Application of Low Frequency of Heavy Precipitation Forecast Weather Map in the Sichuan Basin

2018 ◽  
Vol 08 (03) ◽  
pp. 618-632
Author(s):  
洋 刘
Keyword(s):  
Sichuan Basin ◽  
Low Frequency ◽  
Heavy Precipitation ◽  
Precipitation Forecast ◽  
The Sichuan Basin

scholarly journals Impacts of Convective Activity over the Tibetan Plateau on Plateau Vortex, Southwest Vortex, and Downstream Precipitation

2019 ◽  
Vol 76 (12) ◽  
pp. 3803-3830 ◽  
Author(s):  
Shen-Ming Fu ◽  
Zi Mai ◽  
Jian-Hua Sun ◽  
Wan-Li Li ◽  
Yang Ding ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Potential Vorticity ◽  
Small Proportion ◽  
Geopotential Height ◽  
Sichuan Basin ◽  
Heavy Precipitation ◽  
The Tibetan Plateau ◽  
Convective Activity ◽  
Southwest Vortex ◽  
The Sichuan Basin

Abstract In summer, convective activity over the Tibetan Plateau (TP) is vigorous, with some of it moving eastward and vacating the plateau [defined as the eastward-moving type (EMT)]. Although the EMT only accounts for a small proportion, it is closely related to heavy precipitation east of the TP. This study investigates EMT impacts based on a series of composite semi-idealized simulations and piecewise potential vorticity (PV) inversion. The main results are as follows. (i) An EMT begins to affect downstream precipitation before it vacates the TP. A weaker EMT tends to cause the main downstream rainband to reduce in intensity and move southward. (ii) The EMT contributes to the formation of an eastward-moving plateau vortex (PLV) by enhancing convergence-induced stretching. Over the TP, the PLV mainly enhances/maintains the EMT, whereas during the vacating stage, the PLV dissipates (since convergence decreases rapidly when sensible heating from the TP reduces), which substantially reduces the intensity of the EMT. (iii) After PLV dissipation, a southwest vortex (SWV) forms around the Sichuan basin mainly due to convergence-induced stretching, convection-related tilting, and background transport. Piecewise PV inversion indicates that an EMT can directly contribute to SWV formation via lowering geopotential height and enhancing cyclonic wind perturbations around the Sichuan basin (even before its vacating stage), while neither of them governs the SWV formation. Sensitivity runs show that an EMT is not necessary for SWV formation, but can modify the SWV formation time and location, as well as its displacement, which significantly affects downstream precipitation.

Heat production of sedimentary rocks in the Sichuan basin, Southwest China

2018 ◽  
Vol 52 (5) ◽  
pp. 401-413 ◽  
Author(s):  
Chuanqing Zhu ◽  
Ming Xu ◽  
Nansheng Qiu ◽  
Shengbiao Hu
Keyword(s):  
Heat Production ◽  
Sichuan Basin ◽  
Southwest China ◽  
Sedimentary Rocks ◽  
The Sichuan Basin
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