>Corrections to OIv2 SST Data For May 2009

>

Preliminary Notes: I’ve been downloading SST data for only a year, so I can’t say if changes are made often to the current month of OI.v2 SST data. But this month the OI.v2 SST data for May 2009 was changed sometime between June 1, 2009 and June 9, 2009. The corrections will mean little to the majority of my visitors, but for those who are doing research with OI.v2 SST data, you need to back and update your data.
#################

I ran a quick check to see if there was anything in the weekly OI.v2 SST data that could explain the recent jump in the South Atlantic SST anomalies, Figure 1, that I noted in the May 2009 SST Anomaly Update.
http://i39.tinypic.com/feiecj.jpg
Figure 1 – South Atlantic data on June 1, 2009

While the weekly data, Figure 2, did show higher than normal South Atlantic SST anomalies, (but not the highest on record, which occurred early in 2003) the recent multi-week decline did not agree with the continued rise in the monthly data.
http://i39.tinypic.com/29o1oyh.jpg
Figure 2 – Weekly South Atlantic data through June 3, 2009

So off to the monthly data I went. There I discovered that a change, assumedly a correction, had been made to the monthly OI.v2 SST anomaly data for the South Atlantic. And as noted above, the correction had been made sometime between June 1, 2009 and June 9, 2009. Refer to Figure 3. The drop in the May 2009 readings was almost 0.08 deg C, which is significant if you’re researching the South Atlantic.
http://i43.tinypic.com/24cy6nk.jpg
Figure 3 – Correction to monthly South Atlantic SST Anomaly Data

I have never seen a correction before in the OI.v2 SST dataset, but, then again, I haven’t looked for one. SST anomalies for Southern Hemisphere datasets appear to have dropped, while the Northern Hemisphere datasets rose. The changes in some of the datasets that I normally present in the monthly update were so small that they were not visible in comparative graphs. These included Global, Indian Ocean, and NINO3.4 SST anomalies. I have not presented them. The others are illustrated in the following without narrative. Some are quite significant.
http://i39.tinypic.com/etsn0o.jpg
Figure 4 – Correction to monthly South Pacific SST Anomaly Data
############
http://i44.tinypic.com/2n6hifk.jpg
Figure 5 – Correction to monthly Southern Ocean SST Anomaly Data
############
http://i44.tinypic.com/10ihr1l.jpg
Figure 6 – Correction to monthly Southern Hemisphere SST Anomaly Data
############
http://i41.tinypic.com/2vs5850.jpg
Figure 7 – Correction to monthly Northern Hemisphere SST Anomaly Data
############
http://i41.tinypic.com/33myiw4.jpg
Figure 8 – Correction to monthly North Atlantic SST Anomaly Data
############
http://i41.tinypic.com/2hoda8l.jpg
Figure 9 – Correction to monthly North Pacific SST Anomaly Data

SOURCE

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

Advertisements

About Bob Tisdale

Research interest: the long-term aftereffects of El Niño and La Nina events on global sea surface temperature and ocean heat content. Author of the ebook Who Turned on the Heat? and regular contributor at WattsUpWithThat.
This entry was posted in SST Dataset Info, SST Update. Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s