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Kinematics and Microphysical Characteristics of the First Intense Rainfall Convective Storm Observed by Jiangsu Polarimetric Radar Network

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Journal of Tropical Meteorology 2022年第2期28卷 169-182页

作者： WANG Kun XIA Xin MEI Yi-qing JIANG Ning WAN Qi-lin LI Min gu pei-shu PENG Xiao-yan Nantong Meteorological Bureau NantongJiangsu 226000 China guangdong-Hong Kong-Macao Greater Bay Area Weather Research Center for Monitoring Warning and Forecasting ShenzhenGuangdong 518000 China State Key Laboratory of Severe Weather(LASW)and Institute of Climate System Chinese Academy of Meteorological SciencesBeijing 100081 China Haimen Meteorological Bureau NantongJiangsu 226100 China

The polarimetric radar network in Jiangsu Province has just been operationalized since *** first intense precipitation event observed by this polarimetric radar network and disdrometer occurred during August 28-29,2020 and caused severe flooding and serious damage in eastern Jiangsu *** microphysics and kinetics for this heavy precipitation convective storm is diagnosed in this study,in order to promote the application of this polarimetric radar *** size distribution(DSD)of this event is estimated from measurements of a ground disdrometer,and the corresponding three-dimensional atmospheric microphysical features are obtained from the multiple polarimetric *** to features of updraft and lighting,the evolution of the convective storm is divided into four stages:developing,mature with lightning,mature without lightning and *** DSD of this event is featured by a large number of raindrops and a considerable number of large *** microphysical characteristics are similar to those of warm-rain process,and ice-phase microphysical processes are active in the mature *** composite vertical structure of the convective storm indicates that deep ZDR and KDP columns coincide with strong updrafts during both mature *** hierarchical microphysical structure retrieved by the Hydrometeor Identification Algorithm(HID)shows that depositional growth has occurred above the melting level,and aggregation is the most widespread ice-phase process at the-10℃level or *** negative lightning activity,the presence of strongest updrafts and a large amount of ice-phase graupel by riming between the 0℃and-35℃layers generate strong negative electric fields within the *** convective storms are typical warm clouds with very high precipitation efficiency,which cause high concentration of raindrops,especially the presence of large raindrops within a short period of *** ice-phase microphysical processes above the me

关键词： convective storms cloud microphysics lightning warm rain polarimetric S-band radar observations

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异常分析在长江中下游暴雨分析和预报中的应用

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科学技术与工程 2020年第7期20卷 2546-2553页

作者：王坤张树民李敏陈铁丁爱萍顾沛澍江苏省南通市气象局南通226000 江苏省海门市气象局海门226100

极端天气事件极易造成严重的气象灾害,对人类的生命财产和国民经济建设及国防建设等造成严重损害。使用欧洲中心(ECMWF)的ERA5再分析资料,选择对极端天气有分析和预报有效的原始异常度(RA)和标准化异常度(NA)对南通地区2016年7月11日极... 详细信息

极端天气事件极易造成严重的气象灾害,对人类的生命财产和国民经济建设及国防建设等造成严重损害。使用欧洲中心(ECMWF)的ERA5再分析资料,选择对极端天气有分析和预报有效的原始异常度(RA)和标准化异常度(NA)对南通地区2016年7月11日极端强降水过程进行分析和预报。研究表明,相比于常用的原值场,RA和NA等异常场对分析和预报该次强降水过程更有优势。日常业务中常用的原值场,很难明显给出对极端降水有较好指示意义的预报指标,相比之下,RA和NA这种异常场,可以给出更为有效的极端降水预报指标。这表明,极端降水事件与气象要素的异常部分直接相关。极端降水的落区与位势高度RA和NA的负异常中心接近,湿度的RA和NA正异常出现的时段和位置也与降水出现的时段和位置有较好的相关性,降水强度与湿度和位势高度的RA和NA的异常强度也有一定关系。综合分析不同高度和位置位势高度和湿度的RA和NA,对分析和预报潜在极端天气的落区、强度和出现时段有重要帮助。使用ECMWF的模式预报资料,通过分析不同时效对该次过程的降水和850 hPa位势高度的预报结果,相比于对降水本身的预报,模式对850 hPa位势高度NA场的预报更为稳健,更有利于预报员该次极端降水事件的把握。

关键词：极端降水异常分析标准化异常极端降水预报

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冬季北半球极涡强度对北太平洋风暴轴的影响

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大气科学学报 2013年第3期36卷 297-308页

作者：刘鸣彦朱伟军高洁顾沛澍气象灾害教育部重点实验室(南京信息工程大学) 江苏南京210044 沈阳区域气候中心辽宁沈阳110016

利用美国NCEP/NCAR再分析资料和中国国家气候中心北半球极涡强度指数资料,采用相关和合成分析等方法,初步分析了北半球极涡强度对北太平洋风暴轴的影响及其可能机制。研究发现,北半球极涡与北太平洋风暴轴之间有同步的强弱变化特征,在... 详细信息

利用美国NCEP/NCAR再分析资料和中国国家气候中心北半球极涡强度指数资料,采用相关和合成分析等方法,初步分析了北半球极涡强度对北太平洋风暴轴的影响及其可能机制。研究发现,北半球极涡与北太平洋风暴轴之间有同步的强弱变化特征,在北半球极涡强度的高(低)值年,一般对应着风暴轴强度的增强(减弱),风暴轴区域扰动动能的加大(减弱),天气尺度涡动向极和向上的热量以及西风动量输送的显著增强(减弱)。进一步分析表明,极涡的异常变化可以通过改变欧亚大陆及其下游北太平洋上空的高度场,进而改变东亚西风急流的强度以及风暴轴上游的斜压性,从而对风暴轴产生影响。

关键词：风暴轴极涡气候学

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南通市PM_(2.5)污染特征及与气象因子相关性分析

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职业与健康 2021年第5期37卷 669-673页

作者：缪明榕陈铁顾沛澍袁晶南通市气象局气象探测中心江苏南通226001 南通市气象局气象台江苏南通226001

目的分析南通市细颗粒物(PM_(2.5))污染特征情况以及气象因子对其影响,为进一步防治大气污染提供参考依据。方法利用2018年3月1日—2019年2月28日中国环境监测网数据和南通市地面气象观测站气象要素资料对数据进行分析。结果 PM_(2.5)... 详细信息

目的分析南通市细颗粒物(PM_(2.5))污染特征情况以及气象因子对其影响,为进一步防治大气污染提供参考依据。方法利用2018年3月1日—2019年2月28日中国环境监测网数据和南通市地面气象观测站气象要素资料对数据进行分析。结果 PM_(2.5)浓度季节变化特征明显,春、夏季浓度较低,秋、冬季较高。PM_(2.5)浓度主要范围在7~166μg/m^(3),其中PM_(2.5)浓度较高的天气主要出现在11月,最低出现在8月;南通市PM_(2.5)浓度小时平均值为56.8μg/m3,基本呈现两个波峰和两个波谷;一天当中7:00~9:00和19:00~21:00浓度达到最大,2:00~5:00和15:00~17:00浓度达到最低。结论气压高、湿度低的天气更有利于PM_(2.5)颗粒物的聚集,而降水量和风速的增大有利于PM_(2.5)颗粒物的冲刷和扩散,但四季气象条件的不一样对PM_(2.5)浓度的影响也不一致。夏季气温高,气压低,相对湿度低,PM_(2.5)浓度会较低;而冬季气温低,气压高,相对湿度低时,PM_(2.5)浓度会较高。PM_(2.5)浓度跟四季盛行季风密切相关,四季浓度变化差异明显。

关键词：细颗粒物浓度气象因子相关性

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冬季北大西洋风暴轴的变化及其对西伯利亚高压的影响

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大气科学学报 2015年第2期38卷 232-240页

作者：曾鼎文朱伟军马小娇顾沛澍刘鸣彦高洁气象灾害教育部重点实验室(南京信息工程大学) 江苏南京210044 中国气象局兰州干旱气象研究所甘肃兰州730020 中国气象局干旱气候变化与减灾重点开放实验室甘肃兰州730020

采用1948—2010年NCEP/NCAR逐日再分析资料,计算大西洋风暴轴特征指数和西伯利亚高压特征指数,研究了冬季北大西洋风暴轴的变化及其对西伯利亚高压的影响。结果表明:风暴轴经度指数与西伯利亚高压纬度、强度、面积指数显著相关。风暴轴... 详细信息

采用1948—2010年NCEP/NCAR逐日再分析资料,计算大西洋风暴轴特征指数和西伯利亚高压特征指数,研究了冬季北大西洋风暴轴的变化及其对西伯利亚高压的影响。结果表明:风暴轴经度指数与西伯利亚高压纬度、强度、面积指数显著相关。风暴轴经度指数正异常月,大西洋天气尺度瞬变波活动向东扩展到欧洲乃至乌拉尔山以东,西伯利亚及东亚地区反气旋式波破碎加强,瞬变波对月平均气流的反馈作用使得欧亚大陆上空50°N以北西风加速、50°N以南西风减速;中纬度经向环流加强,气候态的西欧沿岸脊、欧洲东部槽、青藏高原北部脊均加强,东亚大槽减弱东移;在西伯利亚地区,暖空气向北输送加强,来自极区的冷空气南下减弱,致使西伯利亚及东亚地区温度偏高,西伯利亚高压面积减少、纬度偏南、强度减弱。风暴轴经度指数负异常月的情况则反之。

关键词：大西洋风暴轴西伯利亚高压波破碎温度平流

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Quasi-degenerate dark matter for DAMPE excess and 3.5 ke V line

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 30-35页

作者： pei-Hong gu School of Physics and Astronomy Shanghai Jiao Tong University

We propose a quasi-degenerate dark matter scenario to simultaneously explain the 1.4 TeV peak in the high-energy cosmic-ray electron-positron spectrum reported by the DAMPE collaboration very recently and the 3.5 keV X-ray line observed in galaxies clusters and from the Galactic centre and confirmed by the Chandra and NuSTAR satellites. We consider a dark S U（2）′× U（1）′ gauge symmetry under which the dark matter is a Dirac fermion doublet composed of two S U（2）′ doublets with non-trivial U（1 ）′ charges. At the one-loop level the two dark fermion components can have a mass split as a result of the dark gauge symmetry breaking. Through the exchange of a mediator scalar doublet the two quasi-degenerate dark fermdons can mostly annihilate into the electron-positron pairs at the tree level for explaining the 1.4 TeV positron anomaly, meanwhile, the heavy dark fermion can very slowly decay into the light dark fermion with a photon at the one-loop level for explaining the 3.5 keV X-ray line. Our dark fermions can be also verified in the direct detection experiments.

关键词： dark matter DAMPE excess 3.5 ke V line

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An overview on the designs of distributed observers in LTI multi-agent systems

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Science China(Technological Sciences) 2021年第11期64卷 2337-2346页

作者： pei YingQing gu HaiBo LIU KeXin LU JinHu Key Laboratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Automation Science and Electrical Engineering Beijing Advanced Innovation Center for Big Data and Brain ComputingBeihang UniversityBeijing 100191China

With the rapid development of information technologies and cloud computing, sensor networks play an increasingly important role in our society. Over the past few decades, distributed observer theory has attracted unprecedented attention due to its wide potential applications in different areas. Meanwhile, various approaches and algorithms have been proposed and investigated. The design of distributed observers is one of the frontier topics of system and control research, which has the significant theoretical values and broad application prospects. This paper attempts to review the representative models and the corresponding approaches for distributed observer design in linear time-invariant(LTI) systems. Firstly, the research backgrounds and main advances of distributed observer designs are briefly reviewed. Then, recent results of distributed observer designs for discrete-time and continuous-time LTI multi-agent systems(MASs) are introduced in detail, respectively. Finally, the prospects and the future work directions of the design of distributed observers are put forward. The main purpose of this paper is to promote the emerging topic on the designs of distributed observers, with focuses on the interdisciplinary interest from technological sciences.

关键词： multi-agent system linear time-invarient system distributed observer consensus

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Dynamic Matching-Based Spectrum Detection in Cognitive Radio Networks

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China Communications 2019年第4期16卷 47-58页

作者： Yu gu Qingqi pei Hongning Li Shaanxi Key Laboratory of BlockChain and Security Computing Xidian University The State Key Laboratory of Integrated Services Networks Xidian University

Cognitive Radio Network provides an opportunity to reduce the spectrum resource crisis by allowing secondary users to access the idle spectrum allocated to primary users. The precondition of spectrum sharing is to obtain the Spectrum Availability Information(SAI). Energy detection is a typical technology to get SAI. With the mobility of primary users, the energy received by secondary users varies greatly with the distance from the target primary users. Most of the existing energy detection algorithms that use fixed thresholds are not suitable. We propose a Dynamic Matching-Based Spectrum Detection(DMBSD) scheme which can detect sensing data, reduce the impact of malicious data and make final sensing results more accurate with dynamic threshold setting and data matching. Simulation results show that the proposed scheme can detect tempered data, and increase detection probability by decreasing false alarm probability and missed detection probability.

关键词： cognitive radio spectrum sensing degradation domain dynamic matching

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A Heat Transport Model Including the Effect of Non-Maxwellian Electron Distribution and Its Application in Laser Produced Plasma

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Chinese Physics Letters 1999年第7期16卷 520-522页

作者： ZHU Shao-ping gu pei-jun Institute of Applied Physics and Computational Mathematics Beijing 100088

An electron heat transport model is given for studying laser-to-x-ray conversion of inertial confinement *** electron heat flux is derived based on a non-Maxwellian electron distribution,and the behavior of the heat flux is *** effect of the non-Maxwellian electron distribution on inverse bremsstrahlung heating rate and electron-ion heat transfer rate are also included in the present *** simulation results show that the effects of the non-Maxwellian electron distribution on laser absorption efficiency,laser-to-x-ray conversion efficiency and electron temperature in the coronal region are important.

关键词： Maxwell Electron distribution

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Design of non-polarizing thin film edge filters

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第6期7卷 1037-1040页

作者： gu pei-fu ZHENG Zhen-rong State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou 310027 China

The separation between s- and p-polarization components invariably affects thin film edge filters used for tilted incidence and is a difficult problem for many applications, especially for optical communication. This paper presents a novel design method to obtain edge filters with non-polarization at incidence angle of 45°. The polarization separation at 50% trans-mittance for a long-wave-pass filter and a short-wave-pass filter is 0.3 nm and 0.1 nm respectively. The design method is based on a broadband Fabry-Perot thin-film interference filter in which the higher or lower interference band at both sides of the main transmittance peak can be used for initial design of long-wave-pass filter or short-wave-pass filter and then can be refined to reduce the transmittance ripples. The spacer 2H2L2H or 2L2H2L of the filter is usually taken. Moreover, the method for expanding the bandwidth of rejection and transmission is explained. The bandwidth of 200 nm for both rejection region and transmission band is obtained at wavelength 1550 nm. In this way, the long-wave-pass and short-wave-pass edge filters with zero separation between two polarization components can easily be fabricated.

关键词： Thin film optics Interference edge filters Non-polarization design

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