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Simulation of 1991-2005 Meiyu seasons in the Yangtze-Huaihe region using BCC_RegCM 1.0

Chinese Science Bulletin 2010年第11期55卷 1077-1083页

作者： HU YaMin1,2,3& DING YiHui4 1 Institute of Tropical and Marine Meteorology, china Meteorological Administration, guangzhou 510080, china 2 guangdong climate center, guangzhou 510080, china 3 Chinese Academy of Meteorological Sciences, Beijing 100081, china 4 National climate center, china Meteorological Administration, Beijing 100081, china Institute of Tropical and Marine Meteorology China Meteorological Administration Guangzhou 510080 China guangdong climate center Guangzhou 510080 China Chinese Academy of Meteorological Sciences Beijing 100081 China National climate center China Meteorological Administration Beijing 100081 China

By using BCC_RegCM 1.0 (RegCM for short) from Beijing climate center (BCC), china Meteorological Administration (CMA), the Meiyu season characters over the Yangtze-Huaihe region during 1991-2005 are simulated. The major conclusions of this study may be summarized as the following: (1) RegCM can reproduce the interannual variation and the spatial distribution of the summertime precipitation and temperature in the Yangtze-Huaihe region. (2) By use of a generalized Meiyu criterion and in accordance with model-calculated precipitation and temperature, the Meiyu onset and ending date have been determined. Compared with the observation, RegCM can simulate the interannual variation of the Yangtze-Huaihe Meiyu with preferable capability for most of the normal Meiyu years (such as 1995, 1997, 2000, 2001, 2002 and 2004), especially for the rich Meiyu years of 1996, 1998 and 1999. (3) In terms of the average simulation for the recent 15 years, the timings of onset and ending of Meiyu occur on June 1 and July 13, respectively, which are earlier than the climatological observation. For duration, Meiyu persists for 32 d, 3 d shorter than the observation. The index of Meiyu intensity is 2.45, while the climatological one is 3.00. Therefore, RegCM is capable of simulating the climatological Meiyu duration and intensity, while the capability of simulating the onset and ending date of Meiyu still needs to be improved.

关键词：梅雨季节模拟计算长江气候观测发病时间强度指数中国气象局空间分布

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An improvement on summer regional climate simulation over East china: Importance of data assimilation of soil moisture

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Chinese Science Bulletin 2010年第9期55卷 867-873页

作者： HU YaMin1,2,3, DING YiHui4 & LIAO Fei2 1 Institute of Tropical and Marine Meteorology, china Meteorological Administration, guangzhou 510080, china 2 guangdong climate center, guangzhou 510080, china 3 Chinese Academy of Meteorological Sciences, Beijing 100081, china 4 National climate center, china Meteorological Administration, Beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i.e., BCC_RegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime season over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the magnitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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An improvement on summer regional climate simulation over East china: importance of data assimilation of soil moisture

An improvement on summer regional climate simulation over Ea...

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第七届全国优秀青年气象科技工作者学术研讨会

作者： HU YaMin1, 2, DING YiHui3 & LIAO Fei2 1 guangdong climate center, guangzhou 510080, china 2 Institute of Tropical and Marine Meteorology, china Meteorological Administration, guangzhou 510080, china 3 National climate center, china Meteorological Administration, Beijing 100081, china

The Newtonian relaxation is used to assimilate data from the Second Global Soil Wetness Project (GSWP2) into the initial field for soil moisture in a regional climate model (i. e., BCCegCM 1.0, hereinafter called RegCM). The results show that different nudging parameters can improve the simulation of the air temperature and the precipitation to some extent in summertime sea-son over East china. When the nudging intensity is 0.5 and nudging duration is 5 days, the result is desirable. Introducing the data assimilation of soil moisture into RegCM, the amelioration is not only in the spatial distribution pattern but also in the mag-nitude of the temperature and the precipitation. More specifically, the assimilation experiments have corrected the systematical cold bias of the air temperature and the precipitation on the low side, which is much closer to the observation compared with the control experiment. On the whole, the assimilation experiments shed light on the fact that the simulated bias in the original RegCM may be affected by the description of soil moisture in the land surface process. Therefore, the effect of soil moisture in RegCM should be paid more attention in the future.

关键词： soil moisture Newtonian relaxation data assimilation regional climate simulation

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Mechanism of the Spring Persistent Rains over southeastern china

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Science china Earth Sciences 2007年第1期50卷 130-144页

作者： WAN RiJin1,2,3 & WU GuoXiong1 1 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Mechanicals (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, china 2 guangdong climate and Agrometeorology center, guangzhou 510080, china 3 Shanghai Typhoon Institute of china Meterological Administration, Shanghai 200030, china State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Mechanicals (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China guangdong climate and Agrometeorology center Guangzhou 510080 China Shanghai Typhoon Institute of china Meterological Administration Shanghai 200030 China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Mechanicals (LASG) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The Spring Persistent Rains (SPR) in the areas to the south of middle and lower reaches of the Yangtze River or over southeastern china (SEC) is a unique synoptic and climatic phenomenon in East Asia. This study reveals a possible mechanism responsible for the climatic cause of SPR formation through climatic mean data analysis and sensitive numerical model experiments. SEC is located at the down-stream of the southwesterly velocity center (SWVC) which lies on the southeastern flank of the Tibetan Plateau (TP). As a result, there are strong southwesterly wind velocity convergence and moisture con-vergence over SEC. This is the immediate climatic cause of SPR formation. In spring, the seasonal evolution of the southwesterly velocity consists with the surface sensible heating over southeastern TP, indicating that the formation of SPR is related to not only the southwesterly wind of mechanical de-flected flow of TP, but also the southwesterly wind of thermal-forced cyclonic low circulation. Sensitive numerical experiments demonstrate that, without TP, both SWVC and the SPR rain belt will disappear. The southwesterly wind velocity increases almost linearly with the amount of the total diabatic heating with TP rising. Therefore, SWVC is the result of the mechanical forcing and thermal forcing of TP. All these strongly suggest that the presence of TP plays a primary role in the climatic formation of SPR.

关键词： SPR climatic cause of formation southwesterly Tibetan Plateau sensitive experiments.

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Field measurement and analysis of turbulence coherence for Typhoon Nuri at Macao Friendship Bridge

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Science china(Technological Sciences) 2010年第10期53卷 2647-2657页

作者： SONG LiLi1, PANG JiaBin2, JIANG ChengLin3, HUANG HaoHui3 & QIN Peng3 1 guangzhou Institute of Tropical and Marine Meteorology, CMA, guangzhou 510080, china 2 Tongji University, Shanghai 200092, china 3 guangdong climate Centre, guangzhou 510080, china guangzhou Institute of Tropical and Marine Meteorology CMA Guangzhou China Tongji University Shanghai China guangdong climate Centre Guangzhou China

For the purpose of investigating the turbulent and spatial coherent characteristics of strong wind during typhoon landing period,two 3-dimensional ultrasonic anemometer stations were set up 30 m horizontally apart on the Macao Friendship Bridge to caputure the turbulent wind velocities of Typhoon Nuri. Based on the reliable and representative field measured data,the mean wind speed and direction,turbulence intensity,turbulence integral scale,turbulence power spectra,spatial correlation coefficient and coherence function were statistically evaluated. The field measurement analysis have presented the following results: 1) Two anemometer stations provided consistent results. The mean wind speed variation in time domain presented typical M-shape curves. The strong wind (10-minute mean wind speed higher than 8th grade in Beaufort wind scale) direction changed in a big range up to 122-degrees-angle,indicating the field measurements scoped over the typhoon landing period. 2) The ratio of the longitudinal,lateral and vertical turbulence intensities of the strong wind in the typhoon eye wall region was 1:0.96:0.36. Compared with the code defined ratio 1:0.88:0.5,the lateral component was larger and the vertical component was smaller. 3) The value of integral scale increased when the eye wall of Typhoon Nuri passed over the field measurement site. Before the center of Typhoon Nuri arrived,the integral scale of the strong typhoon wind was about twice compared with that for the non-typhoon wind. 4) The spatial correlation of the turbulent wind,coherence function curve and the decay factor had significant differences at different times during the typhoon process. In the eye wall of the typhoon,the horizontal spatial correlation was relatively strong and horizontally spatial correlation spectrum decayed slower with frequency increase. The minimum regressed coefficient C in coherence function model was 4.67,which is lower than the code defined low limit. The maximum decay factor w

关键词： typhoon field measurement and analysis turbulence characteristics coherence spectral function

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Impact of EnKF assimilating Himawari-8 all-sky infrared radiance on the forecasting of a warm-sector rainstorm event

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Science china Earth Sciences 2024年第10期67卷 3110-3127页

作者： Shanshan LOU Lei ZHU Xuexing QIU guangzhou CHEN Song YUAN Shengnan ZHOU Anhui Meteorological Observatory Hefei 230031China Key Laboratory of Meteorological Disaster Ministry of Education(KLME)Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Joint International Research Laboratory of Climate and Environment Change(ILCEC)Nanjing University of Information Science&TechnologyNanjing 210044China Huaihe River Basin Meteorological center Hefei 230031China Shouxian National Climatology Observatory Huaihe River Basin Typical Farm Eco-Meteorological Experiment Field of CMAShouxian National Comprehensive Meteorological Observation Special Experimental OutfieldShouxian 232200China Anhui Province Key Laboratory of Atmospheric Science and Satellite Remote Sensing Hefei 230031China

Warm-sector rainstorms are highly localized events, with weather systems and triggering mechanisms are not obvious,leading to limited forecasting capabilities in numerical models. Based on the ensemble Kalman filter(PSU-En KF) assimilation system and the regional mesoscale model WRF, this study conducted a simulation experiment assimilating all-sky infrared(IR)radiance for a warm-sector rainstorm in East china and investigated the positive impact of assimilating the Himawari-8 moisture channel all-sky IR radiance on the forecast of the rainstorm. Results indicate that hourly cycling assimilation of all-sky IR radiance can significantly improve the forecast accuracy of this warm-sector rainstorm. There is a notable increase in the Threat Score(TS), with the simulated location and intensity of the 3-hour precipitation aligning more closely with observations. These improvements result from the assimilation of cloud-affected radiance, which introduces more mesoscale convective information into the model's initial fields. The adjustments include enhancements to the moisture field, such as increased humidity and moisture transport, and modifications to the wind field, including the intrusion of mid-level cold air and the strengthening of lowlevel convergent shear. These factors are critical in improving the forecast of this warm-sector rainstorm event.

关键词： Ensemble Kalman filter WRF model Himawari-8 All-sky radiance Warm-sector rainstorm

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Analysis on the Microstructure and Performance Evolvement of Alloyed Tool Steel Hot Rolling Strip Produced by CSP Technology

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Journal of Iron and Steel Research International 2011年第S1期18卷 621-624页

作者： CHEN Jing-hu 1,2,JIE Xiao-hua 1 (1.Faculty of Materials and Energy,guangdong University of Technology,guangzhou510006,guangdong,china 2.Technology center of guangzhou Steel Group Co Ltd.,guangzhou510380,guangdong,china) guangdong Univ Technol Fac Mat & Energy Guangzhou 510006 Guangdong Peoples R China guangzhou Steel Grp Co Ltd Ctr Technol Guangzhou 510380 Guangdong Peoples R China

This thesis determinates the microstructure and inclusions of the alloyed tool steel by CSP processing with the help of *** results show that the slab microstructures are the fine branched crystalline grains and the branch width has little disparity from the surface to the central *** the product,the grain microstructures are fine pearlites and few ferrites with the pearlite space 0.4μm to 0.2μm.

关键词： compact strip production alloyed tool steel microstructure grain

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Temporal and Tight Hepatitis C Virus Gene Activation in Cultured Human Hepatoma Cells Mediated by a Cell-Permeable Cre Recombinase

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Acta Biochimica et Biophysica Sinica 2004年第10期36卷 687-694页

作者： Dong XIAO*, Kang XU1, Ying YUE, Zhong-Min GUO, Bing HUANG, Xin-Yan DENG, Huan TANG2, and Xi-Gu CHEN* center of Experimental Animals, Zhongshan University, guangzhou 510080, china 1The first affiliated hospital of Sun Yat-sen University, Zhongshan University, guangzhou 510080, china 2The Third Military Medical University, Chongqing 400010, china center of Experimental Animals Zhongshan University The first affiliated hospital of Sun Yat-sen University Zhongshan University The Third Military Medical University

Conditional gene expression has greatly facilitated the examination of the functions of particular gene products. Using the Cre/lox P switching expression system, we plan to develop efficient conditional transgeneactivation of hepatitis C virus core protein (HCV-C) cDNA (nucleotide 342–914) in the transgenic mice to overcome “immune tolerance” formed during the embryonic period and “immune escape” against hepatitis virus antigen in our project. To use this system in vivo, the dormant transgenic construct, i.e., pApoE-SCS-EGFP-HCV-C, was generated using techniques of standard molecular biology. The liver- specific human apoE promoter was here used to target expression of genes of interest (EGFP and HCV-C) to murine liver. Prior to generating the transgenic mice, the availability of Cre/lox P system and construct functionality were successfully verified by a cell-free recombination system and via checking the expression of EGFP and HCV-C in the human hepatoma cells at the mRNA and protein levels. These results suggest that the Cre/lox P system could tightly control expression of EGFP and HCV-C in vitro, which laid a solid foundation to conditionally activate expression of target gene(s) in transgenic mice by Cre-mediated site-specific recombination.

关键词： hepatitis C virus Cre/lox P switching expression system cell-free and intracellular recombination systems cell-permeable Cre recombinase EGFP human hepatoma cells

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Tetracycline-controlled transcriptional regulation systems: countermeasures to eliminate basal transgene leaks in Tet-based systems

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Progress in Natural Science:Materials International 2007年第1期17卷 11-19页

作者： XIAO Dong, SUN Yan, GU Weiwang and CHEN Xigu ( center of Experimental Animals and Institute of Comparative Medicine, Southern Medical University, guangzhou 510515, china center of Experimental Animals, Sun Yat-sen University, guangzhou 510080, china) center of Experimental Animals and Institute of Comparative Medicine Southern Medical University Guangzhou 510515 China

To analyze the function of any given transgene(s) accurately in transgenic mice, and to produce credible transgenic animal models of various human diseases (precisely and realistically mimicking disease states), it is critical to be able to control gene expression in the animals conditionally. The ability to switch gene expression "on" or "off" in the restricted cells or tissue(s) at specific time(s) allows unprecedented flexibility for exploring gene function(s) in both the health and the disease. Pioneering work on inducible transgene expression has led to the development of a wide variety of controlled gene expression systems that meet this criterion. Among them, the tetracycline-inducible systems (e.g. Tet-off and Tet-on) have been widely, frequently and successfully employed in vitro and in vivo. These systems, however, are not always tight but leaky; sometimes the leakage is significant. In some circumstances, the resulting leak is acceptable, but in others, it is more problematic. Though these systems face this disadvantage, i. e. basal transgene leakage in vitro and in vivo, several approaches, including using improved versions (e.g. rtTA2S-M2 and rtTA2S-S2) of rtTA, tetracycline-controlled transcriptional silencer (tTS), an "ideal" minimal promoter in responsive components or combinations thereof, have been developed to avoid this limitation effectively. In this review we discuss the countermeasures available to eliminate basal transgene leakage from Tet-based systems.

关键词： tetracycline inducible system transgenic mice leaky expression transcriptional silencer.

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Entropy correction of BTZ black holes in a tunneling framework

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Science china(Physics,Mechanics & Astronomy) 2010年第8期53卷 1427-1433页

作者： ZHANG JingYi center for Astrophysics, guangzhou University, guangzhou 510006, china guangzhou University Center for Astrophysics Guangzhou China (GRID:grid.411863.9) (ISNI:***)

In this paper, using the Parikh-Wilczek tunneling framework, we first calculate the emission rates of non-rotating BTZ black holes and rotating BTZ black holes to second order accuracy. Then, by assuming that the emission process satisfies an underlying unitary theory, we obtain the corrected entropy of the BTZ black holes. A log term emerges naturally in the expression of the corrected entropy. A discussion about the inverse area term is also presented.

关键词： Hawking radiation black hole tunneling black hole entropy correction quantum theory

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