کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1777851 1523671 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Climatology of short-period mesospheric gravity waves over Halley, Antarctica (76°S, 27°W)
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فیزیک زمین (ژئو فیزیک)
پیش نمایش صفحه اول مقاله
Climatology of short-period mesospheric gravity waves over Halley, Antarctica (76°S, 27°W)
چکیده انگلیسی

We present a first detailed climatological study of individual quasi-monochromatic mesospheric, short-period gravity-wave events observed over Antarctica. The measurements were made using an all-sky airglow imager located at Halley Station (76°S, 27°W) and encompass the 2000 and 2001 austral winter seasons. Distributions of wave parameters were found to be similar to findings at other latitudes. The wave headings exhibited unusually strong anisotropy with a dominant preference for motion towards the Antarctic continent and a rotation from westward during fall, to poleward in mid-winter, to eastward in spring. This rotation was accompanied by a systematic increase of ∼50% in the magnitudes of the horizontal wavelengths and observed phase speeds. It is postulated that the observed wave anisotropy was due to a succession of wave sources of different characteristics lying equatorward of Halley, or a dominant source mechanism evolving with time during the winter months.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Atmospheric and Solar-Terrestrial Physics - Volume 71, Issues 8–9, June 2009, Pages 991–1000
نویسندگان
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