Results 61 to 70 of about 932 (178)

Design of a Non-scanning Lidar for Wind Velocity and Direction Measurement

EPJ Web of Conferences, 2016
A Doppler lidar system for wind velocity and direction measurement is presented. The lidar use a wide field of view (FOV) objective lens as an optical antenna for both beam transmitting and signal receiving.
Liu Bo, Peng Zhangxian
doaj   +1 more source

Flood‐Scale Bedload Transport Dynamics From Acoustic Monitoring Compared With 2D Hydro‐Sedimentary Modeling

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 8, August 2026.
Abstract Accurate estimation of bedload fluxes is critical to understanding sediment transport processes and associated channel evolution in gravel‐bed rivers, however, traditional direct measurements using samplers are time‐consuming and complex. To overcome these limitations, new indirect methods have been developed to estimate fluxes from bedload ...
G. Piasny, P.‐A. Garambois, T. Geay, S. Zanker, L. Schmitt   +4 more
wiley   +1 more source

Doppler Winds Lidar Technology Development and Demonstration [PDF]

Space 2005, 2005
High resolution (both spatial and temporal) and accurate tropospheric wind profiling from spaceborne platforms has been one of the most wanted capability by both DOD and civilian user communities to support weather forecasting, national defense and homeland security applications.
Wang, Jinxue, Dehring, Michael, Hovis, Floyd, Moore, Berrien   +3 more
openaire   +1 more source

Wind Measurements up to 25km based on Aerosol Backscatter with a Novel, Multi Field of View Lidar [PDF]

EPJ Web of Conferences
We present the first set of simultaneous horizontal and vertical wind measurements obtained from aerosol backscatter, covering altitudes between 3 and 25 km.
Mense Thorben H., Höffner Josef, Froh Jan, Eixmann Ronald, Mauer Alsu, Baumgarten Gerd, Wing Robin, Lübken Franz-Josef, Munk Alexander   +8 more
doaj   +1 more source

Saturation Effects in Narrowband Resonance Lidar Measurements, Part 1: Theoretical Consideration of Sodium, Iron, and Helium Lidar Systems

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Atmospheric resonance lidars targeting metallic species in the mesosphere and lower thermosphere have yielded insights into the dynamics of the middle and upper atmosphere for over 50 years. Recently, the technique has been extended to the metastable helium layer, which reaches up to 1,000 km or above.
C. Geach, B. Kaifler
wiley   +1 more source

Turbulence Measurements with Dual-Doppler Scanning Lidars

Remote Sensing, 2019
Velocity-component variances can be directly computed from lidar measurements using information of the second-order statistics within the lidar probe volume.
Alfredo Peña, Jakob Mann
doaj   +1 more source

Saturation Effects in Narrowband Resonance Lidar Measurements, Part 2: Potassium Lidar Systems and Experimental Results

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract Resonance lidars targeting the D1 ${D}_{1}$ resonance line of potassium at 770 nm have been employed over the past 5 decades to yield numerous insights into the dynamics of the middle and upper atmosphere. It has long been recognized that these measurements can be severely affected by nonlinear behavior in the scattering process, that is ...
C. Geach, B. Kaifler, Josef Höffner, G. Baumgarten   +3 more
wiley   +1 more source

Exploring the Influence of Morphologic Heterogeneity and Discharge on Downstream Transport in Streams With Multiple Logjams: 2. Insight From Numerical Models

Water Resources Research, Volume 62, Issue 8, August 2026.
Abstract Logjams in streams create complex morphologic features such as pools, bars, and branching channels that enhance stream water storage and force water through the streambed. We examine how these features alter solute retention in stream corridors as discharge increases, backwaters expand, new channels activate, and jams become more submerged ...
Xiaolang Zhang, Audrey H. Sawyer, Kamini Singha, Ellen Wohl   +3 more
wiley   +1 more source

Analysis of Smoke Transport Over the Northeast US Caused by Wildfires in Canada During June 2023—Leveraging the HRRR‐Smoke Model Predictions and Remote Sensing Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract The intensification of wildland fires across portions of Canada in early June 2023 led to significant smoke transport into the eastern United States, resulting in poor air quality and reduced visibility. Significant degradation of air quality was evident from PM2.5 surface measurements as the smoke plume moved southwards, which was confirmed ...
Y. L. Pichugina, E. J. Strobach, A. W. Brewer, R. Ahmadov, P. S. Bhattacharjee, E. P. James, A. J. Schnell, B. Carroll, S. Baidar, S. Sandberg   +9 more
wiley   +1 more source

Postfrontal Deep Convection Over the Southern Ocean and Orographic Precipitation Enhancement Over Tasmania

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract The orographic precipitation enhancement (OPE) generated within wintertime post‐frontal air masses is a prominent climate feature of Tasmania. This study investigates a passage of a cold sector of a mid‐latitude cyclone over the Southern Ocean (SO) and Western Tasmania (WTAS) observed from 2100 UTC 11 July to 0300 UTC 13 July.
Artur Gevorgyan, Steven Siems, Yi Huang, Luis Ackermann, T. Alinejadtabrizi   +4 more
wiley   +1 more source