Summary of Key Points
This article discusses the phenomenon of "typhoon mutation," emphasizing that the current increase in typhoons is not about a significant rise in their numbers, but rather a trend towards greater intensity, more intense rainfall, and more unpredictable paths. Climate change is the primary driving force behind these changes. Essentially, this is a concrete manifestation of climate anomalies in extreme weather events, which not only affect the natural environment but also have a chain reaction on economic life.
1. The Truth About Typhoon "Mutation": It's Not About More Typhoons, but More Ferocious and Unpredictable Ones
Many people perceive a "mutation" in typhoons, but this does not refer to an increase in their numbers; rather, it means that typhoons have become more violent and their behavior more erratic:
- Intensification: The proportion of super typhoons (with winds of 16 levels or higher) has significantly increased. For example, in the past 20 years, the proportion of super typhoons in the Northwest Pacific has risen from 15% to around 25%. Typhoons like "Hantek" and "Lekima," which can knock down roofs and trees, have become more common.
- Record-Rainfall: The amount of rain brought by typhoons has doubled. For instance, in 2021, Typhoon In-Fa caused unprecedented flooding in Henan, with rainfall equivalent to a month's normal amount in a short period. In 2023, Typhoon Doksuri set a century-long record for rainfall in Hebei.
- Unpredictable Paths: Typhoons used to follow relatively stable paths, but now they often make sudden turns, stop, or circle. For example, a typhoon that was intended to hit Guangdong might suddenly change direction and hit Fujian, catching authorities and defenders off guard.
2. How Climate Change Makes Typhoons More Ferocious
The intensification of typhoons is not random; climate change is playing a role in exacerbating the situation. The principles are simple:
- Warmer Sea Water: Typhoons rely on the evaporation of sea water to gain energy. Higher sea temperatures mean more water vapor being evaporated, providing more energy for the typhoon. Global ocean surface temperatures have risen by about 1°C compared to 100 years ago, providing each typhoon with additional fuel.
- Moister Air: Climate change makes the atmosphere hold more water vapor (for every 1°C increase in temperature, the atmosphere can hold 7% more water). When a typhoon passes, this excess water vapor turns into heavy rain, increasing both the intensity and duration of the rainfall.
- Disrupted Circulation: Climate change disrupts the normal patterns of atmospheric circulation (e.g., the position of subtropical high-pressure systems). Typhoons lose their stable guiding currents, behaving like cars without a navigation system, making them more prone to deviation or stagnation.
3. The Chain of Damage Caused by Extreme Typhoons
Extreme typhoons have far-reaching economic impacts:
- Agriculture: Crops are flooded, and fruit trees are damaged, leading to reduced yields or even total crop failures. For example, Typhoon Doksuri in 2023 caused severe damage to banana and tea plantations in Fujian and Zhejiang, resulting in price increases of 2-3 times in the short term.
- Urban Disruption: Floods cause subway closures and road congestion, leading to business closures. In Beijing in 2023, many offices had to close due to flooding, affecting work progress for internet companies.
- Insurance Pressure: Disaster payouts have soared. In 2023, Typhoon Doksuri resulted in insurance payouts exceeding 10 billion yuan, putting pressure on insurance companies, which may lead to higher premiums for property and agricultural insurance in the future.
- Supply Chain Disruptions: Ports are closed, and logistics are halted. For instance, the impact on Ningbo Port (a major global container port) caused delays of over a week, forcing foreign trade companies to pay additional fees and penalties.
4. What Can We Do to Cope with Extreme Typhoons?
While extreme typhoons cannot be completely avoided, we can take steps to reduce their impact:
- At the Individual Level:
- Pay attention to official warnings (such as weather apps and text messages) and avoid believing rumors.
- Prepare an emergency kit before a typhoon: water, non-perishable food, a flashlight, essential medications, and a power bank.
- Stay at home during a typhoon and avoid low-lying areas or the coast to prevent being struck by falling objects.
- At the Societal Level:
- Governments should improve infrastructure, such as building wider drainage systems, planting windbreaks, and reinforcing old buildings.
- Companies should develop emergency plans, such as moving raw materials in advance and stockpiling emergency supplies on e-commerce platforms.
- Everyone should contribute to reducing carbon emissions by driving less, saving electricity, and using renewable energy to slow down climate change and reduce the occurrence of extreme typhoons.
Extreme typhoons are a warning from climate change. They are not a result of "mutation" but an inevitable consequence of environmental changes. Only by taking action can we make future typhoons less destructive.