New Delhi [India], September 10 (ANI): A groundbreaking study has linked the formation of Antarctica around 34 million years ago to the early evolution of the Indian monsoon system, which once sustained lush forests across the subcontinent, the Ministry of Science and Technology said on Tuesday.
The discovery of well-preserved fossil leaves from the Laisong Formation in Nagaland, dating back about 34 million years, suggests that the region once experienced a warm and wet climate. Researchers from the Birbal Sahni Institute of Palaeosciences (Lucknow) and the Wadia Institute of Himalayan Geology (Dehradun), both autonomous institutions under the Department of Science and Technology (DST), carried out detailed climate reconstructions. Their findings revealed extremely high rainfall and temperatures during that period.
Scientists traced the cause of these extreme tropical conditions to the timing of Antarctic ice sheet formation. As massive ice sheets began developing at the South Pole, global wind and rainfall patterns shifted. This reshaping of the Intertropical Convergence Zone (ITCZ), a key tropical rain belt, brought intense monsoonal rains to Northeast India.
The study, published in Palaeogeography, Palaeoclimatology, Palaeoecology, highlights that Antarctic glaciation played a crucial role in shaping the Indian monsoon system. To reach this conclusion, researchers analyzed fossilized leaves using CLAMP (Climate Leaf Analysis Multivariate Program), a technique that reconstructs ancient climates by examining leaf size, shape, and structure. Their results confirmed that Nagaland once had significantly wetter and warmer conditions, closely aligned with the onset of Antarctic glaciation.
Beyond its insights into Earth’s deep past, the research carries warnings for the future. As modern climate change accelerates Antarctic ice melt, the ITCZ may shift again, potentially disrupting tropical rainfall patterns. For India and neighboring countries, this could lead to profound changes in the monsoon—the backbone of agriculture, water security, and millions of livelihoods.
The study underscores that Earth’s climate operates as a deeply interconnected system. Events in Antarctica can reverberate as far as the humid forests of Nagaland, reminding us that understanding past climate shifts is essential to preparing for the challenges of a warming future. (ANI)
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