Stratosphere-mesosphere Coupling Through Vertically Propagating Gravity Waves During Mesospheric Temperature Inversion (MTI): An Evidence
Journal Title: International Journal of Current Research and Review - Year 2018, Vol 10, Issue 1
Abstract
Objective: It is theoretically observed that atmospheric gravity waves play a key role in vertical coupling during the Mesosphere Temperature Inversion (MTI). Therefore, the present paper describes the observational evidence for vertical coupling between the stratosphere and mesosphere through the short-period gravity waves (GWs), during the Mesosphere Temperature Inversion (MTI) over a tropical region, Gadanki (13.5oN, 79.2o E), India. Method: The combined observations of Mesosphere-Stratosphere-Troposphere (MST) Radar and Rayleigh LIDAR located at Gadanki is utilized to study the vertical coupling. We used a unique experimental design from the two ground-based instruments that scan the lower and middle atmosphere simultaneously during the observational campaign. This kind of combined instruments are very sparsely located on the same site to make the observations unique to understand the vertical coupling processes of GWs. Result: The vertical flux of the horizontal momentum of GWs of periods in the range 20 min. to 2h is investigated in the mesosphere using the MST Radar winds. The emphasis is made on the variability of zonal and meridional momentum fluxes in the mesosphere and possible reasons for the variability of fluxes during MTI. It is observed that raise in momentum fluxes of ~7 m2/s2 in the eastward flux and ~10 m2 /s2 in southward flux at mesospheric altitudes during the MTI. Conclusion: The gravity wave (GW) analysis using the LIDAR temperature profiles indicate the connection between GW breaking at mesosphere altitudes and temperature inversion and thus the turbulence caused mesospheric echoes. The study suggests the prospect of coupling between stratosphere and mesosphere during the MTI.
Authors and Affiliations
Dr. Sunkara Eswaraiah
Keywords
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- EP ID EP529331
- DOI 10.7324/IJCRR.2018.1011
- Views 163
- Downloads 0
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