This paper examines the capability of three regional climate models (RCMs), i.e., RegCM3 (the International Centre for Theoretical Physics Regional Climate Model), PRECIS (Providing Regional Climates for Impacts Studi...This paper examines the capability of three regional climate models (RCMs), i.e., RegCM3 (the International Centre for Theoretical Physics Regional Climate Model), PRECIS (Providing Regional Climates for Impacts Studies) and CMM5 (the fifth-generation Pennsylvania State University-the National Center for Atmospheric Research of USA, NCAR Mesoscale Model) to simulate the near-surface-layer winds (10 m above surface) all over China in the late 20th century. Results suggest that like global climate models (GCMs), these RCMs have the certain capability of imitating the distribution of mean wind speed and fail to simulate the greatly weakening wind trends for the past 50 years in the country. However, RCMs especially RegCM3 have the better capability than that of GCMs to simulate the distribution and change feature of mean wind speed. In view of their merits, these RCMs were used to project the variability of near-surface-layer winds over China for the 21st century. The results show that 1) summer mean wind speed for 2020-2029 will be lower compared to those in 1990-1999 in most area of China; 2) annual and winter mean wind speed for 2081-2100 will be lower than those of 1971-1990 in the whole China; and 3) the changes of summer mean wind speed for 2081-2100 are uncertain. As a result, although climate models are absolutely necessary for projecting climate change to come, there are great uncertainties in projections, especially for wind speed, and these issues need to be further explored.展开更多
In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size...In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size).The data from measurements show that in the upper atmosphere the existence of an upper jet is important to the transition cyclone.When Mindulle moved to the area of the upper jet entrance,where high-altitude divergence existed, the pumping of the high-altitude divergence would enhance the vertical motion and low-level cyclone convergence. The enhanced vertical motion was confirmed by the simulation results and indicated that the existence of upper divergence enhanced the vertical motion which was favorable for the maintenance of Typhoon Mindulle.The process of extratropical transition (ET) and re-intensification always accompanies the process of cold air invasion. This process enhances the baroclinicity of the atmosphere and the formation of front at high altitudes, which converts baroclinic potential energy into kinetic energy and strengthens the cyclone vortex.The distributions of equivalent potential temperature (θe) and temperature anomalies show that the warm-core of the typhoon at the tropopause aids the re-intensification of the system. As the typhoon reenters the ocean, latent heat flux (LHF) increases in the north and west and the strong reflectivity and vertical motion occur in the east and southeast,and the west.With the re-intensification of the typhoon the wind field evolves from an oval to a circle at the lower atmosphere, the area coverage by high winds increases, and the distribution of the tangential wind shows an asymmetric pattern.展开更多
This paper tests the impacts of cloud-induced mass forcing on the moist potential vorticity (MPV) anomaly associated with torrential rains caused by Typhoon No.9914 (Dan) by using fine model simulation data output...This paper tests the impacts of cloud-induced mass forcing on the moist potential vorticity (MPV) anomaly associated with torrential rains caused by Typhoon No.9914 (Dan) by using fine model simulation data outputted by the Fifth-Generation NCAR / Penn State Mesoscale Model (MMS). The diagnostic results show that the positive MPV anomaly region, which is obtained by integrating the MPV from 600 hPa to 300 hPa in the vertical, roughly coincides with the precipitation at their synchronous stages either in position or in the distribution pattem, and the maximum positive MPV area of Dan is located mainly between 600 hPa and 300 hPa, which is much higher than torrential rain cases. Further analyses also showed that the value of positive MPV anomaly increased or decreased with the development of Dan, and the positive MPV anomaly may also be served as a tracer to indicate the evolution of tropical cyclone intensity.展开更多
The purpose of this paper is to present and analyze the methodological guidelines that directed the design, production, and use of the video program 衹要功夫深,铁棒磨成针 or How to Use the Chinese Dictionary: Beginn...The purpose of this paper is to present and analyze the methodological guidelines that directed the design, production, and use of the video program 衹要功夫深,铁棒磨成针 or How to Use the Chinese Dictionary: Beginners' Level, as well as expose the development phases of the program and its use by teachers in the classrooms of Chinese as a foreign language. This program is part of a series of videos about the use of dictionaries in different languages, which have been designed, produced, used, and assessed in the framework of the project "Diseno y produccion de material didctico en video para la ensefianza de lenguas en la UNAM" (Design and Production of Didactic Materials on Video for the Teaching of Languages at UNAM), just as presented at the II Congreso Internacional de Lexicografia Hispanica (II International Congress of Hispanic Lexicography) (2006). The topic Of this paper is the use of Chinese-Spanish bilingual dictionary. The method used was descriptive and systematic analysis methodological guidelines for creation derived from the design model proposed.展开更多
Objective By comparing the focus of acupuncture standards, management modes of acupuncture in certain areas are summarized to provide a reference for institutions and regions when formulating suitable standards for lo...Objective By comparing the focus of acupuncture standards, management modes of acupuncture in certain areas are summarized to provide a reference for institutions and regions when formulating suitable standards for local acupuncture services. Methods Japan, South Korea, the USA and Australia were selected as the representative countries. The standards language were limited to English, Japanese and South Korean. The websites of the national standards bodies and the official websites for the acupuncture association/ institute of these four countries were searched systematically. The laws of acupuncture were included in the study. Results Technical standards made up the most of the standard system for acupuncture in Japan, basic standards accounted for the most of the system in South Korea, while management standards accounted for the largest proportion of acupuncture standard systems in the USA and Australia. Conclusion Japan and South Korea, which use acupuncture mainly due to cultural and historical influences, place emphasis on establishing technical and basic standards. The USA and Australia, which use acupuncture as a complementary therapy, place emphasis on establishing management standards of acupuncture.展开更多
We investigate three kinds of strong laws of large numbers for capacities with a new notion of independently and identically distributed(IID) random variables for sub-linear expectations initiated by Peng.It turns out...We investigate three kinds of strong laws of large numbers for capacities with a new notion of independently and identically distributed(IID) random variables for sub-linear expectations initiated by Peng.It turns out that these theorems are natural and fairly neat extensions of the classical Kolmogorov's strong law of large numbers to the case where probability measures are no longer additive. An important feature of these strong laws of large numbers is to provide a frequentist perspective on capacities.展开更多
Annual political gatherings usher in a new era of development The First Session of the 13th National People’s Congress(NPC),China’s top legislature,came to a close in Beijing on March 20.Over the two weeks of its ...Annual political gatherings usher in a new era of development The First Session of the 13th National People’s Congress(NPC),China’s top legislature,came to a close in Beijing on March 20.Over the two weeks of its duration.展开更多
基金Under the jointly auspices of the Special Public Research for Meteorological Industry (No. GYHY200806009)Wind Energy Resources Detailed Survey and Assessment WorkEU-China Energy and Environment Program (No. Europe Aid/ 123310/D/Ser/CN)
文摘This paper examines the capability of three regional climate models (RCMs), i.e., RegCM3 (the International Centre for Theoretical Physics Regional Climate Model), PRECIS (Providing Regional Climates for Impacts Studies) and CMM5 (the fifth-generation Pennsylvania State University-the National Center for Atmospheric Research of USA, NCAR Mesoscale Model) to simulate the near-surface-layer winds (10 m above surface) all over China in the late 20th century. Results suggest that like global climate models (GCMs), these RCMs have the certain capability of imitating the distribution of mean wind speed and fail to simulate the greatly weakening wind trends for the past 50 years in the country. However, RCMs especially RegCM3 have the better capability than that of GCMs to simulate the distribution and change feature of mean wind speed. In view of their merits, these RCMs were used to project the variability of near-surface-layer winds over China for the 21st century. The results show that 1) summer mean wind speed for 2020-2029 will be lower compared to those in 1990-1999 in most area of China; 2) annual and winter mean wind speed for 2081-2100 will be lower than those of 1971-1990 in the whole China; and 3) the changes of summer mean wind speed for 2081-2100 are uncertain. As a result, although climate models are absolutely necessary for projecting climate change to come, there are great uncertainties in projections, especially for wind speed, and these issues need to be further explored.
基金supported by the National Natural Science Foundation of China(Nos.40876004,40890155 and 40675060)National 973 Project(Nos.2009CB-421500 and 2007CB411801)
文摘In this study,the fifth-generation Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) Mesoscale Model (MM5) is used to simulate Typhoon Mindulle (2004) at high resolution (3-km grid size).The data from measurements show that in the upper atmosphere the existence of an upper jet is important to the transition cyclone.When Mindulle moved to the area of the upper jet entrance,where high-altitude divergence existed, the pumping of the high-altitude divergence would enhance the vertical motion and low-level cyclone convergence. The enhanced vertical motion was confirmed by the simulation results and indicated that the existence of upper divergence enhanced the vertical motion which was favorable for the maintenance of Typhoon Mindulle.The process of extratropical transition (ET) and re-intensification always accompanies the process of cold air invasion. This process enhances the baroclinicity of the atmosphere and the formation of front at high altitudes, which converts baroclinic potential energy into kinetic energy and strengthens the cyclone vortex.The distributions of equivalent potential temperature (θe) and temperature anomalies show that the warm-core of the typhoon at the tropopause aids the re-intensification of the system. As the typhoon reenters the ocean, latent heat flux (LHF) increases in the north and west and the strong reflectivity and vertical motion occur in the east and southeast,and the west.With the re-intensification of the typhoon the wind field evolves from an oval to a circle at the lower atmosphere, the area coverage by high winds increases, and the distribution of the tangential wind shows an asymmetric pattern.
基金State Key Development Program for Basic Research of China (2009CB421505)National Natural Science Foundation of China (40505009)+1 种基金NMC-TIGGE Program (GYHY200706001)Project of State Key Laboratory of Severe Weather (2008LASW-A01)
文摘This paper tests the impacts of cloud-induced mass forcing on the moist potential vorticity (MPV) anomaly associated with torrential rains caused by Typhoon No.9914 (Dan) by using fine model simulation data outputted by the Fifth-Generation NCAR / Penn State Mesoscale Model (MMS). The diagnostic results show that the positive MPV anomaly region, which is obtained by integrating the MPV from 600 hPa to 300 hPa in the vertical, roughly coincides with the precipitation at their synchronous stages either in position or in the distribution pattem, and the maximum positive MPV area of Dan is located mainly between 600 hPa and 300 hPa, which is much higher than torrential rain cases. Further analyses also showed that the value of positive MPV anomaly increased or decreased with the development of Dan, and the positive MPV anomaly may also be served as a tracer to indicate the evolution of tropical cyclone intensity.
文摘The purpose of this paper is to present and analyze the methodological guidelines that directed the design, production, and use of the video program 衹要功夫深,铁棒磨成针 or How to Use the Chinese Dictionary: Beginners' Level, as well as expose the development phases of the program and its use by teachers in the classrooms of Chinese as a foreign language. This program is part of a series of videos about the use of dictionaries in different languages, which have been designed, produced, used, and assessed in the framework of the project "Diseno y produccion de material didctico en video para la ensefianza de lenguas en la UNAM" (Design and Production of Didactic Materials on Video for the Teaching of Languages at UNAM), just as presented at the II Congreso Internacional de Lexicografia Hispanica (II International Congress of Hispanic Lexicography) (2006). The topic Of this paper is the use of Chinese-Spanish bilingual dictionary. The method used was descriptive and systematic analysis methodological guidelines for creation derived from the design model proposed.
基金Supported by the Standardization of Traditional Chinese Medicine of State Administration of Traditional Chinese Medicine of the People’s Republic of China:2013099
文摘Objective By comparing the focus of acupuncture standards, management modes of acupuncture in certain areas are summarized to provide a reference for institutions and regions when formulating suitable standards for local acupuncture services. Methods Japan, South Korea, the USA and Australia were selected as the representative countries. The standards language were limited to English, Japanese and South Korean. The websites of the national standards bodies and the official websites for the acupuncture association/ institute of these four countries were searched systematically. The laws of acupuncture were included in the study. Results Technical standards made up the most of the standard system for acupuncture in Japan, basic standards accounted for the most of the system in South Korea, while management standards accounted for the largest proportion of acupuncture standard systems in the USA and Australia. Conclusion Japan and South Korea, which use acupuncture mainly due to cultural and historical influences, place emphasis on establishing technical and basic standards. The USA and Australia, which use acupuncture as a complementary therapy, place emphasis on establishing management standards of acupuncture.
基金supported by National Natural Science Foundation of China(Grant No.11231005)
文摘We investigate three kinds of strong laws of large numbers for capacities with a new notion of independently and identically distributed(IID) random variables for sub-linear expectations initiated by Peng.It turns out that these theorems are natural and fairly neat extensions of the classical Kolmogorov's strong law of large numbers to the case where probability measures are no longer additive. An important feature of these strong laws of large numbers is to provide a frequentist perspective on capacities.
文摘Annual political gatherings usher in a new era of development The First Session of the 13th National People’s Congress(NPC),China’s top legislature,came to a close in Beijing on March 20.Over the two weeks of its duration.