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Monday, August 2, 2010

No Preliminary SST Data For July 2010---Yet

I’ve moved to WordPress.  This post can now be found at No Preliminary SST Data For July 2010—Yet
With the start of the new month, I would normally be posting the preliminary OI.v2 Global and NINO3.4 SST anomalies for July today. Unfortunately, the NOAA NOMADS system hasn’t presented the preliminary July values as they normally do by mid-morning on the Monday that’s one week before the official values are released. The weekly values have been updated, so I’ll provide a quick update of those. I thought it might be interesting to compare this La Niña so far to other significant events.

The weekly global SST anomalies (centered on Wednesdays through July 28, 2010) are continuing their wiggly decline and have reached +0.21 deg C.
Weekly Global SST Anomalies

Weekly NINO3.4 SST anomalies are well into La Niña ranges, and are at -1.31 deg C.
Weekly NINO3.4 SST Anomalies

The rate at which the NINO3.4 SST anomalies have been dropping is not out of the ordinary...yet. In the next graph, NINO3.4 SST anomalies for 2010 are compared to 1988, 1998, and 2007, years of significant La Niña events.
La Niña Evolution For Four Events


Weekly Reynolds OI.v2 SST anomaly data is available through the NOAA NOMADS website:


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Mike M. said...

The dive looks rather...steep. Please refresh our memories. When was the strongest La Nina event ever recorded?

Bob Tisdale said...

Mike M: Based on the HADISST data, the lowest NINO3.4 SST anomaly was -2.44 deg C during the 1889/90 La Nina.

John said...

Hi Bob -

Any opinion on Dr. Roy's post about the divergence between Nino 3.4 and global SSTs?


Is it because there was a Nino which transmitted heat elsewhere in the global SSTs, which did not happen at any other point in the record from the Aqua satellite?

Just checking.



Bob Tisdale said...

John: You asked, "Any opinion on Dr. Roy's post about the divergence between Nino 3.4 and global SSTs?"

That one's tough to speculate about since there are no comparable El Nino events in the period. Would there also have been a lagged response to the earlier El Nino events of the same size? Unfortunately that satellite has only been spitting out SST data since 2002 so we don;t know.


Pascvaks said...

I know you prefer to stick with current data, but have you found anyone on the web more 'enlightened' than most on paleoclimate matters relating to ENSO?

Bob Tisdale said...

Pascvaks: I don't recall running into any bloggers with a background in paleo ENSO data. Michael Mann did a study a while back and did a lousy job of splicing instrument data to his reconstruction--didn't bother to scale it, though the scales were obviously different.


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