Roadmap for Answer Writing Introduction Begin by introducing the significance of precipitation in India, noting that it constitutes 80% of the annual rainfall during the monsoon season. Mention the extreme spatial variation in precipitation from over 400 cm in some northeastern regions to ...
Model Answer Barrier Effect The Western Ghats serve as a significant barrier to the monsoonal winds that arrive from the southwest. As these winds encounter the mountains, they are forced to rise, resulting in orographic rainfall. This effect leads to substantial precipitation in the region, with 65Read more
Model Answer
Barrier Effect
The Western Ghats serve as a significant barrier to the monsoonal winds that arrive from the southwest. As these winds encounter the mountains, they are forced to rise, resulting in orographic rainfall. This effect leads to substantial precipitation in the region, with 65% to 80% of annual rainfall occurring between June and September (Source: meteorological studies).
Gaps in the Western Ghats
Despite their overall barrier function, the Western Ghats feature gaps that allow rain-bearing winds to pass through with less precipitation. A notable example is the Palghat Gap, which is approximately 30 kilometers wide and located between the Nilgiri and Anamalai Hills in Kerala. This gap enables winds to cross over to the leeward side, leading to reduced rainfall in the immediate coastal areas (Source: geographic studies).
Variations in Mountain Topography
The topography of the Western Ghats varies significantly. In Karnataka, the broader mountains compel rain-bearing winds to travel greater distances, allowing more time for moisture to coalesce and resulting in higher rainfall (Source: hydrological analyses).
Increased Convection
The gentle slopes of the Karnataka Western Ghats absorb more sunlight, promoting greater convection compared to the steeper slopes found in Maharashtra and Kerala. This enhanced convection contributes to increased rainfall in these areas (Source: climate studies).
Distance from Peak
Interestingly, areas of heavy rainfall are often found up to 50 kilometers away from the mountain peaks. This phenomenon occurs because the distance allows for better moisture accumulation in cloud formations (Source: meteorological research).
Cyclones
Additionally, the Arabian Sea has seen more frequent cyclones in recent years during the onset of the South-West monsoon. The Western Ghats act as a barrier for these cyclonic storms, reducing their intensity and protecting the coastal regions of India (Source: climatological studies).
In summary, the Western Ghats significantly regulate South-West monsoonal rainfall in India’s coastal regions through orographic lifting, variations in topography, and their role in influencing cyclonic activity.
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Model Answer Introduction India experiences a highly variable distribution of precipitation, with significant spatial and temporal differences across the country. Around 80% of the nation's annual rainfall occurs during the monsoon season, which plays a crucial role in agriculture and water resourceRead more
Model Answer
Introduction
India experiences a highly variable distribution of precipitation, with significant spatial and temporal differences across the country. Around 80% of the nation’s annual rainfall occurs during the monsoon season, which plays a crucial role in agriculture and water resources. However, rainfall varies from over 400 cm in the northeastern states to less than 10 cm in arid regions like Rajasthan. Various factors, such as geographical location, monsoon systems, and topography, contribute to these variations.
Spatial Variations
Temporal Variations
Factors Contributing to Variations
Conclusion
Understanding the spatial and temporal variations in precipitation is crucial for managing India’s water resources and adapting to climate change. By analyzing these patterns, India can implement better strategies for water conservation and sustainable development.
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