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Complex pollution with high aerosol and ozone concentrations has recently been occurring in several densely populated cities in China, raising concerns about the influence of meteorological factors, including synoptic circulation and local conditions. In this study, comprehensive analyses on the associations between PM2.5, PM10, and O3 and meteorological conditions were conducted based on observations from radar wind profiler, microwave radiometer, automatic weather station, and air quality monitoring sites in Beijing during the spring of 2019. The results showed that the boundary layer height and temperature inversion were negatively (positively) correlated with PM (O3) concentrations, modulating the degree of air pollution. Five identified synoptic patterns were derived using geopotential height data of the ERA5 reanalysis, among which Type 1, characterised by south-westerly prevailing winds with high pressure to the south, was considered to be associated with severe PM and O3 contamination. This indicates that air pollutants originating from southern regions exert a major influence on Beijing through the transportation effect. In addition, high temperature, relative humidity, and low wind velocity exacerbate pollution. Overall, this study provides significant information for understanding the vital roles played by meteorological elements at both the regional and local scales in regulating air contamination during spring in Beijing.

The springtime dust events in Northeast Asia pose many economic, social, and health-related risks. Statistical models in the forecasting of seasonal dust events do not fully account for environmental variations in dust sources due to climate change. The Korea Meteorological Administration (KMA) recently developed the GloSea5-ADAM, a numerically based seasonal dust forecasting model, by incorporating the Asian Dust and Aerosol Model (ADAM)&rsquo, s emission algorithm into Global Seasonal Forecasting Model version 5 (GloSea5). The performance of GloSea5 and GloSea5-ADAM in forecasting seasonal Asian dust events in source (China) and leeward (South Korea) regions was compared. The GloSea5-ADAM solved the limitations of GloSea5, which were mainly attributable to GloSea5&prime, s low bare-soil fraction, and successfully simulated 2017 springtime dust emissions over Northeast Asia. The results show that GloSea5-ADAM&rsquo, s 2017 and 2018 forecasts were consistent with surface PM10 mass concentrations observed in China and South Korea, while there was a large gap in 2019. This study shows that the geographical distribution and physical properties of soil in dust source regions are important. The GloSea5-ADAM model is only a temporary solution and is limited in its applicability to Northeast Asia, therefore, a globally applicable dust emission algorithm that considers a wide variety of soil properties must be developed.

Following the settlement of the Tsarist and the Soviet power, the Evenks keep very few shamans and calendar collective rituals are not practiced anymore. With the fall of Communism and the birth of a new freedom, the Evenk intellectuals gave birth again to one of their rituals, that disappeared in the wings of oblivion during some fifty years. But is it really possible to make a forgotten collective ritual and this without a shaman' One after the other are presented the ancient ikènipkè as it was observed by G.M. Vasilevič during the 1920's, and the new ikènipkè as it is practiced by the Evenks of the towns and the villages, since the 1990's. The analysis shows what are the Evenk symbolisms resisted to the harassing history, and what are the contemporary ritual means of action., Suite à l'installation du pouvoir tsariste, puis soviétique, les Évenks n'ont presque plus de chamane et les rituels collectifs saisonniers ne sont plus pratiqués. Avec la chute du communisme et l'apparition d'une nouvelle liberté, les intellectuels évenks ont redonné vie à l'un de leurs rituels, disparu dans les coulisses de l'oubli pendant une cinquantaine d'années. Mais peut-on vraiment faire revivre un rituel collectif oublié et sans chamane ? Tour à tour sont présentés l'ancien ikènipkè tel qu'il fut observé par G.M. Vasilevič dans les années 1920, et le nouvel ikènipkè tel qu'il est pratiqué par les Évenks des villes et des villages, depuis les années 1990. Les analyses montrent quelles symboliques évenkes ont résisté à l'histoire tourmentée et quels sont les moyens d'action rituelle contemporains.

This early spring issue begins with articles on spring activities such as maple syrup production (sugaring off), brooding baby chicks, and spring care for orchards. Published in this issue is Dr. Creelman's travel diary of his journey through Australasia and the Orient. Other articles pertain to the College's short course in agriculture, a history of the Vineland Experimental Farm, and agricultural education in public schools. Campus articles encourage students to patronize the Co-operative Supply Store and a report on the annual meeting of the Ontario Agricultural and Experimental Union. Campus news reports of the athletic activities, the O. A. C. ex-students banquet, and the carnival. The Alumni column lists the O. A. C. and Macdonald Institute graduates of 1914 and their current residence, as well as, students who have enlisted in the military and other alumni activities. The Macdonald Institute column reports on the activities of the Y. W. C. A., fundraisers for the war effort, women's athletics, and the winter promenade. While the Locals column provides campus humour. A pioneer industry Gleanings from a trip to Australasia and the Orient Why spring care of the orchard? Baby chicks Agricultural short course The Vineland Experimental Farm Co-operation in advertising The Experimental Union Agriculture in public schools in 1914 Editorial Athletics College life Alumni Macdonald Locals advertising

This issue contains the winning valedictory essay on the English writers Addison, Macaulay, and Carlyle. Agricultural articles pertain to parasites in Ontario and protecting peach trees from "winter-kill". An alumnus writes of his experience of traveling across Canada. Campus news reports on the end of final examinations, the final athletic competitions, the sophomore's dinner party, and the At Home promenade for the Dairy Short course. The Personals column contains alumni news. While the Locals column provides campus humour. Ontario's parasites The sum of some trifles Winter protection for fruit trees Addison, Macaulay, and Carlyle as writers of English prose Editorial Athletics Locals College reporter The sophomore's dinner party Personals advertising