Dr. Xiangyuan Liu Profile

Dr. Xiangyuan Liu

at West Anhui University, China

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Publications (4)

Proceedings Article | 30 April 2024 Paper

Exploration of the variation characteristics of greenhouse gas CO2 and CH4 concentrations in the Hefei region

DanDan Liu, XiangYuan Liu, Ke Tang, Yu Ping, Zhiliang Wei

Proceedings Volume 13157, 1315715 (2024) https://doi.org/10.1117/12.3018539

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The rise in greenhouse gas concentrations has been identified as a primary driver of global warming, leading to adverse effects such as rising sea levels and droughts. In response, understanding the dynamics of greenhouse gas concentration changes has become pivotal in the quest to effectively combat climate change and mitigate the adverse effects of global warming. This study utilizes data from the GOSAT satellite to analyze the trends in global CO₂ and CH₄ concentrations from 2010 to 2022. Furthermore, the time series and seasonal variation characteristics of greenhouse gas concentrations of CO₂ and CH₄ in the Hefei area were studied, combined with the geographical environment of Hefei. To enhance comprehension, the article also assembles an HYSPLIT backward trajectory model to scrutinize the latent influences exerted by monsoon transport and atmospheric boundary layer conditions on greenhouse gas distributions. Over the course of the decade from 2010 to 2022, greenhouse gas concentrations in the Hefei region exhibited an unwavering upward trajectory, punctuated by conspicuous seasonal fluctuations, showcasing distinct seasonal variations that aligned with the observations of the ground-based observation network TCCON. The concentrations of CO₂ surged from 391.05 ppm to 417.98ppm, signifying a net gain of 26.930ppm, corresponding to an annual growth rate of approximately 2.4 ppm. Similarly, CH₄ concentrations underwent a net increase of 72 ppb, characterizing an annual growth rate of about 10.4 ppb. These figures underscore the relentless ascent of greenhouse gas concentrations, warranting immediate attention and action. The concentrations of greenhouse gases are subjected to a plethora of factors, encompassing both local biogenic and non-biogenic sources, the intricate patterns of monsoon-driven atmospheric transport, and the unique characteristics of the atmospheric boundary layer. The findings emanating from this comprehensive study are poised to serve as the bedrock upon which Hefei City can formulate and refine its strategies for greenhouse gas emission reduction. Furthermore, the study emphasizes the impact of monsoon transport patterns and atmospheric boundary layer conditions, which can significantly affect the dispersion and accumulation of greenhouse gases in the region. Understanding these factors is crucial for devising effective strategies to mitigate greenhouse gas emissions.

Proceedings Article | 17 May 2019 Paper

Characteristics of return photons from the polychromatic laser guide star excited by a long pulse laser with 330 nm wavelength

Xiangyuan Liu, Xianmei Qian, Wenyue Zhu, Ruizhong Rao, Xiangfei Wei, Chengling Lu

Proceedings Volume 11170, 1117020 (2019) https://doi.org/10.1117/12.2533574

KEYWORDS: Sodium, Photons, Laser guide stars, Atmospheric turbulence, Transmittance, Mesosphere

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Proceedings Article | 8 March 2017 Paper

Effects of atmospheric turbulence on the return photon flux of sodium laser guide star

Xiangyuan Liu, Xianmei Qian, Chuanyu Fan, Chengtao Du, Chengling Lu, Lei Zhang, Huan Yang

Proceedings Volume 10255, 102553S (2017) https://doi.org/10.1117/12.2267964

KEYWORDS: Atmospheric turbulence, Sodium, Laser guide stars, Atmospheric modeling, Chemical species, Mesosphere, Continuous wave operation, Atmospheric propagation, Optical simulations, Stochastic processes

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Proceedings Article | 26 January 2016 Paper

Numerical simulation research on sodium laser beacon imagings through the atmosphere turbulence

Xiangyuan Liu, Xianmei Qian, Suimeng Zhang, Minfu Zhao, Chaolong Cui, Honghua Huang

Proceedings Volume 9796, 979606 (2016) https://doi.org/10.1117/12.2228596

KEYWORDS: Sodium, Turbulence, Numerical simulations, Atmospheric modeling, Atmospheric turbulence, Telescopes, Point spread functions, Device simulation, Mesosphere, Photons

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