EMSC PhD candidate Xinxin Li report in European Geosciences Union General Assembly 2016
Forecast of spring precipitation has always been a difficult task in climatic prediction. However, a recent study by professor Zhiwei Wu from Earth System Modeling Center, Nanjing University of Information Science & Technology (NUIST) and his PhD candidate Xinxin Li reveals that the ASI (Arctic Sea Ice) variability in the Norwegian Sea and the Barents Sea in the preceding winter is intimately connected with interannual variations of the East Asian spring precipitation (EAP), thus providing a new potential predictability source.
The EGU 2016 General Assembly:
Xinxin Li reported this discovery in the European Geosciences Union General Assembly 2016, which was held during 17-22 April in Vienna. It is the first time that a NUIST student participated in this meeting and presented an oral report.
Xinxin Li is among the 3 Chinese speakers that reported in the session "The global monsoon system: variability, dynamics and prediction". The other two are academician Fahu Chen from Lanzhou Unierisity and professor Song Yang from Sun Yat-Sen University.
In the report, Xinxin Li revealed that the prior winter ASI has a significant inverse relationship with the spring precipitation over East Asia, particularly southern China. The marked ASI anomaly can persist from winter through the ensuing spring. The anomalous ASI can excite a distinct Rossby wave train over the Eurasian continent propagating from the Norwegian Sea toward East Asia and affecting the variability of the downstream atmospheric circulation. For a reduced ASI, such a wave train pattern is usually associated with an anomalous low pressure center over the Mongolian plateau, which accelerates the East Asian subtropical westerly jet. The intensified subtropical westerly jet, concurrent with lower-level convergence and upper-level divergence, enhances the local convection and consequently favors rich spring precipitation over East Asia. For an excessive ASI, the situation tends to be opposite. Through such a process, the winter ASI may exert a profound influence on the East Asian rainfall in the ensuring spring. She suggested that the winter ASI may provide another predictability source for the East Asian spring climate in the context of the spring predictability barrier associated with ENSO encountered by most dynamical models.
The research result has been applied to promotion and application of seasonal prediction in the the Beijing-based National Climate Center. In April this year, the related paper was published on Journal of Climate. (http://esmc.deelol.com/index.php?m=content&c=index&a=show&catid=14&id=99)
The European Geosciences Union (EGU) is Europe’s premier geosciences union, dedicated to the pursuit of excellence in the Earth, planetary and space sciences for the benefit of humanity, worldwide. The EGU 2016 General Assembly, the largest geosciences meeting in Europe, brings together thousands of geoscientists from all over the world into one meeting covering all disciplines of the Earth, planetary and space sciences. It provides an opportunity for journalists and science writers to learn about new developments in a variety of topics, including climate change, recent space and planetary science missions, natural disasters, raw materials, ice loss and sea-level rise, and to talk to researchers. This year, the EGU hosted over 13,000 geoscientists from 109 countries at its annual conference.
About the researchers:
Prof. Zhiwei Wu, who received his PhD degree in University of Hawaii at Manoa (USA) and Institute of Atmospheric Physics, Chinese Academy of Sciences, is the professor of Meteorology and Associate Director of Earth System Modeling Center (ESMC), Nanjing University of Information Science & Technology. His current research focuses on dynamic atmospheric processes with a time scale longer than a week that influence medium- and extended-range, and seasonal predictions. Research approaches involve observational analyses, numerical modeling, and theoretical analysis. Research efforts focus on understanding of the fundamental physics governing variations of weather and climate.
Xinxin Li, a PhD candidate in Meteorology of Nanjing University of Information Science & Technology, focuses on the mechanism of East Asian spring precipitation and predictability. She once won the NUIST third-prize scholarship. Her paper Potential Influence of Arctic Sea Ice to the Interannual Variations of East Asian Spring Precipitation
was accepted by Journal of Climate
, and published on AMS in April, 2016.
Xinxin Li in EGU 2016
Xinxin Li in EGU 2016
Translated from: http://news.nuist.edu.cn/Show.aspx?AI=15078