2017年10月 – 2018年10月：波士顿大学（美国），地球与环境学院，访问学者

2014年9月– 2019年6月：南京大学，地理与海洋科学学院，理学博士 （导师：陈镜明院士、张秀英教授）
	
2010年9月 – 2014年6月：河南城建学院，测绘与城市空间信息学院，理学学士

主要从事氮循环方向的学科交叉研究（地理学、大气科学、生态学、农业科学等）

氮循环；
碳氮循环；
环境遥感 ；
氮沉降与排放；

欢迎报考我的研究生，只需具备任意一项研究背景：
（1）遥感科学（不限于大气遥感）；
（2）大气科学（熟悉一种主流大气模式，如GEOS-Chem、wrf/cmaq）；
（3）生命科学，熟悉地球生物化学模型（碳循环或氮循环均可）；
（4）数学或计算机科学，具备扎实的统计理论知识（掌握任意一门R、python、matlab分析软件）

2019年7月-至今：兰州大学，资源环境学院，研究员

《大气环境遥感》
《科研论文写作》
《地理学前沿进展》

担任Frontiers in Environmental Science副主编
中国遥感应用协会定量遥感专业委员会委员

期刊审稿人：Nature, PNAS, Nature Communication, Nature Food, Geophysical Research Letter, Environmental Science & Technology, Remote Sensing of Environment, Atmospheric Chemistry and Physics, Environmental Pollution, Science of the Total Environment, Scientific Reports等

1. 大气氮沉降遥感估算理论

开展了基于遥感监测数据估算无机氮沉降的研究，深入探索了利用OMI传感器观测的NO2柱浓度和IASI传感器观测的NH3柱浓度估算全球陆地大气无机氮干、湿沉降的方法，构建了基于遥感资料估算无机氮干、湿沉降模型。
具体地，研究的贡献主要包含四个方面：
（1）构建了全球陆地NO2和NH3浓度垂直方向上分布模型（多项高斯函数）。卫星监测的NO2和NH3数据为柱浓度数据，缺乏垂直方向上的浓度分布廓线信息，基于GEOS-Chem模型输出的三维NO2和NH3浓度数据建立了NO2和NH3廓线模型。
（2）发展了基于卫星观测数据估算无机氮干沉降的方法，详细地验证了卫星估算近地表无机氮浓度的精度，进而结合模拟的干沉降速率估算得到了全球陆地无机氮干沉降。基于遥感估算的方法弥补了模式基于排放清单模拟结果的空间上的不确定性，提升了估算的空间分辨率。
（3）提出了一种基于遥感数据估算无机氮湿沉降模型（混合效应模型），利用遥感监测的混合层NO2和NH3柱浓度和降水量数据，估算了全球陆地生态系统的无机氮湿沉降。
（4）系统地评估了全球陆地生态系统在热点区域的硝氨组分构成和无机氮沉降的时间变化趋势。研究结果为定量评估氮沉降对生态系统的影响提供了定量依据，也为相关部门制定生态环境保护政策提供了科学依据。

2. 农业氮循环与氮排放估算理论

研究团队基于多源地理空间数据（包括农田施肥、畜牧业养殖、遥感活性氮浓度等）和区域统计数据，建立了自下而上的农业氨排放计算方法，开发了全球近四十年（1980-2018年）的长记录农业氨排放数据集。研究发现从1980年到2018年，全球农业系统（包括农田和畜牧业）氨排放量增加了78%，其中农田氨排放量增加了128%，畜牧业氨排放量增加了45%。全球三种主要作物（小麦、玉米和水稻）和四种主要动物（牛、鸡、羊和猪）占氨排放总量的70%以上。该研究首次在全球尺度量化了主要作物和动物类型对农业氨排放的贡献，回答了目前农业系统氨的主要排放源，对准确认识全球农业氨污染提供了重要数据支撑。

兰州大学氮循环团队与中国农业大学、斯坦福大学、北京大学、南京大学、中国科学院华南植物园、中山大学、中国海洋大学和南京农业大学的学者合作，在国际著名综合学术期刊Proceedings of The National Academy of Sciences of the United States of America（PNAS）发表了题为“Exploring global changes in agricultural ammonia emissions and their contribution to nitrogen deposition since 1980”的研究成果。兰州大学资源环境学院刘磊研究员为论文第一作者，刘磊研究员与中国农业大学刘学军教授为共同通讯作者。该论文是研究团队近五年关于农业氨排放与大气氮沉降研究的集成性成果。

2020 	Excellent doctoral thesis of Jiangsu Province, China
2020	Excellent doctoral thesis of Nanjing University
2019	Li Xiaowen Satellite Youth Award
2018	National Doctoral Scholarship (rank the first)
2018	First Level School Scholarship
2017	Haihang Scholarship
2017	First Prize School Scholarship
2016	National Doctoral Scholarship (rank the first)
2015	Excellent Graduate Students 
2015	Excellent Communist Youth League Members
2015	First Level GuangHua Scholarship
2015	First Prize in Doctoral Forum on Remote Sensing 
2015	First Prize of Graduate Forum, Annual Meeting of Jiangsu Geographic Society
2014	First Prize in School Scholarship and Merit Student Award

国家自然科学基金项目，2021，主持
国家自然科学基金项目，2023，主持

在Nature、PNAS等发表60余篇

2023 (2)
1)	Lei Liu. 2023 Urbanization is reshaping food production in China. Nature, 621, 42 doi: https://doi.org/10.1038/d41586-023-02753-9 (Nature正刊，影响因子65)
2)	Lei Liu*, Wen Xu, Zhang Wen, Pu Liu, Hang Xu, Sheng Liu, Xiankai Lu, Buqing Zhong, Yixin Guo, Xiao Lu, Yuanhong Zhao, Xiuying Zhang, Songhan Wang, Peter M. Vitousek, Xuejun Liu*, 2023. Modeling global oceanic nitrogen deposition from food systems and its mitigation potential by reducing overuse of fertilizers, Proceedings of the National Academy of Sciences (PNAS) , 120, e2221459120 


2022 (7)
1) Lei Liu*, Wen Xu, Xiankai Lu, Buqing Zhong, Yixin Guo, Xiao Lu, Yuanhong Zhao, Wei He, Songhan Wang, Xiuying Zhang, Xuejun Liu*, Peter Vitousek, 2022. Exploring global changes in agricultural ammonia emissions and their contribution to nitrogen deposition since 1980, Proceedings of the National Academy of Sciences (PNAS), 119, e2121998119 (ESI 前1%高被引；Altmetric影响力位列所有2243万篇论文前5%；被人民日报等媒体转载报道)
2) Pu Liu, Jia Ding, Lei Liu*, Wen Xu, and Xuejun Liu, 2022, Estimation of surface ammonia concentrations and emissions in China from the polar-orbiting Infrared Atmospheric Sounding Interferometer and the FY-4A Geostationary Interferometric Infrared Sounder, Atmospheric Chemistry and Physics, 22, 9099-9110. 
3)	Jing Wei*, Zhanqing, Lin Sun, Wenhao Xue, Zongwei Ma, Lei Liu, Tianyi Tian, Maureen Cribb, 2022, Extending the EOS long-term PM2.5 data records since 2013 in China: application to the VIIRS Deep Blue aerosol products. IEEE Transactions on Geoscience and Remote Sensing, 60, 1-12, 4100412. 
4) Pu Liu, Jia Ding, Yufeng Ji, Hang Xu, Sheng Liu, Bin Xiao, Haodong Jin, Xiaojun Zhong, Zecheng Guo, Houcheng Wang*, Lei Liu*, 2022. Satellite Support to Estimate Livestock Ammonia Emissions: A Case Study in Hebei, China. Atmosphere, 13, 1552. 
5) SonghanWang*, Yongguang Zhang*, Weimin Ju, Mousong Wu, Lei Liu, Wei He, Josep Peñuelas, 2022. Temporally corrected long-term satellite solar-induced fluorescence leads to improved estimation of global trends in vegetation photosynthesis during 1995–2018. ISPRS Journal of Photogrammetry and Remote Sensing, 194, 222-234. 
6) Yuyu Yang, Lei Liu*, Pu Liu, Jia Ding, Xu Hang, Sheng Liu, 2022. Improved global agricultural crop- and animal-specific ammonia emissions during 1961–2018, Agriculture Ecosystems & Environment 344, 108289.
7) Wen Xu#, Yuanhong Zhao#, Zhang Wen#, Yunhua Chang, Yuepeng Pan, Yele Sun, Xin Ma, Zhipeng Sha, Ziyue Li, Jiahui Kang, Lei Liu, Aohan Tang, Kai Wang, Ying Zhang, Yixin Guo, Lin Zhang*, Lifang Sheng, Xiuming Zhang, Baojing Gu, Yu Song, Martin Van Damme, Lieven Clarisse, Pierre-François Coheur, Jeffrey L. Collett Jr, Keith Goulding, Fusuo Zhang, Kebin He*, Xuejun Liu*, 2022, Increasing importance of ammonia emission abatement in PM2.5 pollution control. Science Bulletin, 67, 1745-1749


2021 (8)
1)	Yuyu Yang, Lei Liu*, Feng Zhang, Xiuying Zhang, Wen Xu, Xuejun Liu, Zhen Wang, Yaowen Xie*, 2021, Soil nitrous oxide emissions by atmospheric nitrogen deposition over global agricultural systems, Environmental Science & Technology, 55, 4420-4429.
2)	Yuyu Yang, Lei Liu*, Zhaohai Bai, Wen Xu, Feng Zhang, Xiuying Zhang, Xuejun Liu, Yaowen Xie*, 2021, Comprehensive quantification of global cropland ammonia emissions and potential abatement, Science of The Total Environment, 151450.
3)	Lei Liu *, Yuyu Yang, Ruipeng Xi, Xiuying Zhang, Wen Xu, Xuejun Liu, Pu Liu, Zhen Wang, 2021, Global wet reduced nitrogen deposition derived from satellite measurements combining chemistry transport models, Journal of Geophysical Research-Atmosphere, 126, e2020JD033977p
4)	Yuyu Yang, Lei Liu*, Feng Zhang, Xiuying Zhang, Wen Xu, Xuejun Liu, Yi Li, Zhen Wang, Yaowen Xie*, 2020, Enhanced Nitrous Oxide Emissions Caused by Atmospheric Nitrogen Deposition over China, Environmental Science and Pollution Research, 28, 15350-15360
5)	Ruipeng Xi, Lei Liu, Jizong Jiao, Yaowen Xie, Yuyu Yang, Pu Liu, 2021, Analysis of temporal and spatial characteristics of surface ammonia concentrations in different land cover types in the five provinces of Northwest China, Journal of Lanzhou University, 57, 736-742
6)	Zhen Wang, Xiuying Zhang*, Lei Liu, Shanqian Wang, Limin Zhao, Xiaodi Wu, Wuting Zhang, Xianjin Huang*, 2021, Estimates of methane emissions from Chinese rice fields using the DNDC model, Agricultural and Forest Meteorology, 303, 108368 Qi Zhang, Yanan Li, Mengru Wang, Kai Wang, Fanlei Meng, Lei Liu, Yuanhong Zhao, Lin Ma, Qichao Zhu, Wen Xu*, Fusuo Zhang, Atmospheric nitrogen deposition: A review of quantification methods and its spatial pattern derived from the global monitoring networks, Ecotoxicology and Environmental Safety, 216, 112180
7)	Xiuying Zhang*, Zhen Wang, Lei Liu, Nan Zhan, Jiayao Qin, Xinqing Lu, Miaomiao Cheng, 2021, Assessment of the risks from dietary lead exposure in China, Journal of Hazardous Materials, 418, 126134
8)	Lijie He, Lunche Wang*, Zhengqiang Li, Daoyang Jiang, Lin Sun, Dong Liu, Lei Liu, Rui Yao, Zhigao Zhou, Jing Wei*, 2021, VIIRS Environmental Data Record and Deep Blue aerosol products: validation, comparison, and spatiotemporal variations from 2013 to 2018 in China, Atmospheric Environment, 250, 118265
9)	Jing Wei*, Zhanqing Li*, Wenhao Xue, Lin Sun, Tianyi Fan, Lei Liu, Tianning Su, Maureen Cribb, 2021, The ChinaHighPM10 dataset: generation, validation, and spatiotemporal variations from 2015 to 2019 across China, Environment International, 146, 106290 (ESI Highly Cited Paper)

2020 (9)
1)	Lei Liu*, Xiuying Zhang*, Wen Xu, Xuejun Liu, Yan Zhang, Yi Li, Jing Wei, Xuehe Lu, Shanqian Wang, Wuting Zhang, Limin Zhao, Zhen Wang, Xiaodi Wu, 2020. Fall of oxidized while rise of reduced reactive nitrogen deposition in China, Journal of Cleaner Production, 272, 122875. 
2)	Lei Liu*, Xiuying Zhang, Wen Xu, Xuejun Liu, Yi Li, Jing Wei, Zhen Wang, Xuehe Lu, 2020. Ammonia volatilization as the major nitrogen loss pathway in dryland agroecosystems, Environmental Pollution, 265, 114862.
3)	Lei Liu*, Xiuying Zhang*, Wen Xu, Xuejun Liu, Jing Wei, Zhen Wang, Yuyu Yang, 2020. Global estimates of dry ammonia deposition inferred from space-measurements, Science of the Total Environment, 730, 139189. 
4)	Lei Liu*, Xiuying Zhang, Wen Xu, Xuejun Liu, Xuehe Lu, Jing Wei, Yi Li, Yuyu Yang, Zhen Wang, Anthony Y. H. Wong, 2020, Reviewing global estimates of surface reactive nitrogen concentration and deposition using satellite observation, Atmospheric Chemistry and Physics, 20, 8641-8658
5)	Lei Liu*, Xiuying Zhang*, Wen Xu, Xuejun Liu, Yi Li, Jing Wei, Meng Gao, Jian Bi, Xuehe Lu, Zhen Wang, Xiaodi Wu, 2020. Challenges for global sustainable nitrogen management in agricultural systems, Journal of Agricultural and Food Chemistry, 68, 3354-3361.
6)	Jing Wei, Wei Huang, Zhanqing Li*, Lin Sun, Xiaolin Zhu, Qiangqiang Yuan, Lei Liu, Maureen Cribb, 2020, Cloud detection for Landsat imagery by combining the random forest and superpixels extracted via energy-driven sampling segmentation approaches, Remote Sensing of Environment, 248, 1-14.
7)	Jing Wei, Zhanqing Li*, Maureen Cribb, Wei Huang, Wenhao Xue, Lin Sun, Jianping Guo, Yiran Peng, Jing Li, Alexei Lyapustin, Lei Liu, Hao Wu, Yimeng Song, 2020. Improved 1 km resolution PM2.5 estimates across China using enhanced space-time extremely randomized trees, Atmospheric Chemistry and Physics, 20, 3273-3289. (ESI Highly Cited Paper)
8)	Zhen Wang, Xiuying Zhang*, Lei Liu, Shanqian Wang, Limin Zhao, Xiaodi Wu, Wuting Zhang, Xianjin Huang*, Inhibition of methane emissions from Chinese rice fields by nitrogen deposition based on the DNDC model, Agricultural Systems, 184, 102919.
9)	Jing Wei*, Zhanqing Li, Lin Sun, Yiran Peng, Lei Liu, Lijie He, Wenmin Qin, and Maureen Cribb, 2020, MODIS Collection 6.1 3 km resolution aerosol optical depth product: global evaluation and uncertainty analysis, Atmospheric Environment, 240, 117768. 
10)	Zhen Wang, Xiuying Zhang*, Lei Liu, Miaomiao Cheng, Junfeng Xu, 2020, Spatial and seasonal patterns of atmospheric nitrogen deposition in North China, Atmospheric and Oceanic Science Letters, 13, 188-194

2019 (3)
1)	Lei Liu*, Xiuying Zhang*, Anthony Y.H. Wong, Wen Xu, Xuejun Liu, Yi Li, Huan Mi, Xuehe Lu, Limin Zhao, Zhen Wang, Xiaodi Wu, Jing Wei, 2019. Estimating global surface ammonia concentrations inferred from satellite retrievals, Atmospheric Chemistry and Physics. 19, 12051-12066.
2)	Zhen Wang, Xiuying Zhang*, Lei Liu, Shanqian Wang, Xiaodi Wu, Wuting Zhang, Limin Zhao, Xuehe Lu, Xiaofeng Zhao, 2019. Evaluating the effects of nitrogen deposition on rice ecosystems across China. Agriculture, Ecosystems and Environment, 285, 106617. 
3)	Wen Xu, Xuejun Liu*, Lei Liu, Anthony J. Dore, Aohan Tang, Li Lu, Qinghua Wu, Yangyang Zhang, Tianxiang Hao, Yuepeng Pan, Jianmin Chen, Fusuo Zhang, 2019. Impact of emission controls on air quality in Beijing during APEC 2014: Implications from water-soluble ions and carbonaceous aerosol in PM2.5 and their precursors, Atmospheric Environment, 210, 241-252.

2018 (6)
1)	Xiuying Zhang*, Xiaowei Chuai*, Lei Liu, Wuting Zhang, Xuehe Lu, Limin Zhao, Dongmei Chen, 2018. Decadal trends in wet sulfur deposition in China estimated from OMI SO2 columns. Journal of Geophysical Research: Atmospheres, 123, 10796-10811. 
2)	Wen Xu, Lei Liu, Miaomiao Cheng, Yuanhong Zhao, Lin Zhang, Yuepeng Pan, Xiuming Zhang, Baojing Gu, Yi Li, Xiuying Zhang, Jianlin Shen, Li Lu, Xiaosheng Luo, Yu Zhao, Zhaozhong Feng, Jeffrey L. Collett Jr., Fusuo Zhang, Xuejun Liu*, 2018. Spatial-temporal patterns of inorganic nitrogen air concentrations and deposition in eastern China. Atmospheric Chemistry and Physics, 18, 10931-10954.
3)	Xiuying Zhang*, Wuting Zhang, Xuehe Lu, Xuejun Liu, Dongmei Chen, Lei Liu, Xianjin Huang*, 2018. Long-term trends in NO2 columns related to economic developments and air quality policies from 1997 to 2016 in China. Science of the Total Environment, 639, 146-155.
4)	Wuting Zhang, Xiuying Zhang, Lei Liu, Limin Zhao, Xuehe Lu, 2018. Temporal and spatial variations of atmospheric NO2 concentration in North China Plain with multi-source Satellite Remote Sensing. Journal of Remote Sensing, 22, 335-346.
5)	Wen Xu, Yuanhong Zhao, Xuejun Liu*, Anthony J. Dore, Lin Zhang, Lei Liu, Miaomiao Cheng, 2018. Atmospheric nitrogen deposition in the Yangtze River basin: Spatial pattern and source attribution. Environmental Pollution, 232, 546-555.
6)	Shanqian Wang, Xiuying Zhang*, Yuandan Ma, Xinhui Li, Min Cheng, Xiaomin Zhang, Lei Liu, 2018. Detecting Sulfuric and Nitric Acid Rain Stresses on Quercus glauca through Hyperspectral Responses. Sensors, 18, 830.

2017 (7)
1)	Lei Liu, Xiuying Zhang*, Yan Zhang, Wen Xu, Xuejun Liu, Xiaomin Zhang, Junlan Feng, Xinrui Chen, Yuehan Zhang, Xuehe Lu, Shanqian Wang, Wuting Zhang, Limin Zhao, 2017. Dry Particulate Nitrate Deposition in China. Environmental Science & Technology, 51, 5572-5581.
2)	Lei Liu, Xiuying Zhang*, Wen Xu, Xuejun Liu, Yi Li, Xuehe Lu, Yuehan Zhang, Wuting Zhang, 2017. Temporal characteristics of atmospheric ammonia and nitrogen dioxide over China based on emission data, satellite observations and atmospheric transport modeling since 1980, Atmospheric Chemistry and Physics, 17, 9365-9378.
3)	Lei Liu, Xiuying Zhang*, Wen Xu, Xuejun Liu, Xuehe Lu, Dongmei Chen, Shanqian Wang, Wuting Zhang, 2017. Estimation of monthly bulk nitrate deposition in China based on satellite NO2 measurement by the Ozone Monitoring Instrument. Remote Sensing of Environment, 199, 93-106.
4)	Lei Liu, Xiuying Zhang*, Wen Xu, Xuejun Liu, Xuehe Lu, Shanqian Wang, Wuting Zhang, Limin Zhao, 2017. Ground ammonia concentrations over China derived from satellite and atmospheric transport modeling, Remote Sensing, 9, 1-19.
5)	Lei Liu, Xiuying Zhang*, Taiyang Zhong, Shanqian Wang, Wuting Zhang, Limin Zhao, 2017. Spatial Distribution and Risk Assessment of Copper in Agricultural Soils, China, Human and Ecological Risk Assessment, 23, 1404-1416. 
6)	Xiuying Zhang, Xuehe Lu*, Lei Liu, Dongmei Chen, Xiaomin Zhang, Xuejun Liu, Yan Zhang, 2017. Dry deposition of NO2 over China inferred from OMI columnar NO2 and atmospheric chemistry transport model. Atmospheric Environment, 169, 238-249.
7)	Wen Xu, Yuanhong Zhao, Xuejun Liu*, Anthony J. Dore, Lin Zhang, Lei Liu, Miaomiao Cheng, 2017, Atmospheric nitrogen deposition in the Yangtze River basin: Spatial pattern and source attribution, Environmental Pollution, 232, 546-555

2016 (6)
1)	Lei Liu, Xiuying Zhang*, Shanqian Wang, Wuting Zhang, Xuehe Lu, 2016. Bulk sulfur deposition in China. Atmospheric Environment, 135, 41-49. 
2)	Lei Liu, Xiuying Zhang*, Shanqian Wang, Xuehe Lu, Xiaoying Ouyang, 2016. A Review of Spatial Variation of Inorganic Nitrogen Wet Deposition in China. PloS one, 11, e0146051. 
3)	Lei Liu, Xiuying Zhang*, Xuehe Lu, 2016. The composition, seasonal variation, and potential sources of the atmospheric wet sulfur and nitrogen deposition in the southwest of China. Environmental Science and Pollution Research, 23, 6363-6375. 
4)	Lei Liu, Xiuying Zhang*, Taiyang Zhong, 2016. Pollution and health risk assessment of heavy metals in urban soil in China. Human and Ecological Risk Assessment, 22, 424-434.
5)	Xiuying Zhang, Taiyang Zhong, Lei Liu, Xiaomin Zhang, Min Cheng, Xinhui Li, 2016. Chromium occurrences in arable soil and its influence on food security in China. Environmental Earth Science, 75, 257. 
6)	Xiuying Zhang, Taiyang Zhong, Dongmei Chen, Min Cheng, Lei Liu, Xiaomin Zhang, Xinhui Li, 2016. Assessment of arsenic occurrence in arable soil and its related health risk in China. Environmental Geochemistry and Health, 38, 691-702.

2015 (1)
1)	Xiuying Zhang, Taiyang Zhong, Lei Liu, Xiaoying Ouyang, 2015. Impact of soil heavy metal pollution on food safety in China. PLOS one, 10, e0135182.

Xuejun Liu, Wen Xu, Lei Liu, Enzai Du, Jianlin Shen, Xiaosheng Luo, Xiuying Zhang, Keith Goulding, 2020. Monitoring Atmospheric Nitrogen Deposition in China. In Xuejun Liu, & Enzai Du (Eds.), Atmospheric Reactive Nitrogen in China: Emission, Deposition and Environmental Impacts. Singapore: Springer Singapore, pp. 41-65 
刘学军,许 稳,杜恩在,张 颖,沈健林,骆晓声,王 伟,潘月鹏,刘 磊. 第8章 大气氮沉降测定方法. 见《土壤氮循环实验研究方法》，颜晓元等编. 北京：科学出版社，2020.