Surname: Marsh
First Name: Dan
Status= other
Institution: HAO/NCAR
E-mail: marsh@ucar.edu
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Title: 
TIME-GCM simulations of the diurnal variation of lower thermospheric nitric 
oxide observed by HALOE
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Authors: 
Dan Marsh and Ray Roble
High Altitude Observatory,
National Center for Atmospheric Research

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Abstract: 
The UARS Halogen Occultation Experiment(HALOE) uses solar occultation to measure 
nitric oxide (NO) up to an altitude of 130 km. Significant differences exist 
between sunrise and sunset HALOE observations. TIME-GCM simulations show that 
these differences are consistent with perturbations induced by the diurnal tide. 
Clear tidal signatures are present that are the result of vertical motions in a 
background atmosphere that has a steep vertical gradient in NO. In addition, the 
observed seasonal and interannual NO variability appears to be linked to tidal 
variability.
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Discipline Category: Mesosphere