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PDO and AMO as the Real Pacemakers for Climate Cycles
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02/17/2009 07:16 PM
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[link to icecap.us]
Icecap Note: this is the PDO+AMO versus US annual temperature
IceCap/What's New & Cool
February 17, 2009
By Matt Vooro
Icecap Note: In numerous stories here on Icecap, we have dicussed the
importance of the PDO and AMO in decadal scale climate changes. We
have noted how the recent warm PDO and AMO led to the warming
attributed by the opportunists at the UN, in the universities and
professional societies to anthropogenic greenhouse fording. in this
excellent summary submitted to a newspaper by Matt Vooro of
Scotland, we see clear evidence for the PDO and AMO’s role in climate
in the US, Canada and globally. It was in response to the article by
Vicky Pope of the UKMO entitled “SCIENTISTS MUST REIN IN
MISLEADING CLIMATE CLAIMS”.
I totally agree that scientists should refrain from making misleading
climate change claims. I think the whole issue that climate change is
primarily caused by manmade greenhouse gases is misleading .
Natural earth/ocean climate cycles like PDO and AMO are not even
talked about by these same alarmists. IPCC climate models are
strangely silent on them too. Now I wonder why? How can one trust
any climate models that omit the key climate drivers.
The Pacific and Atlantic Ocean temperature oscillations as measured by
the PDO and AMO indices are prime drivers of our climate. The
droughts, hot spells, rainy weather and cold spell all have their origins
in the temperature oscillations of these ocean climate makers that
have existed for thousand of years and explain the natural variability of
the global climate. The paper here well illustrates this point.
With the PDO now negative[since 2007] and AMO still positive, we are
today where we were about 1945 -1950[ PDO went negative then in
1944] and heading for possible 30 years of cooler weather. Yes, there
will be some warm years too, but the overall trend of the period will be
cool. Yet why are the climatologists all over the world predicting
unprecedented global warming, while the weather is actually cooling
and has done so for many years now. Here are just a few examples of
how PDO and AMO affect our climate. At least 52% of all the droughts
in the US are attributable to PDO and AMO effects and not to global
warming at all.
PDO and AMO both positive [like 1925-1945] and [1995 -2007]
Record warm and rising temperatures and droughts in the northern
and central high plains US, California, and Southeast. The very hot spell
and dust bowl of the 1930�s. Also explains the so called rapid global
warming period of 1976-2007 [not caused by CO2 at all].
PDO negative, AMO positive [like 1945-1965] and [near term future for
Cold temperatures in the northwest, Canada. Droughts in southwest.
Pattern is like the 1950 drought with major issues in the Midwest,
southwest, California, Rocky Mountain area. A repeat of this period
may have already started in 2007
PDO and AMO both negative [like 1965 -1975] and again [1915-1925]
Record Cold temperatures. Lot of snow and precipitation.Very few
droughts, restricted to central plains. This could be the pattern in a
few years and the latter part of the next 30 years.
PDO positive, AMO negative [like 1895-1925 and again [1975-1995]
Warming. Restricted drought to Pacific NW and Northeast
Here is how AMO and PDO seem to affect the rest of the world:
AMO seems to affect the east coast more. Ten of the coldest
temperatures for the Atlantic Canada between 1948 -2008 happened
when the AMO was negative. PDO affects the rest of CANADA more but
especially the west coast. Nine of the 10 coldest years between 1948-
2008 happened when PDO was negative [like now]. The average for all
of Canada is 8 of the coldest 10 years between 1948 and 2008 were
when the PDO was negative and 8 of the warmest were when the PDO
was positive. So the PDO is one of the main weather makers for
Canada as a whole except for perhaps Quebec and the Maritimes.
Global record temperatures were set during 2005 and the 1997/1998
periods when both the AMO and PDO were positive and at record
levels: In 2005, PDO peaked at 1.86 AMO peaked at 0.503 [13th
highest] and in 1997/1998, the PDO peaked at 2.82 and AMO was
0.562 [6th highest ever]. The 2003 hot spell in Europe which was
perhaps wrongly blamed on CO2 global warming can now be explained
by one of the top dozen positive AMOs at 0.504. See this paper. Here is
what the authors of the paper concluded:
Overall, our results provide strong evidence that during the 20th
century the AMO had an important role in modulating boreal summer
climate on multidecadal time scales. We have focused here on time
mean anomalies, but some of the most important impacts are likely to
be associated with changes in the frequency of extreme events. There
is evidence that the frequency of U.S. droughts and the frequency of
European heat waves are both sensitive to Atlantic SSTs.
The so called unprecedented global warming from 1976 -2007 can be
explained by the extra warming resulting from the simultaneous
occurrence of positive PDO and positive AMO during the last 30 year
period especially 1995 -2007. A similar period occurred during about
1915-1945 and especially 1925 -1944 when almost an identical
warming took place. CO2 seems to have very little to do with these
naturally occurring climate cycles as they were happening well before
manmade CO2 began to rise.
Yet strangely PDO and AMO are not even covered in the IPCC climate
models. Now I wonder why? Could it explain why their predictions to
date are so far off and so soon after only 1-2 years after the release of
their last report? See Matt’s PDF here.
[link to icecap.us]