Why Is It So Hot? Understanding the Heatwaves

Introduction

The scorching heatwaves that have swept across the globe are not just a coincidence. They are a stark reminder of the impact of climate change. Let’s delve into why it’s so hot and what’s driving these extreme temperatures.

1. Climate Change and Greenhouse Gases

Earth’s average surface temperature has already risen about 2 degrees Fahrenheit since the late 19th century. This increase is primarily driven by greenhouse gas emissions that trap heat in Earth’s atmosphere. These gases, such as carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O), act like a blanket, preventing heat from escaping into space. As a result, our planet warms up, leading to more frequent and intense heatwaves.^

2. Record Ocean Temperatures

While we often focus on air temperatures, most of the heat stored near the Earth’s surface is actually in the oceans. This spring and summer, we’ve witnessed some record ocean temperatures. For instance:

• The North Atlantic is experiencing the highest surface water temperatures ever recorded. Around the UK, some coastal areas have seen temperatures as much as 5°C above normal for this time of year.
• The US National Oceanic and Atmospheric Administration (NOAA) has labeled it a Category 4 heatwave, a designation rarely used outside the tropics, signifying “extreme” heat.^

3. El Niño and Ocean Circulation

Simultaneously, an El Niño is developing in the tropical Pacific. El Niño occurs when warm waters rise to the surface off the coast of South America and spread across the ocean. This phenomenon affects global weather patterns, including heat distribution. With both the Atlantic and the Pacific experiencing heatwaves, it’s no surprise that global sea surface temperatures for April and May were the highest ever recorded since 1850.^

4. Unprecedented Heat

• The European Centre for Medium-Range Weather Forecasts reported that June 2023 was the hottest June on record globally.
• The three hottest days ever recorded occurred recently, with an average global temperature exceeding 17°C.
• These extreme highs align with climate models’ predictions, emphasizing the urgent need to address greenhouse gas emissions.^

Conclusion

We’re living in a period of unprecedented heat, and the evidence points directly to human-induced climate change. As we continue to burn fossil fuels, the consequences become more severe. It’s time to take action, reduce emissions, and protect our planet from further warming.^

Remember, the heatwaves we’re experiencing are not isolated events—they’re part of a larger pattern. Let’s work together to create a sustainable future and mitigate the impact of rising temperatures. 🌍🔥