CLIMATE OF INDIA
EL NINO AND SOUTHERN OSCILLATIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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El Nino poisons the fish
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El Nino causes strong winds and currents which move fish westward
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El Nino bring cold water to the surface which kills the base of the food chain
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El Nino shuts off upwelling and nutrients needed for the marine food chain do not rise to the surface
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Detailed explanation-1: -During an ENSO event, changes occur in the composition of the water along Peru’s coast. These include: increased sea surface temperature; cold coastal water confined to narrow band along the shore. salinity decreases (possibly due to increased rain)
Detailed explanation-2: -An El Niño reduces the upwelling of cold water off the coast of the Americas. When this happens, fish either die or migrate into areas where they’ll find more to eat.
Detailed explanation-3: -During El Niño, the water off the coast of Peru is warmer than usual. Without the cold, upwelled water, less phytoplankton can survive. And with less phytoplankton to eat, fewer anchovies can survive.
Detailed explanation-4: -Global changes associated with ENSO cause severe variations in the weather and climate around the coasts and oceans. Often, they have a profound impact on the biodiversity and humans, since floods, droughts, heat waves, and other shifts disrupt the ecosystem of the region.