Preliminary October 2009 OI.v2 SST Anomaly Data Appears To Have An Error

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Figure 1 shows the time-series plot of the Preliminary (Unofficial) Global OI.v2 SST Anomaly data through October 2009. The preliminary October 2009 data was posted on NOMADS yesterday, October 26, 2009. The official release is not scheduled until November 9, 2009. The new data shows an upward swing for October. This is likely an error, so I wanted to illustrate it just in case there are claims about a new record Northern Hemisphere SST anomaly for October.

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Figure 1 – Preliminary October 2009 Global SST Anomalies

A look at the Southern Hemisphere data, Figure 2, shows a continuation of the decline over the past few months, though the drop looks a little steep.
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Figure 2 – Preliminary October 2009 Southern Hemisphere SST Anomalies

Then, obviously, the increase must be in the Northern Hemisphere, Figure 3. As you will see, this rise does not appear in the weekly Northern Hemisphere data, so it is likely an error.
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Figure 3 – Preliminary October 2009 Northern Hemisphere SST Anomalies

The sudden rise in Northern Hemisphere wasn’t prompted by a rise in NINO3.4 SST anomalies, Figure 4, because they didn’t increase appreciably in October.
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Figure 4 – Preliminary October 2009 NINO3.4 SST Anomalies

HAVE SOME SEPTEMBER READINGS CARRIED OVER INTO THE OCTOBER DATASET?
DUNNO.
One thing is certain; the weekly data through October 21, 2009, which is official, DOES NOT SHOW THE RISES that are being presented in the preliminary Northern Hemisphere and Global SST anomaly data. Refer to Figures 5 through 8.
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Figure 5 – Weekly Global SST Anomalies Through October 21, 2009
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Figure 6 – Weekly Southern Hemisphere SST Anomalies Through October 21, 2009
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Figure 7 – Weekly Northern Hemisphere SST Anomalies Through October 21, 2009
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Figure 8 – Weekly NINO3.4 SST Anomalies Through October 21, 2009

NOTE: The weekly NINO3.4 SST Anomalies are above 1 deg C for the first time this year.

SOURCE

OI.v2 SST data is available through the NOAA NOMADS website:
http://nomad3.ncep.noaa.gov/cgi-bin/pdisp_sst.sh?lite=