Results 11 to 20 of about 711,225 (168)

Spatiotemporal Distribution of Atmospheric Ducts in Alaska and Its Relationship with the Arctic Vortex

International Journal of Antennas and Propagation, 2020
In this paper, global position system high-resolution sounding data from 1998 to 2008 were used to statistically analyze the spatiotemporal distribution and determine the probability, thickness, and intensity of atmospheric ducts at 12 stations in Alaska.
Yanbo Mai, Zheng Sheng, Hanqing Shi, Qixiang Liao, Wei Zhang   +4 more
doaj   +2 more sources

Arctic Atmospheric Ducting Characteristics and Their Connections with Arctic Oscillation and Sea Ice

Atmosphere, 2022
Atmospheric ducting is an anomalous atmospheric structure that affects electromagnetic wave propagation. In the context of global warming, the navigation capacity of the Arctic is increased, and the atmospheric duct can affect communication and ...
Ting Qin, Bo Su, Li Chen, Junfeng Yang, Hulin Sun, Jing Ma, Wenhao Yu   +6 more
doaj   +2 more sources

Statistical Analysis of Atmospheric Ducts in the Yellow and Bohai Seas of China and Study of Their Electromagnetic Wave Propagation Characteristics

Atmosphere
Atmospheric ducts play a critical role in the propagation of electromagnetic waves by minimizing signal loss and extending transmission distances, which is essential for radar, communication, and navigation systems.
Xiao Yang, Lei Li, Leke Lin, Rui Zhang, Shuaishuai Liang, Zhenwei Zhao   +5 more
doaj   +2 more sources

Investigating the Temporal and Spatial Characteristics of Lower Atmospheric Ducts in the Arctic via Long-Term Numerical Simulations

Atmosphere
In this study, a diagnostic model for lower atmospheric ducts was developed using the polar weather research and forecasting model. A five-year simulation was then conducted across the entire Arctic region to investigate the temporal and spatial ...
Jinyue Wang, Xiaofeng Zhao, Jing Zou, Pinglv Yang, Bo Wang, Shuai Yang, Zhijin Qiu, Zhiqian Li, Tong Hu, Miaomiao Song   +9 more
doaj   +3 more sources

Investigating the spatio–temporal characteristics of lower atmospheric ducts across the China seas by performing a long–term simulation using the WRF model

Frontiers in Marine Science
In this work, a diagnostic scheme for lower atmospheric ducts was established based on the Weather Research and Forecasting (WRF) model. More specifically, a 10-year simulation test was conducted for the China seas to investigate the spatio-temporal ...
Qi Liu, Xiaofeng Zhao, Jing Zou, Tong Hu, Zhijin Qiu, Bo Wang, Zhiqian Li, Chaoran Cui, Rui Cao   +8 more
doaj   +3 more sources

Development of a Numerical Prediction Model for Marine Lower Atmospheric Ducts and Its Evaluation across the South China Sea

Journal of Marine Science and Engineering
The Coupled Ocean–Atmosphere–Wave–Sediment Transport (COAWST) model serves as the foundation for creating a forecast model to detect lower atmospheric ducts in this study.
Qian Liu, Xiaofeng Zhao, Jing Zou, Yunzhou Li, Zhijin Qiu, Tong Hu, Bo Wang, Zhiqian Li   +7 more
doaj   +3 more sources

A Random Forest Algorithm Combined with Bayesian Optimization for Atmospheric Duct Estimation

Remote Sensing, 2023
Inversion of atmospheric ducts is of great importance in the field of performance evaluation for radar and communication systems. Since the model parameters in machine learning play a crucial role in prediction performance, this paper develops a random ...
Chao Yang, Yulu Wang, Aoxiang Zhang, Hualei Fan, Lixin Guo   +4 more
doaj   +3 more sources

Validation of atmospheric evaporation duct in the eastern Indian Ocean

Frontiers in Earth Science
An atmospheric duct is an anomalous atmospheric structural phenomenon that causes trap refraction in the troposphere to change the propagation paths and ranges of electromagnetic waves, thereby increasing the detection distances of radar and other ...
Zhe Qi, Zhe Qi, Huabin Mao, Huabin Mao, Chunhua Qiu, Yongfeng Qi, Yongfeng Qi   +6 more
doaj   +2 more sources

Exploring Marine Atmospheric Ducts: Current Sensing and Emerging Trends

Remote Sensing
Tropospheric refraction significantly impacts the propagation of ultrashort- and microwave-frequency radio waves over marine environments. Atmospheric ducting, the most common super-refractive structure, allows radio waves to travel over the horizon ...
Jin-Peng Zhang, Yu-Jing Li, Han-Jie Ji, Huai-Yun Peng, Xiang-Ming Guo, Yu-Sheng Zhang   +5 more
doaj   +2 more sources

Statistical Analysis of Hybrid Atmospheric Ducts over the Northern South China Sea and Their Influence on Over-the-Horizon Electromagnetic Wave Propagation

Journal of Marine Science and Engineering, 2023
Atmospheric ducts are special super-refractive atmospheric structures that can cause over-the-horizon propagation of electromagnetic waves. Different types of atmospheric ducts have different influences on electromagnetic wave propagation.
Yang Shi, Shuwen Wang, Fan Yang, Kunde Yang   +3 more
doaj   +1 more source