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One Plausible Reason for the Change in Enso Characteristics in the 2000S : Volume 10, Issue 4 (01/07/2013)

By Stepanov, V. N.

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Book Id: WPLBN0004020767
Format Type: PDF Article :
File Size: Pages 34
Reproduction Date: 2015

Title: One Plausible Reason for the Change in Enso Characteristics in the 2000S : Volume 10, Issue 4 (01/07/2013)  
Author: Stepanov, V. N.
Volume: Vol. 10, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Stepanov, V. N. (2013). One Plausible Reason for the Change in Enso Characteristics in the 2000S : Volume 10, Issue 4 (01/07/2013). Retrieved from

Description: Dept. of Meteorology, University of Reading, Reading, UK. It is well known that El Niño Southern Oscillation (ENSO) causes floods, droughts and the collapse of fisheries, therefore forecasting of ENSO is an important task in climate researches. Variations in the equatorial warm water volume of the tropical Pacific and wind variability in the western equatorial Pacific has been considered to be a good ENSO predictor. However, in the 2000s, the interrelationship between these two characteristics and ENSO onsets became weak. This article attempts to find some plausible explanation for this.

The results presented here demonstrate a possible link between the variability of atmospheric conditions over the Southern Ocean and their impact on the ocean circulation leading to the amplifying/triggering of ENSO events. It is shown that the variability of the atmospheric conditions upstream of Drake Passage can strongly influence ENSO events. The interrelationship between ENSO and variability in the equatorial warm water volume of the equatorial Pacific, together with wind variability in the western equatorial Pacific has recently weakened. It can be explained by the fact that the process occurred in the Southern Ocean recently became a major contributor amplifying ENSO events (in comparison with the processes of interaction between the atmosphere and the ocean in the tropics of the Pacific). Likely it is due to a warmer ocean state observed from the end of the 1990s that led to smaller atmospheric variability in the tropics and insignificant their changes in the Southern Ocean.

One plausible reason for the change in ENSO characteristics in the 2000s

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