturbances are brought into India by these jet
streams.
(ii) Tropical-easterly Jet Streams: These easterly jet streams blow over
peninsular India, approximately over l4’N, during the summer months.
it is believed to be responsible for the sudden outbreak of the south-west
monsoon in India.