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Highlights. Science. reference. Climatology of stratospheric gravity-wave potential energy in Antarctica and the duality of gravity waves on MLT. Science. South Pole. Rothera South Pole. Rothera.

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Science

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  1. Highlights Science reference Climatology of stratospheric gravity-wave potential energy in Antarctica and the duality of gravity waves on MLT Science South Pole Rothera South Pole Rothera • Derived from Fe Boltzmann lidar data, gravity wave potential energy density in 30-45 km range at Rothera (67.5S, 68.0W) is 4 times higher than the South Pole in winter but is comparable in summer. Clear seasonal variations are observed at Rothera with the winter average being 6 times larger than that of summer. The differences are likely due to different seasonal variations in wave sources and critical level filtering. • Statistically polar mesospheric cloud (PMC) brightness is negatively correlated with the stratospheric gravity-wave strength at Rothera while no significant correlation at the South Pole. Such results illustrate the duality of gravity waves that drive the general circulation to cool mesopause in summer but destroy PMCs locally. Yamashita, C., X. Chu, H.-L. Liu, P. J. Espy, G. J. Nott, and W. Huang, “Stratospheric gravity wave characteristics and seasonal variations observed by lidar at the South Pole and Rothera, Antarctica”, Journal of Geophysical Research, 114, D12101, doi:10.1029/2008JD011472, 2009. Chu, X., C. Yamashita, P. J. Espy, G. J. Nott, E. J. Jensen, H.-L. Liu, W. Huang, and J. P. Thayer, “Responses of polar mesospheric cloud brightness to stratospheric gravity waves at the South Pole and Rothera, Antarctica”, Journal of Atmospheric and Solar-Terrestrial Physics, 71, 434-445, 2009.

  2. Highlights Science reference Simultaneous temperature and wind measurements from 10-45 km using a 3-frequency lidar with Na-DEMOF Science • First field demonstration of simultaneous wind and temperature measurements with a Na double-edge magneto-optic filter (Na-DEMOF) implemented in the receiver of a three-frequency Na Doppler lidar. Reliable winds and temperatures were obtained in the altitude range of 10–45 km with 1 km resolution and 60 min integration under the conditions of 0.4 W lidar power and 75 cm telescope. • This edge filter with a multi-frequency lidar concept can be applied to other direct-detection Doppler lidars for profiling wind and temperature simultaneously from lower to upper atmosphere. Huang, W., X. Chu, B. P. Williams, S. D. Harrell, J. Wiig, and C.-Y. She, Na double-edge magneto-optic filter for Na lidar profiling of wind and temperature in the lower atmosphere, Optics Letters, 34(2), 199-201, January 15, 2009a. Huang, W., X. Chu, J. Wiig, B. Tan, C. Yamashita, T. Yuan, J. Yue, S. D. Harrell, C.-Y. She, B. P. Williams, J. S. Friedman, and R. M. Hardesty, “First field demonstration of simultaneous wind and temperature measurements from 5 to 50 km with a Na double-edge magneto-optic filter in a multi-frequency Doppler lidar”, Optics Letters, 34(10), 1552-1554, May 15, 2009b.

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