Question

Which of the following is NOT an indicator of an ongoing El Nino event? A) Lower than average pressure in the Eastern Tropical Pacific. B) Stronger than average easterly winds in the Eastern Tropical Pacific. C) Warmer than average temperatures in the Eastern Tropical Pacific. D) Higher than average thunderstorm activity in the Central and Eastern Tropical Pacific. E) Shallower than average thermocline in the Eastern Tropical Pacific

Answer 1

Answer: A: Lower than average pressure in the Eastern Tropical Pacific

Step-by-step explanation:

- High pressure coastal South America weakens

- Reduces the pressure difference - reduce trade winds

- - warm water pool spreads along equator (September; reaches South America by December / January)

- Precipitation centre also moves

- Thermocline flattens out

- Peru: Weak or no upwelling