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Critical Topics and Their Significance for the UPSC CSE Examination on September 26, 2024

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How global warming affects forecasting?

For Preliminary Examination:  Current events of national and international importance

For Mains Examination: GS III - Environment & ecology

Context:

Existing models cannot reproduce monsoon trends in the past half century and are considered unreliable for the future. Meteorologists will need to figure out if the predictability of natural modes such as hurricanes, El Niño, La Niña, and the Indian Ocean Dipole will decrease as the warming is relentless, if not accelerating

Read about:

What is global warming?

Global warming and it's effects

Key takeaways:

• The record-breaking warming witnessed in 2023-2024 offers a more vivid understanding of the impacts of global warming. This period has been marked by a series of extreme weather events across the globe, including intense heatwaves, powerful cyclones, severe floods, droughts, and widespread wildfires.
• Some estimates suggest that the world has already surpassed the 1.5º C warming mark, meaning that the earth's average surface temperature has risen over 1.5º C compared to pre-industrial levels. It's important to note that these global temperatures are based on a combination of actual data and climate modeling.
• Since the 1.5º C threshold is a key concern for the Alliance of Small Island Developing States, scientists have developed models to forecast the environmental disruptions that exceeding this limit could cause.
• However, there's still uncertainty about how long temperatures need to remain above this level for the expected effects to fully unfold.
• The extreme weather patterns seen in 2023-2024 also serve as a stark reminder of how challenging it is to predict weather and climate with the precision and detail necessary for effective disaster management. Unfortunately, loss of life, damage to property, and destruction of infrastructure continue to disproportionately affect vulnerable communities, especially those in poverty.

2024 Predictions and Realities

• While meteorologists correctly anticipated the 2023 El Niño in the spring, the intensity of warming in 2023-2024 exceeded expectations. Factors such as water vapor from the 2022 Hunga Tonga–Hunga Ha‘apai underwater volcanic eruption and carbon dioxide from wildfires may have intensified this warming.
• The 2023 monsoon was below average but didn't qualify as an El Niño drought, which researchers are still trying to understand. Forecasts that predicted a strong La Niña in late 2024 seem less likely to materialize, and other weather patterns, such as the cyclone season, have also behaved differently from expectations.
• This isn't merely a critique of prediction models but rather a call for caution and learning from this period of extraordinary warming. We must understand its implications for future forecasts and climate projections.

Challenges of Predicting the Climate

• The often-quoted saying, “Prediction is difficult, especially about the future,” holds true, especially in weather and climate forecasting. Despite improvements in models and observation networks, global warming might make predictions even more challenging. Are the unexpected weather patterns of this year an anomaly, or do they signal what lies ahead?
• Numerous studies have explored the effects of warming on natural phenomena such as hurricanes, monsoons, and El Niños. However, if the earth has already warmed beyond 1.5º C, can we draw any clear conclusions about how these patterns have adapted so far?
• Unfortunately, the recent warming hasn't lasted long enough for us to identify significant shifts in dominant climate trends confidently. While climate models are proficient at simulating natural patterns based on solar energy, they aren't flawless, often producing inconsistent results.
• For instance, current models struggle to accurately replicate monsoon trends over the past fifty years and remain unreliable for predicting future trends. This limitation highlights the need to address whether monsoon patterns fluctuate by decade or indicate genuine trends influenced by climate change.

The Future of Climate Predictions

While there’s optimism for the advancement of climate predictions, relying solely on hope isn’t a strategy. It’s crucial to enhance models and acknowledge their existing strengths despite certain shortcomings. We must determine whether the predictability of natural events like hurricanes and El Niños will diminish as warming accelerates. Researchers are working tirelessly to refine models, data networks, and technologies, including AI, to tackle this challenge.

There’s cause for optimism regarding more reliable and actionable early warnings on a local scale.

Lessons from 2023

Climate projections are currently based on models that factor in emissions, population growth, and mitigation strategies. For the next couple of decades, uncertainties in projections will stem from model limitations and natural climate variability. Beyond this period, uncertainties will primarily depend on hypothetical scenarios.

The challenge of capturing the influence of warming on natural patterns will continue to pose a problem for long-term climate projections. Focusing on improving weather and climate predictions is essential to refine these models. The most reliable approach might be to limit our projections to just a decade or two ahead, given the difficulty of predicting geopolitical, economic, and societal changes over a more extended timeframe

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