Based on the method of composite analysis, the onset process and preceding signs of summer monsoon over the South China Sea (SCS) is investigated. The result indicates that convection activities appear first over the ...Based on the method of composite analysis, the onset process and preceding signs of summer monsoon over the South China Sea (SCS) is investigated. The result indicates that convection activities appear first over the Indo-China Peninsula prior to the onset of the monsoon, then around the Philippines just at the point of onset, implying that the convection activities around the Philippines serve as one of the reasons leading to the SCS monsoon onset. Before the SCS monsoon onset, the equatorial westerly over the Indian Ocean (75(E ～ 95(E ) experiences noticeable enhancement and plays an important role on the SCS monsoon onset. It propagates eastward rapidly and causes the establishment and strengthening of equatorial westerly in the southern SCS, on the one hand, it results in the migration southward of the westerly on south side of the south-China stationary front by means of shift northeastward of the westerly and convection over the Bay of Bengal, on the other. Further study also shows that the intensification of equatorial westerly in the Indian Ocean (75(E ～ 95(E) and the southern SCS is closely related to the reinforcement of the Southern-Hemisphere Mascarene high and Australian high, and cross-equatorial flow northward around Somali, at 85(E and 105(E, respectively.展开更多
Dynamic equations controlling the thermally-driven fluid convection in a single rock crack are established in the paper . The critical criteria for the onset of convection in such a configuration are found by linear d...Dynamic equations controlling the thermally-driven fluid convection in a single rock crack are established in the paper . The critical criteria for the onset of convection in such a configuration are found by linear dynamic analysis of the equations and the stability of the convection discussed by nonlinear analysis method . The research demonstrates that the critical Rayleigh number has a magnitude 103. While the Rayleigh number R of real ore-forming fluids exceeds this value , the convection happens , and as R becomes larger , the fluid convection pattern develops from nonequilibrium steady states to double-periodically produced limit cycles and eventually to chaos (turbulences ).The implication of these dynamic analyses for the ore-forming processes of late-magma tic hydrothermal deposits is also discussed in the paper .展开更多
Two numerical experiments were performed by using ECMWF limited area model in order to assess the impact of radiative processes on the onset of summer monsoon.The control experiment includes all model physics and the ...Two numerical experiments were performed by using ECMWF limited area model in order to assess the impact of radiative processes on the onset of summer monsoon.The control experiment includes all model physics and the other experiment is exclusive of radiative processes.The simulated results show that the radiative processes enhanced the monsoon circulation and the associated vertical circulation over South Asia.Especially over the Qinghai-Xizang Plateau,the build-up of the plateau monsoon depression and the beginning of the plat- eau rainy season are highly dependent upon the radiative processes. Through the radiation-cloud interaction,the “moist processes” were enhanced over land.More latent heat was released.The feedback of the physical processes caused the strengthening of the monsoon circulation over southern Asia.展开更多
目的:分析医院中药膏方(traditional Chinese medical extraction,TCME)的临床加工与使用情况及其典型案例。方法:从膏方的起源发展、膏方在中山地区使用的适用性,总结与分析医院中药膏方的临床使用情况。结果:随着中医"治未病&qu...目的:分析医院中药膏方(traditional Chinese medical extraction,TCME)的临床加工与使用情况及其典型案例。方法:从膏方的起源发展、膏方在中山地区使用的适用性,总结与分析医院中药膏方的临床使用情况。结果:随着中医"治未病"的发展,中药膏方成为民众广为接受的养生保健和慢性病调理的重要手段之一,充分发挥中医药治疗的特色优势,开展中药膏方服务取得了良好的效果。结论:中药膏方在养生保健和慢性病调理方面,发挥了"治未病"作用,深受民众青睐。展开更多
By using the NCEP/NCAR reanalysis data from 1958 to 1997, we first looked into the atmospheric flow conditions in the one month immediately prior to the onset of the South China Sea summer monsoon （SCSSM） each year....By using the NCEP/NCAR reanalysis data from 1958 to 1997, we first looked into the atmospheric flow conditions in the one month immediately prior to the onset of the South China Sea summer monsoon （SCSSM） each year. A monthly-averaged zonal basic flow of 40-yr composite was then calculated. The stability of Rossby wave in the basic flow was studied based on the spherical barotropic vorticity equation. Furthermore, the spectral function expansion method was adopted to define and compute the evolvement of a developing wave packet. The results indicate that there exists barotropic instability of spherical Rossby wave in the climatically-averaged flow field before the SCSSM onset. The instability is triggered by the westerly jet stream in the Southern Hemisphere, and the strongest instable perturbation lies to the south of the westerly jet stream. The peak of the developing spherical Rossby wave packet propagates from mid and high latitudes to low latitudes, though not crossing the equator, spurring the cumulus convection in the tropical zones. The eruption of the cumulus convection and its spread to monsoon regions help to speed up the adjustment of the general circulation and the SCSSM onset. It is concluded that elements that contribute to the SCSSM onset are on global scale, albeit the onset itself looks like a local phenomenon.展开更多
基金National Scaling Project A - South China Sea Monsoon Experiment Development Plan of Key National Fundamental Research - Study o
文摘Based on the method of composite analysis, the onset process and preceding signs of summer monsoon over the South China Sea (SCS) is investigated. The result indicates that convection activities appear first over the Indo-China Peninsula prior to the onset of the monsoon, then around the Philippines just at the point of onset, implying that the convection activities around the Philippines serve as one of the reasons leading to the SCS monsoon onset. Before the SCS monsoon onset, the equatorial westerly over the Indian Ocean (75(E ～ 95(E ) experiences noticeable enhancement and plays an important role on the SCS monsoon onset. It propagates eastward rapidly and causes the establishment and strengthening of equatorial westerly in the southern SCS, on the one hand, it results in the migration southward of the westerly on south side of the south-China stationary front by means of shift northeastward of the westerly and convection over the Bay of Bengal, on the other. Further study also shows that the intensification of equatorial westerly in the Indian Ocean (75(E ～ 95(E) and the southern SCS is closely related to the reinforcement of the Southern-Hemisphere Mascarene high and Australian high, and cross-equatorial flow northward around Somali, at 85(E and 105(E, respectively.
文摘Dynamic equations controlling the thermally-driven fluid convection in a single rock crack are established in the paper . The critical criteria for the onset of convection in such a configuration are found by linear dynamic analysis of the equations and the stability of the convection discussed by nonlinear analysis method . The research demonstrates that the critical Rayleigh number has a magnitude 103. While the Rayleigh number R of real ore-forming fluids exceeds this value , the convection happens , and as R becomes larger , the fluid convection pattern develops from nonequilibrium steady states to double-periodically produced limit cycles and eventually to chaos (turbulences ).The implication of these dynamic analyses for the ore-forming processes of late-magma tic hydrothermal deposits is also discussed in the paper .
文摘Two numerical experiments were performed by using ECMWF limited area model in order to assess the impact of radiative processes on the onset of summer monsoon.The control experiment includes all model physics and the other experiment is exclusive of radiative processes.The simulated results show that the radiative processes enhanced the monsoon circulation and the associated vertical circulation over South Asia.Especially over the Qinghai-Xizang Plateau,the build-up of the plateau monsoon depression and the beginning of the plat- eau rainy season are highly dependent upon the radiative processes. Through the radiation-cloud interaction,the “moist processes” were enhanced over land.More latent heat was released.The feedback of the physical processes caused the strengthening of the monsoon circulation over southern Asia.
文摘目的:分析医院中药膏方(traditional Chinese medical extraction,TCME)的临床加工与使用情况及其典型案例。方法:从膏方的起源发展、膏方在中山地区使用的适用性,总结与分析医院中药膏方的临床使用情况。结果:随着中医"治未病"的发展,中药膏方成为民众广为接受的养生保健和慢性病调理的重要手段之一,充分发挥中医药治疗的特色优势,开展中药膏方服务取得了良好的效果。结论:中药膏方在养生保健和慢性病调理方面,发挥了"治未病"作用,深受民众青睐。
基金Supported by the National Key Programme for Developing Basic Sciences (2007CB411800).
文摘By using the NCEP/NCAR reanalysis data from 1958 to 1997, we first looked into the atmospheric flow conditions in the one month immediately prior to the onset of the South China Sea summer monsoon （SCSSM） each year. A monthly-averaged zonal basic flow of 40-yr composite was then calculated. The stability of Rossby wave in the basic flow was studied based on the spherical barotropic vorticity equation. Furthermore, the spectral function expansion method was adopted to define and compute the evolvement of a developing wave packet. The results indicate that there exists barotropic instability of spherical Rossby wave in the climatically-averaged flow field before the SCSSM onset. The instability is triggered by the westerly jet stream in the Southern Hemisphere, and the strongest instable perturbation lies to the south of the westerly jet stream. The peak of the developing spherical Rossby wave packet propagates from mid and high latitudes to low latitudes, though not crossing the equator, spurring the cumulus convection in the tropical zones. The eruption of the cumulus convection and its spread to monsoon regions help to speed up the adjustment of the general circulation and the SCSSM onset. It is concluded that elements that contribute to the SCSSM onset are on global scale, albeit the onset itself looks like a local phenomenon.
