IIT Researchers Develop New Method to Identify Monsoon Patterns in India
IIT Madras and Gauhati University unveil a new approach to predict monsoon onset, aiding farmers and government water management.
New Delhi, November 10 (Daily Kiran) : Researchers from IIT Madras and Gauhati University have discovered a novel method for identifying the onset of the monsoon in India. This advancement could significantly assist farmers in planning sowing activities and help the government manage water resources effectively.
According to the researchers, the first raindrop in a region does not necessarily indicate the arrival of the monsoon. In India, a large portion of agriculture relies on the monsoon, making accurate predictions of its onset crucial for farmers. If local rainfall is mistaken for the start of the monsoon and farmers proceed with sowing, they risk crop damage if subsequent rains do not follow.
The study analyzed 84 years of rainfall data. It revealed that the monsoon typically begins around May 15 in northeastern India, while in peninsular India, the onset occurs approximately on June 9. The researchers found that during the onset period, the size of the largest rainfall cluster increases dramatically, subsequently expanding geographically and moving northward.
This process signals the monsoon’s progression across the country. The study uniquely examines the interconnections between rainfall patterns in different regions, rather than focusing on a single location. By employing climate networks and complex systems theories, the researchers aimed to understand when localized rainfall becomes part of a larger, interconnected monsoonal system. This distinction will aid in determining the appropriate time for sowing, as well as in preparing for water resource management and flood readiness.
The findings have been published in the prestigious Journal of Climate by the American Meteorological Society. Co-authors include Yogendra Patil, Gaurav Chopra, Shruti Tandon, Prof. R.I. Sujit, and Prof. B.N. Goswami. The researchers conceptualized different geographical locations as a network, treating each as a center. The relationships between these centers were established based on the onset of rainfall, allowing scientists to observe how smaller rainfall groups connect and gradually form a larger system.
Prof. R.I. Sujit emphasized that the arrival of the monsoon at a location is not determined solely by its initial rainfall. Instead, it is recognized as the start of the monsoon when local rainfall becomes part of the largest rainfall group linked to the broader monsoonal system across the country.
The researchers view this transition as a significant change within the climate network. Prof. Sujit noted that this new method could help avoid misjudging the monsoon’s onset, providing farmers with better timing for sowing and assisting policymakers in planning for food security and water resource management.
To illustrate the method, researchers explained how the monsoon progresses from northeastern India to peninsular regions. In April, localized rainfall in various parts of northeastern India creates small groups, including thunderstorms. As the season progresses, these groups grow and eventually connect with other clusters forming in the Bay of Bengal. This connection leads to a sudden increase in the size of the largest rainfall group.
The researchers consider this connection to signify the larger onset of the monsoon in northeastern India. A similar process is observed in peninsular India, where localized rainfall in Kerala forms a small group. When this group merges with the larger rainfall cluster moving westward from northeastern India, it marks the significant onset of the monsoon in peninsular regions.
This new technology helps avoid the misconception that localized rainfall in Kerala signifies the actual start of the monsoon, clarifying whether rainfall is due to local weather or part of a larger monsoonal system. The researchers also noted that after the significant onset of the monsoon in peninsular India, rainfall moves northward, correlating with the initial active wave of seasonal fluctuations within the monsoon, known as the monsoon end-season oscillation.
This advancement signals the establishment of a significant monsoonal system, rather than just brief local rainfall. The researchers applied their new method to analyze the 2026 monsoon as well.
