Analysis on Interdecadal Correlation between Solar Activity and Snow Depth over the Qinghai-Xizang Plateau and East Asian Atmospheric Circulation in Winter
The sun is the main energy source of the earth's climate system. Recognizing the influence of the solar activity on the earth's climate system will improve the climate prediction accuracy. On the basis of knowing the solar activity rules on short term and long term time scales,more further studies about the response of components of the climate system to the solar activity is necessary. These studies proved that the solar activity is an important factor to change the climate system. Because previous studies show that the present global warming belongs to reasonable extent of climate systems fluctuations,it is necessary to explore the natural factor's role further. There still has larger space for investigating the influence of solar activity on climate system,also,some unknown fields have not been involved. Snow depth over the Qinghai-Xizang Plateau is one of the key physical factors affecting climate system,however,relationship between snow and the solar activity is still not accessed. Solar radio flux(SRF),solar sunspot number(SSN)and total solar irradiance(TSI)are commonly used parameters of solar activity,which have different physical meanings. For the first time,this paper reveals the interdecadal correlation between solar activity and winter snow depth over the Qinghai-Xizang Plateau and the typical circulation pattern over the East Asia,that is the Arctic Oscillation and the East Asian winter monsoon. In the future, in-depth study on the influence of solar activity on the climate system will be done,and the physical process and physical mechanism will be further revealed in the later work. Arctic Oscillation and East Asian winter monsoon have obvious relation to the snow depth over the Qinghai-Xizang Plateau and solar activity,and the interdecadal correlations between them are discussed in this paper. Some researches about the solar activity and the East Asian winter monsoon on interdecadal time scales(longer than 11 years cycle period)is very rare. This paper studies the interdecadal correlation between the solar activity and the East Asian winter monsoon and discusses the interdecadal correlation between the winter snow depth over the Qinghai-Xizang Plateau and Arctic Oscillation and East Asian winter monsoon. The results show that on interdecadal time scale,over 11 years solar cycle, the sun modulated the change of winter snow depth over the Qinghai-Xizang Plateau and East Asian atmospheric circulation ahead. At the fourth 11-years lag year,through Monte-Carlo test method,the correlation coefficient between snow depth and SRF is 0.8013,which passes 0.05 significant level. Our study also exposes that winter snow depth over the Qinghai-Xiang Plateau has significant contemporary and lag correlation with Arctic Oscillation and the East Asian winter monsoon on long time scale.