Large-scale Dynamics of Noctilucent Clouds Over Alaska, 2005

Details Large-scale Dynamics of Noctilucent Clouds Over Alaska, 2005 Large-scale Dynamics of Noctilucent Clouds Over Alaska, 2005

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa21a0265n&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA21A-0265

Physics

3332 Mesospheric Dynamics, 3360 Remote Sensing, 3384 Acoustic-Gravity Waves, 3389 Tides And Planetary Waves, 3399 General Or Miscellaneous

Scientific paper

Noctilucent clouds (NLC) form in the coldest region that exist on Earth, near the polar summer mesopause at an altitude of approximately 83 km. Coincident ground-based observations of NLC were made from interior Alaska over a 3-day period in August, 2005, using imagers and lidar. The imagers were deployed at Donnelly Dome (63° N, 145° W) approximately 175 km south of the lidar facility. The observed NLC displays were unusually extensive considering the late season, filling the twilight sky from horizon-to-horizon and lasting >4 hours. In particular, the night of August 10 showed a remarkable display extending well south of the observation site (> 125° elevation). Recent modeling results (Berger and von Zahn, 2007) showed how meridional winds can transport the icy particles southward from their nucleation site. Co-located MF radar data support this suggestion. We compare these data with simulations by the NRL Navy Operational Global Atmospheric Prediction System- Advanced Level Physics and High Altitude (NOGAPS-ALPHA) as well as with published work by Berger and von Zahn, 2007.

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