El Niño Phenomenon and Its Global Impact

<p>In the middle of the Pacific Ocean, along the equator, scientists have drawn a box measuring two-thirds the size of China, which is monitored by satellites and a network of moored buoys that measure changes in water temperature. This area, known as Niño 3.4, is currently experiencing a rise in temperature. A half degree Celsius increase above normal over months indicates the beginning of an El Niño phase, which can lead to global weather disruptions such as floods, droughts, and famine.</p><p>Kristina Tietjen, a researcher who has studied coral reefs in Kiritimati for over a decade, noted that during her recent visit, the waters were 3 to 4 degrees Celsius above normal. She observed significant coral bleaching, with nearly half of the remaining corals on the island affected. The last major El Niño event in 2015–16 resulted in the death of 90 percent of Kiritimati’s coral reef.</p><p>The effects of El Niño are felt worldwide as the heat from the equatorial Pacific influences atmospheric conditions. For instance, heavy rains and landslides have recently impacted Peru, while regions like India and Ethiopia are experiencing severe droughts. This El Niño is projected to be one of the strongest on record, with temperatures in the Niño 3.4 box already surpassing the threshold for a “Super El Niño.” Malte Stuecker, director of the International Pacific Research Center, indicated that the current warming could peak significantly higher than previous events.</p><p>Buoys along the equator can detect warm water below the surface, indicating that a large mass of heat is set to rise in the coming months. The global average sea-surface temperature reached 21.1 degrees Celsius, the highest on record, according to Europe’s Copernicus Climate Change Service. This increase in baseline temperatures is causing more frequent and severe impacts on marine ecosystems.</p><p>Carlos Zavalaga, director of the seabird lab at the Universidad Cientifica del Sur in Lima, reported observing dead seabirds along the coasts of Peru and Ecuador. The warming waters have displaced the cold, nutrient-rich Humboldt current, leading to a decline in fish stocks, prompting Peru to shut down an anchovy fishery critical to its economy.</p><p>Bill Newton, a resident of Kiritimati, noted significant changes on the island, including increased flooding and changes in local wildlife. Corals are particularly vulnerable to temperature changes, with even a slight increase leading to bleaching. Julia Baum, an ecologist studying Kiritimati’s reef, expressed concerns that the frequency of bleaching events may not allow corals to recover adequately.</p><p>El Niño is a predictable warming phase that influences global weather patterns. The U.S. Navy is preparing to send a hospital ship to Peru to assist with anticipated flooding. However, scientists caution that the outcomes of this El Niño may differ from past events, highlighting the need for ongoing research and monitoring.</p>