Scientific Reports magazine published the latest research results of guan xiaodan et al., a semi-arid climate change team from the school of atmospheric sciences, lanzhou university.The article titled "The role of dynamically induced variability in The recent warming trend slowdown over The Northern Hemisphere" (http://http://www.nature.com/articles/srep12669).This is the second time for the team to publish its research results on global climate change in Scientific Reports as the first author unit, and also a high-level research paper on the hot topic of "temperature stagnation".It is found that the stagnation of temperature increase in the northern hemisphere is the result of dynamic cooling counterbalancing radiation warming.

As a hot topic in the discussion of climate change in recent years, the stagnation of greenhouse gas warming has attracted the attention of different fields around the world and become the evidence of opponents of greenhouse gas warming theory, aiming to show that greenhouse gas has not fundamentally affected climate change.The research on the mechanism of stagnation of temperature increase has become the main topic of debate among different viewpoints.The continuous increase of greenhouse gas content and the occurrence of temperature stagnation make the view of "climate crisis" meet unprecedented challenges and become a social issue of great concern to the public.Therefore, the research on the causes of the stagnation of temperature increase and the reduction of the relationship between greenhouse gases and climate change lay a foundation for the in-depth understanding of the "climate crisis" caused by greenhouse gases.Research on stagnation of global warming shows that there is no obvious trend of global average temperature increase in the past 15 years, which seems to be contradictory to the background of global warming caused by greenhouse gas emissions.

Since temperature change is the result of the combined action of power and heat, the research on its climate effect should not only consider the close relationship between the decadal change of power factor and the global average temperature, but also quantify the effect of radiation temperature caused by human activities, so as to more reasonably estimate the long-term climate change trend.The research results of guan xiaodan et al divided the temperature change into dynamic and radiation temperature, and analyzed the characteristics of the temperature change caused by dynamic and radiation in the past 15 years.

Guan xiaodan et al. found that the dynamic temperature showed a significant cooling trend in the last 15 years, while the radiation temperature continued to rise, and the two offset each other, resulting in the "temperature stagnation" of global temperature in recent years, the control factor behind this phenomenon is the interdecadal natural variability of the climate system.Therefore, the current "temperature increase stagnation" is only temporary. The global average temperature will rise again with the phase transition of natural variability, and the cooling effect of dynamic temperature is the direct cause of the temperature increase stagnation.

By analyzing the difference between the original temperature, dynamic temperature and radiation temperature in the period of temperature increase stagnation and the period of significant temperature increase, this study found that the dynamic temperature in the middle and high latitudes of Eurasia and the Atlantic region of North America showed a significant cooling phenomenon in the period of temperature increase stagnation.The results of this study reveal the cooling effect of power and the warming effect of radiation in the process of temperature increase and stagnation.This proves that the "climate crisis" caused by greenhouse gases still exists. The continuous increase of greenhouse gases in the atmosphere will lead to the continuous rise of radiation temperature.

The research was jointly funded by the national natural science foundation of China and the ministry of science and technology.