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《Chinese Journal of Geophysics》 2007-03
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Seasonal variations of the MLT tides in 120°E meridian

CHEN Ze-Yu, L Da-Ren Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China  
The authors report in the article the seasonal variations of major atmospheric tides in the mesosphere and lower thermosphere region in the meridian at 120°E. One-year long SABER/TIMED temperature measurements covering Nov. 2004 to Jan. 2006 were used to extract the tidal components with Fourier-Least squares fit and FFT analysis, and to reconstruct the diurnal, semidiurnal and terdiurnal tides in the meridian. The migrating diurnal tides increase with altitude and attain maxima at 97 km height, then decrease sharply with altitude. The tides of other frequency increase with altitude and attain significant amplitude at 97 km height. Considering the behavior of vertical variation, the authors place their focus on introducing estimation results obtained at the 97 km altitude. For the tides of each frequency, the migrating and nonmigrating components were examined separately to identify their respective contribution to the whole of the tides. The primary results showed that migrating component plays dominant role in charactering the general temporal and spatial distribution for both diurnal and semidiurnal tides. Regarding the diurnal tides, contribution of migrating component is the most dominant one during spring equinox, which is characterized by the amplitude maxima at the equator and that at the tropics for both hemispheres. Moreover, the temporal variation of the diurnal tides at the tropical latitude in Northern hemisphere is consistent to the analysis result obtained by using meteor radar wind measurements taken in Wuhan (30°N, 114°E). Contributions of nonmigrating tides are more significant in other seasons. During summer solstitial time in 2005, tidal modes (1, 0), (1, -3) and (1, -2) contribute together to form a diurnal tides active area from 20°N to 40°S with the maximal amplitude 20 K at the equator. Due to the domination of migrating component, semidiurnal tides occur at the tropical latitudes in both hemispheres. In northern hemisphere, the active tides area centers at autumn equinox with maximum 13 K. And in southern hemisphere, the active area centers at the time in between spring and summer equinox. The influences of nonmigrating semidiurnal components are also clear during other seasons as several other centers with maximal amplitude are seen. Confined in the latitude range 40°S~40°N, terdiurnal components exhibit much weaker activity with much smaller amplitudes than that of the diurnal and semidiurnal components. Current estimation results suggest that nonmigrating terdiurnal components have amplitudes that are as large as and during most times larger than that of migrating component, thus predominate the global distribution of terdiurnal tides in 2005.
【Fund】: 国家自然科学基金重点项目(40333034);; 中国科学院重要方向项目(KZCX2-YW-123 KGCX3-SYW-403-09);; 和武汉大学地球空间与大地测量教育部重点实验室项目(L036-02)资助
【CateGory Index】: P433
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1 WU Zhen~ 1, 2 , CHEN Ze-Yu~ 1 , PENG Yong-Gang~3, CHEN Hong-Bin~1, WANG Zhen-Hui~2, L Da-Ren~11 Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China2 Institute of Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, China3 Office of Administration Management of China Meteorologial Administration, Beijing 100081, China;Re-examination of MLT mean zonal winds over East Asia by using WINDII/UARS dataset[J];Chinese Journal of Geophysics;2008-01
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