In this report we summarize the research results by Chinese scientists in 2012–2014. The focuses are placed on the researches of the middle and upper atmosphere, specifically the researches related to ground-based ob...In this report we summarize the research results by Chinese scientists in 2012–2014. The focuses are placed on the researches of the middle and upper atmosphere, specifically the researches related to ground-based observation capability development, dynamical processes, the property of circulation and chemistry-climate coupling of the middle atmospheric layers.展开更多
In this report the research results by Chinese scientists in 2014—2016 are summarized.The focuses are placed on the researches of the middle and upper atmosphere,specifically the researches associated with ground-bas...In this report the research results by Chinese scientists in 2014—2016 are summarized.The focuses are placed on the researches of the middle and upper atmosphere,specifically the researches associated with ground-based observation capabihty development,dynamical processes,and properties of circulation and chemistry-climate coupling of the middle atmospheric layers.展开更多
Temperature profiles provided by the Constellation Observing System for Meteorology,Ionosphere and Climate(COSMIC)global positioning system(GPS)satellite constellation were used to study an eight-year series(2007 to 2...Temperature profiles provided by the Constellation Observing System for Meteorology,Ionosphere and Climate(COSMIC)global positioning system(GPS)satellite constellation were used to study an eight-year series(2007 to 2015)of gravity wave(GW)potential energy in the stratosphere(18-30 km)around the Tibetan Plateau(TP).We found that with increasing altitude,the GW potential energy(E_p)values in the stratosphere caused by convection decreases.The importance of GWs that are stimulated by topography is enhanced in this area.In the TP,which was considered to lack strong topographical GW activity,clear activity existed in the spring and winter of all studied years.Based on the latitudinal zone of the TP,the distribution of GW potential energy is highly consistent with the elevation of the local topography.The activities of topographical GWs are strongly filtered as they propagate upward to the area of zero speed wind.The analysis indicates that in the TP,clear orographic GW excitation exists and propagates upward to the upper stratosphere,where it is greatly influenced by the wind.展开更多
In this article, the energy balance method is used to retrieve thermospheric mass density from CHAMP satellite precise orbit determination(POD) data during 2007–2009. The retrieved thermospheric mass densities are co...In this article, the energy balance method is used to retrieve thermospheric mass density from CHAMP satellite precise orbit determination(POD) data during 2007–2009. The retrieved thermospheric mass densities are compared with those from accelerometer data and an empirical model. The main conclusions are as follows:(1) Thermospheric mass density can be retrieved from POD data by the energy balance and semi-major axis decay methods, whose results are consistent.(2) The accuracy of the retrieved densities depends on the integration time period, and the optimal period for CHAMP density retrieval from POD data is about 20 minutes.(3) The energy balance method can be used to calibrate accelerometer data.(4) The accuracy of retrieving thermospheric density from POD data varies with satellite altitude and local time.展开更多
文摘In this report we summarize the research results by Chinese scientists in 2012–2014. The focuses are placed on the researches of the middle and upper atmosphere, specifically the researches related to ground-based observation capability development, dynamical processes, the property of circulation and chemistry-climate coupling of the middle atmospheric layers.
文摘In this report the research results by Chinese scientists in 2014—2016 are summarized.The focuses are placed on the researches of the middle and upper atmosphere,specifically the researches associated with ground-based observation capabihty development,dynamical processes,and properties of circulation and chemistry-climate coupling of the middle atmospheric layers.
基金supported by the National Natural Science Foundation of China (Grant Nos.41322029,41474129 & 41421063)the Project of Chinese Academy of Sciences(Grant Nos.KJCX2-EW-J01 & KZZD-EW-0101)+1 种基金Youth Innovation Promotion Association of the Chinese Academy of Sciences(Grant No.2011324)the Fundamental Research Funds for the Central Universities
文摘Temperature profiles provided by the Constellation Observing System for Meteorology,Ionosphere and Climate(COSMIC)global positioning system(GPS)satellite constellation were used to study an eight-year series(2007 to 2015)of gravity wave(GW)potential energy in the stratosphere(18-30 km)around the Tibetan Plateau(TP).We found that with increasing altitude,the GW potential energy(E_p)values in the stratosphere caused by convection decreases.The importance of GWs that are stimulated by topography is enhanced in this area.In the TP,which was considered to lack strong topographical GW activity,clear activity existed in the spring and winter of all studied years.Based on the latitudinal zone of the TP,the distribution of GW potential energy is highly consistent with the elevation of the local topography.The activities of topographical GWs are strongly filtered as they propagate upward to the area of zero speed wind.The analysis indicates that in the TP,clear orographic GW excitation exists and propagates upward to the upper stratosphere,where it is greatly influenced by the wind.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41325017 & 41274158)
文摘In this article, the energy balance method is used to retrieve thermospheric mass density from CHAMP satellite precise orbit determination(POD) data during 2007–2009. The retrieved thermospheric mass densities are compared with those from accelerometer data and an empirical model. The main conclusions are as follows:(1) Thermospheric mass density can be retrieved from POD data by the energy balance and semi-major axis decay methods, whose results are consistent.(2) The accuracy of the retrieved densities depends on the integration time period, and the optimal period for CHAMP density retrieval from POD data is about 20 minutes.(3) The energy balance method can be used to calibrate accelerometer data.(4) The accuracy of retrieving thermospheric density from POD data varies with satellite altitude and local time.
基金support from the National Natural Science Foundation of China(Grants Nos.41225017,41127901,41025016,and 41121003)the Chinese Academy of Sciences Key Research Program(Grant No.KZZD-EW-01)+1 种基金the National Basic Research Program of China(Grant No.2012CB825605)the Fundamental Research Funds for the Central Universities