Comparative MF radar and Na lidar measurements of fluctuating winds in the mesopause region

Richard L. Collins, Denise Thorsen, Steven J Franke

Research output: Contribution to journalReview article

Abstract

Na lidar and MF radar observations of the mesopause region (≈ 80-105 km) were made over a 2-year period at Urbana, Illinois (40°N, 88°W). The Na lidar data yielded both temperature profiles and Na density profiles which are used to derive independent estimates of the rms horizontal winds. Estimates of the rms horizontal winds from concurrent radar and lidar measurements are obtained on 37 nights, totaling 263 hours. These three sets of rms wind estimates are processed in a common fashion. This analysis yields vertical profiles of the rms winds that do not grow exponentially with altitude, indicating that the gravity wave field is saturated throughout this altitude region. All three techniques reveal an annual maximum in the summer rms horizontal winds. However, the Na density estimates also have a semiannual variation with a second maximum in winter, which was not produced by the other techniques. Estimates of the rms winds derived from lidar Na density and Na temperature data are comparable in magnitude. The radar estimates are systematically larger than both sets of lidar estimates at higher altitudes. The discrepancy between the radar and lidar estimates is found to be greatest at those altitudes where the saturation is most pronounced.

Original languageEnglish (US)
Pages (from-to)16583-16591
Number of pages9
JournalJournal of Geophysical Research Atmospheres
Volume102
Issue number14
StatePublished - Jul 27 1997

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mesopause
lidar
radar
Optical radar
optical radar
Radar
estimates
Gravity waves
wave field
gravity
temperature profile
temperature profiles
gravity wave
vertical profile
radar measurement
radar tracking
high altitude
gravity waves
profiles
night

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)
  • Palaeontology

Cite this

Comparative MF radar and Na lidar measurements of fluctuating winds in the mesopause region. / Collins, Richard L.; Thorsen, Denise; Franke, Steven J.

In: Journal of Geophysical Research Atmospheres, Vol. 102, No. 14, 27.07.1997, p. 16583-16591.

Research output: Contribution to journalReview article

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N2 - Na lidar and MF radar observations of the mesopause region (≈ 80-105 km) were made over a 2-year period at Urbana, Illinois (40°N, 88°W). The Na lidar data yielded both temperature profiles and Na density profiles which are used to derive independent estimates of the rms horizontal winds. Estimates of the rms horizontal winds from concurrent radar and lidar measurements are obtained on 37 nights, totaling 263 hours. These three sets of rms wind estimates are processed in a common fashion. This analysis yields vertical profiles of the rms winds that do not grow exponentially with altitude, indicating that the gravity wave field is saturated throughout this altitude region. All three techniques reveal an annual maximum in the summer rms horizontal winds. However, the Na density estimates also have a semiannual variation with a second maximum in winter, which was not produced by the other techniques. Estimates of the rms winds derived from lidar Na density and Na temperature data are comparable in magnitude. The radar estimates are systematically larger than both sets of lidar estimates at higher altitudes. The discrepancy between the radar and lidar estimates is found to be greatest at those altitudes where the saturation is most pronounced.

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