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High Resolution Global Modeling of the atmospheric Circulation

Advances in atmospheric Sciences 2006年第6期23卷 842-856页

作者： Kevin HAMILTON International Pacific Research Center University of Hawaii at Manoa HonoluluHawaii 96822USA

An informal review is presented of recent developments in numerical simulation of the global atmospheric circulation with very fine numerical resolution models, The focus is on results obtained recently with versions of the GFDL SKYHI model and the atmospheric Model for the Earth Simulator （AFES） global atmospheric models. These models have been run with effective horizontal grid resolution of -10-40 km and fine vertical resolution. The results presented demonstrate the utility of such models for the study of a diverse range of phenomena, Specifically the models are shown to simulate the development of tropical cyclones with peak winds and minimum central pressures comparable to those of the most intense hurricanes actually observed, More fundamentally, the spectrum of energy content in the mesoscale in the flow can be reproduced by these models down to near the smallest explicitly-resolved horizontal scales, in the middle atmosphere it is shown that increasing horizontal resolution can lead to significantly improved overall simulation of the global-scale circulation, The application of the models to two specific problems requiring very fine resolution global will be discussed, The spatial and temporal variability of the vertical eddy flux of zonal momentum associated with gravity waves near the tropopause is evaluated in the very fine resolution AFES model, This is a subject of great importance for understanding and modelling the flow in the middle atmosphere, Then the simulation of the small scale variations of the semidiurnal surface pressure oscillation is analyzed, and the signature of significant topographic modulation of the semidiurnal atmospheric tide is identified.

关键词： general circulation model mesoscale simulation gravity waves atmospheric tides

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atmospheric Excitation of Polar Motion

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Geo-Spatial Information Science 2010年第2期13卷 130-136页

作者： CHEN Wei SHEN Wenbin DONG Xiaowei School of Geodesy and Geomatics Wuhan University 129 Luoyu Road Wuhan 430079 China State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing Wuhan University 129 Luoyu Road Wuban 430079 China Key Laboratory of Geospace Environment and Geodesy Ministry of Education Wuhan University 129 Luoyu Road Wuhan 430079China

The polar motion excited by the fluctuation of global atmospheric angular momentum (AAM) is investigated. Based on the global AAM data, numerical results demonstrate that the fluctuation of AAM can excite the seasonal wobbles (e.g., the 18-month wobble) and the Chandler wobble, which agree well with previous studies. In addition, by filtering the dominant low frequency components, some distinct polar wobbles corresponding to some great diurnal and semi-diurnal atmospheric tides are found.

关键词： polar motion atmospheric excitation 18-month wobble Chandler wobble atmospheric tides

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Planetary wave oscillations in sporadic E layer occurrence at Wuhan

Planetary wave oscillations in sporadic E layer occurrence a...

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中国科学院地质与地球物理研究所2008学术年会

作者： Xiaomin Zuo~(1,2,3,4) and Weixing Wan~1 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing,100029,China 2 Mathematics and Physics Department,China University of Geosciences,430074,China 3 Wuhan Institute of Physics and Mathematics,Chinese Academy of Sciences,China 4 Graduate School,Chinese Academy of Sciences,China

Quasi 6-day oscillations in E occurrence were observed to occur in relation with planetary wave activity at Wuhan,China(30.6°N,114.5°E).Wavelet analysis of E occurrence time series revealed that a strong 5- to 7-day oscillation was present during the period from about day 120 to 137 of *** same quasi 6-day planetary wave oscillation was also found to dominate the spectrum of concurrent wind data measured in the 80- to 100-km region by a meteor radar,in agreement with the E *** is also a great deal of similarity between the 5- to 7-day band-pass filtered waveforms of E occurrence and the wind *** estimating the wave phase changes with altitude,the quasi 6-day PW in the zonal wind was found to be in phase with the sporadic E layer critical frequency,fE,at about 115 km,close to the observed E *** quasi 6-day PW modulation was also present in the amplitude of the 12-h and 24-h periodicities which existed in the fE time *** present results provide new evidence in favor of a planetary wave indirect role on E formation through the modulation of tides,which in line with previous studies by Haldoupis and Pancheva(2002),and Pancheva et al.(2003).

关键词： Sporadic E layers planetary waves atmospheric tides PW modulation of tides

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