Question

El Nino Southern Oscillation (ESNO)

ENSO three phases La Niña Conditions Normal Conditions El Niño Conditions 77 Con EGPE Girion Equslar- Equnlar Equmlar Termoen Thermoabre Termoabe 120°E

1- What is the ENSO?

A- a long period of trecherous weather in the Australia and India

B-A large scale cyclical disturbance in ocean and atmosphere conditions in the tropical Pacific Ocean, Which is related to major shifts in planetary-scake atnisogeruc abd iceab curcykatuibs.

C-A long period of fair weather in the tropical Pacific Ocean

D-A long period of treacherous weather in North America

2- Areas of high sea surface temperatures ( As inidated in red on the diagrams) are generally associated with ----

A- Increased atmospheric convection and rain

B-The El Nino phase only

C- Fiar weather

D- The doldrums

3- The inclination of the tropical Pacific thermocline (shown in dark blue in the diagrams) is steepest during the -----phase of the ENSO.

A-Stays the same throuhgout all phases

B-Neutral

C- La Nina

D- El Nino

4- The inclination of the tropical Pacific thermocline (shown in dark blue in these images) is "Flattest" during the -----phase of the ENSO.

A-El Nino

B-Styas the same throughtout all phases

C-La Nina

D-Neutral

5- El Nino (warm phase) of the ENSO occurs on average once every----generally last -----

A- 10-12 years.... 2-3 years

B- 1-2 years....2-3 months

C-3-7 years....12-18 months

Answer 1

1) B-A large scale cyclical disturbance in ocean and atmosphere conditions in the tropical Pacific Ocean, Which is related to major shifts in planetary-scake atnisogeruc abd iceab curcykatuibs.

ENSO is associated with both El Nino and La Nina events.

2) A- Increased atmospheric convection and rain

3) C- La Nina

During La Nina phase we have steepest thermocline and during El Nino phase we have the least steep thermocline.

4) A, El Nino

During El Nino phase we have the flattest thermocline.

5) C-3-7 years....12-18 months

During El Nino phase the normal condition reverses i.e. we get a higher temperature at Eastern Pacific and lower temperature at Western Pacific. That's why the wind blows from Western to Eastern Pacific and we get high rainfall at the eastern Pacific area i.e. at the American region.