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Exhibit 7 -
Japan
With the Medieval Warm Period
and Little Ice Age clearly evident in Taiwan and China, the appearance of
the same events in Japan would provide useful validation. Ironically, most
of the proxy and historical evidence comes from none other than Kyoto
itself, the ancient capital of Japan. According to a study by Tagami
[26]
"On the
Medieval Warm Period.
It is not doughty [doubted? - J.D.]
that there was a warm climate age in historical times of Japan. Many former
studies, e.g. the study on the changes of cherry-blossom-viewing date in
Kyoto, show the warm climate around the early this millennium. But they are
not clear when the warm climate began and when it ended. And also they are
not clear how it relate to the climate situation in other areas. In this
study, climate in the Medieval Warm Period of Japan is reconstructed and
also its condition is compared to that of other areas.
Processing
databases and the analysis
Mainly the
historical documents are used in this study. The data which are chosen from
them are classified into two types. One is a seasonal climate type from the
7th century and the other is a daily weather type from the 10th century. The
former type data are climatic hazards, unusual weathers,
cherry-blossom-viewing dates, lake freezing dates and so on. The climatic
hazards were drought, long rain, heavy snow, mild winter and so on. The
latter type data are described in private diaries of nobles who lived in
Kyoto. The databases have been prepared for the both type of them. And using
the databases, climate around the Medieval Warm Period is reconstructed. It
is as following way: first, seasonal climate charts are drawn, then climate
condition of each season is examined. …
Some remarks on
the climate of the Medieval Warm Period
As the results,
some characteristics of climate are recognized around the Medieval Warm
Period. However it is relatively hot conditions continued until the 8th
century, cool condition appeared for short period in the late 9th century.
Then warm conditions continued from the 10th century to the former half of
the 15th century. After the latter half of 15th century, cool conditions
appeared and then considerable cold conditions started from the 17th
century. So, between the former and the latter cold ages, the warm condition
is clear from the 10th century to the 14th century."
The conclusions from this
study underline the importance of not allowing a Euro-centric view of
science to blind scientists to valuable work being done in non-western
countries. In spite of the halting English used
(thus the need to quote at length from it),
the conclusion from Japan is clear and unambiguous - there was a Medieval
Warm Period and a Little Ice Age, and they occurred at exactly the same
times as found elsewhere in the world.
A paper by J. Magnuson et al
on freeze/melt dates for lakes and rivers around the world
[15] gives further
evidence of the Little Ice Age in Japan with data for freeze dates on Lake
Suwa, in which earlier freeze dates indicate a cold climate, later freeze
dates a warmer climate. Lake Suwa has the longest record of freeze dates in
the study, with data going back to 1443 AD, almost three times longer than
for any other water mass in the study.
It too shows the
impact of the Little Ice Age, as according to Magnuson et al.
"Lake Suwa was ice covered
for 240 out of 243 winters
(99%) from 1443 to 1700, but only for 261 out
of 291 winters (90%)
from 1700 to 1985".
The earlier
`99%' period was right within the Little Ice Age.
Exhibit 8 -
Tasmania, Australia
Tasmania is an
island state of Australia, about the size of Maine, deep in southern
latitudes. In this exhibit, we not only find confirmation of the Medieval
Warm Period, but also obtain some insight into the origins - and the flaws -
inherent in the `Hockey Stick' itself.
Ed Cook, a prominent tree
ring researcher, has been a frequent visitor to Tasmania over the past 10
years, taking tree ring samples from a unique species of long-lived softwood
known as `Huon Pine' (Lagarostrobos
Franklinii), some of the living trees
being over 1,000 years old. Due to Tasmania's remoteness south of the
Australian mainland, Cook's papers did not receive the critical examination
they warranted, as there were flaws in both his handling of local data and
in his conclusions.
To calibrate the
tree rings against temperature, Cook and his team used urban surface
temperature records from the dry eastern half of the island to compare with
tree rings taken from the wet western half, even though there were rural
surface records in the west from which a more valid comparison could have
been made. In his earlier studies, no allowance was given to the Fertilizer
Effect of CO2, making his conclusions about recent decades invalid.
Back in 1992, seven years
before Mann's paper appeared, Ed Cook was the co-author of a paper in
`Holocene' [3]
in which a time series of Huon Pine tree rings going back to 900 AD was
presented. Here is a scan of a graph he presented
(colour added for emphasis and clarity).

Fig.10 -
Huon Pine tree ring widths from Lake Johnston in western Tasmania
From the above
Huon Pine record, it is clear that there were strong growth surges from 940
- 1000 AD and from 1100-1200 AD, during the Medieval Warm Period. Cook
acknowledges this fact in his paper.
The Little Ice
Age appears weak in this proxy record, attributed by Cook to the moderating
influences of the Southern Ocean on such a small island.
The growth spurt of the Huon
Pines in the late 20th century (coloured
yellow with an identification label added)
cannot be attributed to climate alone, but must inevitably result from the
CO2 Fertiliser Effect, a phenomenon not allowed for by Cook, but which has
since found to be accelerating plant growth all over the world, exactly as
predicted by plant biologists. When the late 20th century growth is
discounted because of this factor, it is clear that climate was warmer
during medieval times in Tasmania than is the case today.
Cook's drawing of a heavy
curved line to act as his `zero' line which he believes to be largely
non-climatic in origin clearly imposes his own subjective view of what the
data means. If on the other hand the `general shape of the growth trend'
(as he puts it)
is climatic in origin, the whole record would
then indicate an even stronger imprint of the Medieval Warm Period.
In the same
paper, Cook used that subjective zero line as a basis to reconstruct growing
season temperatures in Tasmania, producing a 25-year `low-pass filter'
smoothed graph bearing a striking similarity to the later `Hockey Stick'
produced by Mann. The result of this statistical processing is shown in
Fig.11

Fig.11 - Temperature
reconstruction from tree rings acc. to Cook [xx]
According to Cook's
explanation as to how he converted the tree ring widths graph of Fig.9 into
the temperature reconstruction of Fig.10
(making the Medieval Warm Period all but disappear in
the process), he calibrated the growth rings
against surface temperatures recorded at three weather stations in Tasmania.
He used Hobart (the island's capital city, pop.
130,000), Launceston
(pop. 70,000),
and Low Head Lighthouse on the north coast. Hobart has a documented heat
island [21],
Launceston is similarly affected, while Low Head has a proven local daytime
anomaly [4]
causing its daytime temperature to rise in recent decades due to vegetation
growth close to the instrument creating a mini sun-trap. Upon these faulty
records, he developed his whole reconstruction.
A further flaw in his study
was the geography of the island itself. Tasmania has two distinct climate
regimes - a cool wet climate in the western half of the island, and a dry
warmer climate in the eastern half. The sharp contrast between the two is
very obvious even to visitors driving across the island
(Fig.12).

Fig.12 -
Tasmanian climatic zones and locations
The Huon Pines
were in the west, close to Mt. Read, in a very high rainfall region, but
Cook's three calibrating temperature records came from the warmer, drier
east. While his statistical treatments were elegant and esoteric, the faulty
surface records he used invalidate the whole reconstruction exercise.
Clearly, this must also be a
fundamental flaw in the `Hockey Stick' itself, since it too is predominantly
based on tree rings, particularly for the first half of the millennium, the
rings being calibrated against the northern hemisphere surface record of
temperature, a record which is itself severely contaminated by heat islands
and other local error effects [4].
A further flaw in such calibration attempts will occur due to the Fertiliser
Effect of CO2 enhancing tree
ring growth, thus inserting an increasing and structural error into the
calibration.
Exhibit 9 -
South Africa
In a recent paper in the
South African Journal of Science, Tyson et al [27]
developed a climate history from
oxygen 18 isotopes (a
temperature proxy), carbon 14 isotopes
(a proxy for solar activity),
and colour density data obtained from a well-dated stalagmite in a cave in
the Makapansgat Valley. According to the authors -
"The climate
of the interior of South Africa was around 1°C cooler in the Little Ice
Age and may have been over 3°C higher than at present during the extremes
of the Medieval Warm Period. It was variable throughout the millennium,
but considerably more so during the warming of the eleventh to thirteenth
centuries. Extreme events in the record show distinct teleconnections with
similar events in other parts of the world, in both the northern and
southern hemispheres."
They dated the
Medieval Warm Period at pre-1000 to 1300 AD, with mean temperatures 6 to 7°F
warmer than today, and dated the Little Ice Age from 1300 to 1800 with mean
temperatures up to 2°F cooler than today.
The authors then
proceeded to attribute a cause to these two events.
"The lowest
temperature events recorded during the Little Ice Age in South Africa are
shown to be coeval with the Maunder and Sporer Minima in solar irradiance.
The medieval warming is shown to have been coincided with the cosmogenic
10Be and 14C isotopic maxima recorded in tree rings elsewhere in the world
during the Medieval Maximum in solar radiation."
The variability
of the sun causing impacts on earth's climate, was reaffirmed by this South
African study. All the climate changes they noted correlated with known
changes on the sun.
The Hockey Stick A New Low in Climate Science
- 2 -
3
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4
First published at
http://www.john-daly.com/hockey/hockey.htm
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© 2007, Allen Aslan Heart / White Eagle Soaring of the Little Shell Pembina Band, a
Treaty
Tribe of the Ojibwe Nation
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