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State PCS

Sambhav-2023

  • 02 Mar 2023 GS Paper 3 Bio-diversity & Environment

    Day 98
    Question 1: Discuss the ocean acidification. How will it impact the marine biodiversity? (150 words)

    Question 2: How climate change and ozone depletion are interlinked? Discuss why the ozone depletion is maximum at antarctica? (150 words)

    Answer 1

    Approach

    • Give a brief introduction about ocean acidification.
    • Discuss the impact of ocean acidification on marine biodiversity.
    • Write a comprehensive conclusion.

    Introduction

    • Ocean acidification is the ongoing decrease in pH of the Earth's ocean water, caused by the absorption of carbon dioxide (CO2) from the atmosphere.
    • When CO2 dissolves in seawater, it forms carbonic acid, which increases the acidity of the water.
    • This process of ocean acidification has been ongoing for several decades and is primarily driven by the burning of fossil fuels, which releases large amounts of CO2 into the atmosphere.

    Body

    • The increasing acidity of the oceans has significant consequences for marine ecosystems and the organisms that depend on them.
      • Shell formation: Many marine organisms, such as mollusks, corals, and some species of plankton, rely on calcium carbonate to build their shells or skeletons. However, in more acidic seawater, calcium carbonate becomes less available, making it difficult for these organisms to form and maintain their shells. This can lead to weakened or deformed shells, reduced growth, and even death.
      • Food chain disruption: Ocean acidification can affect the food chain in complex ways. Some species of plankton, for example, are the base of the marine food chain and are essential for the survival of many other species. If they are unable to form their shells due to acidification, they may be unable to reproduce, leading to a decline in their population and impacting the entire food chain.
      • Fish behavior: Ocean acidification can also impact the behavior of fish. Studies have shown that increased acidity can affect the ability of fish to detect predators or locate food, potentially leading to a decline in their population.
      • Biodiversity loss: Ocean acidification can also lead to a decline in overall marine biodiversity. Some species may be more sensitive to changes in pH levels than others, leading to a loss of species diversity in affected areas.
      • Coral bleaching: Coral reefs are particularly vulnerable to ocean acidification. Increased acidity can cause coral to bleach, which means they lose their colorful algae and become white. Bleached corals are more susceptible to disease and are less able to provide habitat and protection for many other species.

    Conclusion

    Ocean acidification is a significant threat to marine biodiversity. The impacts of acidification can be felt across the food chain, leading to weakened shells, disrupted behavior, and the potential loss of species. It is essential to reduce carbon emissions and take other steps to protect marine biodiversity and ensure a sustainable future for our oceans.


    Answer 2

    Approach

    • Give a brief introduction about the linkage of ozone depletion and climate change.
    • Describe the reason for more depletion of the ozone layer at antarctica.
    • Write a comprehensive conclusion.

    Introduction

    • Climate change and ozone depletion are two separate but interconnected environmental problems. Human activities, such as the use of fossil fuels and chemicals, contribute to both issues.
    • Greenhouse gas emissions from burning fossil fuels trap heat in the atmosphere, causing the planet to warm and leading to the formation of ozone-depleting chemicals.
    • Many of the chemicals that are responsible for ozone depletion, such as chlorofluorocarbons (CFCs), are also potent greenhouse gasses and these gases are the important factors for climate change.
    • The depletion of the ozone layer can also have an impact on climate. The ozone layer absorbs ultraviolet (UV) radiation from the sun, which heats up the stratosphere.
    • Changes in wind patterns and temperature caused by climate change can affect the distribution and breakdown of ozone-depleting chemicals.
    • Warmer temperatures in the lower atmosphere can create conditions that promote the formation of polar stratospheric clouds, which are involved in the breakdown of ozone-depleting chemicals.
    • Addressing both issues requires a concerted effort to reduce greenhouse gas emissions and phase out the use of ozone-depleting chemicals.

    Body

    • The ozone depletion is maximum at Antarctica due to a combination of unique atmospheric and meteorological conditions that create a favorable environment for the formation of the so-called "ozone hole". Here are some key factors that contribute to the maximum ozone depletion in Antarctica:
      • Polar vortex: During the winter months, a polar vortex forms over Antarctica, which isolates the region from the rest of the world and traps cold air within it. This creates the perfect conditions for the formation of polar stratospheric clouds, which are made up of tiny ice crystals that can react with ozone-depleting chemicals such as chlorofluorocarbons (CFCs) to release chlorine molecules. These chlorine molecules then break down ozone molecules in the atmosphere, leading to the formation of the ozone hole.
      • Low temperatures: The extreme cold temperatures in Antarctica create a stable atmospheric environment, which prevents the mixing of air between the lower and upper layers of the atmosphere. This means that the ozone-depleted air is trapped near the surface, leading to a concentration of ozone depletion in the region.
      • Ozone destruction reactions: The combination of polar stratospheric clouds, low temperatures, and the presence of ozone-depleting chemicals leads to a series of chemical reactions that destroy the ozone layer. The chlorine molecules released from the breakdown of CFCs react with ozone molecules, breaking them down into oxygen molecules and preventing them from absorbing harmful UV radiation from the sun.
      • Seasonal variation: The maximum ozone depletion occurs during the Antarctic spring (September to November) when the sun returns to the region after several months of darkness. The increased UV radiation at this time accelerates the ozone destruction reactions, leading to the formation of the ozone hole.

    Conclusion

    Human activities releasing gasses like CFCs into the atmosphere are causing both climate change and ozone depletion, which are interconnected issues. Therefore, it is essential for individuals and governments to take decisive action to reduce the emissions of ozone-depleting gasses and mitigate the impacts of climate change to secure a sustainable future. The maximum ozone depletion at Antarctica is the result of a complex interplay between atmospheric and meteorological conditions, as well as the presence of ozone-depleting chemicals. Despite international efforts to phase out the production and consumption of ozone-depleting substances, the reduction of the ozone hole size in recent years, and ongoing monitoring, continued actions are necessary to fully recover the ozone layer in the future.

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