On September 16th, at the invitation of the College of Atmospheric Sciences, Prof. Mu Mu of Fudan University who is the academician of the Chinese Academy of Sciences, Prof. Wang Huijun of Nanjing University of Information Science and Technology who is the academician of the Chinese Academy of Sciences, made a guest lecture at the Guanyun Building in the West District of Chengguan Campus on the 110th anniversary of Lanzhou University. The report was entitled 'Some Thoughts on the Predictability of Arctic Sea-Ice-Air Systems Affecting Extreme Weather Events in Eurasia' and 'The Causes of China's Monsoon Climate Pattern and the Evolution of Tropical Cyclone Patterns Over 65 Million Years'. Vice President Pan Baotian attended the report and delivered a speech. Some teachers, students and alumni of the College of Atmospheric Sciences, School of Earth Sciences, and the College of Earth and Environmental Sciences attended the report. The report was hosted by Prof. Tian wenshou of the College of Atmospheric Sciences.

       Pan Baotian welcomed and thanked the two academicians as a guest lecturer on earth science and participated in the commemorative activities on the occasion of the 110th anniversary of Lanzhou University. He hoped that the two academicians will continue support the construction and development of the relevant disciplines of earth science at Lanzhou University.

       Academician Mumu said that the disturbance of the Arctic sea ice system (such as sea ice, sea temperature, temperature) can cause obvious response to mid-latitude atmospheric circulation (such as the Ural Mountains and North Atlantic Oscillation) after about 2 weeks.  Further research is needed on the possible mechanisms by which the Arctic system affects extreme weather events in Europe and Asia, and the synergistic effects of the Arctic sea ice system on mid-latitude weather events.

       Academician Wang Huijun believes that the climate pattern of south wet and north dry as well as east wet and west dry are not “existed since ancient times”. The pattern has been formed since the Miocene (about 20 million years ago) because of the tectonic movement of the earth's crust. In the early Eocene (50 million years ago), the South Indian Ocean was the world's largest generating center for tropical cyclones. The closure of the Panamanian sea lane and the contraction of the Indonesian sea lane were crucial to the formation of the spatial distribution pattern of modern tropical cyclones.

       After the report, the two academicians interacted and answered the questions raised by everyone.