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Posted by Co2sceptic on May 14th 2012

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Figure 1: Reconstruction of precipitation amounts for the edge of the Tibet Plateau. The bars on the chart depict prominent weak phases of solar activity, which correspond to Om = Oort Minimum; Wm = Wolf Minimum; Sm = Spörer Minimum; Mm = Maunder Minimum; Dm = Dalton Minimum). Figure from: Sun & Liu (2012).

Yet another study has appeared in the Journal of Geophysical Research, this one looks at the precipitation history on the Tibet Plateau of the last 1000 years.

Geologist Dr. Sebastian Lüning and chemist Prof. Fritz Vahrenholt have written a summary of this paper, which I’ve translated in the English.
New Study of the Tibet Plateau: Whenever Solar Activity is Weak, the Rains Disappear

By Sebastian Lüning and Fritz Vahrenholt

The Tibet Plateau is at 3000 to 5000 meters elevation and is the highest and expansive high plateau on Earth. Therefore it reacts sensitively to climate changes. Junyan Sun and Yu Liu of the Chinese Academy of Sciences studied tree rings in the northwest plateau edge from two living 1000 year old trees. Tree growth in the area of study is particularly sensitive to the amount of precipitation.

Both scientists were able to reconstruct the distinct precipitation fluctuations occurring over the last 1000 years. The corresponding wet and dry periods each lasted some decades. A comparison to the other climate reconstructions coming from the same region shows great similarities in moisture development and that we are dealing with a representative regional climate signal. There were pronounced periods of droughts from 1092-1172, 1441-1517 and 1564–1730. Especially the Great Drought of 1441-1517 is mentioned in numerous historical documents and catastrophe reports. The Great Drought occurred during a weak period of solar activity, the so-called Spörer Minimum, which occurred from 1420 to 1570.

Interestingly, almost all other periods of drought occurred during times of solar minima, among them the Oort Minimum, Wolf Minimum, Maunder Minimum and Dalton Minimum (see Figure 1 above). Every time the sun goes into a slumber for a few decades, the rains on the Tibet Plateau stay away. A frequency analysis of precipitation curves also delivers evidence on solar cycles. Here the Gleissberg Cycle (60-120 year period) and the Suess/de Vries Cycle (180-220 years) are seen in the datasets.

The study once again documents the enormous importance of solar activity fluctuations on the development of climate. Why the IPCC degrades this important natural climate driver to a secondary small player in theoretical climate models (See our article: “What is the coming solar activity slumber bringing? The Hadley Centre Leaves Its Back Door Open“) simply boggles the mind.

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Indeed. With every passing study, it is becoming increasingly clear that the CO2 warmists are either in deep denial or complete intellectual oblivion.

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