I'll show plots below the jump. SST has been settling gradually following the El Nino, and in May, the ERSST index dropped from 0.411 to 0.383°C, on an anomaly base of 1981-2010.
So first, here is a snapshot of the active plot. It shows a comparison with NOAA ocean, and HADSST3. It is very close to the NOAA index, as one would expect. It is integrating the same data, so the differences (which I have been working to reduce) are methodological.
![](https://s3-us-west-1.amazonaws.com/www.moyhu.org/2016/06/ERSST1.png)
To show how close I have been able to get to the NOAA index historically, here is a plot of the two going back to 1961, with differences. As mentioned in my earlier post, I think the differences are primarily in treatment of sea ice, and the later NOAA index uses information not currently available for May 2016. Also the agreement shown is between the values as they now are in the dataset; the values first posted are revised late in the month.
![](https://s3-us-west-1.amazonaws.com/www.moyhu.org/2016/06/ERSST2.png)
The ERSST index will be available in the trend viewer after the next run ( a few hours hence). Soon I'll show some regional divisions (NH, SH, Tropic etc).
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