Results 61 to 70 of about 307 (173)

Effects of Wind Turbulence on Coherent Doppler Lidar Performance

Journal of Atmospheric and Oceanic Technology, 1997
Abstract The effects of wind turbulence on pulsed coherent Doppler lidar performance are investigated theoretically and with computer simulations. The performance of velocity estimators is determined for the case of a single realization of a wind field described by a Kolmogorov spatial spectrum and for an ensemble average over many realizations.
openaire   +1 more source

Applications of Cell-Ratio Constant False-Alarm Rate Method in Coherent Doppler Wind Lidar

Atmosphere, 2016
A cell-ratio constant false-alarm rate (CR-CFAR) method for detecting the Doppler frequency shift is proposed to improve the accuracy of velocity measured by coherent Doppler wind lidar (CWL) in low signal-to-noise ratio (SNR) environments.
Hao Zhu, Lingbing Bu, Haiyang Gao, Xingyou Huang, Wentao Zhang   +4 more
doaj   +1 more source

Identification and Forecasting of Typical Wind Shear and Shear Line Based on Two‐Dimensional Wind Field

Meteorological Applications, Volume 33, Issue 4, July/August 2026.
This study proposes a lidar‐based method for wind shear and shear line identification and forecast using two‐dimensional wind vector. Airport experiments successfully identify shear lines induced by gust front and severe convection, achieving shear lines movement forecast.
Anning Chen, Jinlong Yuan, Shuo Zhang, Yue Liu, Jiadong Hu, Jiawei Qiu, Haiyun Xia   +6 more
wiley   +1 more source

First Lidar Observations of Ionosphere‐Thermosphere‐Mesosphere (ITM) Na Transition Layer (∼120–95 km): Regular Occurrence Over Boulder (40.13°N, 105.24°W) and Possible Formation Mechanisms

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract Using lidar observations of 12 monthly composites of normalized Na density ratios, we have discovered an Ionosphere‐Thermosphere‐Mesosphere (ITM) Na transition layer from ∼120 to ∼95 km over Boulder, Colorado. The transition layer occurs regularly in all months with a distinct separation from the predawn TINa layer and exhibits coherent ...
Yingfei Chen, Xinzhao Chu
wiley   +1 more source

Water Vapor, Cloud and Aerosol Properties on the Tibetan Plateau Using Multi-Lidar Measurements

EPJ Web of Conferences, 2016
The 3rd Tibetan Plateau atmospheric expedition experiment campaign were operated in the Tibetan Plateau during July and August 2014 by utilizing the Water vapor, Cloud and Aerosol Lidar (WVCAL), Coherent Doppler Wind Lidar and ceilometer VAISALA CL31 ...
Wu Songhua, Dai Guangyao, Wang Dongxiang, Zhai Xiaochun, Song Xiaoquan   +4 more
doaj   +1 more source

Low-Level Wind Shear Identification along the Glide Path at BCIA by the Pulsed Coherent Doppler Lidar

Atmosphere, 2020
Low-level wind shear is usually to be a rapidly changing meteorological phenomenon that cannot be ignored in aviation security service by affecting the air speed of landing and take-off aircrafts. The lidar team in Ocean University of China (OUC) carried
Hongwei Zhang, Xiaoying Liu, Qichao Wang, Jianjun Zhang, Zhiqiang He, Xi Zhang, Rongzhong Li, Kailin Zhang, Junwu Tang, Songhua Wu   +9 more
doaj   +1 more source

GNSS Zenith Wet Delay as a Boundary Layer Diagnostic: Regime‐Dependent Turbulence Signatures From Large Eddy Simulation and Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 12, 28 June 2026.
Abstract Global Navigation Satellite Systems (GNSS) provide continuous measurements of zenith wet delay (ZWD), reflecting column‐integrated atmospheric water vapor. While the slowly varying ZWD is routinely assimilated in numerical weather prediction, the rapid fluctuations on timescales of seconds to minutes that arise from boundary‐layer turbulence ...
Gaël Kermarrec, Tim Schrader, Xavier Calbet, Zhiguo Deng   +3 more
wiley   +1 more source

Reconstructing Marine Boundary Layer Jets Over the South China Sea Using Machine Learning

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract Marine boundary layer jets (MBLJs) over the South China Sea (SCS) play a critical role in coastal heavy rainfall, yet their structure remains uncertain due to limited wind observations over the ocean. Here, we develop a U‐Net–based reconstruction framework to estimate 950‐hPa winds from satellite‐derived sea surface winds, providing a ...
Yican Lin, Yu Du, Jiuke Wang
wiley   +1 more source

Erosion of granular sediments by submerged impinging jets: Particle size effects and cohesion onset

AIChE Journal, Volume 72, Issue 6, June 2026.
Abstract This study investigates the erosion behavior and modeling of glass particle beds under impinging jet conditions, with a focus on particle size effects and the onset of cohesion. Ultrasonic profiling is implemented to scan and measure static crater profiles.
Ahmad Mohamadiyeh, Jeffrey Peakall, Michael Fairweather, Martyn Barnes, Timothy N. Hunter   +4 more
wiley   +1 more source

Three‐Year Characterization of Boundary Layer Dynamics From GNSS Zenith Wet Delay Spectral Analysis

Atmospheric Science Letters, Volume 27, Issue 6, June 2026.
Three years of GNSS zenith wet delay observations at Payerne reveal that spectral parameters—cutoff frequency α and variance σ2—capture robust seasonal cycles in boundary layer turbulence (R2 = 0.54 for α). Their inverse coupling tightens to r = −0.82 under summer convection, encoding regime‐dependent physics.
Gaël Kermarrec, Xavier Calbet, Zhiguo Deng   +2 more
wiley   +1 more source