Analyze the microclimatic temperature lapse rate and windward rain-shadow dynamics across the Western Ghats transect in southern India. Statement I: The western slopes of the Ghats receive heavy orographic rainfall, whereas the eastern lee slopes experience a marked rain-shadow deficit. Statement II: As moist air ascends the windward slopes, it cools at the saturated adiabatic lapse rate, whereas descending air on the leeward side undergoes compressional warming at the dry adiabatic lapse rate. Which of the following is correct?

💡 Solution & Explanation

Orographic lifting forces warm, moisture-laden monsoon winds to rise, cool, and condense, dropping heavy precipitation on the windward slopes of Kerala. Upon descending the eastern side into interior Tamil Nadu, the air warms compressively at the dry adiabatic lapse rate of approximately 9.8 degrees Celsius per kilometer, increasing its moisture-holding capacity and creating an arid rain-shadow zone. This sharp climatic contrast occurs over very short horizontal distances across the mountain crest. The Western Ghats act as a formidable barrier to low-level atmospheric circulation.