A numerical investigation of the convective systems in the vicinity of southern Taiwan associated with Typhoon Fanapi (2010): Formation mechanism of double rainfall peaks

2016 ◽  
Vol 121 (21) ◽  
pp. 12,647-12,676 ◽  
Author(s):  
Ching‐Yuang Huang ◽  
I‐Hsin Wu ◽  
Lei Feng
Keyword(s):  
Numerical Investigation ◽  
Formation Mechanism ◽  
Convective Systems ◽  
Southern Taiwan

Slug formation mechanism for air–water system in T-junction microchannel: a numerical investigation

2018 ◽  
Vol 72 (11) ◽  
pp. 2921-2932 ◽  
Author(s):  
Wasim Khan ◽  
A. K. Chandra ◽  
K. Kishor ◽  
Sadhana Sachan ◽  
M. Siraj Alam
Keyword(s):  
Numerical Investigation ◽  
Formation Mechanism ◽  
Water System

scholarly journals A Diagnostic Case Study of Mei-Yu Frontal Retreat and Associated Low Development near Taiwan

2016 ◽  
Vol 144 (6) ◽  
pp. 2327-2349 ◽  
Author(s):  
Chung-Chieh Wang ◽  
George Tai-Jen Chen ◽  
Kuok-Hou Ho
Keyword(s):  
Northern South China Sea ◽  
Cold Side ◽  
Weather Forecasts ◽  
Convective Systems ◽  
Physical Mechanisms ◽  
Medium Range ◽  
Mesoscale Convective ◽  
Southern Taiwan ◽  
Second Period

Abstract After advancing southward across Taiwan and becoming quasi stationary, a mei-yu front moved north again and led to a second period of significant rainfall during 13–14 June 2012. Associated with this frontal retreat, a meso-α-scale low pressure developed to the southwest of Taiwan, in the proximity of organized mesoscale convective systems (MCSs) along and south of the front over the northern South China Sea. In this study, using mainly the European Centre for Medium-Range Weather Forecasts gridded analyses, the physical mechanisms of this frontal retreat are investigated and diagnosed, with a focus on the initial retreat and the role played by the deepening frontal low. The diagnoses employing the vorticity equation and frontogenetical function both indicate that the appearance of southerly winds, and thus the retrogression of cold air north of the front was the cause of the initial frontal retreat, consistent with earlier studies. The potential vorticity diagnosis using the piecewise inversion technique further confirms that the deepening low over the southern Taiwan Strait provided the southerly winds east of Taiwan where the retreat started, while the low itself intensified in response to the persistent latent heating by the active and organized MCSs. Thus, the northerly winds on the cold side of the front near Taiwan were replaced by southerly winds, and the mei-yu front in the present case retreated and essentially became a warm front. While mei-yu frontal retreats near Taiwan are more frequent than previously recognized, the present case was the most significant event in three seasons during 2012–14.

scholarly journals Employment of MM5 in simulating MCSs developed in and around Bangladesh

MAUSAM ◽  
2021 ◽  
Vol 60 (2) ◽  
pp. 137-146
Author(s):  
NASREEN AKTER ◽  
MD. NAZRUL ISLAM
Keyword(s):  
Formation Mechanism ◽  
Mesoscale Model ◽  
Propagation Speed ◽  
Tropical Rainfall Measuring Mission ◽  
Cumulus Parameterization ◽  
Monsoon Period ◽  
Tropical Zone ◽  
Convective Systems ◽  
Rain Gauges ◽  
Mesoscale Convective

The Mesoscale Convective Systems (MCSs) produce numerous weather hazards with their variety of forms. The formation mechanism of MCSs is thus important to know for Bangladesh and its surroundings, because this region is one of the heaviest rainfall areas in the tropical zone. The meteorologists are studying and analyzing the formation mechanism of different types of MCSs using radar and satellite observations data. Observations are limited to real time, but for planning purposes projected parameters over a certain period obtained from a mesoscale model is the requirement. Consequently, the motivation of this paper is to obtain the evolution and life cycle of MCSs developed in and around Bangladesh during pre-monsoon period through the simulation by a mesoscale model named MM5. In this work the calibration of MM5 model for different cumulus parameterization has been performed during the pre-monsoon period of this region. In the present study two domains with mesh resolutions 45 km × 45 km and 15 km × 15 km are prepared. MM5 runs using different cumulus parameterizations are carried out for sensitivity test. The precipitation simulated by the model are compared structurally and numerically with that of Tropical Rainfall Measuring Mission (TRMM) data products, available data from radar scan and observed rain-gauges rainfall in Bangladesh. Important features like lifetime, maintenance mechanism, traversed path, propagation speed and direction of MCSs developed during pre-monsoon period of 2002 in and around Bangladesh have been pointed out.

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