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Contents
In enormous Chinese historical writings there are abundant climatic descriptions,
which are of great value for studying climatic fluctuations. Especially
since the 15th century the compilation of local annals has been expanded
in a greater scope, and one can find more systematical climatic materials
in thes annals.
We processed these materials from more than 2200 local annals and many
other historical writings, and abstracted from them more than two million
and two hundred thousand characters. The dryness/wetness of each year
in the recent 510-year period are classified into 5 grades: grade 1. very
wet; grade 2, wet, grade; grad 3. normal; grade 4. dry, and grade 5. very
dry. The territory of China is divided into 120 regions, ach of them has
an area corresponding approximately with one or two prefectures of th
epresent administration. The present yearly charts of dryness/wetness
have been constructed on the basis of these materials.
The charts consist of three parts: Part 1. 510 yearly charts of dryness/wetness
in the period of 1470-1979; Part 2. yarly charts of rainfall and its percentage
of dparture in the period 1951-1979; Part 3. The sequences of grades of
dryness/wetness in the 510-year period for the 120 regions in China. The
charts serve as a reference for various departments of scientific researches,
production, construction, and economical planning.
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