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Preliminary results of the study on wind erosion in the Qinghai-Tibetan Plateau using 13.Cs technique

Chinese Science Bulletin 2000年第11期45卷 1019-1025页

作者： yan ping, dong guangrong, zhang xinbao & zhang yiyun1. key laboratory of environmental change and natural disaster,{3., Beijing normal university, Beijing 100875, china 2. Institute of Desert Research, Chinese Academy of Sciences, Lanzhou 73.000, china 3. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, china 4. Department of Physics, Sichuan Union university, Chengdu 610041, china key laboratory of environmental {3. and natural disaster the Ministry of Education of China Beijing Normal University Beijing China Institute of Desert Research Chinese Academy of Sciences Lanzhou China Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu China Department of Physics Sichuan Union University Chengdu China

The worldwide fallout of caesium-13. (13.Cs) associated with the nuclear weapon tests during the 1950s and 1960s has provided a valuable man-made tracer for studies of soil erosion and sediment delivery. But relatively few researchers have used it to estimate wind erosion. In this note, the 13.Cs technique is introduced into the studies of wind erosion and its modern processes inthe Qinghai-Tibetan Plateau. Two 13.Cs reference inventories of 982.11 and 2 3.6.04 Bq · m-2 wereestablished preminarily, distributed in the south and middle-north parts of the studied arearespectively. By analyzing the patterns of 13.Cs depth profiles from sampling sites, the aeolianprocesses of erosion and deposition in nearly 40 years have been revealed, i.e. the shrub coppicedunes (S1) and semi-fixed dunefields (S3. experienced the alternation of erosion and deposition,while the grasslands (S4, S6 and S7) and dry farmlands (S5) suffered erosion only. By using 13.Csmodel, the average wind erosion rates for shrub coppice

关键词： 13.Cs technique Qinghai-Tibetan Plateau wind erosion.

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Pathways of china's PM2.5 air quality 2015–2060 in the context of carbon neutrality

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National Science Review 2021年第12期8卷 63-73页

作者： Jing Cheng Dan Tong Qiang zhang yang Liu Yu Lei Gang yan Liu yan Sha Yu Ryna yiyun Cui Leon Clarke Guannan Geng Bo Zheng Xiaoye zhang Steven J.Davis Kebin He ministry of education key {3. for Earth System Modelling Department of Earth System ScienceTsinghua University Department of Earth System Science University of California Chinese Academy of environmental Planning Joint Global change Research Institute Pacific Northwest National LaboratoryUniversity Research Court Center for Global Sustainability School of Public PolicyUniversity of Maryland State key Joint laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua University Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua University State key laboratory of Severe Weather&key laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological Sciences

Clean air policies in china have substantially reduced particulate matter(PM2.5) air pollution in recent years,primarily by curbing end-of-pipe ***,reaching the level of the World Health Organization(WHO) guidelines may instead depend upon the air quality co-benefits of ambitious climate ***,we assess pathways of Chinese PM2.5air quality from 2015 to 2060 under a combination of scenarios that link global and Chinese climate mitigation pathways(*** 2℃-and 1.5℃-pathways,National Determined Contributions(NDC) pledges and carbon neutrality goals) to local clean air *** find that china can achieve both its near-term climate goals(peak emissions) and PM2.5air quality annual standard(3. μg/m~3. by 203. by fulfilling its NDC pledges and continuing air pollution control ***,the benefits of end-of-pipe control reductions are mostly exhausted by 203.,and reducing PM2.5exposure of the majority of the Chinese population to below 10 μg/m~3.by 2060 will likely require more ambitious climate mitigation efforts such as china’ s carbon neutrality goals and global1.5℃-*** results thus highlight that china’s carbon neutrality goals will play a critical role in reducing air pollution exposure to the level of the WHO guidelines and protecting public health.

关键词： clean air policy carbon neutrality synergy pathway air quality standards WHO guidelines

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