“Irrigation leads to lower surface temperatures, causing lower thermal gradients (difference in temperature) between surface and air,” AchutaRao said. “This thermal gradient is responsible for drawing moisture from the oceans which drives the monsoon cycle. Lower thermal gradient means weaker monsoon and lower rainfall,” he added.
There are, however, competing processes by which irrigation could affect local rainfall. When more water is available on the ground, there is more evaporation, which means more moisture in the air and more rainfall locally. This is called recycling.
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Irrigation does more than deplete groundwater, it changes climate too of the temperature rise from increasing greenhouse gases in the atmosphere. But, the climatic effects of irrigation are not limited to cooler temperatures, it changes rainfall patterns as well. <span>“Irrigation leads to lower surface temperatures, causing lower thermal gradients (difference in temperature) between surface and air,” AchutaRao said. “This thermal gradient is responsible for drawing moisture from the oceans which drives the monsoon cycle. Lower thermal gradient means weaker monsoon and lower rainfall,” he added. There are, however, competing processes by which irrigation could affect local rainfall. When more water is available on the ground, there is more evaporation, which means more moisture in the air and more rainfall locally. This is called recycling. Both processes can occur simultaneously in some places; one could overpower the other. “If recycling is more important than the moisture transport from the ocean, then the rainfall incr Summary
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