09:00 - 10:20
Room: Conference room
Oral presentations
Mean vertical wind in the summer polar mesosphere: Are radar measurements reliable?
Nikoloz Gudadze, Gunter Stober, Fazlul Laskar, Jorge L. Chau
Leibniz-Institute of Atmospheric Physics at the Rostock University, Kühlungsborn, Germany

Vertical component of the neutrals wind is an important parameter in the dynamical processes of the mesopause region. The mean vertical motion plays a significant role in the global circulation of the mesosphere. Nevertheless observations and models indicate large discrepancies in magnitudes and direction of mean vertical flow. Here we present the observational results of the mean vertical wind during summer season in the polar region. Vertical components are derived from the continuous multi-beam radar observations of the radial velocities obtained using Polar Mesosphere Summer Echoes (PMSE) as tracer. We analyzed data from June and July 2016 observed by MAARSY, which is located in northern Norway. Besides the results from PMSE, we present and discuss climatology of recent horizontal divergence estimates obtained from combining closely located specular meteor radars. Our preliminary results show downward flow below the summer polar mesopause region. Height profiles of the mean vertical winds with high altitude resolution indicate a significant minimum value close to 81 km, while upward flow is observed at higher altitudes. Obtained results are contrary to recent model estimations. The Differences between model and observational results leave the open questions, which needs subsequent discussions.


Reference:
Observations 3-O-02
Session:
PMSE
Presenter/s:
Nikoloz Gudadze
Topic:
1) Mesospheric clouds and related sciences, including noctilucent clouds (NLCs), polar mesospheric clouds (PMCs), and polar mesospheric summer echoes (PMSEs).
Presentation type:
Oral communication 20 min
Room:
Conference room
Chair/s:
Markus Rapp
Date:
Wednesday, 20 September
Time:
09:20 - 09:40