Environment and morphology of mesoscale convective systems associated with the Changma front during 9–10 July 2007

Jeong, Jong‐Hoon; Lee, D. I.; Wang, Chung Chieh; Jang, Sang-Min; You, Cheol‐Hwan; Jang, Myoung-Uoon

doi:10.5194/angeo-30-1235-2012

Cited by 18 publications

(21 citation statements)

References 37 publications

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“…In Figure (d), m s −1 upward motion near the prefrontal zone continued up to 700 hPa and was associated with higher moisture content. Such transportation of moist, warm air to higher elevations increases the amount of water that can be condensed and precipitated (Jeong et al , ). Thus, it is of importance that area of LCSs initiation occurred as the southwesterly high θ e air ascended over the warm front and that convergence occurred as the cold air below subsided.…”

Section: Synoptic and Mesoscale Environmentmentioning

confidence: 99%

Structure and evolution of line‐shaped convective systems associated with C hangma front during GRL PHONE ‐09: 6 J uly 2009 case

et al. 2013

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This study investigates the structure and evolution of line-shaped convective systems (LCSs) associated with the Changma front observed over Chujado in the southwestern Korean Peninsula by using intensive observational data from upper-air sounding and Doppler radars. LCSs embedded as a multicellular precipitation system developed north of the warm front and persisted for 4 h. With continuous new cells development, the convective cells gradually strengthened and merged into the LCSs and exhibited a high low-level mixing ratio, weak vertical wind shear, and negligible instability. A rear-to-front jet corresponding to a low-level jet (LLJ) was concurrent with a high equivalent potential temperature (θ e ) environmental inflow over the warm front, which suggests that the rear-to-front jet with moist air induced destabilization. Three-dimensional kinematic and reflectivity structures of the LCSs exhibited homogeneous southerly and southwesterly winds with height, small horizontal wind shear, and convergence. Transfer of positive u and v momentum upward by convective eddies into the LCSs and of horizontal momentum occurred through organized convection; both these transfers acted to intensify the LLJ.

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Section: Synoptic and Mesoscale Environmentmentioning

confidence: 99%

Structure and evolution of line‐shaped convective systems associated with C hangma front during GRL PHONE ‐09: 6 J uly 2009 case

et al. 2013

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“…A southwesterly low‐level jet (LLJ) appears over the analysed area at 850 hPa (Figure (b)). The LLJ transports warm moist air from low latitude at low levels and generates convective instability as well as lower the level of free convection (Jeong et al ). In this case, a large amount of moist air is supplied from low latitude by the effect of LLJ.…”

Section: Resultsmentioning

confidence: 78%

“…However, most of dual Doppler radar analyses based on the continuity equation contain several notable deficiencies, including limitation due to the boundary conditions for vertical velocity, spatial interpolation errors, discretizations, uncertainties in radial wind estimates, and non‐simultaneous measurements (Miller and Strauch, ; Ray et al , , ; Gal‐Chen, ; Testud and Chong, ; Chong et al , , ; Ziegler et al , ; Shapiro and Mewes, ). Recently, a variational method has been used to minimize a cost function, defined as distance between the analysis and the observations to produce optimal u , v and w components (Ray et al , ; Sun and Crook, ; Shapiro and Mewes, ; Gao et al , , ; Shimizu and Maesaka, ; Xue et al , ; Lee et al , , You et al , ; Jeong et al , ).…”

Section: Introductionmentioning

confidence: 99%

Radar reflectivity and wind fields analysis by using two X‐band Doppler radars at Okinawa, Japan from 11 to 12 June 2007

Jang

Lee

Jeong

et al. 2013

Meteorological Applications

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During 11 June (CASE I) and 12 June (CASE II) 2007, several meso-β-scale convective systems (MβCSs) were generated along the Meiyu-Baiu front. In this study, the formation, evolution and dissipation of convective precipitation, kinematics structures, and features of the MβCSs developed over ocean were investigate using dual Doppler analysis. The analysis of synoptic conditions and atmospheric sounding suggested that in both cases the atmospheric environment was characterized by well-developed convective systems with warm and humid air-inflow and unstable conditions in addition to strong vertical wind shear at lower levels. In CASE I, an embedded-cell storm developed, approached the area, and moved slowly (≤ 2.5 m s −1 ) northeastward. As the system advanced, strong dominant updraft could be observed at the core. After the system passage, the wind became weak at the centre of the cell, whereas the downdraft area extended up to 4 km in height on the front side. This downdraft flowed back into the convective cell and, maintained the convective activity. The evolution of the updraft and downdraft was in good agreement with the general life cycle of convective systems. In CASE II, line-shaped convective systems (LSCSs) passed from the southwest to east-northeast at 10 m s −1 . The dual Doppler analysis revealed that the wind at the rear of the band contributed to the cells merge and developed into a strong convective cell. In addition, the outflow from the new cell flowed into the rear of a merged convective cell and enhanced the vertical development of the cell.

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“…It suggests that the LLJ can play a role in the development of convection (i.e. Trier et al, 2006;Wang et al, 2012;Jeong et al, 2012Jeong et al, , 2014. The southwesterly LLJ influenced deep convection by enhancing warm advection in the frontal zone.…”

Section: Analysis Results and Discussionmentioning

confidence: 99%

Characteristics of mesoscale-convective-system-produced extreme rainfall over southeastern South Korea: 7 July 2009

Jeong

Lee

Wang

et al. 2016

Nat. Hazards Earth Syst. Sci.

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Abstract. An extreme-rainfall-producing mesoscale convective system (MCS) associated with the Changma front in southeastern South Korea was investigated using observational data. This event recorded historic rainfall and led to devastating flash floods and landslides in the Busan metropolitan area on 7 July 2009. The aim of the present study is to analyse the influences for the synoptic and mesoscale environment, and the reasons that the quasi-stationary MCS causes extreme rainfall. Synoptic and mesoscale analyses indicate that the MCS and heavy rainfall occurred in association with a stationary front which resembled a warm front in structure. A strong southwesterly low-level jet (LLJ) transported warm and humid air and supplied the moisture toward the front, and the air rose upwards above the frontal surface. As the moist air was conditionally unstable, repeated upstream initiation of deep convection by back-building occurred at the coastline, while old cells moved downstream parallel to the convective line with training effect. Because the motion of convective cells nearly opposed the backward propagation, the system as a whole moved slowly. The back-building behaviour was linked to the convectively generated cold pool and its outflow boundary, which played a role in the propagation and maintenance of the rainfall system. As a result, the quasi-stationary MCS caused a prolonged duration of heavy rainfall, leading to extreme rainfall over the Busan metropolitan area.

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Environment and morphology of mesoscale convective systems associated with the Changma front during 9–10 July 2007

Cited by 18 publications

References 37 publications

Structure and evolution of line‐shaped convective systems associated with C hangma front during GRL PHONE ‐09: 6 J uly 2009 case

Structure and evolution of line‐shaped convective systems associated with C hangma front during GRL PHONE ‐09: 6 J uly 2009 case

Radar reflectivity and wind fields analysis by using two X‐band Doppler radars at Okinawa, Japan from 11 to 12 June 2007

Characteristics of mesoscale-convective-system-produced extreme rainfall over southeastern South Korea: 7 July 2009

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