Weakening of AMOC: Implications for the Indian Monsoon and Water Security
GS1GS3
Recent oceanographic studies indicate a significant slowing of the Atlantic Meridional Overturning Circulation (AMOC), which could shift the Intertropical Convergence Zone (ITCZ) southward. This geophysical shift poses a long-term risk of erratic monsoon patterns and extreme droughts in India, threatening the subcontinent's water and food security.
The Atlantic Meridional Overturning Circulation (AMOC), often described as the ocean's 'conveyor belt,' is a critical system of currents that redistributes heat from the tropics to the Northern Hemisphere. Recent research published in Nature suggests that this system is at its weakest in over a millennium, primarily due to the influx of freshwater from melting Arctic ice and the Greenland ice sheet. This freshening reduces the salinity and density of surface waters, preventing them from sinking and driving the circulation.
The weakening of the AMOC has far-reaching consequences beyond the Atlantic. One of the most significant impacts for the Indian subcontinent is the potential southward shift of the Intertropical Convergence Zone (ITCZ). The ITCZ is a low-pressure belt where trade winds from the Northern and Southern Hemispheres converge; its seasonal northward migration is the primary driver of the Indian Summer Monsoon (ISM). A southward shift of the ITCZ, triggered by a cooler Northern Hemisphere resulting from a sluggish AMOC, could lead to a significant reduction in monsoonal rainfall over India.
Continue reading — free with login
JeetoBharat publishes daily UPSC current affairs mapped to the Mains syllabus. Log in to read full articles.
Log in to read full articleNo credit card required. Free registered users get unlimited access.
This article was curated using AI. While we strive for accuracy, please verify critical facts from official sources.