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Deformation characteristics of the ‘7.20' heavy rainfall event in North China

Atmospheric and Oceanic Science Letters 2019年第1期12卷 21-29页

作者： RAN Lingkun LI Na JIAO Yayin JIAO Baofeng ZHANG Linna Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric Physics Chinese Academy of Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan Province Handan Meteorological Bureau Beijing Meteorological Bureau

A heavy-rainfall event that occurred in North China during 19–20 July 2016,resulting in severe flooding,was investigated in this *** this event,high-value total deformation overlapped the precipitation region,implying a close relationship between *** deriving the nongeostrophicωequation in a non-uniformly saturated moist atmosphere,the relation between vertical velocity and deformation was *** q-vector divergence on the right-hand side of the newωequation was divided into three compositions,associated with horizontal divergence,vertical vorticity,and horizontal-wind deformation,*** was found that the deformation component of q-vector divergence contributed most to the negative q-vector divergence in the precipitation region,implying an important role of deformation forcing in facilitating the vertical *** order to track the precipitation on the basis of deformation,potential deformation was proposed by virtue of the generalized potential *** high-value potential deformation and precipitation were always overlapping,and shared an analogous temporal *** means that potential deformation can reflect the variation of heavy precipitation to a certain extent,and can serve as a tracker of the precipitation region.

关键词： Deformation q-vector precipitation ascending motion

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Diagnosis of deformation-derived ascending areas in a rainband

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Atmospheric and Oceanic Science Letters 2018年第4期11卷 300-306页

作者： LI Na RAN Ling-Kun GAO Shou-Ting Key Laboratory of Cloud-Precipitation Physics and Severe Storms Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Plateau Atmosphere and Environment Key Laboratory of Sichuan Province SichuanChina

This paper demonstrates that,for a moist baroclinic frontal system,the large-value deformation belt in the low-level atmosphere overlaps with *** precisely describe the relationship between deformation and heavy precipitation,deformation is introduced into the nongeostrophic q^#-vector.q^#is then decomposed into three parts:the divergence-related term,the vorticity-related term,and the deformation-related *** calculating the divergence of q#and its components,it is found that in strong ascending areas within precipitation regions the nongeostrophic q^#-vector divergence shows strong negative *** deformational component can contribute about 68%to these negative *** verifies that strong deformation in a precipitating atmosphere is favorable for the development of convection and *** addition,by calculating the correlation coefficients between the q^#-vector(including its components)divergence and vertical motions,it is also found that the q^#-vector divergence shows higher correlation with vertical motion within the precipitation belt and lower correlation in the non-precipitation areas,which indicates a larger contribution of q^#to vertical motion when precipitation occurs and implies an effect of q^#to the precipitation distribution or spatial *** the three components of the q^#-vector,the correlation coefficients between the deformational component and vertical motion are the most similar in pattern to that of the correlation coefficients between the q#-vector and vertical motion,which further reflects the important contribution of deformation to the large spatial variability of precipitation.

关键词： Deformation q-vector precipitation ascending motion

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Trigger mechanism of a snow burst event in Northeast China

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Atmospheric and Oceanic Science Letters 2021年第2期14卷 13-20页

作者： Baofeng Jiao Lingkun Ran Xinyong Shen Yanbin qi 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 TechnologyNanjingChina Institute of Atmospheric Physics Chinese Academy of SciencesBeijingChina Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) ZhuhaiChina Jilin Weather Modification Office ChangchunChina

A snow burst event characterized by brief heavy snowfall affected Northeast China and caused serious social impact on 26 January 2017,with the snowband generally aligned with a northeast–southwest-oriented cold *** reanalysis data were used to diagnose the possible trigger *** showed there were two stages:(a)an initial stage far away from the Changbai Mountains,and(b)an enhancement stage under the influence of high *** the initial stage,the coupling of low-level frontogenesis and a favorable convergence pattern caused strong upward motion,contributing to the release of *** the snowband approached the high terrain during the enhancement stage,the various instabilities were triggered by the low-level frontogenesis,terrain circulation,and strong wind shear associated with the low-level ***,a modified q-vector divergence including generalized potential temperature was calculated to diagnose the vertical *** showed that the frontogenesis terms contributed greatly to the negative q-vector divergence along the moist isentropes,while the pseudo-vorticity terms played a role in the regions with strong wind shear associated with the low-level jet in the warm section,suggesting both were important in stimulating the ascending *** regions with negative q-vector divergence had a close relationship with the vertical structure of convection,indicating the potential to track the development of the snowband in the next few hours.

关键词： Snow burst Frontogenesis q-vector

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The Analysis of the Asymmetric Precipitation Caused by the No.10 Tropical Cyclone “Damrey” in 2012 Based on Observation and Numerical Simulation

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Journal of Geoscience and Environment Protection 2022年第8期10卷 145-157页

作者： Jian Li Jiqiu Liu Meteorology Center of East China Regional Air Traffic Management Bureau of Civil Aviation of China Shanghai China

The No.10 tropical cyclone “Damrey” in 2012 is the first landing typhoon on the north of the Yangtze River after 1949. After its landing, Damrey showed an obvious asymmetric structure and precipitation. Using the ERA-interim reanalysis data from the European Centre for Medium-Range Weather Forecasting (ECMWF), the study simulated the whole process of Damrey from pre-landing to extinct by using WRF model. Based on the model result and FY-2E satellite data and observation data, the study analysis the causes of the asymmetric structure of Damrey. It is found that the descending motion is strong on the west and south sides of the typhoon, they blocked the southwest water vapor transport. So the development of convective cloud system was hindered, and the wind shear on the west and south sides on the typhoon was stronger than on the east and north. It caused the result of the precipitation on the east and north sides of typhoon much more than on the west and south. q-vector, upper level jets and other factors are also analyzed in this study.

关键词： Typhoon Damrey Asymmetric Structure q-vector WRF Model

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