Show simple item record

dc.contributor.authorWang, Weiyuan
dc.date.accessioned2015-12-01T02:45:49Z
dc.date.available2015-12-01T02:45:49Z
dc.date.issued2003-08
dc.identifier.urihttp://hdl.handle.net/11122/6239
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2003en_US
dc.description.abstractA Rayleigh lidar has been operated at Chatanika, Alaska (65°N, 147°W) since November 1997. The lidar observations yield temperature and density measurements in the stratosphere and mesosphere (40-80 km). This thesis presents a systematic engineering analysis of the retrieval methods used to determine both the temperature and density profiles as well as the density perturbations. Statistical and spectral analysis techniques are used to determine the total power in the density perturbations and estimate the power component due to geophysical variability and the power component due to instrumental noise. The power in the density perturbations is used to characterize the gravity-wave activity at this high-latitude site. Seventy-four nights of observation yielded 60 observation periods of data of sufficient quality to estimate the rms amplitude of the relative density perturbation in the 40-50 km altitude region at 30 min resolution. For these observations the average rms amplitude has a value of 0.43%. Preliminary investigation of campaign measurements in the spring of 2003 indicates that higher values of rms wave amplitude are associated with the presence of mesospheric inversion layers.en_US
dc.language.isoen_USen_US
dc.titleSpectral estimation of signal and noise power in rayleigh lidar measurements of the middle atmosphereen_US
dc.typeThesisen_US
refterms.dateFOA2020-03-05T12:12:56Z


Files in this item

Thumbnail
Name:
Wang_W_2003.pdf
Size:
108.0Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record