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Highest-ever ocean temperature measured as powerful El Niño forms
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Scientists have recorded the highest-ever global average sea-surface temperature, reaching 70 degrees Fahrenheit on August 22. This record was confirmed by Europe's Copernicus Climate Change Service, which tracks the metric daily. The measurement surpasses the previous single-day record set earlier in March 2024. The new high occurs as a powerful El Niño event intensifies in the tropical Pacific, combining with long-term human-driven climate change.
The El Niño phenomenon, characterized by unusual warming of ocean surface waters, periodically influences global weather patterns. However, experts emphasize it is occurring on top of decades of anthropogenic global warming. This combination is pushing ocean temperatures to unprecedented levels. The August timing is particularly concerning because global ocean temperatures typically peak later, in March and April, following the Southern Hemisphere summer.
The implications of rising ocean temperatures are severe and wide-ranging. Warmer oceans transfer more heat and moisture to the atmosphere, which can intensify storms and heatwaves on land. This contributes to rising sea levels and increases the frequency of extreme weather events. Furthermore, warmer water has a reduced capacity to absorb carbon dioxide from the atmosphere, potentially accelerating climate change.
The marine ecosystem faces significant risks from this thermal stress. Higher temperatures can lead to coral bleaching, disrupt fish migration patterns, and threaten biodiversity. Coastal communities are also vulnerable, facing increased risks from storm surges and erosion. The strain on these communities and ecosystems is expected to grow as the trend continues.
Copernicus scientists have noted that record temperatures have already been measured in isolated oceanic regions, such as the western Mediterranean Sea and polar areas. These localized records are primarily attributed to human-induced climate change. The global record now confirms the widespread nature of the warming trend. The agency expects the influence of El Niño to further supercharge ocean temperatures in the coming months.
The Copernicus report underscores the accelerating pace of ocean warming. Samantha Burgess, the strategic lead for climate at the European Centre for Medium-Range Weather Forecasts, stated that El Niño is adding heat on top of decades of human-driven warming. She warned that as ocean temperatures rise, risks to marine ecosystems and coastal communities increase. This latest record serves as a stark indicator of the planet's changing climate system.
Looking ahead, forecasters anticipate the powerful El Niño will continue to influence global climate through the end of the year. This is likely to result in more record-breaking temperatures on both land and in the oceans. The event highlights the critical need for robust climate mitigation and adaptation strategies. Continued monitoring by agencies like Copernicus will be essential to understand and respond to these rapid changes.
