Books & Magazines

Prahaar (Mains Wallah)

Mains Wallah (Q&A Bank)

Budget & Economic Survey

Monthly Current Wallah

Weekly Current Wallah

Editorial Summary

Editorial Q&A Compilation

NCERT Wallah

Marks Booster

Udaan 500+

Udaan

Prelims Wallah (Q&A Bank)

UPSC PYQs

UPSC Notes

CA & Editorials

Daily Current Affairs

Subject Wise Current Affairs

Editorial Analysis

Other Resources

Current Affairs

Indian Ocean Dipole (IOD)

Indian Ocean Dipole (IOD)

PWOnlyIAS

August 24, 2023

Context:

  • Recently, Australian Bureau of Meteorology has reported a shift in the Indian Ocean Dipole (IOD) index in recent days.
    • The IOD index has increased from +0.34°C to +0.79°C, surpassing the positive IOD threshold of +0.4°C.
    • Last Positive IOD event occurred in 2019.

24.4

About Indian Ocean Dipole (IOD):

  • IOD signifies the fluctuation in sea-surface temperatures from warm to cool in the Indian Ocean area south of Sri Lanka. 
  • The IOD is defined by the difference in sea surface temperature between western Indian Ocean and eastern Indian Ocean south of Indonesia. 
  • The IOD affects the climate of Australia and other countries that surround the Indian Ocean Basin, and is a significant contributor to rainfall variability in this region.

About IOD index:

  • IOD index is defined as the difference between the mean sea surface temperature in the western Indian Ocean and mean sea surface temperature in the eastern Indian Ocean.
  • When the IOD index is positive, the phenomenon is referred to as the positive IOD and when it is negative, it is referred to as the negative IOD.
Positive IOD Negative IOD
  • Warmer sea surface temperatures in the western Indian Ocean relative to the east.
  • Indonesia and Australia tend to be drier than normal, which increases the chances of bushfires, while eastern Africa tends to be wetter than normal, increasing the likelihood of floods.
  • It helps rainfall along the African coastline and also over the Indian subcontinent.
  • Positive IOD event is known to help the South-West monsoon.
  • Cooler sea surface temperatures in the western Indian Ocean relative to the east.
  • Winds become more westerly, bringing increased cloudiness to Australia’s northwest.
  • Indonesia and Australia tend to be wetter than normal, while eastern Africa tends to be drier than normal.

News Source: Hindu BL 

Print Friendly, PDF & EmailDOWNLOAD PDF

To get PDF version, Please click on "Print PDF" button.

Print Friendly, PDF & EmailDOWNLOAD PDF

Recent Editorial

How India’s Development-Centric Approach to Cent...

Maternity Benefits Integral to Right to Life, Heal...

Recounting Velpur’s Story in Ending Child Labour

Urbanisation and the Challenge of Ideal Transit So...

Understanding Human Values: Moral Compass, Life Di...

Engineering Humanity & Where to Draw a Line

Popular current affairs

Israel-Iran Conflict Escalates: Operation Rising L...

UN Ocean Conference 2025: Global Call to Protect O...

13-Billion-Year-Old Cosmic Dawn Signal Detected by...

National Conference on Agri Stack 2025

Study On Online Child Sexual Abuse In Karnataka

News in Shorts: 14 June 2025

Our Courses

Our Courses

Need help preparing for UPSC or State PSCs?

Connect with our experts to get free counselling & start preparing

Aiming for UPSC?

Download Our App

# #

Download Our App

# #

Contact Details

Copyright © 2025 PWOnlyIAS
Privacy Policy Terms & Condition

Aiming for UPSC?

Download Our App

# #
      

Follow Us:

Contact Details

Download Our App

# #
Copyright © 2025 PWOnlyIAS
Privacy Policy Terms & Condition
Quick Revise Now !
AVAILABLE FOR DOWNLOAD SOON
UDAAN PRELIMS WALLAH
Comprehensive coverage with a concise format
Integration of PYQ within the booklet
Designed as per recent trends of Prelims questions
हिंदी में भी उपलब्ध
Quick Revise Now !
UDAAN PRELIMS WALLAH
Comprehensive coverage with a concise format
Integration of PYQ within the booklet
Designed as per recent trends of Prelims questions
हिंदी में भी उपलब्ध

<div class="new-fform">






    </div>

    Subscribe our Newsletter
    Sign up now for our exclusive newsletter and be the first to know about our latest Initiatives, Quality Content, and much more.
    *Promise! We won't spam you.
    Yes! I want to Subscribe.