Posted on 01/13/2011 9:01:58 PM PST by Ernest_at_the_Beach
Back on August 6, 2010, when the UK BOM was predicting a warm winter, and every Met Agency in the West was already declaring that 2010 would be the hottest year ever, Bryan Leyland predicted (on a global scale) that before the end of the year, there would be significant cooling. As you can see from the chart, this is exactly what happened.
The UK Met Office has a gigantic supercomputer, 1,500 staff and a £170m-a-year budget, but a retired engineer in New Zealand armed only with Excel and access to the internet and with the McLean is et al 2009 paper, was able to get it right.
Parking the SOI index (the blue line) 7 months into the future suggests things may get cooler still as the temperature (red line) often follows the trend. (Click for a larger image.) Note, the SOI is shifted 7 months forwards in time, and the scale is inverted.
Before anyone scoffs that the El Nino’s are usually followed by cooling, and the SOI indicator is well known, ponder that the well fed agencies of man-made-climate-fame weren’t telling the public that a big-chill was on the way and they ought to stock up on salt and red diesel. (And maybe take their own deicing fluid to the airport.*)
Bryan wrote to me to make another prediction: “world temperatures will remain cool until June at least. Whether or not this is the beginning of sunspots induced long term cooling remains to be seen. But there is no doubt that the present La Nina has been quite long already and is quite intense.”
The link between the Southern Oscillation Index (SOI) and temperatures is impressive, though, not perfect. The SOI scale is inverted and shifted 7 months into the future to make it easier on us mortals to see the link.
The reason the SOI is so influential is the sheer volume of heat content on-the-move. The cold waters of the deep dark abyss, have snuck up near the surface to steal heat from the ephemeral air. In a post last June, William Kininmonth explains how the whole planet could suddenly “get warmer” during an El Nino, and then suddenly cool again. The ocean floor holds 3km of close-to-freezing water covering 70% of the planet.
Southern Oscillation Index (SOI), Global Temperatures 2000 -2010. (Click for a larger image)
I asked John McLean about the current SOI level, and he replied:
“The Southern Oscillation Index (SOI) value for December of +27 is the highest December SOI value on record, as well as being the highest value for any month since November 1973.” From BoM “ENSO wrap-up” webpage.
On the SOI archive webpage I can’t see any similar sustained strong La Nina conditions since 1917, at which time 3 months (Jul, Aug, Sep) were all greater than +27.1 (respectively 28.3, 34.8, 29.7). The only other months when this figure was exceeded are April 1904 (+31.7) and Nov 1973 ((+31.6).
The last 6 months (Jul-Dec 2010) have all high positive SOI’s and this is surpassed only by 1917, which had SOI greater than +8 in 11 months of the year (Feb-Dec) and it continued into the first 3 of 1918. (An SOI of +8 regarded as the La Nina threshold is exceeded for 3 months).
According to the BoM’s data since 1900, the annual average mean temperature anomaly in 1917 was the coldest. (See this BOM page.)
According to the HadCRUT3 dataset, the annual average temperature anomaly for 1917 was -0.507 deg C, putting it within 0.1 degrees of the coldest year since 1850 (i.e. 1911 at -0.582).
Ever wondered how the whole planet could suddenly “get warmer” during an El Nino, and then suddenly cool again? William Kininmonth has the answer. The deep oceans drive the atmosphere.
*Yes, I do realize that the SOI doesn’t predict the weather at Heathrow.
UPDATE
Richard at the Climate Conversation (NZ) has also written about Leylands SOI Graph.
fyi
Excellent! Bookmarked, shared on Face Book.
I figured that all in my head, without a computer.
Bookmark
Bump.....
You must not have smoked a bunch of dope like Al Gore.
AE: All brontosauruses are thin at one end, much MUCH thicker in the middle, and then thin again at the far end. That is the theory that I have and which is mine, and what it is too.
Hat tip to the Montys and the Pythons.
I don’t care about processing power, GIGO!
I don’t care about processing power, GIGO!
Normally during a La Nina or neutral state the solar warmed equatorial Pacific waters flow westward until they reach land then turn and head away from the equator. These flows normally keep the waters around Japan and Eastern Australia warm. The heated waters also experience down welling into the deeper ocean. So the deep oceans and oceans located at mid to high latitudes have some of their heat input cutoff during an El Nino. This means you can have the atmosphere and the shallow water oceans warm (El Nino), while the deep ocean cools because it receives less heat input. Resulting in no net positive or negative anomaly in total biospheric heat content.
So that means in a normal non-super El Nino or La Nina, there is no net change in Total Heat Content of the Biosphere. So running around screaming like Chicken Little while an El Nino is occurring is an exercise in futility, as we have just discovered. That El Nino atmospheric heat is gone. Long gone. Now we are under the short term influence of La Nina, which means you can kiss atmospheric summer conditions good bye in 2011. The long term solar trend right now is cooling. The PDO is in cold mode. And we are over due historically for an Ice Age.
should read
This means you can have the atmosphere and the shallow water oceans warm (El Nino), while the deep ocean and high-latitude ocean cools because it receives less heat input.
Precisely
Did they mix up the SOI and Temp lines on that graph?
They say “Temps (red) lag SOI (blue) by 7 months”, but I see the red line ahead of the blue one.
Confused?
Wind patterns and upwellings make a big difference here. In the offshore winds the warmer surface water is driven offshore and the cool deep water rises to the top to replace it.
The atmosphere is cooling, while the deep ocean is warming. In basic terms, the atmospheric air conditioning is on.
Neat. We get it here in Fla in the summer when there is a lot of offshore wind.
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