Sunspot activity and precipitation in Hangzhou in recent 50 years

The precipitation in Hangzhou has to be checked by the landlord himself (go to the meteorological website), and Hebei is far from Hangzhou.

The following is the relationship between sunspot activity and precipitation for reference.

As early as the beginning of18th century, William Herschel, a British astronomer and discoverer of Uranus, noticed that when there were few sunspots, the rainfall on the earth was also decreasing.

At the end of 19, when studying the periodicity of drought, Professor Schweidov of Russia found from the tree rings on some old stumps that the distance between the tree rings was not equal, but sparse and dense, and the degree of density changed once every 1 1 year, which corresponds to the sunspot cycle. Tree rings represent new wood added by trees every year. If the weather is wet and warm in a certain year and the trees grow fast, a thicker layer of wood will grow; If the weather is cold in spring and summer, or dry in summer, the tree rings will narrow. Unfortunately, the life span of trees in Russia is very short, and the trees found by Schwedov are too young to explain more. Later, people collected a large number of tree ring data of hundreds or even thousands of years old, and made a systematic study. The statistical results show that the annual growth rate of trees is related to the relative number of sunspots in the same period, and trees grow faster in the peak year of solar activity.

Zhu Kezhen, a famous scientist in China, has also done a lot of research on the relationship between climate and solar activities. He found that the rainfall in the Yangtze River basin in China is directly proportional to the number of sunspots; On the other hand, the rainfall in the Yellow River basin is inversely proportional to the number of sunspots. According to the sunspot records in the history of China, he pointed out that the 4th, 6th, 9th, 12 and14th centuries with the most sunspots were also the centuries with many cold days in China. Many scientists in our country make full use of our phenology, local chronicles and various historical books to study the climate change in our country in the past 5000 years. The study of tree rings of ancient trees and the determination of radioactive carbon 14, as well as the study of oxygen 18, annual melting ice percentage and carbon dioxide content in Antarctic and Arctic deep ice cores in recent years, further show that solar activities not only have periodic changes of 1 1 year and 22 years, but also exist in 80-90 years, 200 years and 52 years. There is an obvious correlation between solar activity and long-term climate change.

On the other hand, some natural disasters are related to short-term changes in solar activities, such as flare explosions.

However, the relationship between solar activity and natural disasters is only a statistical correlation, not a causal relationship. This relationship is complicated, and the correlation is likely to be different due to different research fields and time periods.