Suppose there is a rise in atmospheric temperature on Earth. How would this affect the cryosphere, hydrosphere and biosphere?
A rise in atmospheric temperature significantly impacts the cryosphere. It accelerates the melting of glaciers and polar ice caps. This adds more water to rivers, which may initially lead to the flooding of low-lying regions.
The hydrosphere is severely disrupted by this warming. Warmer sea water leads to more evaporation, causing fluctuations in the monsoon and variability in rainfall, bringing floods to some regions and droughts to others. In the long run, melting glaciers raise sea levels, threatening coastal cities like Mumbai and Chennai. Sudden intense rainfall also causes more runoff and less groundwater recharge.
The biosphere suffers greatly due to these interconnected changes. The variability in rainfall and reduced groundwater recharge makes sustaining agriculture difficult, especially during dry months. Furthermore, rising sea levels and habitat changes threaten coastal ecosystems and cause habitat loss for various living organisms.
Ultimately, a rise in temperature disturbs the delicate balance between the Earth's spheres. A change in the cryosphere and atmosphere directly alters the hydrosphere, which ultimately disrupts the biosphere, showing how deeply interconnected these systems are.
Explanation
The textbook context highlights the interdependence of Earth's spheres through Activity 13.1 and the water cycle. A temperature rise first affects the cryosphere by melting glaciers and polar ice. This meltwater enters the hydrosphere, raising sea levels and threatening coastal cities, while warmer seas alter evaporation and monsoon patterns, causing floods and droughts. These hydrosphere changes then impact the biosphere by making agriculture difficult due to poor groundwater recharge and causing habitat loss from rising sea levels and erratic rainfall.