The question asks about the transformation of South-East Trade Winds into a monsoon system over India due to the Coriolis force. This involves understanding the global wind patterns, the effect of the Coriolis force, and the mechanism of the Indian monsoon.
C) South-West Monsoon: The South-East Trade Winds, after crossing the Equator, are deflected to the right by the Coriolis force and become the South-West Monsoon, which is the primary rainy season for India.
The question asks about the nature of the Somali Jet, a critical component of the Indian monsoon. We need to identify its characteristics and location to determine the correct option.
C) A low-level jet stream blowing along the East African coast toward India. This option correctly identifies the Somali Jet as a low-level atmospheric current that plays a vital role in transporting moisture from the Southern Hemisphere across the Arabian Sea to India, thus strengthening the monsoon.
The question asks to identify the characteristic of the 'monsoon trough' during the active monsoon season. This requires knowledge of Indian monsoon meteorology, specifically the pressure systems involved.
A) Low pressure lying over the Gangetic plains: This accurately describes the monsoon trough. It is a zone of convergence of moist winds, leading to uplift and precipitation, which is characteristic of a low-pressure area over the Gangetic plains during the active monsoon.
The question asks for the best description of the 'burst of monsoon'. This phenomenon is a key characteristic of the Indian monsoon, marking its arrival. We need to identify the option that accurately captures this sudden and significant change in weather patterns.
C) Sudden onset of heavy widespread rainfall after a hot, dry pre-monsoon period. This is the most accurate description. The 'burst' signifies the abrupt change from the dry, hot weather of the pre-monsoon season to a period of intense and widespread rainfall, marking the official arrival of the monsoon.
The question asks about the influence of the Mascarene High on the Indian monsoon. Understanding the role of high-pressure systems in atmospheric circulation, particularly in relation to monsoon winds, is key to answering this question.
Correct Option: D) Determining the strength of cross-equatorial moisture-laden winds. The Mascarene High is crucial for generating and strengthening the pressure gradient that drives the cross-equatorial flow of moisture-laden winds towards the Indian subcontinent, thereby directly influencing the strength of the Indian monsoon.
The South-West Monsoon is a seasonal wind system that brings significant rainfall to India. Its withdrawal is a crucial meteorological event. Understanding the atmospheric circulation patterns and their seasonal shifts is key to identifying the primary trigger for this withdrawal.
D) Southward movement of the Subtropical Westerly Jet Stream — The southward movement and re-establishment of the Subtropical Westerly Jet Stream over the Indian subcontinent is a primary atmospheric phenomenon that marks the beginning and progression of the South-West Monsoon's withdrawal. Its presence south of the Himalayas creates a high-pressure environment that inhibits the moist monsoon winds.