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EFFECTS OF SPRING SOIL MOISTURE IN THE INDOCHINA PENINSULA ON SUMMER PRECIPITATION OVER THE SOUTH CHINA SEA AND ITS SURROUNDING AREAS: A SIMULATION STUDY FOR 1999

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Journal of Tropical Meteorology 2019年第2期25卷 211-226页

作者： li jiang-nan YOU Jia-xing li Fang-zhou MAO jiang-yu School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen University China Three Gorges Projects Development Co. Ltd. State Key Laboratory of Numerical Simulation of Atmospheric Sciences and Earth Fluid Dynamics Institute of Atmospheric Physics Chinese Academy of Sciences

Using the regional climate model RegCM4.4.5, coupled with the land model CLM4.5, we investigated the effects of springtime soil moisture in the Indochina Peninsula on summer precipitation over the South China Sea and its surrounding areas in 1999. Results have indicated that there exists positive correlation between soil moisture and summer precipitation over the western Pacific Ocean and negative correlation between soil moisture and summer precipitation over the eastern Indian Ocean. Summer precipitation in the South China Sea and its surrounding areas responds to springtime soil moisture in the Indochina Peninsula(the northwest region is critical) because general atmospheric circulation is sensitive to the near-surface thermodynamic state. Increased(decreased) soil moisture would result in decreased(increased) local surface temperatures. Latitudinal, small-scale land-sea thermal differences would then result in northeasterly wind(southwesterly wind) anomalies in the upper layer and southwesterly wind(northeasterly wind) anomalies in the lower layer, which strengthen(weaken) monsoon development. As a result,precipitation would enter the Western Pacific region earlier(later), and water vapor over the eastern Indian Ocean would enter the South China Sea earlier(later), causing a precipitation reduction(increase) in the eastern Indian Ocean and increase(reduction) in the Western Pacific.

关键词： RegCM CLM soil moisture precipitation

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Impacts of Horizontal and Vertical Resolutions on the Microphysical Structure and Boundary Layer Fluxes of Typhoon Hato(2017)

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Journal of Tropical Meteorology 2021年第1期27卷 10-23页

作者： ZHAO Yang-jie li jiang-nan li Fang-zhou RUAN Zi-xi School of Atmospheric Sciences/Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies Sun Yat-sen UniversityGuangzhou 510275 China Dongguan Meteorological Service DongguanGuangdong 523000 China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiGuangdong 519082 China

We set four sets of simulation experiments to explore the impacts of horizontal resolution(HR)and vertical resolution(VR)on the microphysical structure and boundary layer fluxes of tropical cyclone(TC)Hato(2017).The study shows that higher HR tends to strengthen *** VR in the upper layers tends to weaken TC,while increasing VR in the lower layers tends to strengthen *** amounts of all hydrometeors were larger with higher *** VR at the upper level enhanced the mixing ratios of cloud ice and cloud snow,while increasing VR at the lower level elevated the mixing ratios of graupel and *** has greater impact on the distributions of *** HR has a more complete ring structure of the eyewall and more concentrated hydrometeors along the cloud *** VR at the lower level has little impact on the distribution of TC hydrometeors,while increasing VR at the upper level enhances the cloud thickness of the eyewall *** latent heat flux(SLHF)is influenced greatly by *** HR leads to larger water vapor fluxes and larger latent heat,which would result in a stronger TC.A large amount of false latent heat was generated when HR was too high,leading to an extremely strong TC,VR has a smaller impact on SLHF than *** increasing VR at the upper-level reduces the SLHF and weakens TC,and elevating VR at the lower-level increases the SLHF and strengthens *** changes in surface water vapor flux and SLHF were practically identical and the simulation results were improved when HR and VR were more *** friction velocity was greater with higher *** VR at the lower level increased the friction velocity,while increasing VR at the upper level reduced it.

关键词： tropical cyclone horizontal resolution vertical resolution WRF

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Implementation Effect of Farmland Protection in Urumqi-Changji Economic Zone,China

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Asian Agricultural Research 2010年第7期2卷 30-34,38页

作者： li jiang-nan Department of Economics and Management Changji CollegeChangji 831100China

A multi-level evaluation index system is established with farmland protection as the target layer,farmland quantity,farmland quality andfarmland sustainable development as the criterion *** the index layer includes the quantity change of farmland,per capita farmland area,multiple cropping index,total grain yield,unit grain yield,per capita grain security coefficient,and unit machinery dynamical *** expert eval-uation method and factor analysis method are used to determine the weight of *** to the data in farmland area,grain yield and eco-nomic development in Urumqi-Changji Economic Zone in the years 1996-2007,a comprehensive evaluation model of intensive farmland use inUrumqi-Changji Economic Zone is established after data *** overall implementation effect of farmland protection policy is ana-lyzed by integrating the farmland quantity,farmland quality and sustainable *** shows that implementation effect of farmland pro-tection shows an upward trend in general in Urumqi-Changji Economic Zone in the years 1996-2007,with a fluctuation in the years 2000-2003and a stable rising phase from 2004 till *** maximum value is 0.779 in the year 2007;the minimum value is 0.242 in the year 1996;and themean value in the years 1996-2007 is *** protection at first strictly controls the farmland quantity,then pays attention to farmlandquality,and finally focuses on the sustainable use of farmland.

关键词： Farmland protection Implementation effect Urumqi-Changji Economic Zone China

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Influence of Boundary Layer Mixing Mechanisms on the Simulation of Typhoon Wutip:A Direct Hit on the Xisha Islands in 2013

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Journal of Tropical Meteorology 2024年第3期30卷 211-222页

作者： GUO Tian-yun li jiang-nan PANG Si-min MA Xiao-ling School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster StudiesSun Yat-sen UniversityZhuhaiGuangdong 519082 China Hunan Meteorological Service Center Changsha 410118 China Guangxi Meteorological Disaster Prevention Center Nanning 530022 China Hunan Key Laboratory of Meteorological Disaster Prevention and Mitigation Changsha 410118 China

In this study,we simulated the tropical cyclone(TC)Wutip,which originated in the South China Sea in 2013,using three planetary boundary layer(PBL)parameterized schemes within the Weather Research and Forecasting model,i.e.,Medium-Range Forecast(MRF),Yonsei University scheme(YSU),and Asymmetric Convective Model Version 2(ACM2),with different vertical mixing *** investigated the effects of different PBL mixing mechanisms on the simulation of TC track,intensity,structure,and *** results reveal that the surface flux and vertical mixing of PBL jointly influenced the TC throughout its lifecycle,and the simulated TC intensity was closely correlated with the eyewall *** three schemes were all first-order and nonlocal closure ***,the MRF scheme was over-mixed,which led to a relatively dryer and warmer near-surface layer,a wetter and colder upper PBL,and thus a simulated eyewall with the smallest wet static energy and weaker ***,the MRF scheme produced the smallest 10-m wind speed,which was closest to the observation,and the weakest TC warm-core structure and *** YSU scheme was similar to the MRF scheme,yet it distinguished itself by incorporating an explicit treatment of the entrainment process at the top of the PBL and developing thermal-free convection above the PBL of the eyewall,which significantly increased the wet static energy over the TC ***,the simulated eyewall was more contracted and steeper with stronger upward motion while the eye area became even warmer,finally leading to the strongest *** precipitation distribution simulated by the YSU scheme was the most consistent with the *** ACM2 scheme used the nonlocal upward and local downward mixed asymmetric convection modes,which reduced the excessive de-velopment of thermal-free convection at the eyewall,and avoided restricting the dynamically forced turbulent motion outside the eyewall,leading to a larger radius of the

关键词： tropical cyclone PBL scheme mixing mechanism WRF

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Simulation of the evolution of the latent heat processes in a mesoscale convective system accompanied by heavy rainfall over the Guangzhou region of South China

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Atmospheric and Oceanic Science Letters 2017年第1期10卷 58-64页

作者： li jiang-nan WU Kai-Lu DING Cheng-Hui YANG Chao-Feng li Fang-Zhou WANG Dong-Hai FENG Ye-Rong School of Atmospheric Sciences Sun Yat-sen UniversityGuangzhouChina State Key Laboratory of Severe Weather(LaSW) Chinese Academy of Meteorological SciencesBeijingChina Guangdong/CMA Key Laboratory of Regional Numerical Weather Prediction GuangzhouChina

A cloud-scale WRF simulation was used to investigate the cloud microphysical processes and threedimensional structure of latent heat budgets in different stages of a mesoscale convective system（MCS） accompanied by heavy rain that occurred in the Guangzhou region of South *** results enable us to draw the following conclusions：（1） During the development and mature stages,the main heating processes were condensation below 400 hPa and deposition above 400 *** main cooling processes were evaporation and *** the dissipation stage,all the microphysical processes were weak.（2） Water vapor condensed into cloud water,and rainwater significantly contributed to all stages of the MCS.（3） During every stage of the MCS,the primary cooling microphysical process was the evaporation of rainwater,which was maximum during the mature stage.

关键词： Mesoscale convective system microphysical process latent heat budget

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Transplantation of human thioredoxin gene-modified hepatocytes for treatment of acute liver failure in rat model

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Chinese Medical Journal 2009年第21期122卷 2631-2635页

作者： li Hua jiang nan ZHANG Jian WANG Gen-shu YANG Yang CHEN Gui-hua liver Transplantation Center Third Affiliated Hospital of Sun Yat-sen University Guangzhou Guangdong 510630 China

Background Mostly because of the limited number and proliferative ability of the transplanted hepatocytes, hepatocyte transplantation offers only temporary support to the hepatic function with rather poor functional replacement of the damaged liver parenchyma. This study aimed to observe the therapeutic effect of human thioredoxin （hTrx） gene-modified hepatocytes on experimental acute liver failure in rats. Methods hTrx cDNA was obtained by reverse transcription-polymerase chain reaction （RT-PCR） from human osteosarcoma 143 （TK-） cells to construct the recombinant retrovirus vector pLEGFP/hTrx, which was packaged into PA317 cells to collect the recombinant retrovirus containing hTrx gene. After titration and characterization, the recombinant retrovirus was applied to primary cultured rat hepatocyte for infection to generate hTrx gene-modified rat hepatocytes, whose viability and antioxidative capacity were examined by immunohistochemistry and MTT assay, respectively. In a Sprague-Dawley （SD） rat model of acute liver failure, the modified hepatocytes were injected into the spleen, and the hepatic function and survival rate of the recipient rats were evaluated at different time points after the transplantation. Results NIH3T3 cells infected by the recombinant retrovirus were capable of expressing bioactive hTrx in the form of fusion proteins. Immunohistochemistry demonstrated normal function of the hTrx gene-modified hepatocytes, which possessed strong antioxidative capacity as shown by MTT assay. Transplantation of the modified hepatocytes in rats with acute liver failure resulted in significantly lowered serum alanine aminotransferase （ALT） and total bilirubin （TBIL） levels （P 〈0.05）. The hepatocytes exhibited long-term survival and efficient proliferation after transplantation. Fourteen days after the operation, the rat models receiving hTrx gene-modified hepatocytes had significantly higher survival rate than those without the transplantation. Conclusion hTrx gene

关键词： hepatocyte transplantation thioredoxin gene expression liver failure, acute

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光波导激光陶瓷的研究进展与展望

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激光与光电子学进展 2018年第3期55卷 1-21页

作者：李江姜楠葛琳赵玉中国科学院上海硅酸盐研究所透明光功能无机材料重点实验室上海200050

未来二极管抽运固体激光器的重要发展方向是实现"三高",即高功率、高效率和高光束质量的激光输出,而热效应将严重影响固体激光器的激光性能。作为极具发展前景的增益介质材料,激光陶瓷具有连续激光输出能力强、热导率高、可以高浓度掺... 详细信息

未来二极管抽运固体激光器的重要发展方向是实现"三高",即高功率、高效率和高光束质量的激光输出,而热效应将严重影响固体激光器的激光性能。作为极具发展前景的增益介质材料,激光陶瓷具有连续激光输出能力强、热导率高、可以高浓度掺杂等优点,并且容易实现大尺寸、批量化以及复合结构样品制备,而复合结构的增益介质可以有效改善固体激光器的热效应。其中,通过在激光陶瓷中制备光波导结构,可以高效散热、提高抽运效率,获得紧凑且具有高增益的激光系统,该类激光陶瓷有望解决"三高"固体激光器的核心问题。对光波导激光陶瓷的研究进展及其设计原理、制备方法和材料性能做了综述和介绍,最后对光波导激光陶瓷未来的研究做了展望和分析。

关键词：材料固体激光器光波导结构激光陶瓷研究进展展望

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Constraints on holographic QCD phase transitions from PTA observations

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 71-78页

作者： Song He li li Sai Wang Shao-jiang Wang Center for Theoretical Physics and College of Physics Jilin University School of Physical Science and Technology Ningbo University Max Planck Institute for Gravitational Physics (Albert Einstein Institute) CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences (UCAS) School of Physical Sciences University of Chinese Academy of Sciences (UCAS) Theoretical Physics Division Institute of High Energy Physics Chinese Academy of Sciences

The underlying physics of QCD phase transition in the early Universe remains largely unknown due to its strong-coupling nature during the quark-gluon plasma/hadron gas transition, yet a holographic model has been proposed to quantitatively fit the lattice QCD data while with its duration of the first-order phase transition(FoPT) left undetermined. At specific baryon chemical potential, the first-order QCD phase transition agrees with the observational constraint of baryon asymmetry. It, therefore, provides a scenario for phase transition gravitational waves(GWs) within the standard model of particle physics. If these background GWs could contribute dominantly to the recently claimed common-spectrum red noise from pulsar timing array(PTA) observations, the duration of this FoPT can be well constrained, and the associated primordial black holes are still allowed by current observations.

关键词： pulsar timing array QCD phase transition gravitational waves primordial black holes

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Sea Breeze Front Storm and Its Composite Analysis in Beibu Gulf

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Meteorological and Environmental Research 2011年第9期2卷 20-23,27页

作者： LU Wei-ping liANG Wei-liang li jiang-nan liN Zhen-min liN Mo li Jing Guangxi Institute of Meteorological and Disaster-Mitigation Research Nanning 530022China School of Environmental Science and Engineering of Sun Yat-Sen University Guangzhou 510275China Guangxi Meteorological Observatory Nanning 530022China

[Objective] The aim was to study the sea breeze front storm and its composite analysis in Beibu Gulf. [Method] By dint of routine observation data, ground automatic meteorology data and European numerical mode grid data, rainstorm caused by sea breeze in Guangxi during 1990 and 2007 and the strong convection triggered by sea breeze on June 5 in 2008 were expounded. The main characteristics of the configuration of circulation in the low and high latitude of breeze front of middle scale were summarized. [Result] Sea breeze front storm system was an important middle scale sea breeze front system that triggered storm in the Beibu Gulf. Sea breeze in Beibu Gulf occurred most easily during the southwest monsoon eruption period. Case study pointed out that after sunrise, the continental and island temperature in Beibu Gulf turned from warm-ocean-cold-island into warm-island-cold-ocean. The southerly airstream of high temperature and high humidity met with the relatively low temperature and dry northerly airstream in Beibu Gulf, and triggered vertical circulation and stimulated ground middle scale sea breeze front system. Composite analysis referred to the circulation characteristics of the ocean and continental temperature in Beibu Gulf. The upper air of south China was in strong divergence center. The air pressure was high in the east and low in the west. Beibu Gulf was in the southerly torrent belt in front of the trough and after the latitude in cyclonic circulation convergence area. The strata unstable structure of the divergence in the upper air and the convergence in the lower layer and the 'pumping effect' provided upward dynamics for the ocean circulation development. The southerly brought rich water vapor to the Beibu Gulf, which was conductive to the formation of strong convective cloud system in the lower layer and the generation of precipitation. [Conclusion] The research provided references for the study on the characteristics of middle scale convective system

关键词： Beibu Gulf Sea breeze front Characteristics Composite analysis China

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耕地保护中区域协调保护模式的博弈

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安徽农业科学 2010年第23期38卷 12838-12839,12841页

作者：李江南昌吉学院经济管理系新疆昌吉831100

对使用博弈模型对现行耕地保护和区域协调耕地保护2种模式进行了探讨分析。结果表明,在相同的成本下,区域协调耕地保护模式可以实现耕地保护的最优化。

关键词：区域协调耕地保护博弈

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