Long-range transport of acidifying substances in East Asia—Part II: Source–receptor relationships

Region-to-grid source–receptor (S/R) relationships are established for sulfur and reactive nitrogen deposition in East Asia, using the Eulerian-type Community Multiscale Air Quality (CMAQ) model with emission and meteorology data for 2001. We proposed a source region attribution methodology by analyzing the non-linear responses of the CMAQ model to emission changes. Sensitivity simulations were conducted where emissions of SO₂, NO_x, and primary particles from a source region were reduced by 25%. The difference between the base and sensitivity simulations was multiplied by a factor of four, and then defined as the contribution from that source region. The transboundary influence exhibits strong seasonal variation and generally peaks during the dry seasons. Long-range transport from eastern China contributes a significant percentage (>20%) of anthropogenic reactive nitrogen as well as sulfur deposition in East Asia. At the same time, northwestern China receives approximately 35% of its sulfur load and 45% of its nitrogen load from foreign emissions. Sulfur emissions from Miyakejima and other volcanoes contribute approximately 50% of the sulfur load in Japan in 2001. Sulfur inflows from regions outside the study domain, which is attributed by using boundary conditions derived from the MOZART global atmospheric chemistry model, are pronounced (10–40%) over most parts of Asia. Compared with previous studies using simple Lagrangian models, our results indicate higher influence from long-range transport. The estimated S/R relationships are believed to be more realistic since they include global influence as well as internal interactions among different parts of China.     

论佛教折射的环保理念与环保实践

综观人类历史,宗教与现实生活联系紧密,在各类社会问题的解释与解决中一直发挥着不可小觑的作用。随着全球环境问题的日益突出,佛教中所体现的环保理念日益引起人们的重视。本文试从佛教环保理念的思想渊源入手,围绕自然观、生命观和理想观等内容来探讨佛教与其环保实践问题。     

接种稀释水的空白对BOD5测定的影响

从接种液种类、空白ＢＯＤ５大小、接种液最佳添加范围等方面对ＢＯＤ５测定进行探讨，提出以接纳工业废水的河水作为最佳接种液，雨季时以土壤浸取液更适合。探讨了接种液空白值对ＢＯＤ５标液和工业废水的影响，结果表明，河水空白应控制在０．１－０．８ｍｇ／Ｌ土壤浸取液空白控制在０．０１－０．１０ｍｇ／Ｌ为宜。     

接种稀释水的空白对BOD_5测定的影响

从接种液种类、空白 BOD5大小、接种液最佳添加范围等方面对 BOD5测定进行探讨 ,提出以接纳工业废水的河水作为最佳接种液 ,雨季时以土壤浸取液更适合。探讨了接种液空白值对 BOD5标液和工业废水的影响。结果表明 ,河水空白应控制在 0 .1～0 .8mg/ L,土壤浸取液空白控制在 0 .0 1～ 0 .1 0 mg/ L为宜。     

乙烯排海废水深度处理及回用研究

茂名石化乙烯公司排海废水水质较好，远低于国家排放标准。经过深度处理后，水质可达到回用水要求。再进一步通过挂片腐蚀试验、杀菌试验和动态模拟试验，证明了乙烯排海废水能回用做循环水补充水。     

粤北土地资源人口承载能力及其现实意义

本文从粮食生产潜力的角度,提出了广东省粤北(韶关市和清远市)的土地资源人口承载能力,并以我国2000年人口平均粮食需要量和第四次全国人口普查结果,预测了韶关市和清远市人口承载能力临界值出现的时间。这对宏观指导农业生产和控制人口增长,有重要的现实意义。     

Knowledge graph analysis and visualization of AI technology applied in COVID-19

Environmental Science and Pollution Research - With the global outbreak of coronavirus disease (COVID-19) all over the world, artificial intelligence (AI) technology is widely used in COVID-19 and...