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
Geosciences, Multidisciplinary
Yuzhi Liu, Jianping Huang, Tianhe Wang, Jiming Li, Hongru Yan, Yongli He
Summary: This paper reviews the progress in the study of aerosol-cloud interactions over the Tibetan Plateau (TP) and discusses the challenges for further understanding this interaction in the future.
EARTH-SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Jing Wang, Bida Jian, Guoyin Wang, Yuxin Zhao, Yarong Li, Husi Letu, Min Zhang, Jiming Li
Summary: This study systematically quantifies the radiative contribution of cloud phases and precipitation over the Tibet Plateau using data from CloudSat. Statistical results show that ice clouds are more frequent during the cold season, mixed-phase clouds dominate the warm season, and supercooled water clouds have a larger distribution during the warm season in the eastern part of the TP.
Article
Geosciences, Multidisciplinary
Yang Zhao, Jiming Li, Weiyuan Zhang, Cong Deng, Yarong Li
Summary: This study evaluates the response of clouds to surface warming in the Tibetan Plateau using models and satellite data, and finds significant underestimation of cloud response in the models.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Environmental Sciences
Jiayan Yu, Lingshuo Meng, Yang Chen, Huifang Zhang, Jianguo Liu
Summary: Concerns have been raised about near-surface ozone pollution in Lhasa, with limited understanding of its formation and distribution. Volatile organic compounds and nitrogen oxides are identified as crucial factors in controlling ozone formation, and reducing anthropogenic emissions is an effective way to decrease ozone concentrations.
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
Environmental Sciences
Jiawen Wu, Zhengkun Qin, Juan Li, Zhiwen Wu
Summary: This study proposes a cloud detection scheme for distinguishing cloudy and clear-sky data over the Tibetan Plateau using AMSU-A and MHS data. Results show that the new scheme can identify over 80% of clouds on average, but the detection rate decreases to 72% for areas with terrain higher than 5 km. The method has lower detection rates for high-level clouds.
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
Dingdong Li, Yonghua Wu, Barry Gross, Fred Moshary
Summary: Continuous observation and quantitative retrieval of aerosol backscatter coefficients are crucial for studying air quality and climate in urban areas like New York City. This study calibrates a ceilometer system constant and evaluates the calibrated profiles using various methods, showing stable results with good consistency. The retrieval of aerosol backscatter coefficients is validated using co-located lidar retrievals, demonstrating a high correlation in the planetary boundary layer.
Article
Meteorology & Atmospheric Sciences
Pengguo Zhao, Wen Zhao, Liang Yuan, Xin Zhou, Fei Ge, Hui Xiao, Peiwen Zhang, Yuting Wang, Yunjun Zhou
Summary: The effect of aerosol on liquid cloud microphysical properties over the Tibetan Plateau is studied, revealing distinct differences between the northern and southern regions. When the aerosol loading increases, the liquid cloud droplet effective radius increases in the northern region but decreases in the southern region. In addition, the influence of aerosol on liquid clouds is found to be dependent on different meteorological conditions and aerosol types in the two regions.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Pengguo Zhao, Hui Xiao, Jia Liu, Yunjun Zhou
Summary: The study revealed varying trends of liquid water and ice water over the Tibetan Plateau in different seasons, with precipitation relying more on ice water clouds. The Convective Available Potential Energy (CAPE) and low-tropospheric relative humidity (RH) were found to significantly influence precipitation efficiency (PE).
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2022)
Article
Environmental Sciences
Wenjing Xu, Daren Lyu
Summary: The Tibetan Plateau plays a significant role in influencing atmospheric circulation and climate systems through its clouds. Despite challenges in retrieving cloud properties due to the high altitude and complex terrain, comparison between AGRI and MODIS showed discrepancies in cloud detection and cloud top height retrievals, with AGRI tending to miss lower clouds and underestimating cloud top height compared to MODIS.
Article
Environmental Sciences
Yafei Yan, Yimin Liu, Xiaolin Liu, Xiaocong Wang
Summary: By analyzing and comparing the effects of cloud microphysics on the vertical structures of cloud radiative effects over the Tibetan Plateau and the Arctic, it was found that there are more cloud water particles with larger sizes over the Tibetan Plateau, leading to stronger shortwave and longwave CRE compared to the Arctic. The vertical structures of CRE at high altitudes are primarily controlled by cloud ice water, while those at low altitudes are influenced by cloud liquid and mixed-phase water, resulting in distinct heating and cooling layers.
Article
Meteorology & Atmospheric Sciences
Guangcan Chen, Xiangdong Zhang, Yunfei Fu
Summary: This study analyzed the diurnal variations in clouds and radiation budgets over four subareas of the Tibetan Plateau during summer. The results showed that cloud amount decreased from southeast to northwest and was larger during daytime than nighttime. High-clouds developed in the afternoon and dissipated after sunrise, while low clouds developed after sunrise and dissipated in the afternoon. The net radiation budget at the top-of-atmosphere reached its maximum at noon. The surface net radiation budget was positive in the daytime and negative at nighttime. The findings of this study help improve our understanding of the energy cycle of the Tibetan Plateau.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Xingxu Zhou, Chao Zhang, Yunying Li, Zhiwei Zhang
Summary: This paper explores and compares the gust characteristics at two sites, Xining in the eastern Tibetan Plateau and Qingdao on the coast in China, using Doppler lidar data. The results show that the gusts in Xining are more intense and occur at a higher height compared to Qingdao. Turbulence intensity is responsible for the differences in gust, suggesting high turbulence in the eastern part of the Tibetan Plateau. These findings provide observational evidence for studying the impact of wind gusts on complex terrains such as the Tibetan Plateau.
Article
Optics
Qi Liu, Songhua Wu, Bingyi Liu, Jintao Liu, Kailin Zhang, Guangyao Dai, Junwu Tang, Ge Chen
Summary: A ship-borne variable-FOV, dual-wavelength, polarized ocean lidar system is designed to obtain high-precision vertical profile measurements of the polarization and optical properties of natural seawater. The system has demonstrated potential for exploring various ocean compositions using multi-wavelength and polarization lidar measurements.
Article
Environmental Sciences
Jiaxin Liu, Xiaoquan Song, Wenrui Long, Yiyuan Fu, Long Yun, Mingdi Zhang
Summary: The Doppler lidar system is playing an increasingly important role in the research of atmospheric boundary layers and sea-land breeze. It can accurately capture the wind profiles and turbulent characteristics, providing valuable information for understanding the impact of sea breeze on air quality.
Article
Meteorology & Atmospheric Sciences
Xin Shao, Ning Zhang, Zhen Peng, Kun Zhao, Yanhong Luo, Xiaoquan Song
Summary: This study examines the variation in the drag coefficient with wind speed over the land surface and finds a significant decrease in the drag coefficient, roughness length, and zero plane displacement when the wind speed is greater than approximately 15 m s(-1). The analysis shows that the drag coefficient is positively related to the coherence of the turbulent structures and that the momentum transport modes change at 15 m s(-1). Large-scale coherent structures dominate the momentum transfer in strong wind conditions, while small eddies contribute significantly in low to moderate wind conditions. The formation of inefficient large coherent eddies is likely due to the existence of inverse energy cascade.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Environmental Sciences
Haitao Zheng, Youwen Sun, Tao Luo, Xueling Cheng, Shiyong Shao, Shouyin Zheng, Bangyi Tao, Bin Chen, Qianguang Tu, Kan Huang, Bingbing Wang, Mian Wang, Xiaoquan Song, Tianshu Zhang, Yin Cheng, Jianguo Liu
Summary: Accurate and comprehensive knowledge of the atmospheric environment and its evolution within the coastal ocean boundary layer are necessary for understanding the sources, chemical mechanisms, and transport processes of air pollution in land, sea, and atmosphere. We present an overview of coastal ocean boundary layer detection technology and equipment in China and summarize the progress and main achievements in recent years. China has developed a series of coastal ocean boundary layer detection technologies, including Light Detection and Ranging (LIDAR), turbulent exchange analyzer, air-sea flux analyzer, stereoscopic remote sensing of air pollutants, and oceanic aerosol detection equipment to address the technical bottleneck caused by harsh environmental conditions in coastal ocean regions. Advances in these technologies and equipment have provided scientific assistance for addressing air pollution issues and understanding land-sea-atmosphere interactions over coastal ocean regions in China. In the future, routine atmospheric observations should cover the coastal ocean boundary layer of China.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2023)
Article
Optics
Xiang Jin, Xiaoquan Song, Yawen Yang, Mian Wang, Shiyong Shao, Haitao Zheng
Summary: This study estimates turbulence parameters in the marine atmospheric boundary layer using observation data and numerical models, and investigates their temporal and spatial variations. The results show that the numerical model can simulate turbulence parameters well, but there is still some deviation between the measured and simulated values due to the uncertainty of the model.
Article
Physics, Multidisciplinary
Chao Chen, Xiaoquan Song, Zhangjun Wang, Yubao Chen, Xiaopeng Wang, Zhichao Bu, Xi Zhang, Quanfeng Zhuang, Xin Pan, Hui Li, Feng Zhang, Xiufen Wang, Xianxin Li, Ronger Zheng
Summary: This study introduces a multi-wavelength aerosol lidar (MWAL) and its calibration methods. The observations of a haze process using lidar data and other meteorological measurements are analyzed to investigate the temporal and spatial characteristics of haze, the influence of aerosols on relative humidity, and the sources of pollutants.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Xiangcheng Chen, Guangyao Dai, Songhua Wu, Jintao Liu, Bin Yin, Qichao Wang, Zhiyu Zhang, Shengguang Qin, Xitao Wang
Summary: In this study, a 1550 nm coherent high-spectral-resolution lidar is developed for measuring the optical properties of aerosols and atmospheric wind profiles. A coherent frequency discriminator based on the fast Fourier transform is designed to separate the backscatter spectra and retrieve the wind velocity. A spectrum correction algorithm is proposed to recover interfered spectra. Field observations show good agreement with the model, indicating the effectiveness of the lidar.
Article
Optics
Mingquan Gao, Bin Yin, Yanzhi Lv, Guofeng Sang, Benran Hou, Haisu Li, Muguang Wang, Songhua Wu
Summary: In this paper, a SLM dual-wavelength switchable erbium-doped fiber laser based on PMFBG-FP and MSCs is proposed. By stretching the PMFBG, a highly stable and tunable dual-wavelength output is achieved.
Article
Meteorology & Atmospheric Sciences
Chengfeng Liu, Hao Li, Haitao Zheng, Guochen Wang, Xiaofei Qin, Jia Chen, Shengqian Zhou, Da Lu, Guoping Liang, Xiaoquan Song, Yusen Duan, Jianguo Liu, Kan Huang, Congrui Deng
Summary: This study investigated the spatiotemporal variations and sources of aminiums over the Bohai Sea. The results showed that the ocean origins play a dominant role in the generation of aminiums, with the seawater organic nitrogen reservoir being the main contributor. Additionally, the acid-base neutralization process in the aqueous phase was identified as critical for the transformation of gaseous amines to their particulate phase.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Optics
Hongwei Zhang, Yan He, Ziwang Li, Xiangcheng Chen, Guangyao Dai, Bin Yin, Junwu Tang, Weibiao Chen, Songhua Wu
Summary: This paper presents an in-situ laser Doppler current probe (LDCP) capable of simultaneously measuring micro-scale subsurface current speed and characterizing micron particles. The LDCP acts as an extension sensor for laser Doppler anemometry (LDA). By utilizing a dual wavelength diode pumped solid state laser, the LDCP achieves the simultaneous measurement of two components of current speed and obtains the size distribution of suspended particles. Experimental results demonstrate that the LDCP is an effective instrument for capturing micro-scale subsurface ocean current speed and retrieving the size distribution of small suspended particles.
Article
Meteorology & Atmospheric Sciences
Hao Li, Xiaofei Qin, Jia Chen, Guochen Wang, Chengfeng Liu, Da Lu, Haitao Zheng, Xiaoquan Song, Qianqian Gao, Jian Xu, Yucheng Zhu, Jianguo Liu, Xiaofei Wang, Congrui Deng, Kan Huang
Summary: Understanding the evolution of brown carbon (BrC) in the atmosphere is crucial for studying its climate effects. This study used a novel in-situ BrC continuous observation system to measure water-soluble BrC absorption (Abs(WS-BrC)) in an offshore island over the Bohai Sea in the winter of 2020. The results showed that the abundance of Abs(WS-BrC) before the cold wave was more than twice higher than that after the cold wave, mainly due to the suppressed formation of secondary WS-BrC. Diurnal patterns of Abs(WS-BrC) exhibited nighttime peaks, which were attributed to primary emissions and aqueous-phase processes.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Optics
Huixin He, Mingyu Shi, Junwu Tang, Songhua Wu
Summary: Monte Carlo techniques are widely used in polarized light simulation. There are two main types of sampling strategies for scattering direction based on different preconditions: scalar sampling method and polarized sampling approaches. Efficient scattering sampling method is essential for the coupling simulation of the atmosphere and ocean in oceanic lidar polarized simulation.
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
Engineering, Electrical & Electronic
Guofeng Sang, Bin Yin, Ran Yan, Muguang Wang, Haisu Li, Yanzhi Lv, Shilin Liu, Qichao Wang, Songhua Wu
Summary: We have proposed and demonstrated a compact three-wavelength fiber laser sensor designed for simultaneous measurement of underwater pH, salinity, temperature, and axial strain, emphasizing miniaturization and integration. The sensor shows favorable repeatability, stability, and linearity.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Songhua Wu, Kangwen Sun, Guangyao Dai, Xiaoye Wang, Xiaoying Liu, Bingyi Liu, Xiaoquan Song, Oliver Reitebuch, Rongzhong Li, Jiaping Yin, Xitao Wang
Summary: This study compares wind observations from ground-based coherent Doppler wind lidars with those from the Aeolus spaceborne wind lidar. The results show deviations between Aeolus and the lidars on certain product baselines, but significant improvements are achieved with continuous calibration and updates. Additionally, the study highlights the impact of vertical velocity on the wind velocity retrieval from Aeolus.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2022)
