Article
Environmental Sciences
Konstantina Nakoudi, Christoph Ritter, Iwona S. Stachlewska
Summary: This study explores the long-term properties of cirrus clouds for the first time over an Arctic site, finding that cirrus clouds are generally associated with colder and calmer wind conditions, but their properties do not strongly depend on temperature and wind speed, with wintertime cirrus appearing thicker and with more spherical ice particles. The majority of cirrus at the Arctic site are associated with westerly flow and tend to be optically thicker and consist of more spherical ice particles compared to lower latitudes.
Article
Environmental Sciences
Yuxin Zhao, Jiming Li, Lijie Zhang, Cong Deng, Yarong Li, Bida Jian, Jianping Huang
Summary: This study investigates the diurnal variations in cloud cover and cloud vertical distribution over the Tibetan Plateau. The results show that total cloud cover peaks in the morning and varies spatially and temporally. The study also reveals the dominant presence of opaque cirrus clouds over the plateau, which exhibit significant diurnal variations.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Zhen Yang, Dan Li, Jiali Luo, Wenshou Tian, Zhixuan Bai, Qian Li, Jinqiang Zhang, Haoyue Wang, Xiangdong Zheng, Holger Vomel, Frank G. Wienhold, Thomas Peter, Dale Hurst, Jianchun Bian
Summary: Balloon sounding combined with COBALD and FPs was used to investigate the vertical distribution characteristics of cirrus clouds. Eight summer balloon measurements in Kunming and Lhasa were analyzed to show the distribution of cirrus clouds. Criteria such as BSR, CI, and RHice were used to compare the differences in cirrus occurrence. The results indicated that BSR455 > 1.2 was the optimal criterion and the median CI (RHice) within cirrus clouds was primarily in the 18-20 (90%-110%) range.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Environmental Sciences
Qingqing Dong, Zhongwei Huang, Wuren Li, Ze Li, Xiaodong Song, Wentao Liu, Tianhe Wang, Jianrong Bi, Jinsen Shi
Summary: This study, using ground-based lidar observation, demonstrates that high-concentration non-spherical Taklimakan desert dust can be transported to the Tibetan Plateau, highlighting its potential impacts on regional climate and ecosystem.
Article
Geochemistry & Geophysics
Yuxuan Bian, Liping Liu, Jiafeng Zheng, Songhua Wu, Guangyao Dai
Summary: The distributions of cloud phases have a significant impact on the weather and climate system, especially clouds above the Tibetan Plateau that influence regional and global atmospheric circulation. A retrieval algorithm combining polarization lidar and millimeter cloud radar measurements was developed and applied to data from a field campaign in the central Tibetan Plateau. The algorithm successfully retrieved the structure and phase of different types of clouds, validating its reliability.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2023)
Article
Chemistry, Multidisciplinary
Nkanyiso Mbatha, Lerato Shikwambana
Summary: This study presents the characterization of cirrus clouds observed on April 10 and 11, 2019 using the ground-based University of Zululand (UZ) lidar, and compares the results with other radar observations.
APPLIED SCIENCES-BASEL
(2022)
Article
Environmental Sciences
Minglu Li, Jingying Mao, Shuqing Chen, Jianchun Bian, Zhixuan Bai, Xuemei Wang, Weihua Chen, Pengfei Yu
Summary: Lightning-generated nitrogen oxides (NOx) significantly contribute to the surface ozone (O3) concentration on the Tibetan Plateau (TP) in summer, affecting the atmospheric chemical processes involving O3.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Yuexuanzi Wang, Yingying Yan, Kunyu Duan, Shaofei Kong, Jintai Lin, Huang Zheng, Aili Song, Zexuan Zhang
Summary: The study found that on an interdecadal timescale, summer ozone concentrations in Central China are significantly correlated with spring thermal forcing over the Tibetan Plateau. High thermal forcing leads to lower ozone concentrations due to enhanced monsoon and vertical ascent, while low thermal forcing results in increased ozone concentrations. The study also noted that while total atmospheric energy has been increasing, summertime ozone concentrations have shown an increasing trend over the past two decades, partially offsetting the ozone reduction attributed to climate factors.
ATMOSPHERIC RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Wenfeng Chen, Tandong Yao, Guoqing Zhang, R. Iestyn Woolway, Wei Yang, Fenglin Xu, Tao Zhou
Summary: During the extreme warming period, surface temperatures in glacial regions of the Tibetan Plateau have increased faster than non-glacial areas, and the duration and intensity of glacier surface heatwaves have significantly increased. These changes may pose potential threats to the sustainability of glacier water resources and increase the risk of glacier related hazards.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Optics
Liang Peng, Fan Yi, Fuchao Liu, Zhenping Yin, Yun He
Summary: The conventional lidar methods suffer from the challenge of determining backscatter and extinction coefficients from a single equation, requiring additional assumptions. In contrast, the single-line-extracted PRR lidar method allows for the accurate retrieval of optical properties without additional assumptions. Observations from this method in Wuhan from 2016 to 2017 provided detailed characterization of aerosols and cloud particles, serving as observational standards for optical properties at 532 nm wavelength.
Article
Meteorology & Atmospheric Sciences
Zhiqiang Lin, Xiuping Yao, Weidong Guo, Jun Du, Zhenbo Zhou
Summary: This study investigates the impact of Tibetan Plateau vortex (TPV) on extreme precipitation events (EPEs) using TPV and precipitation datasets. The results show that TPV has a significant positive contribution to EPEs. EPEs tend to occur near the center and the southeastern quadrant of TPV. The structure and circulation of TPVs associated with EPEs are significantly different from those without EPEs.
ATMOSPHERIC RESEARCH
(2022)
Article
Meteorology & Atmospheric Sciences
Renran Zhou, Gaili Wang, Suolang Zhaxi
Summary: Cloud cover is frequent in Motuo, with an annual occurrence frequency of 65.3%. The distribution of cloud base height shows two peaks at 0-1 km and 2-3 km, corresponding to precipitation and nonprecipitation clouds. The peak in cloud top height at 6-7 km might be related to precipitation clouds.
ATMOSPHERIC RESEARCH
(2021)
Article
Environmental Sciences
Dongliang Han, Jianping Huang, Lei Ding, Guolong Zhang, Xiaoyue Liu, Changyu Li, Fan Yang
Summary: Ecosystem imbalance is linked with feedback mechanisms, and global warming exacerbates its effects, posing a threat to sustainable development. Research on the Tibetan Plateau indicates that ecosystem imbalance will worsen with increased terrestrial oxygen production.
Article
Geosciences, Multidisciplinary
Masato Ito, Hirohiko Masunaga
Summary: In this study, A-Train observations and reanalysis data are analyzed to assess the physical processes responsible for the iris effect. The major findings suggest that upper-tropospheric stability plays a role in the changes of anvil cloud fraction, while precipitation efficiency has less control on it. The day and nighttime cloud radiative effects are expected to cancel out over a diurnal cycle, indicating a neutral cloud feedback.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Review
Environmental Sciences
Ruiyang Sun, Guangyi Sun, Sae Yun Kwon, Xinbin Feng, Shichang Kang, Qianggong Zhang, Jie Huang, Runsheng Yin
Summary: The biogeochemical cycling of mercury on the Tibetan Plateau is influenced by various factors such as human activities, climate change, and glacier melting. Significant bioaccumulation of mercury in Tibetan aquatic food chains highlights the need for international collaboration to reduce mercury migration.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Environmental Sciences
Xianjun Xu, Zhongjing Jiang, Jing Li, Yiqi Chu, Wangshu Tan, Chengcai Li
ATMOSPHERIC ENVIRONMENT
(2020)
Article
Environmental Sciences
Changqing Lin, Alexis K. H. Lau, Xiang Qian Lao, Jimmy C. H. Fung, Xingcheng Lu, Zhiyuan Li, Jun Ma, Chengcai Li, Andromeda H. S. Wong
ENVIRONMENTAL RESEARCH
(2020)
Article
Engineering, Environmental
Wangshu Tan, Yingli Yu, Chengcai Li, Jing Li, Ling Kang, Huabin Dong, Limin Zeng, Tong Zhu
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Engineering, Environmental
Wangshu Tan, Chengcai Li, Yuechen Liu, Xiangxinyue Meng, Zhijun Wu, Ling Kang, Tong Zhu
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2020)
Article
Meteorology & Atmospheric Sciences
Ling Gao, Lin Chen, Chengcai Li, Jun Li, Huizheng Che, Yeping Zhang
Summary: The study found that the JAXA AHI aerosol optical depth (AOD) product has similar spatial distribution and correlation with the MODIS product, but underestimates in the morning and overestimates in the afternoon. Ground-based observations validation showed good correlation when sparsely vegetated surfaces were excluded. The performance of the AHI AOD product depends on observation times and surface types.
ATMOSPHERIC RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Ling Gao, Lin Chen, Jun Li, Chengcai Li, Lin Zhu
Summary: This study improved the estimation of surface reflectance relationship by considering land cover, NDVI, and scattering angle, and retrieved AOD over land using AHI/H8 observations in 2018. The quality of AOD retrievals was evaluated using ground-based AOD observations from global AErosol RObotic NETwork (AERONET) and China Aerosol Research Network (CARSNET), showing good agreement with ground-based measurements and better performance in depicting diurnal variation compared to JAXA H8 AOD.
ATMOSPHERIC RESEARCH
(2021)
Article
Meteorology & Atmospheric Sciences
Liang Chang, Jing Li, Yiqi Chu, Yueming Dong, Wangshu Tan, Xianjun Xu, Jingjing Ren, Xiaoqing Tian, Chong Li, Zhe Liu, Gang Zhao, Chengcai Li
Summary: This study reports the seasonal and diurnal variability of major aerosol optical parameters in an urban site in Beijing from September 2017 to August 2019. The annual average values of PM2.5 and PM10 mass concentrations, scattering coefficient, and absorbing coefficient were significantly lower than previously reported, with the highest aerosol concentrations observed in the spring season.
ATMOSPHERIC RESEARCH
(2021)
Article
Environmental Sciences
Shuya Hu, Gang Zhao, Tianyi Tan, Chengcai Li, Taomou Zong, Nan Xu, Wenfei Zhu, Min Hu
Summary: The annual mean PM2.5 mass concentration in Beijing, China has decreased due to strict emission controls, but the nitrate (NO3-) mass fraction in PM2.5 has been increasing gradually. The study found that NO3- became the main constituent of PM2.5 during haze pollution episodes, and its contribution to visibility reduction increased with higher air pollution levels. Efforts to reduce particulate NO3- and its precursors are crucial for improving air quality and visibility in Beijing.
ENVIRONMENTAL POLLUTION
(2021)
Article
Geochemistry & Geophysics
Xiaoqing Tian, Ling Gao, Jun Li, Lin Chen, Jingjing Ren, Chengcai Li
Summary: This study develops a novel algorithm for retrieving aerosol optical depth (AOD) from AVHRR using machine learning. The algorithm is compared and validated against MODIS, showing good performance in various conditions. This research is important for long-term monitoring of the role of aerosols in global climate change.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Jingjing Ren, Wangshu Tan, Xiaoqing Tian, Zhaolong Wu, Chengcai Li, Jing Li, Chunsheng Zhao, Dong Liu, Ling Kang, Tong Zhu
Summary: In this study, the vertical distribution and temporal evolution of ALWC were determined by HSRL, and its impact on aerosol optical parameters and visibility deterioration was highlighted. The potential of ALWC in promoting aerosol extinction coefficients and enhancing the cooling effect on the climate system was also demonstrated.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Multidisciplinary Sciences
Nanchao Wang, Kai Zhang, Xue Shen, Yuan Wang, Jing Li, Chengcai Li, Jietai Mao, Aleksey Malinka, Chuanfeng Zhao, Lynn M. Russell, Jianping Guo, Silke Gross, Chong Liu, Jing Yang, Feitong Chen, Lingyun Wu, Sijie Chen, Ju Ke, Da Xiao, Yudi Zhou, Jing Fang, Dong Liu
Summary: Aerosol-cloud interaction (ACI) is complex and difficult to represent in current climate models due to inadequate observational capability. In this study, a dual-field-of-view (FOV) high-spectral-resolution lidar (HSRL) was introduced to simultaneously profile aerosol and water cloud properties. Observations using this instrument, verified by simulation and other techniques, investigated the interactions between aerosol loading and water cloud microphysical properties. The results provide significant additions to understanding ACI processes and suggest that aerosol-induced cloud water increase may be canceled out by enhanced evaporation.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Environmental Sciences
Nanchao Wang, Da Xiao, Igor Veselovskii, Yuan Wang, Lynn M. Russell, Chuanfeng Zhao, Jianping Guo, Chengcai Li, Silke Gross, Xu Liu, Xueqi Ni, Lizhou Tan, Yuxuan Liu, Kai Zhang, Yicheng Tong, Lingyun Wu, Feitong Chen, Binyu Wang, Chong Liu, Weibiao Chen, Dong Liu
Summary: Despite their small size, fine-mode aerosols play a crucial role in climate change and human health. Currently, there are limitations in accurately retrieving the microphysical properties of fine-mode aerosols using lidar-based methods. To overcome this, researchers have developed a new machine learning method called the FAST method, which improves the retrieval of these properties with high efficiency and accuracy.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Changqing Lin, Yushan Song, Peter K. K. Louie, Zibing Yuan, Ying Li, Minghui Tao, Chengcai Li, Jimmy C. H. Fung, Zhi Ning, Alexis K. H. Lau, Xiang Qian Lao
Summary: The lockdown during the COVID-19 pandemic provides an opportunity to assess the spatial disparity of NO2 reduction on O3 formation in the Greater Bay Area. Despite the increase in O3 levels, NOx emission controls reduce the overall health risk in most regions.
ATMOSPHERIC POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Da Xiao, Nanchao Wang, Sijie Chen, Lingyun Wu, Detlef Mueller, Igor Veselovskii, Chengcai Li, Eduardo Landulfo, Venkataraman Sivakumar, Jing Li, Huizheng Che, Jing Fang, Kai Zhang, Binyu Wang, Feitong Chen, Xianzhe Hu, Xiaotao Li, Weize Li, Yicheng Tong, Ju Ke, Lan Wu, Chong Liu, Dong Liu
Summary: Dust particles from arid desert regions can be transported long distances, posing risks to climate, environment, social economics, and human health. Limited observations of dust aerosol properties hinder our understanding of aerosol mixing, stratification, aerosol-cloud interactions, and environmental impacts. This study presents the first high-spectral-resolution lidar observation providing continuous profiles of mass concentration and optical properties of dust aerosols and contributes to our understanding of their contribution to the environment and dust aerosol databases.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Tianning Su, Zhanqing Li, Chengcai Li, Jing Li, Wenchao Han, Chuanyang Shen, Wangshu Tan, Jing Wei, Jianping Guo
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2020)