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Microphysical Insights into a Tornadic Supercell from Dual-Polarization Radar Observations in Jiangsu, China on 14 May 2021

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Journal of meteorological Research 2024年第2期38卷 303-320页

作者： Chao YUAN Yang BAI Pengfei SUN Hua BAI Lu XIA China meteorological Administration Tornado Key Laboratory Foshan 528315 Institute of Atmospheric Environment China Meteorological AdministrationShenyang 110166 Panjin National Climate observatory Panjin 124010 Yangzhou meteorological Bureau of Jiangsu Province Yangzhou 225100 Yichun meteorological Bureau of heilongjiang Province Yichun 153000

Tornadoes are incredibly powerful and destructive natural events,yet the microphysical characteristics of the parent storm and its effects on tornadogenesis remain *** study analyzed polarization radar data of a tornadic supercell that occurred in Jiangsu Province of China on 14 May 2021,in comparison with another tornadic supercell and two non-tornadic supercells that occurred in the same region in *** two tornadic supercells exhibited lower differential reflectivity(ZDR)in the hook echo region compared with the non-tornadic supercells,indicating smaller median drop sizes.A distinct increase in ZDR from the melting of frozen hydrometeors,observed between2.5-and 4.0-km altitude in the non-tornadic storms,was absent in the tornadic *** non-tornadic supercells also displayed substantially higher specific differential phase(KDP)below the melting level,likely aroused from enhanced melting and *** findings suggest fundamental microphysical contrasts between tornadic and nontornadic ***,tornadic supercells have smaller droplets and may reduce melting in hook ***,greater separation between the ZDR arc and the KDP foot was observed during *** vertical gradient of KDP related to the cooling pool strength of the hook echo,regulating rear-flank downdraft *** the limited number of cases investigated,the findings of this study indicate that monitoring ZDR,KDP,and drop size distribution trends could assist with tornado prediction and warnings.

关键词： tornado polarimetric radar supercell hook echo drop size distribution

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BMA probability quantitative precipitation forecasting of land-falling typhoons in south-east China

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Frontiers of Earth Science 2019年第4期13卷 758-777页

作者： Linna ZHAO Xuemei BAI Dan QI Cheng XING Chinese Academy of meteorological Sciences Beijing 100081China heilongjiang meteorological observatory Harbin 150001China National meteorological Centre Beijing 100081China heilongjiang Mulan County meteorological observatory Mulan 151900China

The probability of quantitative precipitation forecast(PQPF)of three Bayesian Model Averaging(BMA)models based on three raw super ensemble prediction schemes(i.e.,A,B,and C)are established,which through calibration of their parameters using 1-3.day precipitation ensemble prediction systems(EPSs)from the China meteorological Administration(CMA),the European Centre for Medium-Range Weather Forecasts(ECMWF)and the National Centers for Environmental Prediction(NCEP)and observation during land-falling of three typhoons in south-east China in *** comparison of PQPF shows that the performance is better in the BMA than that in raw ensemble *** average,the mean absolute error(MAE)of 1 day lead time forecast is reduced by 12.4%,and its continuous ranked probability score(CRPS)of 1-3.day lead time forecast is reduced by 26.2%,*** the amount of precipitation prediction by the BMA tends to be underestimated,but in view of the perspective of probability prediction,the probability of covering the observed precipitation by the effective forecast ranges of the BMA are increased,which is of great significance for the early warning of torrential rain and secondary disasters induced by it.

关键词： Bayesian model averaging probabilistic quantitative precipitation forecasting ensemble prediction typhoon precipitation

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Arabian Peninsula-North Pacific Oscillation and its association with the Asian summer monsoon

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Science China Earth Sciences 2008年第7期51卷 1001-1012页

作者： SUN JianQi1, YUAN Wei2 & GAO YuZhong3.1 Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 2 China meteorological Administration Training Centre, Beijing 100081, China 3.heilongjiang meteorological {3., Harbin 15003., China 1. Nansen-Zhu International Research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China 2. China meteorological Administration Training Centre Beijing 100081 China 3. heilongjiang meteorological observatory Harbin 150030 China

Using correlation and EOF analyses on sea level pressure from 57-year NCEP-NCAR reanalysis data, the Arabian Peninsula-North Pacific Oscillation (APNPO) is identified. The APNPO reflects the co-variability between the North Pacific high and South Asian summer monsoon low. This teleconnec- tion pattern is closely related to the Asian summer monsoon. On interannual timescale, it co-varies with both the East Asian summer monsoon (EASM) and South Asian summer monsoon (SASM); on decadal timescale, it co-varies with the EASM: both exhibit two abrupt climate changes in the middle 1960s and the late 1970s respectively. The possible physical process for the connections between the APNPO and Asian summer monsoon is then explored by analyzing the APNPO-related atmospheric circulations. The results show that with a strong APNPO, the Somali Jet, SASM flow, EASM flow, and South Asian high are all enhanced, and an anomalous anticyclone is produced at the upper level over northeast China via a zonal wave train. Meanwhile, the moisture transportation to the Asian monsoon regions is also strengthened in a strong APNPO year, leading to a strong moisture convergence over India and northern China. All these changes of circulations and moisture conditions finally result in an anoma- lous Asian summer monsoon and monsoon rainfall over India and northern China. In addition, the APNPO has a good persistence from spring to summer. The spring APNPO is also significantly corre- lated with Asian summer monsoon variability. The spring APNPO might therefore provide valuable in- formation for the prediction of Asian summer monsoon.

关键词： Arabian Peninsula-North Pacific Oscillation East Asian summer monsoon South Asian summer monsoon wave train abrupt climate change

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Lithogeochemistry of Volcanic Rocks and Hosted Melt Inclusions in Wudalianchi,heilongjiang,China

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Journal of Earth Science 2009年第5期20卷 771-783页

作者：李霓樊祺诚孙谦孙如波 Institute of Geology China Earthquake Administration Wudalianchi Earthquake and Volcano observatory Heilongjiang Earthquake Administration

Wudalianchi（五大连池） volcanoes are famous Quaternary ones with fairly good volcanic landscape in Northeast *** volcanic rocks are phonotephrite,tephri-phonolite,trachyandesite,and basaltic trachyandesite with SiO2 contents of 47.3.wt.%-54.2 wt.%.The characteristic of high K2O content in Wudalianchi volcanic rocks suggests that they probably share a common potassic magma *** magma evolutions of Wudalianchi volcanic rocks are similar,while the new eruption prod-ucts of Laoheishan（老黑山） and Huoshaoshan（火烧山） volcanoes are slightly more evolved than the old eruption materials,i.e.,the magma of the new eruptions in 1719-1721 from the above two volcanoes is the evolved magma in underground *** main phenocrysts of Wudalianchi volcanic rocks are olivines,clinopyroxenes,and some characteristic K-rich *** various-shaped melt inclu-sions are found in olivine phenocrysts from new eruption products of Laoheishan and Huoshaoshan *** electron microprobe（EMP） analyzing,the contents of SiO2 and total alkali show a wide range,suggesting that the pre-eruptive magma was probably more complicated,or the melt inclusions were rather *** the basis of EMP results,it is believed that the sulfur degassing rate from this new eruption was much higher than that of the millennium eruption of Tianchi（天池） volcano,while the chlorine degassing rate was a magnitude lower than that of Tianchi volcano.

关键词： Wudalianchi volcanic rock Laoheishan volcano Huoshaoshan volcano melt inclusion.

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The effects of cold region meteorology and specific environment on the number of hospital admissions for chronic kidney disease:An investigate with a distributed lag nonlinear model

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Frigid Zone Medicine 2023年第2期3卷 65-76页

作者： Xinrui Wei Rui Jiang Yue Liu Guangna Zhao Youyuan Li Yongchen Wang Department of General Practice the Second Affiliated Hospital of Harbin Medical UniversityHarbin 150001China Harbin meteorological observatory Harbin Meteorological AdministrationHarbin 150023China heilongjiang meteorological observatory Heilongjiang Meteorological AdministrationHarbin 150030China

Objective:To explore the effects of daily mean temperature(°C),average daily air pressure(hPa),humidity(%),wind speed(m/s),particulate matter(PM)2.5(μg/m3.and PM10(μg/m3.on the admission rate of chronic kidney disease(CKD)patients admitted to the Second Affiliated Hospital of Harbin Medical University in Harbin and to identify the indexes and lag days that impose the most critical ***:The R language Distributed Lag Nonlinear Model(DLNM),Excel,and SPSS were used to analyze the disease and meteorological data of Harbin from 01 January 2010 to 3. December 2019 according to the inclusion and exclusion ***:meteorological factors and air pollution influence the number of hospitalizations of CKD to vary degrees in cold regions,and differ in persistence or ***-optimal temperature increases the risk of admission of CKD,high temperature increases the risk of obstructive kidney disease,and low temperature increases the risk of other major types of chronic kidney *** greater the temperature difference is,the higher its contribution is to the *** non-optimal wind speed and non-optimal atmospheric pressure are associated with increased hospital ***2.5 concentrations above 40μg/m3.have a negative impact on the ***:Cold region meteorology and specific environment do have an impact on the number of hospital admissions for chronic kidney disease,and we can apply DLMN to describe the analysis.

关键词： chronic kidney disease distributed hysteresis nonlinear model number of hospital admissions meteorological factors air pollution

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An unusual high ozone event over the North and Northeast China during the record-breaking summer in 2018

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Journal of Environmental Sciences 2021年第6期33卷 264-276页

作者： Chuhan Lu Jia Mao Lili Wang Zhaoyong Guan Guangna Zhao Mingge Li Key Laboratory of meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological DisastersNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute id Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China meteorological observatory of heilongjiang Province Harbin 150001China University of the Chinese Academy of Sciences Beijing 100049China

Under the background of global warming,the summer temperature of the North and Northeast China(NNEC)has significantly increased since 2017,which was accompanied by the aggravated ozone(O_(3.)*** 2018,the NNEC experienced a record-breaking summer of the past 40 *** by the abnormal high temperatures,a regional ozone event occurred on 2-3.August,over 63.of 79 selected cities in the NNEC were exposed to O_(3.pollution,and the maximum value of MDA8 O_(3.reached 268μg/m *** indicated that ozone concentrations agree well with the maximum temperature at 2 meters(MT2M)over NNEC with a correlation coefficient of *** the pollution episode,strong downdraft in the local high(3.°N-42.5°N,112.5°E-13..5°E;LH)over the NNEC created the favourable meteorological conditions for O_(3.*** analyzing the horizontal wind and wave activity fluxes(WAFs)at 200 h Pa,we found that the LH formation was resulted from the Rossby wave propagation from upstream along the mid-latitude Asian *** split polar vortex intrusion further strengthened the amplitude of the Rossby wave and reinforced the ***,a secondary circulation between Typhoon Jongdari and the LH contributed to the enhanced LH with strong *** the other hand,the stratospheric intrusions under the deep subsidence also contributed to the enhanced surface O_(3..In this study,the deep-seated meteorological dynamical mechanisms contributing to the abnormal high temperatures were investigated,which can lead to a better understanding of the regional O_(3.pollution over NNEC under the global-warming background.

关键词： Surface O_(3. Abnormal high temperatures North and Northeast China Dynamical mechanism Polar Vortex Typhoon

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SOME RESULTS OF QSO SURVEY BY SLITLESS SPECTRA

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Chinese Science Bulletin 1992年第21期37卷 1847-1848页

作者：赫然陈建生 Visiting astronomer from Mining Institute of heilongjiang Beijing Astronomical observatory Academia Sinica Beijing 100080 PRC

Study of QSOs is an important area of modern astronomy and astrophysics, and is very useful in understanding the origin, the structure and the evolution of the universe. So far more than 4000 QSOs have been discovered by various means. From 1986, we began to make a systematic QSO survey of UKST 855 area with 3. square degrees by means of slitless spectra, whose center is at 10~h40~m+00°00′. The survey was completed recently.

关键词： astrophysics astronomy completed universe finding inhomogeneous galaxies histogram Infrared ultraviolet

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Large-scale inverted-V channels of upflowing oxygen ions pumped by Alfvén waves

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Earth and Planetary Physics 2023年第6期7卷 640-654页

作者： Hui Zhang Jun Zhong SuiYan Fu ZuYin Pu Yong Wei Lun Xie LiBo Liu QiAn Chen Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China heilongjiang Mohe National observatory of Geophysics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China School of Earth and Space Sciences Peking UniversityBeijing 100871China

Large-scale inverted-V channels of upflowing oxygen ions are frequently identified in data collected by Cluster,at all local times,near the open-closed field line boundary over Earth’s high-latitude ionosphere-occur with downward propagating MHD Alfvén waves which have cascaded into kinetic regimes of *** transverse acceleration of the oxygen ions in the center of these structures is interpreted as the integrated energization by these waves along the *** observed within the channels are upward parallel electric fields,a key characteristic of kinetic Alfvén waves,which may contribute not only to lifting the ions but also to precipitating aurora electrons that might initiate ion upflow in the ionosphere *** on five-year observations of Cluster show that the channels typically form during geomagnetic perturbations,particularly when solar-wind dynamic pressure is high or highly *** the open-closed field line boundary,the stronger the wave power,the higher the upward oxygen flux and the higher the beam energy,indicating that these waves provide a simple but efficient way to drive oxygen upflows.

关键词： oxygen ions dispersive Alfvén waves ion outflow parallel electric field

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Intracontinental lithospheric delamination:Constraints from imaging the mantle transition zone beneath the southwestern part of the Sichuan Basin

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中国科学:地球科学英文版 2023年第10期66卷 2340-2352页

作者： Fan YANG Juan LI Sidan CHEN Yun CHEN Long LI Yinshuang AI Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing100049China heilongjiang Mohe observatory of Geophysics Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China CAS Center for Excellence in Deep Earth Science Guangzhou510640China

The southwestern part of the Sichuan Basin(SW-SCB)is adjacent to the eastern Himalayan *** by the Indo-Eurasian collision and subsequent intrusion of the Indian plate into the Eurasian plate during the Cenozoic,this region is ideal for the study of the tectonic evolution of the intracontinental lithosphere and the dynamic processes of deep and shallow *** this study,we applied the receiver function technique to the data obtained from a recently deployed high-density broadband seismic array across the Sichuan Basin and Sichuan-Yunnan block(SCB-SYB).We conducted a multi-frequency and multi-model correction analysis to image the structure of the mantle transition zone beneath this *** results showed the660-km discontinuity gradually increasing in depth by 10-3. km beneath the western side of the Anninghe-Xiaojiang Fault,suggesting the presence of thermal anomalies caused by the subducted Indian plate from west to *** the junction of the SCBSYB,the 410-km discontinuity exhibited a slight uplift of 5-10 km,while the 660-km discontinuity showed a significant depression of~3. km over a lateral range of~150 *** on previous surface GPS observation and dynamic numerical simulation studies,we suggest that the sharp lateral small-scale topography of this 660-km discontinuity beneath the SW-SCB may have resulted from dripping delamination of the lithosphere within the strain localization ***,the aggregation of delaminated lithospheric material at the base of the 660-km discontinuity determines the regional topography of mantle transition zone *** this study,we provided seismological evidence for the challenging detection of small-scale intracontinental lithosphere dripping ***,it provides a new view for studying deep and shallow dynamic processes in intracontinental regions with stress concentration resulting from plate/continental subduction and collision.

关键词： Mantle transition zone Receiver function Southwestern part of the Sichuan Basin Dripping lithospheric delamination Sichuan-Yunnan block

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Synergetic variations of active layer soil water and salt in a permafrost-affected meadow in the headwater area of the Yellow River,northeastern Qinghai-Tibet plateau

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International Soil and Water Conservation Research 2022年第2期10卷 284-292页

作者： Qingfeng Wang Huijun Jin Ziqiang Yuan Chengsong Yang State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of Sciences(CAS)320 Donggang West RoadLanzhouGansu Province730000China School of Civil Engineering Northeast-China Observatory and Research-Station of Permafrost Geo-Environment(Ministry of Education)Institute of Cold-Regions Engineering and EnvironmentNortheast Forestry University26 Hexing RoadHarbinHeilongjiang Province150040China State Key Laboratory of Grassland Agro-Ecosystem Institute of Arid Agro-EcologySchool of Life SciencesLanzhou UniversityLanzhouGansu730000China

The coupling effects and mechanisms of water,heat,and salt in frozen soils are considered to be one of the core scientific issues in frozen soil *** study was based on in situ observation data of active layer soil volumetric water content(VWC),temperature,and bulk electrical conductivity(EC)obtained at an alpine meadow site from October 2016 to November *** site is located in the headwater area of the Yellow River(HAYR).We analyzed the synergetic variations of active layer soil VWC,temperature,and bulk EC during the freeze and thaw processes and discussed the underlying *** the thaw process occurred from 10 to 80 cm depths,the VWC and bulk EC at a 10 cm depth showed syn-chronous high-frequency fluctuations and both increased *** linear decreasing rate of the VWC(bulk EC)at an 80 cm depth in the freeze depths between 0 and 40 cm was 2(1.6e2.3.times that of the VWC(bulk EC)at an 80 cm depth in the freeze depths occurring 0e10 *** soil temperature decreased in the frozen layer,unfrozen water content(bulk EC)decreased nonlinearly along with the absolute value of soil temperature(|T|),following a power(logarithmic)*** study provided data that partly elucidate the interactions among permafrost,meadow,and ecohydrological processes in the ***,our results can be used as a scientific basis for decision making on the protection and restoration of alpine grasslands,as well as for soil salinization studies.

关键词： Freeze and thaw process Active layer Soil water Bulk electrical conductivity Yellow river

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