[P-EM14] Study of coupling processes in solar-terrestrial system

[PEM14-16] Solar cycle inside the near-surface climate of the Tibetan Plateau

*Changgui Lin¹ (1.National Space Science Center, Chinese Academy of Sciences)

Keywords:Solar cycle, Climate on Earth, Tibetan Plateau

The tiny temperature changes (perhaps with an amplitude of about 0.01°C) due to the variation in the total solar irradiance (with an amplitude of nearly 0.1 percent over an 11-year cycle in step with the cycle of sunspots) are detected. Nevertheless, It is proposed that solar output may affect climate on Earth via ozone within the stratosphere or by changing the cloud forming processes. There is not convincing evidence supporting the hypotheses yet, at least at the global scale. But when it comes to the case for the Tibetan Plateau (TP), the largest and highest land on Earth where the atmosphere is relatively thin, are there significant influence of solar activities on the climate? By looking at several climate variables, our prelimilary results reveal more apparent “solar cycle” inside the TP's climate compared to other regions within the same latitudinal range. The “solar” cycle makes approximately 4% variability contribution to most of the near-surface variables for the TP's climate. Although a clear causal link cannot be inferred yet, our results may provide a clue: it is likely that the solar activities influence the climate of Tibetan Plateau indirectly (throught interactions with global circulations) and the moisture plays an important role in shaping the TP's climate.