The world's oceans recorded their highest-ever July temperatures, averaging 20.96 degrees Celsius. This new record surpasses the previous high of 20.89 degrees Celsius, which was set in 2023. The EU's climate monitoring service confirmed these unprecedented figures, highlighting the critical state of global ocean health.
This significant temperature increase is partly fuelled by developing El Niño conditions in the Pacific Ocean. El Niño is a natural weather pattern that, when combined with human-driven global warming, can cause sharp temperature spikes and more extreme weather events worldwide. The warmer oceans contribute to thermal expansion, a major factor in rising sea levels.
This trend fits into a broader global climate crisis, with Ghana, like other coastal nations, facing increased risks from rising sea levels and intensified weather patterns. The Intergovernmental Panel on Climate Change (IPCC) has consistently warned about the severe economic and social impacts of ocean warming. Ghana's coastal communities are particularly vulnerable to erosion and flooding, which can displace populations and damage vital infrastructure.
Samantha Burgess, strategic lead for climate at the European Center for Medium-Range Weather Forecasts, stated that "climate change is intensifying heat extremes, with heat and drought increasingly reinforcing one another." This expert assessment underscores the interconnectedness of global warming and its diverse manifestations, from ocean temperatures to terrestrial heatwaves.
Looking ahead, the continued warming of oceans implies more frequent and severe marine heatwaves, which devastate coral reefs and fisheries. It also means more intense tropical storms and heavier rainfall, posing significant threats to coastal regions globally. Decision-makers and markets will need to respond to these escalating climate risks, potentially through investments in climate resilience and adaptation strategies.
The average sea surface temperature (SST) outside the polar regions, specifically between 60 degrees north and 60 degrees south, reached 20.96C last month. This measurement excludes the extreme cold of the poles to provide a clearer picture of warming in habitable zones. The previous high of 20.89C was recorded just last year, indicating a rapid acceleration in ocean warming.
Last month was also the joint second-warmest July globally on record, with temperatures 1.47C above the estimated pre-industrial average. This global temperature anomaly highlights the widespread nature of the current warming trend. Western Europe, for instance, experienced its hottest ever June and July, with prolonged hot and dry conditions. These conditions fueled extreme wildfires across the region, causing significant environmental and economic damage.
Oceans play a vital role in regulating the Earth's climate. They absorb most of the excess heat generated by greenhouse gas emissions and produce half of the Earth's oxygen. The warming of these crucial regulators disrupts marine ecosystems and affects global weather patterns. As seawater warms, it expands, and this thermal expansion accounts for roughly one-third of the sea level rise recorded by scientists to date. This expansion directly threatens low-lying coasts and island nations, including parts of Ghana.
Hotter seas also drive longer and fiercer marine heatwaves. These heatwaves have already bleached coral reefs on a mass scale and decimated kelp forests and fisheries in various parts of the world. Such impacts have severe economic consequences for communities that rely on marine resources for their livelihoods. Warmer ocean surfaces also evaporate more heat and moisture into the air, intensifying tropical storms and loading them with heavier rainfall, leading to more destructive weather events.
The UK is bracing for its fifth heatwave of the year this week, with persistent dry weather putting further pressure on water supplies. This situation could lead to more areas being officially declared in drought. In Europe, sea surface temperatures in July reached record highs along the Atlantic coast and in the western Mediterranean, contributing to widespread strong and severe marine heatwaves. These regional extremes are consistent with the broader global trend of ocean warming.
Scientists predict that El Niño may temporarily push global temperatures even higher in the coming months. This forecast suggests that the current record-breaking temperatures may not be an isolated event but rather a precursor to even warmer conditions. The implications for Ghana include potential shifts in rainfall patterns, increased coastal erosion, and challenges for agricultural productivity. Monitoring these developments and implementing proactive measures will be crucial for national resilience.