INCOIS warns of Marine Heat Wave, issues swell surge alert for east and west coasts
The warming conditions could adversely affect coral reef ecosystems, marine productivity and coastal biodiversity
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Context
The (INCOIS) has issued a Marine Heat Wave (MHW) warning for the Arabian Sea, Indian Ocean, and Bay of Bengal, indicating elevated sea surface temperatures. Concurrently, a swell surge warning has been issued for the east and west coasts of India, including the Andaman and Nicobar Islands. These events highlight the increasing frequency of extreme oceanic and coastal events linked to broader climate change patterns, posing significant risks to marine ecosystems and coastal communities.
UPSC Perspectives
Environmental
The emergence of Marine Heat Waves (periods of abnormally high ocean temperatures) is a direct consequence of global warming, as oceans absorb over 90% of the excess heat trapped by greenhouse gases. This INCOIS warning is crucial for the , as it highlights the cascading impacts on marine biodiversity. Prolonged elevated temperatures lead to coral bleaching (expulsion of symbiotic algae, causing corals to turn white and potentially die), threatening the intricate coral reef ecosystems that support vast marine life. The alert specifically mentions threats to seagrass meadows and seaweed ecosystems, which act as vital carbon sinks (natural environments that absorb carbon dioxide). The potential for 'biodiversity loss and shifts in species distribution' underscores the disruption of marine food webs, which can have long-term ecological consequences. For Mains, candidates should link these events to India's commitments under the and the need for adaptive marine conservation strategies.
Geographical
From a physical geography perspective, this news connects oceanography with disaster management. A swell surge (a sudden increase in wave height reaching the coast, often generated by distant storms or prolonged strong winds) is different from a tsunami or a storm surge associated with a local cyclone. Swells can travel thousands of kilometers across ocean basins before impacting coastlines. The INCOIS warning for waves of one meter or higher along extensive coastal stretches, including Gujarat to West Bengal and the islands, demonstrates the widespread impact of such oceanographic phenomena. The classification of the MHWs into 'Watch' and 'Alert' categories based on sea surface temperature anomalies (deviations from the long-term average) is a key monitoring tool. UPSC Prelims often test the understanding of these distinct coastal hazards and the agencies responsible for monitoring them. The spatial distribution mentioned in the article, covering the Arabian Sea, Bay of Bengal, and the Indian Ocean, highlights India's vast maritime vulnerability.
Governance
The role of specialized scientific bodies is central to effective disaster risk reduction and climate adaptation. , an autonomous body under the , is mandated to provide ocean information and advisory services to various stakeholders, including coastal communities and the fishing industry. This early warning system is a critical component of coastal governance, allowing for proactive measures to mitigate the impacts of extreme events. The issuance of a 'danger alert' for Car Nicobar Island specifically highlights the vulnerability of small island territories. For UPSC Mains (GS Paper 3), this illustrates the application of science and technology in Disaster Management, emphasizing the shift from a reactive to a proactive approach. Candidates should analyze how these warnings translate into actionable advisories for fishermen (e.g., restricting sea ventures) and coastal authorities, assessing the effectiveness of the 'last mile connectivity' in early warning dissemination.