The Indian Ocean Dipole (IOD) : Recent Studies

1) Which of the following statements is/are correct in context of 'Indian Ocean Dipole'?

a) It is a system of oscillating sea surface temperatures.
b) It influences the monsoonal rainfall in temperate regions of the world.
c) Both a and b
d) Neither a nor b

2) Consider the following statements regarding 'Positive Indian Ocean Dipole' :

i) It occurs when the sea surface temperatures are greater than normal in the Arabian Sea.
ii) It occurs when the sea surface temperatures are less than normal in the tropical eastern Indian ocean.
iii) It leads to greater monsoon rainfall.

Which of the following statements is/are correct?

a) i and iii only
b) i and ii only
c) iii only
d) All of the above

3) Which of the following statements is/are incorrect with respect to effects of El-nino and IOD on Indian summer monsoon rainfall?

a) The effect of El-nino is to increase the monsoon rainfall.
b) The effect of negative IOD is to decrease the monsoon activity over India.
c) Both a and b
d) Neither a nor b

4) Recent studies indicate that 'early IOD' which peaks in the mid-monsoon months plays a significant role in enhancing monsoon rainfall. Which of the following geographical events leads to such an enhanced effect?

a) Arabian sea evaporation.
b) Strong cross equatorial flow.
c) Both a and b
d) Neither a nor b

Answers:

1) a , IOD influences the Indian summer monsoon rainfall which lies in tropical and sub tropical area.
2) d
3) a
4) c

Reference : The Hindu

Monsoon Forecast In India - India Meteorological Department ( IMD) And Related Issues

Part-1

1) The average annual rainfall received in India is :

a) 116 cm
b) 89cm
c) 100 cm
d) 106 cm

2) As per the latest forecast by IMD, monsoonal rainfall in India for the year 2016 would be:

a) 116 % of Long Period Average (LPA)
b) 106 % of Short Period Average
c) 106 % of Long Period Average (LPA)
d) 116 % of Short Period Average

3) Which of the following statements is/are correct regarding forecast parameters designed by the IMD ?

a) Rainfall between 96 -104 % of the LPA is considered ‘normal’.
b) Rainfall between 104 -110 % of LPA is considered ‘above normal’.
c) Rainfall between 90- 96 % per cent of LPA is considered ‘below normal’, and below that as ‘deficient’.
d) All are correct

4) Which of the following is not one of the predictors used by IMD for the April,2016 forecast?

a) Temperature difference between surface temperatures in the North Pacific and South Pacific ocean.
b) Surface temperature of the Indian Ocean near the equator.
c) Mean sea level pressure in the Pacific Ocean near East Asia.
d) Land temperatures over northwest Europe.
e) The volume of warm water in the equatorial Pacific Ocean.

5) What is the validity period for Long Range Forecasts?

a) Beyond 3 months
b) Beyond 6 months
c) Beyond 10 days
d) Beyond 9 months

6) The Long Period Average (LPA) refers to rainfall received over a period of :

a) 50 years
b) 10 years
c) 60 years
d) 100 years

Answers:

1) a
2) c
3) d
4) a, Temperature difference between surface temperatures in the North Pacific and North Atlantic ocean.
5) c
6) a, from 1951 to 2001

Reference : The Indian Express

----------------------------------------------------------------

Part-2

1) What is/are the impacts of favorable monsoons on Indian economy?

i) Moderating inflation rate
ii) Enhancing rural consumption
iii) Boosting sales of manufactured goods
iv) Improving electricity supply in some states.

a) i and ii only
b) ii,iii and iv only
c) i,ii,iii and iv
d) i and iii only

Answers

1) c , Reference : The Hindu