The NOAA Weekly ENSO Sea Surface Temperature Indices Webpage Has Changed Location

There has been concern expressed recently around the blogosphere that NOAA hasn’t updated their weekly El Niño-Southern Oscillation (ENSO) sea surface temperature-based indices webpage since May 16, 2012. I use the NOAA NOMADS website (alternate NOAA computer here) for my sea surface temperature updates so this didn’t present any difficulties for me. It did, however, cause problems for the WattsUpWithThat ENSO meter, since it had been linked to that NOAA SST indices webpage. To remedy that problem, the WUWT ENSO meter is now updated from an Australia Bureau of Meteorology webpage here.

What happened to the NOAA weekly updates?

NOAA changed climatologies (base years for anomalies) from 1971-2000 to 1981-2010 and provided a new webpage, which is currently up to date. The standard climatology for the Reynolds OI.v2 sea surface temperature anomalies continues to be 1971-2000, and that’s what the NOMADS and BOM use. As a result, there will be differences between the anomalies on the NOAA indices webpage and on the NOMADS and BOM webpages.  And since the NOAA Oceanic NINO Index (ONI) now uses a sliding series of 5-year climatologies (see here), it won’t agree with any of them.

Through a link on their Monthly Atmospheric & SST Indices webpage, NOAA explains the reason for the change in base years on a webpage titled Climate Diagnostics Bulletin Updates to Climatologies and Indices Beginning with January 2011 Data:

Beginning with the January 2011 monthly data, all climatologies, anomalies, and indices presented within and related to the monthly Climate Diagnostics Bulletin will be updated according to current WMO standards. For datasets that span at least the past 30 years (such as atmospheric winds and pressure), the new anomalies will be based on the most recent 30-year climatology period 1981-2010.

Well, there it is.

For those monitoring the weekly NOAA ENSO SST indices webpage, don’t forget to update your favorites with the new webpage.

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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 El Nino-La Nina Processes, SST Update. Bookmark the permalink.

2 Responses to The NOAA Weekly ENSO Sea Surface Temperature Indices Webpage Has Changed Location

  1. James Reid (from Arding) says:

    Hi Bob,

    No doubt you are aware of this paper but I thought I would give you a heads up in case you hadn’t seen it.

    http://www.nature.com/nclimate/journal/vaop/ncurrent/full/nclimate1600.html

    I am still working through your book to try to better understand ENSO so this paper is still above my pay grade.

    Cheers
    James

  2. Bob Tisdale says:

    James: Thanks for the link. I hadn’t some across it yet.

    Regards

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