scholarly journals Clustering of Floating Tracer Due to Mesoscale Vortex and Submesoscale Fields

2020 ◽  
Vol 47 (3) ◽  
Author(s):  
Dmitry V. Stepanov ◽  
Eugene A. Ryzhov ◽  
Alexei A. Zagumennov ◽  
Pavel Berloff ◽  
Konstantin V. Koshel
Keyword(s):  
Mesoscale Vortex

A study on the dynamic mechanism of the formation of mesoscale vortex in col field

2012 ◽  
Vol 29 (6) ◽  
pp. 1215-1226 ◽  
Author(s):  
Yongqiang Jiang ◽  
Yuan Wang ◽  
Hong Huang
Keyword(s):  
Dynamic Mechanism ◽  
Mesoscale Vortex

Study on the Dynamic Characteristics of an Eastward-offshore Mesoscale Vortex along the Meiyu-Baiu Front

2012 ◽  
Vol 5 (5) ◽  
pp. 360-366 ◽  
Author(s):  
Yu Fei ◽  
Fu Shen-Ming ◽  
Zhao Si-Xiong ◽  
Sun Jian-Hua
Keyword(s):  
Dynamic Characteristics ◽  
Mesoscale Vortex ◽  
Baiu Front

scholarly journals A Spatial Filter Approach to Evaluating the Role of Convection on the Evolution of a Mesoscale Vortex

2013 ◽  
Vol 70 (7) ◽  
pp. 1954-1976 ◽  
Author(s):  
Glenn A. Creighton ◽  
Robert E. Hart ◽  
Philip Cunningham
Keyword(s):  
Three Dimensional ◽  
Spatial Separation ◽  
Spatial Filter ◽  
Tropical Cyclogenesis ◽  
Moist Convection ◽  
Mesoscale Vortex ◽  
Convective Scale ◽  
Vortical Hot Towers ◽  
Order Of Magnitude ◽  
Deep Moist Convection

Abstract A new spatial filter is proposed that exploits a spectral gap in power between the convective scale and the system (“vortex”) scale during tropical cyclone (TC) genesis simulations. Using this spatial separation, this study analyzes idealized three-dimensional numerical simulations of deep moist convection in the presence of a symmetric midlevel vortex to quantify and understand the energy cascade between the objectively defined convective scale and system scale during the early stages of tropical cyclogenesis. The simulations neglect surface momentum, heat, and moisture fluxes to focus on generation and enhancement of vorticity within the interior to more completely close off the energy budget and to be consistent for comparison with prior benchmark studies of modeled TC genesis. The primary contribution to system-scale intensification comes from the convergence of convective-scale vorticity that is supplied by vortical hot towers (VHTs). They contribute more than the convergence of system-scale vorticity to the spinup of vorticity in these simulations by an order of magnitude. Analysis of the change of circulation with time shows an initial strengthening of the surface vortex, closely followed by a growth of the mid- to upper-level circulation. This evolution precludes any possibility of a stratiform precipitation–induced top-down mechanism as the primary contributor to system-scale spinup in this simulation. Instead, an upscale cascade of rotational kinetic energy during vortex mergers is responsible for spinup of the simulated mesoscale vortex. The spatial filter employed herein offers an alternative approach to the traditional symmetry–asymmetry paradigm, acknowledges the highly asymmetric evolution of the system-scale vortex itself, and may prove useful to future studies on TC genesis.

scholarly journals Probabilistic Evaluation of Tibetan Plateau Mesoscale Vortex on 18 July 2013

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Haiwen Liu ◽  
Kaijun Wu ◽  
Mengxing Du ◽  
Ning Fu
Keyword(s):  
Tibetan Plateau ◽  
Heavy Rainfall ◽  
Western Pacific Subtropical High ◽  
Initial Time ◽  
Baikal Lake ◽  
Mesoscale Vortex ◽  
Weather Forecasts ◽  
Probabilistic Evaluation ◽  
The Sichuan Basin

Tibetan Plateau (TP) mesoscale vortex (TPMV) was regarded as one of the most important rain bearing systems in China. Previous studies focused on the mechanisms of the TPMV in the viewpoint of deterministic forecast; however, few studies investigate the predictability of the TPMV using the Observing System Research and Predictability Experiment (THORPEX) Interactive Grand Global Ensemble (TIGGE) from the European Center for Medium Range Weather Forecasts (ECWMF). This paper investigates the location and the intensity of the larger-scale synoptic systems that influenced the development of the TPMV and its associated heavy rainfall by correlation and composite analysis. The case study on 18 July 2013 shows that stronger Balkhash Lake ridge, weaker Baikal Lake trough, and weaker western Pacific subtropical high (WPSH) are favorable to formation of TPMV over the Sichuan basin (SCB); otherwise, weaker Balkhash Lake ridge, stronger Baikal Lake trough, and stronger WPSH result in formation of TPMV to west of the SCB slightly. After the initial time, forecast for next 48 h of the geopotential height over the SCB can be viewed as a precursor of the subsequent time-averaged 90–108 h forecast of TPMV. TPMV had critical contributions to the heavy rainfall over the SCB on 18 July 2013.

scholarly journals Formation of a kind of heavy‐precipitation‐producing mesoscale vortex around the Sichuan Basin: An along‐track vorticity budget analysis

2020 ◽  
Vol 21 (1) ◽  
Author(s):  
Shuang‐Lei Feng ◽  
Shuang‐Long Jin ◽  
Shen‐Ming Fu ◽  
Jian‐Hua Sun ◽  
Yuan‐Chun Zhang
Keyword(s):  
Sichuan Basin ◽  
Heavy Precipitation ◽  
Mesoscale Vortex ◽  
Budget Analysis ◽  
Vorticity Budget ◽  
The Sichuan Basin ◽  
Along Track
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