Global distribution of the migrating terdiurnal tide seen in sporadic E occurrence frequencies obtained from GPS radio occultations

被引:37
作者
Fytterer, Tilo [1 ]
Arras, Christina [2 ]
Hoffmann, Peter [3 ]
Jacobi, Christoph [4 ]
机构
[1] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, D-76344 Eggenstein Leopoldshafen, Germany
[2] German Res Ctr Geosci GFZ, Dept Geodesy & Remote Sensing, D-14473 Potsdam, Germany
[3] Potsdam Inst Climate Impact Res, D-14412 Potsdam, Germany
[4] Univ Leipzig, Inst Meteorol, D-04103 Leipzig, Germany
来源
EARTH PLANETS AND SPACE | 2014年 / 66卷
关键词
Sporadic E layer; Terdiurnal tide; Wind shear theory; GPS radio occultation; LOWER THERMOSPHERE; E LAYER; MESOSPHERE; WAVES;
D O I
10.1186/1880-5981-66-79
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Global Positioning System radio occultation measurements by FORMOsa SATellite mission-3/Constellation Observing System for Meteorology, Ionosphere and Climate satellites were used to analyse the characteristics of the 8-h oscillation in sporadic E (E-S) layers. Six-year averages based on the 3-monthly mean zonal means from December 2006 to November 2012 were constructed for the amplitude of the terdiurnal oscillation in the occurrence frequency of E-S. A global distribution from 60 degrees S to 60 degrees N is given, revealing two peaks above 100 km during solstice with one maximum at low and midlatitudes (approximately 10 degrees to 40 degrees) in each hemisphere. During equinox, the global distribution is marked by two dominant peaks centred at midlatitudes, while an additional weak maximum is located at very low southern latitudes. The seasonal characteristics around 110 km reveal large values during equinox at low and midlatitudes (<40 degrees N), while further peaks occur in April at >40 degrees S and in July near 30 degrees S. The pattern around 90 km is dominated by a broad peak between 20 degrees and 30 degrees S from March to September. Comparisons with the terdiurnal oscillation in the neutral atmosphere derived from zonal wind and vertical zonal wind shear simulated with a circulation model of the middle atmosphere, as well as with satellite observations of the terdiurnal tide in temperature, fit quite well for the results above 100 km, but do not show agreement for lower altitudes.
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页数:9
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