Subjects: Other Disciplines >> Synthetic discipline submitted time 2023-03-28 Cooperative journals: 《中国科学院院刊》
Abstract: Air pollutants have strong homology with greenhouse gases and are closely related to fossil fuel combustion. The high-intensity energy use in the eastern region of China has turned this region into a hot area of carbon dioxide emission and heavy air pollution in the past. Since the implementation of the Action Plan for the Prevention and Control of Air Pollution, the adjustment of industrial structure and the improvement of terminal treatment technology have been driving the succession of key species of air pollution and the spatio-temporal distribution of greenhouse gases in China. This paper analyzes the trend in major air pollutants and greenhouse gas concentration in different regions of China from 2013 to 2020, and reveals the migration of air pollution and carbon emissions from the east to the northwest China. Based on statistical data, the causes of the changes in the spatio-temporal distribution of air pollutants and greenhouse gases in China are clarified, and corresponding solutions are proposed. The results can provide scientific and technological support for realizing the goal of pollution and carbon reduction synergy.
Subjects: Environmental Sciences, Resource Sciences >> Basic Disciplines of Environmental Science and Technology submitted time 2018-11-08 Cooperative journals: 《干旱区研究》
Abstract:农田铺设地膜是目前我国干旱半干旱地区采用较广泛的耕作方式。为了研究大面积地膜覆盖对东亚区域的气候效应,基于地膜试验观测与理论研究,建立了地膜覆盖的地-气-水热传输过程模型,并将地膜覆盖农田下垫面模块引入区域气候模式RegCM4和WRF模式中,对17 a夏季气候进行模拟试验。通过RegCM4模式输出的降水量、土壤温度、土壤湿度、感热通量和潜热通量等参量,与试验观测值、理论值进行对比,并通过WRF模式输出结果进行验证。结果表明:加入地膜覆盖农田下垫面模块的区域气候模式能够较为真实的描述其下垫面特征。进一步分析模拟结果发现,通过地膜覆盖影响近地面水热传输并作用于区域位势高度场、风场,进而影响大范围水汽输送,最终造成我国西北、华南地区降水减弱,西南地区和淮河流域降水增加。