Spatiotemporal Characteristics and Associated Synoptic Patterns of Extremely Persistent Heavy Rainfall in Southern China

2021 ◽  
Vol 126 (1) ◽  
Author(s):  
Chi Zhang ◽  
Xiaogang Huang ◽  
Jianfang Fei ◽  
Xia Luo ◽  
Yan Zhou
Keyword(s):  
Heavy Rainfall ◽  
Southern China ◽  
Synoptic Patterns ◽  
Spatiotemporal Characteristics ◽  
Persistent Heavy Rainfall

Identification of typical synoptic patterns causing heavy rainfall in the rainy season in Japan by a Self-Organizing Map

2007 ◽  
Vol 83 (2-4) ◽  
pp. 185-200 ◽  
Author(s):  
Koji Nishiyama ◽  
Shinichi Endo ◽  
Kenji Jinno ◽  
Cintia Bertacchi Uvo ◽  
Jonas Olsson ◽  
...  
Keyword(s):  
Rainy Season ◽  
Heavy Rainfall ◽  
Self Organizing Map ◽  
Synoptic Patterns ◽  
Self Organizing

scholarly journals On the Scale Interactions that Dominate the Maintenance of a Persistent Heavy Rainfall Event: A Piecewise Energy Analysis

2018 ◽  
Vol 75 (3) ◽  
pp. 907-925 ◽  
Author(s):  
Shen-Ming Fu ◽  
Rui-Xin Liu ◽  
Jian-Hua Sun
Keyword(s):  
Heavy Rainfall ◽  
Lower Troposphere ◽  
Heavy Rainfall Event ◽  
Scale Interactions ◽  
Leading Role ◽  
Multiscale Systems ◽  
Persistent Heavy Rainfall ◽  
Eddy Flow ◽  
Heavy Rainfall Events ◽  
Separation Results

Abstract Persistent heavy rainfall events (PHREs) are the product of the combined effects of multiscale systems. A PHRE that occurred during the 2016 mei-yu season was selected to further the understanding of the scale interactions accounting for the persistence of this type of event. The scale interactions were analyzed quantitatively using a piecewise energy budget based on temporal scale separation. Results show that the strongest interactions between the precipitation-related eddy flow and its background circulation (BC) occur in the mid- to lower troposphere, where a significant downscale kinetic energy (KE) cascade alone dominates eddy flow persistence. An obvious upscale KE cascade (i.e., a feedback effect) appears in the mid- to upper troposphere but has a negligible effect on the BC. Overall, within the precipitation region, the downscale KE cascade is primarily dependent on BC signals with shorter periods, whereas the upscale KE cascade is more dependent on BC signals with longer periods. Thus, the BC has asymmetric effects on the KE cascades. The most significant BC signal as determined via wavelet analysis [i.e., quasi-biweekly (10–18 days) oscillations in this event] does not play the leading role in the downscale KE cascade. Instead, the quasi-weekly oscillations provide the maximum amount of energy for eddy flow maintenance. Semi-idealized simulations of various BC signals show similar results: precipitation and the intensities of lower-level shear lines and transversal troughs (both of which are closely related to the precipitation-related eddy flow) are more sensitive to the quasi-weekly oscillation than to the quasi-biweekly oscillation.

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