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TeachMeFinance.com - explain Southern Oscillation Index Southern Oscillation Index The term 'Southern Oscillation Index' as it applies to the area of the weather can be defined as ' A numerical index measuring the state of the Southern Oscillation. The SOI is based on the (atmospheric) pressure difference between Tahiti and Darwin, Australia. It is highly correlated with tropical sea surface temperature anomaly indices recorded in Niño'. The term 'Southern Oscillation Index' as it applies to the area of carbon dioxide can be defined as ' An indicator based on the pressure gradient between the quasi-stationary low pressure region and the center of a subtropical high pressure cell. A positive index corresponds to an anomalously high pressure difference between the two centers of action'. Previous 5 Terms: Source of contamination Source term Southern blotting Southern Dairy Compact Southern Oscillation Next 5 Terms: space Space Environment Center Space heating Spacing spadiceous About the author Mark McCracken Author: Mark McCracken is a corporate trainer and author living in Higashi Osaka, Japan. He is the author of thousands of online articles as well as the Business English textbook, "25 Business Skills in English". Copyright © 2005-2011 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.