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An Analysis of the Low Moving Speed of Landfalling Typhoon In-Fa in 2021

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Journal of Tropical Meteorology 2024年第1期30卷 51-60页

作者：郑丽娜吕新刚李瑞 Jinan meteorological bureau of Shandong province Jinan 250102 China

The movement speed of Typhoon In-Fa(2021)was notably slow,at 10 km h-1or less,for over 20 hours following its landfall in Zhejiang,China,in contrast to other typhoons that have made *** study examines the factors contributing to the slow movement of Typhoon In-Fa,including the steering flow,diabatic heating,vertical wind shear(VWS),and surface synoptic situation,by comparing it with Typhoons Yagi(2018)and Rumbia(2018)which followed similar *** findings reveal that the movement speed of Typhoons Yagi and Rumbia is most closely associated with their respective 500 h Pa environmental winds,with a steering flow of 10^(-12)m s^(-1).In contrast,Typhoon InFa’s movement speed is most strongly correlated with the 850 h Pa environmental wind field,with a steering flow speed of only 2 m s^(-1).Furthermore,as Typhoon In-Fa moves northwest after landfall,its intensity is slightly greater than that of Typhoons Yagi and Rumbia,and the pressure gradient in front of Typhoon In-Fa is notably smaller,leading to its slow ***,the precipitation distribution of Typhoon In-Fa differs from that of the other two typhoons,resulting in a weak asymmetry of wavenumber-1 diabatic heating,which indirectly affects its movement *** analysis indicates that VWS can alter the typhoon’s structure,weaken its intensity,and ultimately impact its movement.

关键词： landfalling typhoon steering flow diabatic heating VWS

Changing characteristics and spatial differentiation of spring precipitation in Southwest China during 1961-2012

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Chinese Physics B 2015年第2期24卷 526-533页

作者：刘洪兰张强张俊国胡文超郭俊琴王胜 Zhangye meteorological bureau Institute of Arid Meteorology China Meteorological AdministrationKey Laboratory of Arid Climatic Change and Disaster Reduction of Gansu ProvinceKey Laboratory of Arid Climate Change and Disaster Reduction of China Meteorological Administration Zhangye Middle School meteorological Service Center of Gansu province Northwest Regional Climate Center Jinta County meteorological bureau

In this study,we analyze spring precipitation from 92 meteorological stations spanning between 1961 and 2012 to understand temporal-spatial variability and change of spring precipitation over Southwest *** analysis methods are used for different purposes,including empirical orthogonal function（EOF） analysis and rotated EOF（REOF） for analyzing spatial structure change of precipitation anomaly,and the Mann-Kendall testing method to determine whether there were abrupt changes during the analyzed time *** find that the first spatial mode of the precipitation has a domain uniform structure;the second is dominated by a spatial dipole;and the third contains five variability *** 2000 s is the decade with the largest amount of precipitation while the 1990 s is the decade with the smallest amount of *** year-to-year difference of that region is large：the amount of the largest precipitation year doubles that of the smallest precipitation *** also find that spring precipitation in Southwest China experienced a few abrupt changes：a sudden increase at 1966,a sudden decrease at 1979,and a sudden increase at *** speculate that the spring precipitation will increase gradually in the next two decades.

关键词： spring precipitation temporal-spatial structure 500-hPa level Southwest region

ANALYSIS ON THE CHARACTERISTICS OF TROPICAL CYCLONES MAKING LANDFALL ON DIFFERENT REGIONS OF CHINESE MAINLAND

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Journal of Tropical Meteorology 2013年第3期19卷 276-283页

作者：尹宜舟朱志存叶殿秀黄强 Center for Earth System Science Tsinghua University National Climate Center China Meteorological Administer Nanjing University of Information Science & Technology Pinghu meteorological bureau Zhejiang Province Haining meteorological bureau Zhejiang Province

The locations(longitudes and latitudes)of the tropical cyclones(TCs)making landfall on the Chinese mainland from 1949 to 2008 are investigated in detail by using ArcGis and FORTRAN *** southeast coastline[110 to 122°E)with most landfall TCs was selected as the key region,which was divided into 12 subsections with 1°intervals of *** study period was from July to September in each *** result showed that the average sustaining time of TCs making landfall on the subsections east of 118°E is longer than those west of 118°*** landfall,the averaged TC intensity in the subsections east of118°E is stronger than that west of *** landfall,however,the difference between the west and east is not *** index of destructive potential for the period before/after landfall was defined as TDP1/*** maximum of TDP1/TDP2 occurred in the subsection of[119,120°E)/[110,111°E).The ENSO impact on the frequency and average location of landfall TC over the whole region at 110 to 122°E is not obvious,but the effect varies with specific *** is little differences of averaged TDP1 in the subsections between different phases of ENSO events,but the averaged TDP2 is larger in the warm events than that in the cold *** rainstorm days of each station caused by TCs in different subsections were counted *** results suggested that the rainstorm days of the subsections east of 118°E are much more than those west of 118°*** larger values are primarily distributed at the subsections of[119,120°E)and[110,111°E).

关键词： Chinese mainland landfall tropical cyclone characteristics analysis destructive potential rainstorm frequency

Characteristics of earthquake sequences in the Kuril Islands

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Acta Seismologica Sinica(English Edition) 1999年第3期12卷 292-297页

作者：刁桂苓李钦祖陈敬伟于利民孙佩卿 1. Seismological bureau of hebei province 050021 Shijiazhuang China

A total of 6 earthquake sequences that occurred in the Kuril Islands region in 1964-1976 has been collected and their characteristics have been analyzed. When these sequences are judged from the spatial relation between their source distribution and the subduction zone, all of them belong to plate boundary earthquake sequences. The parameters of 5 ones among these sequences, which are located just in the subduction zone, are in fair agreement. For these 5 sequences, the major axis of epicenter distribution area is longer; the ratio of major axis to minor axis is high; the focal depths have a greater range; the directions of dip are consistent with the direction of subduction; the dip angles are of moderate value. It is estimated that the only exception is related to the low accuracy of data in the early stage.

关键词： Kuril Islands earthquake sequence plate boundary earthquake

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

Grouping　occurrences　being　the　fundamental　feature　of　the　strong　earthquakes　in　Chinese　mainland

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Acta Seismologica Sinica(English Edition) 1994年第1期7卷 15-22页

作者：李钦祖于利民王吉易万迪陈绍绪 1. Seismological bureau of hebei province 050021 Shijiazhuang China

The temporal and spatial distributions of all the 259 M≥6 earthquakes of eastern Chinese mainland (λ≥108° E) and its adjacent area and all the 153 M≥7 earthquakes of western Chinese mainland (λ<108°E) and its adjacent area up to 1991 were analyzed *** earthquakes are called as strong earthquakes and those of the east before and after 1600,and those of the west before and after 1900, are called respectively as former ones and latter *** of these events were divided into 45 sets of which the each relatively concentrated in both time and space and took the form of *** the grouping form,the probability of occurrence of a strong earthquake higher than the average appeared simultaneously in time and *** grouping occurrences of the strong earthquakes of Chinese mainland has been determined as a fundamental feature of the seismicity.

关键词： Chinese mainland strong earthquakes earthquake set grouping occurrence

ANALYSIS OF A STRONG MESOSCALE ENERGY FRONT CAUSING AN EXCEPTIONAL RAINSTORM

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Acta meteorologica Sinica 2004年第4期18卷 479-490页

作者：濮梅娟沈树勤曾明剑吴海英 Nanjing Institute of Meteorology Jiangsu Provincial meteorological bureau meteorological bureau of Jiangsu province

Under the outer-region effect of Typhoon Prapiroon (No.0012),an exceptional rainstorm occurred in northeastern Jiangsu province from 0200 BT (Beijing Time) 30 August to 0800 BT 31 August 2000,which is an event of noticeable locality,abruptness,high intensity,a new record of rainfall measurement in history and very heavy damage caused,leading to the 24 h rainfall of 801.6 mm in County Xiangshui as the center of the rainstorm in the second quadrant of the outer region of the typhoon,i.e.,the northeastern Jiangsu province,where a meso-β energy frontal zone is available at surface,serving as a weather system for generating and maintaining the exceptional *** function used in diagnosing the production and development of the frontal zone displays different effects as follows:the deformation term plays a decisive role,the convergence term makes substantial contribution,but diabatic heating has some effect in the initial stage but less on the *** study of a two-dimensional mesoscale equation shows that the driving around the frontal zone causes a vortex,whose ascending leg transports upwards warm and moist air from the high-energy area to such a level as to make it into cloud for precipitation and whose descending branch is liable for quick falling of raindrops and drawing cold air down onto surface for temperature drop there,allowing the frontal zone to be maintained and intensified,thus making rainfall intensity increased *** research indicates that when such a frontal zone is established the interactions among the convergent line,mesolow, mesohigh and driving-generated disturbance vortex in the neighborhood of the frontal zone are finally for the occurrence of the exceptional rainstorm.

关键词： typhoon meso-β scale energy front rainstorm

Dynamic analysis of water level in the Wanquan Well and the precursory anomalies of earthquakes

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Acta Seismologica Sinica(English Edition) 1999年第3期12卷 357-364页

作者：曹新来张素欣 1. Seismological bureau of hebei province 050021 Shijiazhuang China

According to the characteristics of frequent water level step-variation in the Wanquan Well, the step-variation frequency change on the time axis can be regarded as a sequence of step-variation. A study of the relationship between the process of development and evolution of the sequential step-variation and the regional seismicity indicated that the sequential step-variation anomalies are rather better in coincidence with the time, magnitude and frequency of regional seismic activities, which may predict the seismicity trend in months. Furthermore, on this basis, if the water level changes in a characteristic manner, the seismic regime during the time period from several days to 20 days or more may be evaluated. By using the method presented in this paper we had a prediction about the Baotou ML=6.6 earthquake on May 3, 1996. This event occurred within the predicted time span but with a less magnitude and a little location deviation.

关键词： Wanquan Well water level frequency step-variation sequence

Research on characteristics of magnitude structure of earthquake sequences

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Acta Seismologica Sinica(English Edition) 1998年第1期11卷 41-46页

作者：孙佩卿李钦祖戴英华赵军 1. Seismological bureau of hebei province 050021 Shijiazhuang China

Based on the research on 108 strictly selected earthquake sequences since 1965 in the Chinese mainland, why the magnitude structures of most of these sequences are not in accord with the G R relation has been analyzed and the fitting method with the division of the magnitude structure for the earthquake sequences has been suggested. The characteristic values of this method in the high magnitude interval have mainly been researched, and characteristic magnitude percent f and the slope ratio b 2 of the high magnitude interval, which are different for various sequence types are most obvious. The results show that the N M patterns of magnitude structures for 52.8% earthquake sequences are not in accord with the G R relation from the magnitude less than 80% of the maximum one and that for only 18.5% earthquake sequences show the decrease trend in the high magnitude interval. When b 2 <0 or 0 b 2 <3.0 and f is less, the strong aftershocks in the earthquake sequences are less; when b 2 3.0 for the sequence, several strong aftershocks often occurred; when 0b 2<3.0 and f is bigger, aftershocks with middle magnitude are more in these sequences.

关键词： earthquake sequence magnitude magnitude characteristic