Simultaneous Observation of Gravity Waves in Temperature by Using Rayleigh LIDAR and Sodium LIDAR

Details Simultaneous Observation of Gravity Waves in Temperature by Using Rayleigh LIDAR and Sodium LIDAR Simultaneous Observation of Gravity Waves in Temperature by Using Rayleigh LIDAR and Sodium LIDAR

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa41a0285l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA41A-0285

Other

3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

One night(Oct 28,2003)temperature measurements by a resonance Sodium Wind/Temperature lidar at Maui (20.7oN,156.3oW,84-104km) and by a Rayleigh temperature Lidar at Mauna Loa (19.5oN, 155.6oW, 35 - 80 km) are used to study gravity waves (GWs) from the lower stratosphere up to the lower thermosphere. The overlapped time series of these two datasets starts from 5:28UT and ends at 15:13UT. Mean and fluctuations of temperatures are derived and one dominating vertical wavelength is found to be around 10 km for both lidar measurements.Three other wave components are identified from the Rayleigh lidar measurement, but not from the Sodium Lidar.Gravity waves with smaller vertical wavelength(around 5km)seem to be filtered out when they propagate upward to the mesosphere.The wave amplitudes generally increase with altitude except for some areas characterized by reduced convective instabilities.The observed waves are partly dissipated and their amplitudes increase with a scale height of 14km.The maximum amplitudes increase from 0.6%(1.5K) at the lower layer(35-52km) to 4.7%(9K) at the upper layer(84-103km),which suggests that the observed quasi-10-km GWs can propagate upward even after experiencing certain dissipation in the middle layer(52-58 km).The wave period is around 5.5 hours,and the same period wave is also identified in the OH airglow observed at Maui on the same night.

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