Biography: Prof. Dr. Yan Liu holds a Ph.D. in Tectonics from the Institute of Geology, Chinese Academy of Sciences. He is a Professor at the Institute of Geology, Chinese Academy of Geological Sciences. He has engaged in comprehensive surveys on the Tibetan plateau and adjacent regions for a long time, focusing on mass exchange between Earth’s exterior and interior and implications to global climate changes, and thus acquired several German DAAD Awards and China Tibetan Plateau Research Society Award.

Topic: Towards Global Carbon Neutrality: Inspiration from Comprehensive Surveys on Tibetan Plateau and Adjacent Regions

Abstract: In-depth understanding mechanism of global climate change is critical to achieving global carbon neutrality in the near future. The continuous convergence between Indian and Asian continents has created a growing Tibetan plateau. Rough 7 trillion tones atmospheric CO₂ were transformed as organic carbon, carbonates and carbonic magmas/fluids trapped in the Tibetan thickened crust and adjacent foreland basins, leading to glacial-interglacial climate. During the interglacial periods, the Tibetan plateau is a huge heat source, together with higher sea surface temperature, resulting in much freshwater being removed to low latitudes including the Tibet plateau. Tibet plateau thus becomes a greenly giant water tower and sequesters huge amounts of CO₂ through tectonics and plants to decline global atmospheric CO₂ concentrations greatly. During the glacial times, the Tibetan plateau is a hugely cold source that much freshwater is sent to high latitudes, e.g., transformed as ice sheets in Greenland island. The low latitudes thus become deserts. The deserted plateau releases, rather than absorb, large amounts of CO₂, resulting in global atmospheric CO₂ concentrations never below 180 ppmv and rising subsequently. Tibetan plateau has thus remained a quasi-dynamic balance of globally atmospheric CO₂ concentrations since the Miocene times. Today much freshwater is returning to inland deserted regions, especially the deserted Tibetan plateau, due to global warming triggered off by anthropic emissions. Large amounts of atmospheric CO₂ and much water are sent to Tibetan deeply broken silicates by the tectonics and plant roots, enhancing subsurface silicate chemical weathering continuously. Pedogenic carbonates and organic carbon are also continuously formed in the wetlands. These processes are always carbon unsaturation so that at least 10 billion tons/year atmospheric CO₂ are passively sequestered by the Tibetan plateau and adjacent regions in the near future based on our conservative estimates. Therefore, man-made planting wetland within Tibetan and adjacent regions is a better approach to achieve global carbon neutrality in the near future.

Biography: Dr. Qin Wenting holds a Ph.D. in Petroleum Engineering from Louisiana State University, USA. She is an associate professor in the Petroleum Department at China University of Petroleum (Beijing). Her research interests include water control in oil production, wastewater management in oil-producing wells, and clean production methods for oil recovery. As first author, she has published a book and many technical journal and conference papers, including articles in Top International Journal of Environmental Science and Petroleum Engineering: Journal of Environmental Management, SPE Journal, and in the proceedings of the Top Petroleum Engineering Conference SPE ATCE. She has served as a session chair for the 35th and 36th ASME International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016 and OMAE 2017). She has been the principal researcher of several research projects funded by National Natural Science Foundation of China and Xinjiang Natural Science Foundation.

Topic: Water Leak Control for the Oil-producing Wells Using Downhole Water Sink Technology

Abstract: Casing or tubing leaks cause unwanted water production from oil-producing wells. Many chemical and mechanic water control technologies can be used to solve this problem, including squeezing chemical shutoff fluids into the targeted zone or using plugs, cement, packers, patches to block the leakage. Although those methods are field-proven to be effective, the mechanical solutions may require well logs to detect the water entry point in the well. Chemical methods may present environment risks. In this study, an alternative method, Downhole Water Sink, is proposed to solve the problem of unwanted water production from a casing or tubing leak. The effectiveness of this method to control water production in a well with casing or tubing leaks is tested using the Hele-Shaw experimental model. The results show that this method can control unwanted water production via dynamic control of the pressure drawdown in the reservoir. From a technical standpoint, the advantage of this technology is that it eliminates the need to run logs to locate the water entry point and does not require chemical injection into the formation. From an environmental standpoint, this technology has the circular economy elements. Because the produced water in this technology contains little or no oil, it can be reused for reinjection into the reservoir for water flooding or pressure maintenance purposes. Therefore, a production-reinjection process to recycle the produced water is established to reduce the pollution caused by discharging the wastewater into the environment.

Biography: Dr. Gao Nannan has completed her PhD from the Chinese academy of Sciences and postdoctoral studies from Peking University. She is senior technical manager (Postdoctoral Researcher) of Research Institute of Urban Green Development, Shenzhen Institute of Building Research Co., Ltd. She has published more than 20 papers in reputed journals. She has extensive experience studying on smart city policy research, city planning on low-carbon ecological cities, urban livability, urban biodiversity and city ecological restoration of national land space. She was a core researcher of “The Key Technology And Demonstration Of Comprehensive Study Of Urban Energy Systems And Carbon Emissions” as one National Key R&D Program of Intergovernmental International Cooperation in Science & Technology Innovation and “Research on the Synergy Mechanism of Urban Energy Structure-Carbon Emissions-Air Pollution” as one Key Special Projects for the 2020 International Cooperation Projects of Shenzhen Science and Technology Innovation Committee, China.

Topic: Spatial Quantitative Analysis of Urban Energy Consumption Based on Night-Time Remote Sensing Data and POI

Abstract: Climate change has become a major global environmental issue that is widely concerned by countries around the world. It has been a very clear scientific consensus that the global carbon emission has to be cut urgently under the context of the global warming and extreme climate. Currently, few studies on the urban energy consumption have been performed, especially the quantitative research on the scale of urban blocks, which is actually required by cities in order to adopt precise control, optimize energy structure, and reduce carbon emissions. This paper took Jingmen, a resource-based city, as a case city, and applied night-time remote sensing data, POI, and other big data. Quantitative analysis of the spatial data on key factors affecting carbon emissions in transportation, industry, and construction sectors, respectively, was applied to realize block- scale spatial visualization of urban energy consumption, and furthermore, to discuss the impact of urbanization and industrialization on urban energy consumption. It is found that the continuous growth of energy consumption in the industrial sector was the main driving factor of the city's total energy consumption growth. Among the 72 towns (blocks), 10 towns (blocks) were dominated by industrial energy consumption which accounted for up to 68% the energy consumption of Jingmen. From 2005 to 2015, the total energy consumption of Jingmen City increased by 828,200 tons of standard coal equivalent(tce), while the number of towns (blocks) with more than 10,000 tons of standard coal equivalent(tce) decreased by 4. Therefore, the energy consumption of Jingmen City showed a trend of increase and concentration. The conclusions of this study can fill up the problems that cannot be found in the energy consumption statistics of cities, and propose a more accurate way to reduce energy consumption in Jingmen City, which provide a reference for the green transformation of similar small and medium-sized resource-based cities.

Biography: Professor Zhang Qingwen has completed her PhD from the Chinese academy of Sciences and postdoctoral studies from Chinese Academy of Agricultural Sciences. She is the Director of the Department of Agro-Ecosystem Health and a research leader of the Innovative Research Team of the agricultural clean watershed Construction, Institute of Environment and Sustainable Development in Agriculture, CAAS. She has published more than 70 papers in reputed journals and 5 books. She has extensive experience studying on agricultural nonpoint sources pollution analysis using the REEs, and stable nitrogen tracing method and treatment for pollution control. Nine patents were authorized.

Topic: Nitrogen Management by Livestock Manure Application in the Integrated Crop-livestock System(ICLS)

Abstract: Nitrogen(N) and phosphorus(P) pollution is common problem worldwide. Global N and P cycle is reshaped by human activities, especially through agricultural production. The first pollution survey in China estimated that 57% of nitrogen (N) and 67% of phosphate (P) in water bodies were from agricultural production losses. The UN Food and Agriculture Organization has listed intensive livestock and poultry farming as one of the three major sources of environmental pollution in the world. It was estimated that 551 million tons of manure (dry weight base) were generated in 2014, which contained 25.3 million tons of N, 5.2 million tons of P, and 19.4 million tons of potassium, respectively. And trend will increase even further with the expansion of the livestock and poultry breeding industry. In this speech, Professor Zhang Qingwen will introduce some researches of her team considering identification of key points in N flows in China's agricultural system using NUFER model, and the potential of crop-livestock system coupling based on land bearing capacity of cropland. Besides, the results of field experiment on gaseous nitrogen loss control and optimized nitrogen management under ICLS showed that combined application of biogas slurry and synthetic fertilizer could potentially reduce N₂O emission and increased crop yield. N management by livestock manure application in the integrated crop-livestock system(ICLS) can provide a scientific reference for achieving green and high-quality development of agriculture.

Biography: Professor Yuanhe Tang is working at the Applied Physics Department of Xi’an University of Technology to now after she got bachelor and master degrees in physics from Shaanxi Normal University of China at 1988 and 1991. During this time she got a Ph.D. degree from Xi’an Jiaotong University in 2006. From March to May 2011, she visited York University in Canada. From April 2014 to March 2015, she visited the University of Wollongong in Australia. Her research fields are focusing on 4 parts: Specialized in the upper atmospheric wind field measurement by imaging interference technology; the strong light partial gating imaging; the low-level light enhancement imaging; the sunlight’s direct lighting etc. About 60 papers have been published in the journals, 22 patents have been authorized, 2 monographs had been published, and 17 projects have been chaired by her. 6 prototypes have been made by her group; Two academic awards are obtained by her group. She teaches the course Quantum Mechanics to undergraduate students and the course of Advanced Optics to postgraduate students. She has contributed 12 orals to the international congresses and served as chapter president many times. She is the reviewers of Applied Optics, Optics Communication, Chinese Optics Letter, Acta Physica Sinica, etc.

Topic: Research on the Upper Atmospheric Gravity Wave Parameters at the Altitude of 90-100 km Detected by GBAII

Abstract: In the upper atmospheric radioactive transfer, the AGWs (atmospheric gravity waves) come from the Earth’s surface physical phenomenon upward propagating. AGWs are reflected by the variation of the upper atmospheric concentration and wind velocity. AGWs play an important role in the dynamics of the upper and middle atmosphere. In this topic, the three number densities of O₂ nightglow species at the peak altitude of 94 km at Xi'an had obtained through the self-made GBAII (Ground-based airglow imaging interferometer) prototype which could obtain the O₂ (0-1) nightglow’s imaging interference fringes at the three local times in June.13 2012, Oct.18, 2018, and April.7 2019. And three corresponding AGWs parameters of the periods, 2 dimension wavelengths, energy flux, and momentum flux were obtained by GBAII, respectively: AGWs’ period ranges from 0.32 h to 7.05h; the meridional wavelengths range from 30.53 km to 494.90km and the zonal one ranges from 28.22 km to 610.89km; the energy flux of AGWs ranges from 0.0605m³s^-3 to 60.6554m³s^-3 and the momentum flux ranges from 0.0017m²s^-2 to 1.5788m²s^-2. The research results can provide some scarce data for O₂ concentration in the upper atmosphere and related wave parameters of AGWs.