Bissoy.com
Doctors Medicines MCQs Q&A

With reference to 'Indian Ocean Dipole (IOD)' sometimes mentioned in the news while forecasting Indian monsoon which of the following statements is/are correct? 1. IOD phenomenon is characterised by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean. 2. An IOD phenomenon can influence an EI Nino's impact on the monsoon. Select the correct answer using the code given below:

With reference to 'Indian Ocean Dipole (IOD)' sometimes mentioned in the news while forecasting Indian monsoon which of the following statements is/are correct? 1. IOD phenomenon is characterised by a difference in sea surface temperature between tropical Western Indian Ocean and tropical Eastern Pacific Ocean. 2. An IOD phenomenon can influence an EI Nino's impact on the monsoon. Select the correct answer using the code given below: Correct Answer 2 only

The correct answer is 2 only.

Indian Ocean Dipole (IOD)

  • It is the difference in sea surface temperature between two poles or areas (hence a dipole) i.e. an eastern pole in the eastern Indian Ocean south of Indonesia, and a western pole in the Arabian Sea (western Indian Ocean). Hence, statement 1 is not correct.
  • The IOD affects the climate of countries that surround the Indian Ocean Basin like India, Australia and others, and is a significant contributor to rainfall variability in this region. 
  • The IOD, in scientific terms, is a coupled ocean and atmosphere phenomenon, similar to El Nino–Southern Oscillation (ENSO) but in the equatorial Indian Ocean.
  • Through an extension of the Walker Circulation to the west and associated Indonesian throughflow (the flow of warm tropical ocean water from the Pacific into the Indian Ocean), it is thought that the IOD has a link with ENSO events.
    • Hence, negative IOD events are often associated with La Nina and positive events with El Nino. Hence, statement 2 is correct.

Related Questions

Consider the following statements regarding the difference between tropical and extra-tropical cyclones and choose the correct option from the alternatives given below: 1. Extra-tropical cyclones cover a larger area as compared to the tropical cyclones 2. Extra-tropical cyclones originate both over land as well as sea whereas tropical cyclones originate only over sea 3. The wind velocity in a tropical cyclone is much higher and destructive as compared to the extra-tropical cyclones
La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino ?
1. La Nina is characterised by un-usually cold ocean temperature in equatorial Indian Ocean whereas El Nino IS characterised by unusually warm ocean temperature in the equatorial Pacific Ocean.
2. El Nino has adverse effect on south-west monsoon of India, but La Nina has no effect on monsoon climate.
Which of the statements given above is/are correct?
What are the major differences between the physical and climatic conditions of the eastern and western Himalayas? 1. Western Himalayas receive most of the precipitation in the winter months and Eastern Himalayas in the summer months. 2. Western Himalayas are less in average latitude than the eastern Himalayas. 3. Snowline occurs at a higher altitude in Eastern Himalayas than in the Western Himalayas. Select the correct answer using the codes below.
Consider the following statements regarding the difference between Eastern and Western Himalayas and choose the correct options from the alternatives given below: 1. Western Himalayas are very dry where as Eastern Himalayas are wetter 2. Western Himalayas rise gradually in a series of ranges whereas Eastern Himalayas rises abruptly
Match List-I with List-II and select the correct answer using the code given below the Lists: List I (Low-Latitude Climate) List I (Characteristic) A. Wet Equatorial 1. Uniform temperatures, mean near 27°C  B. Monsoon and trade wind coastal 2. Marked temperature cycle with very high temperature before the rainy season C. Wet-dry tropical  3. Temperatures show an annual cycle with a high temperature in the high-Sun season Strong temperature cycle. with intense temperature during the high-Sun season  D. Dry tropical 4. Strong temperature cycle, with intense temperature during the high-Sun season
Which of the following statement is/are correct? Wrangel Islands is a part of Indian Ocean and is located in North of Russia. Arafura Sea lies west of the Pacific Ocean, overlying the continental shelf between Australia and Indonesian New Guinea. Java Sea is located in North of Java and is a part of Pacific Ocean. Select the correct code from below.
Consider the following statements: 1. The development of an El Niño brings drought to the western Pacific, rains to the equatorial coast of South America, and convective storms and hurricanes to the central Pacific. 2. El Nino and Indian monsoon are inversely related. 3. La Nina refers to the unusual warming of the central and east-central equatorial Pacific Ocean which affects global weather. Which of the statements given above is correct?
La Nina is suspected to have caused recent floods in Australia. How is La Nina different from El Nino? 1. La Nina is characterized by unusually cold ocean temperature in the equatorial Indian Ocean whereas El Nino is characterized by unusually warm ocean temperature in the equatorial Pacific Ocean. 2. El Nino has an adverse effect on the south-west monsoon of India, but La Nina has no effect on the monsoon climate. Which of the statements given above is/are correct? 
Which of the following statement is/are correct? Western Coastal Plain is bordered by the Pacific Ocean with a 2080 km coast and 12369 km shoreline. Pacific coastal plain is much narrower than the western coastal plain. California, Oregon and Washington lies along the Pacific coast. Select the correct code from below.
Consider the following statements regarding mangrove vegetation and choose the correct answer:
1. True mangrove vegetation occurs in open beach or in sandy or rocky shores of the sea
2. The vegetation rarely develops in wet tropics where the tropical rain forest is the climax vegetation
3. In world, the eastern mangrove is found on the coasts of Indian ocean and the western part of the Pacific ocean
4. Most of the species of mangrove formations are gregarious in habit