Oceanographic lidar profiles measured in an aerial survey were compared with in situ measurements of water optical properties made from a surface vessel. Experimental data were collected over a two-week period in May 2010 in East Sound, Washington. Measured absorption and backscatter coefficients were used with the volume-scattering function in a quasi-single-scattering model to simulate an idealized lidar return, and this was convolved with the measured instrument response to accurately reproduce the measured temporal behavior. Linear depth-dependent depolarization from the water column and localized depolarization from scattering layers are varied to fine tune the simulated lidar return. Sixty in situ measurements of optical properties were correlated with nearly collocated and coincident lidar profiles; our model yielded good matches (±3 dB to a depth of 12 m) between simulated and measured lidar profiles for both uniform and stratified waters. Measured attenuation was slightly higher (5%) than diffuse attenuation for the copolarized channel and slightly lower (8%) for the cross-polarized channel.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/AO.52.000786 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Aerosol transport and associated boundary layer thermodynamics under contrasting synoptic conditions over a semiarid site.
Sci Total Environ
January 2025
Department of Geosciences, Atmospheric Science Division, Texas Tech University, Lubbock, TX, USA; National Wind Institute, Texas Tech University, Lubbock, TX, USA. Electronic address:
Understanding the kinematics of aerosol horizontal transport and vertical mixing near the surface, within the atmospheric boundary layer (ABL), and in the overlying free troposphere (FT) is critical for various applications, including air quality and weather forecasting, aviation, road safety, and dispersion modeling. Empirical evidence of aerosol mixing processes within the ABL during synoptic-scale events over arid and semiarid regions (i.e.
View Article and Find Full Text PDFArticle Synopsis
- - A new dual-wavelength lidar system, called Wind Flux 3000, can independently monitor particulate matter (PM) transport flux and wind conditions, combining both aerosol and wind measurements effectively.
- - The system provides key data including the particulate extinction coefficient, wind speed, direction, and other atmospheric parameters, which helps in understanding the relationship between PM concentration and environmental factors.
- - Utilizing advanced ensemble learning techniques, the study developed models that outperformed traditional methods in predicting PM concentration, achieving strong correlations and reduced errors in test predictions.
Digitized Seedbed Soil Quality Assessment from Worn and Edge Hardened Cultivator Sweeps.
Sensors (Basel)
October 2024
Department of Materials Science and Engineering, Iowa State University, Ames, IA 50011, USA.
Tillage tools for seedbed soil management are often subjected to low stress abrasion wear, which could negatively affect seedbed quality and crop productivity. Limited studies exist that quantify the effects of worn tillage tools on seedbed quality and crop yield. This research investigated the influence of tillage tool wear on seedbed preparation by evaluating the effect of cultivator sweep wear on soil tilth utilizing a light detection and ranging (LiDAR) sensor.
View Article and Find Full Text PDFThe Use of Laser Sensing for Solving Meteorological Problems Related to Researching and Ensuring the Safety of Space Flights.
Sensors (Basel)
October 2024
Department of Laser Technology, Department of Radioelectronic Control Systems, Baltic State Technical University "VOENMEH", St. 1st Krasnoarmeyskaya, 1, St. Petersburg 190005, Russia.
This paper is devoted to the issue of using laser (lidar) sensing to determine wind speed and direction when solving practical problems during the analysis of meteorological conditions in the area around spaceports. This issue is relevant both for making decisions on the possibility of a safe launch of a launch vehicle and for conducting search and rescue operations using groups of manned and unmanned aerial vehicles. Based on numerical and experimental modeling, it is shown that lidars provide highly accurate measurements of wind speed profiles and allow for the determination of weak wind shear in vertical and horizontal directions.
View Article and Find Full Text PDFCatch the wind: Optimizing wind turbine power generation by addressing wind veer effects.
PNAS Nexus
November 2024
St. Anthony Falls Laboratory, University of Minnesota, Minneapolis, 2 Third Ave. SE Minneapolis, MN 55414, USA.
Wind direction variability with height, known as "wind veer," results in power losses for wind turbines (WTs) that rely on single-point wind measurements at the turbine nacelles. To address this challenge, we introduce a yaw control strategy designed to optimize turbine alignment by adjusting the yaw angle based on specific wind veer conditions, thereby boosting power generation efficiency. This strategy integrates modest yaw offset angles into the existing turbine control systems via a yaw-bias-look-up table, which correlates the adjustments with wind speed, and wind veer data.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!