Analysis of Determinants for an Enhanced and Long-lasting Coastal Convective System by Means of a Case Study (26 July 2011)

Lee, Jung-Tae; Lee, Dong‐In; Shimizu, Shingo; You, Cheol‐Hwan

doi:10.1007/s00376-019-9025-x

Cited by 7 publications

(6 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous studies have focused on either the terrain effect (e.g., Li et al 2020) or the impact of the coastline (e.g., Lee et al 2019), but few studies FIG. 4.…”

Section: Evp_50mentioning

confidence: 99%

“…Heavy rainfall is frequently observed near coastal terrain as a result of processes including continuous convection initiation (CI) and upscale convective growth (UCG) (Lin et al 2001;Ducrocq et al 2008;Lee et al 2014;Bai et al 2020a,b). Three important physical setting components influencing CI and UCG at the coast have been identified: ocean, coastline, and coastal mountains.…”

Section: Introductionmentioning

confidence: 99%

“…The sea surface temperature (SST) is found to modulate the intensity but not the location of heavy coastal rainfall (Lebeaupin et al 2006;Part I). Additionally, the coastline provides a surface discontinuity in roughness and temperature and therefore may induce low-level convergence and enhance rainfall in coastal areas (Bergeron 1949;Lee et al 2019). Lee et al (2014) suggested that onshore convection is more profound than offshore convection because of stronger convergence at low levels caused by friction over land.…”

Section: Introductionmentioning

confidence: 99%

“…Xu et al (2012) further stressed the role of topographically trapped cold pools that provide the necessary low-level lifting for secondary CI offshore from the topography for the maintenance of a long-lived, nearly stationary mesoscale convective system (MCS) near the southwest coast of Taiwan. Over the relatively flat terrain of Korea, a sustained heavy rainfall event along the west coast of Korea was caused by a convergence line at the surface induced by the variation in sea-land roughness (Lee et al 2019).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Convection Initiation and Growth at the Coast of South China. Part II: Effects of the Terrain, Coastline, and Cold Pools

Chen

Han

et al. 2020

Monthly Weather Review

View full text Add to dashboard Cite

Through conducting dynamic and thermodynamic diagnoses as well as a series of numerical sensitivity simulations, we investigated the effects of the terrain, coastline, and cold pools on convection initiation (CI) and its subsequent upscale convective growth (UCG) during a case of heavy rainfall along the coast of South China. CI occurred at the vertex of the coastal concave mountain geometry as a combined result of coastal convergence, orographic lifting and mesoscale ascent driven by the terminus of a marine boundary-layer jet (MBLJ). In numerical simulations with the coastline or terrain of South China removed, the coastal CI does not occur or becomes weaker as the MBLJ extends farther north, suggesting that the coastline and terrain play a role in CI. In addition, local small-scale terrain can modulate the detailed location and timing of CI and UCG. When the coastal concave terrain and coastline near the CI are artificially removed or filled by additional mountains, the orographic lifting and the local convergence along the coast correspondingly change, which strongly affects the CI and UCG. From a thermodynamic perspective, the coastal concave terrain plays the role of a local moisture “catcher”, which promotes low-level moistening by blocking water vapor coming from an upstream moist tongue over the ocean. Furthermore, new convection is continuously generated by the lifting of low-level moist southerlies at the leading edges of cold pools that tend to move southeastward because of the blocking coastal mountains. Sensitivity experiments suggest that the MCS becomes weaker and moves more slowly when cold pools are weakened through a reduction of rain-evaporation cooling.

show abstract

“…Previous studies have focused on either the terrain effect (e.g., Li et al 2020) or the impact of the coastline (e.g., Lee et al 2019), but few studies FIG. 4.…”

Section: Evp_50mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Convection Initiation and Growth at the Coast of South China. Part II: Effects of the Terrain, Coastline, and Cold Pools

Chen

Han

et al. 2020

Monthly Weather Review

View full text Add to dashboard Cite

show abstract

“…Lean et al (2009) found that roughness effect was the primary cause for the initial formation of the convergence line which was the key factor in the development of a thunderstorm in southern England. Lee et al (2019) concluded from a case study of coastal precipitation over Korean Peninsula that roughness discontinuity made great contribution to the formation of convergence zone.…”

mentioning

confidence: 99%

Roles of Terrain, Surface Roughness, and Cold Pool Outflows in an Extreme Rainfall Event Over the Coastal Region of South China

Huang

et al. 2021

JGR Atmospheres

View full text Add to dashboard Cite

An extreme rainfall event with maximum 12 hr accumulated rainfall of 464.8 mm associated with a quasi‐stationary mesoscale convective system occurred over the western coastal region of South China in June 2017. An observational analysis shows that early convective storms were initiated near the mountains and moved northeastwards. Moreover, a convergence line between cold northerly winds and warm southerly winds in the lower levels was formed, which favored the development of the quasi‐stationary system. Cold northerly winds were associated with land breeze, downslope winds as well as previous rainfall during earlier period, and cold pool outflows during later period. Cloud‐resolving simulations were performed to examine the roles of terrain, land‐sea surface roughness contrast, and cold pool outflows in the formation of heavy rainfall. Results demonstrate that land‐sea surface roughness contrast and mountains in the middle of Yangjiang and Jiangmen facilitated the formation of the convergence line during earlier period, and cold pool outflows sustained it during later period. Besides orographic lifting, coastal hills helped reduce the stability. Mountains in the middle of Yangjiang hindered the movement of the convective system, without which the associated heavy rainfall would shift farther north. Mt. Tianlu with westward concave morphology played a vital role in the formation of local convergence and the concentration of heavy rainfall. Without it, the total rainfall in the region of interest was reduced. This study suggests the importance of representing processes associated with the complex underlying surface in models for the prediction of heavy rainfall in coastal regions.

show abstract

The role of the Red Sea in moisture feeding of flood events of Iran with emphasis on atmospheric river concept

Esmaeili

Nasr-Esfahani

Ghadim

2022

Meteorol Atmos Phys

View full text Add to dashboard Cite

Analysis of Determinants for an Enhanced and Long-lasting Coastal Convective System by Means of a Case Study (26 July 2011)

Cited by 7 publications

References 48 publications

Convection Initiation and Growth at the Coast of South China. Part II: Effects of the Terrain, Coastline, and Cold Pools

Convection Initiation and Growth at the Coast of South China. Part II: Effects of the Terrain, Coastline, and Cold Pools

Roles of Terrain, Surface Roughness, and Cold Pool Outflows in an Extreme Rainfall Event Over the Coastal Region of South China

The role of the Red Sea in moisture feeding of flood events of Iran with emphasis on atmospheric river concept

Contact Info

Product

Resources

About