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Record Details

Record 74 of 44709
Lidar Measurements of Tropospheric Wind Profiles with the Double Edge Technique
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Author and Affiliation:
Gentry, Bruce M.(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Li, Steven X.(Science and Engineering Services, Inc., Burtonsville, MD United States)
Korb, C. Laurence(NASA Goddard Space Flight Center, Greenbelt, MD United States)
Mathur, Savyasachee(Science and Engineering Services, Inc., Burtonsville, MD United States)
Chen, Huailin(Science and Engineering Services, Inc., Burtonsville, MD United States)
Abstract: Research has established the importance of global tropospheric wind measurements for large scale improvements in numerical weather prediction. In addition, global wind measurements provide data that are fundamental to the understanding and prediction of global climate change. These tasks are closely linked with the goals of the NASA Earth Science Enterprise and Global Climate Change programs. NASA Goddard has been actively involved in the development of direct detection Doppler lidar methods and technologies to meet the wind observing needs of the atmospheric science community. A variety of direct detection Doppler wind lidar measurements have recently been reported indicating the growing interest in this area. Our program at Goddard has concentrated on the development of the edge technique for lidar wind measurements. Implementations of the edge technique using either the aerosol or molecular backscatter for the Doppler wind measurement have been described. The basic principles have been verified in lab and atmospheric lidar wind experiments. The lidar measurements were obtained with an aerosol edge technique lidar operating at 1064 nm. These measurements demonstrated high spatial resolution (22 m) and high velocity sensitivity (rms variances of 0.1 m/s) in the planetary boundary layer (PBL). The aerosol backscatter is typically high in the PBL and the effects of the molecular backscatter can often be neglected. However, as was discussed in the original edge technique paper, the molecular contribution to the signal is significant above the boundary layer and a correction for the effects of molecular backscatter is required to make wind measurements. In addition, the molecular signal is a dominant source of noise in regions where the molecular to aerosol ratio is large since the energy monitor channel used in the single edge technique measures the sum of the aerosol and molecular signals. To extend the operation of the edge technique into the free troposphere we have developed a variation of the edge technique called the double edge technique. In this paper a ground based aerosol double edge lidar is described and the first measurements of wind profiles in the free troposphere obtained with this lidar will be presented.
Publication Date: Jul 01, 1998
Document ID:
19980236728
(Acquired Nov 28, 1998)
Subject Category: GEOPHYSICS
Document Type: Conference Paper
Publication Information: Nineteenth International Laser Radar Conference; Part 2; 587-590; (NASA/CP-1998-207671/PT2); (SEE 19980236718)
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD United States
Description: 4p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: WIND VELOCITY MEASUREMENT; OPTICAL RADAR; DOPPLER RADAR; REMOTE SENSING; RADAR MEASUREMENT; AEROSOLS; BACKSCATTERING; BANDPASS FILTERS; SPATIAL RESOLUTION; WIND PROFILES; PLANETARY BOUNDARY LAYER; TROPOSPHERE; RADAR DETECTION
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