No evidence of global warming effect on El Nino and La Nina anomalies from 1871 to 2008, Nov. 8, 2012 paper, Journal of Geophysical Research

10/29/12, published Nov. 8, 2012, “JOURNAL OF GEOPHYSICAL RESEARCH,” VOL. 117.

 
“Historical changes in El Nino and La Nina characteristics in an ocean reanalysis”

Key Points

• No evidence of changes in El Nino frequency caused by global warming
• Absence of an unique mean location of La Nina
• El Nino in reanalysis correlates better with El Nino in ERSST

Sulagna Ray, Department of Oceanography, Texas A&M University, College Station, Texas, US, LOCEAN/IPSL, UPMC, Paris, France; Benjamin S. Giese, Department of Oceanography, Texas A&M University, College Station, Texas, USA

The variation of El Niño Southern Oscillation (ENSO) events from the mid-nineteenth century until the beginning of the twenty-first century is explored using an ocean reanalysis. A comparison of the reanalysis with three sea surface temperature reconstructions shows that the timing of events is similar in all four products, however there are important differences in the strength and location of events. The difference between the reconstructions is sometimes larger than the difference between the reanalysis and a given reconstruction. These differences are larger in the first half of the record, a period for which there are relatively sparse observations. The reanalysis is used to explore decadal variability and trends in the frequency, duration, and propagation direction of ENSO events. There is considerable decadal variability of these ENSO characteristics with the time between events ranging from several months to ten years and the duration of ENSO varying from 5 to 27 months.

As has been previously shown for the strength and location of ENSO there is little overall trend in the characteristics. Having a three dimensional representation of the ocean from the reanalysis allows exploration of subsurface changes during ENSO. An analysis of subsurface anomalies shows that during ENSO events the subsurface anomalies are highly correlated with the strength of surface anomalies over the 140 year period.

Overall, there is no evidence that there are changes in the strength, frequency, duration, location or direction of propagation of El Niño and La Niña anomalies
caused by global warming during the period from 1871 to 2008.” via Hockey Schtick, 11/7/12, “Climate alarmists confounded again: New paper finds no effect of global warming on El Ninos,” via Climate Depot





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