scholarly journals The quasi-stationary feature of nocturnal precipitation in the Sichuan Basin and the role of the Tibetan Plateau

2012 ◽  
Vol 41 (3-4) ◽  
pp. 977-994 ◽  
Author(s):  
Xia Jin ◽  
Tongwen Wu ◽  
Laurent Li
Keyword(s):  
Tibetan Plateau ◽  
Sichuan Basin ◽  
The Tibetan Plateau ◽  
The Sichuan Basin

scholarly journals The Warming Tibetan Plateau improves winter air quality in the Sichuan Basin, China

2020 ◽  
Author(s):  
Shuyu Zhao ◽  
Tian Feng ◽  
Xuexi Tie ◽  
Zebin Wang
Keyword(s):  
Climate Change ◽  
Air Pollution ◽  
Air Quality ◽  
Tibetan Plateau ◽  
Sichuan Basin ◽  
The Tibetan Plateau ◽  
Aerosol Formation ◽  
Warming Rate ◽  
The Sichuan Basin ◽  
The Impact

Abstract. Impacts of global climate change on the occurrence and development of air pollution have attracted more attentions. This study investigates impacts of the warming Tibetan Plateau on air quality in the Sichuan Basin. Meteorological observations and ERA-interim reanalysis data reveal that the Tibetan Plateau has been rapidly warming during the last 40 years (1979–2017), particularly in winter when the warming rate is approximately twice as much as the annual warming rate. Since 2013, the winter temperature over the plateau has even risen by 2 °C. Here, we use the WRF-CHEM model to assess the impact of the 2 °C warming on air quality in the Sichuan Basin. The model results show that the 2 °C warming causes an increase in the Planetary Boundary Layer (PBL) height and a decrease in the relative humidity (RH) in the basin. The elevated PBL height strengthens vertical diffusion of PM2.5, while the decreased RH significantly reduces secondary aerosol formation. Overall, PM2.5 concentration is reduced by 17.5 % (~ 25.1 μg m−3), of which the reduction in primary and secondary aerosols is 5.4 μg m−3 and 19.7 μg m−3, respectively. These results reveal that the recent warming plateau has improved air quality in the basin, to some certain extent, mitigating the air pollution therein. Nevertheless, climate system is particularly complicated, and more studies are needed to demonstrate the impact of climate change on air quality in the downstream regions as the plateau is likely to continue warming.

Multi-Stage Basin Development and Hydrocarbon Accumulations: A Review of the Sichuan Basin at Eastern Margin of the Tibetan Plateau

2017 ◽  
Vol 29 (2) ◽  
pp. 307-325 ◽  
Author(s):  
Shugen Liu ◽  
Bin Deng ◽  
Luba Jansa ◽  
Zhiwu Li ◽  
Wei Sun ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Sichuan Basin ◽  
The Tibetan Plateau ◽  
Eastern Margin ◽  
Basin Development ◽  
Multi Stage ◽  
The Sichuan Basin

The Role of Diurnal Solenoidal Circulation on Propagating Rainfall Episodes near the Eastern Tibetan Plateau

2010 ◽  
Vol 138 (7) ◽  
pp. 2975-2989 ◽  
Author(s):  
Hsiao-Ling Huang ◽  
Chung-Chieh Wang ◽  
George Tai-Jen Chen ◽  
Richard E. Carbone
Keyword(s):  
Tibetan Plateau ◽  
Weather Research And Forecasting ◽  
The Tibetan Plateau ◽  
Sensitivity Tests ◽  
Westerly Winds ◽  
Thermally Driven ◽  
The Sichuan Basin ◽  
Eastern Edge

Abstract In this case study, numerical simulations using the Weather Research and Forecasting model (WRF) are performed for 3–4 May 2002, in which two propagating rain episodes occurred in successive days with close ties to the terrain of the Tibetan Plateau (TP) in East Asia. Through sensitivity tests, it is found that the eastern TP not only facilitated convective development in the afternoon but that the solenoidal circulation between this region and its leeside lowlands (near the Sichuan basin) also contributed to the longevity and farther downstream propagation of the episodes under prevailing westerly winds. Reversed every 12 h, the thermally driven circulation induced ascending motion near the eastern edge of the TP during daytime but over the leeside at night. The episode propagation in this case, as often observed, was in phase with the ascent, from eastern TP in the afternoon to the lee at night, indicating both enhancing and modulating effects of the solenoidal circulation.

scholarly journals Numerical Study of a Southwest Vortex Rainstorm Process Influenced by the Eastward Movement of Tibetan Plateau Vortex

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Xiaoli Liu ◽  
Endian Ma ◽  
Zhibin Cao ◽  
Shuanglong Jin
Keyword(s):  
Tibetan Plateau ◽  
Sichuan Basin ◽  
Low Pressure ◽  
Ice Crystals ◽  
The Tibetan Plateau ◽  
Pressure System ◽  
Convective Clouds ◽  
Low Pressure System ◽  
Southwest Vortex ◽  
The Sichuan Basin

A number of studies revealed the possible eastward movement of the Tibetan Plateau low-pressure system in summer and indicated the enhancement effect of this process on the southwest vortex in the Sichuan Basin, which can induce strong convective precipitation and flood events in China. In this study, a numerical simulation of a southwest vortex rainstorm process was performed. The results show that the low-pressure system originated from the Tibetan Plateau affects the southwest vortex mainly at the middle level, causing the strength increase of southwest vortex (SWV), and acts as a connection between the positive vorticity centers at the upper and lower layers. For the microscopic cloud structure, the vertical updraft of the cloud cluster embedded in the SWV increases as the low-pressure system from the plateau arrives at the Sichuan Basin. Vapor and liquid cloud water at the lower level are transported upward, based on which the ice cloud at the upper level and the warm cloud at the lower level are joined to create favorable conditions for the growth of ice crystals. As the ice crystals grow up, snow and graupel particles form, which substantially elevates the precipitation. This effect leads to the rapid development of SWV rainstorm clouds and the occurrence of precipitation. In addition to the effect of the plateau vortex, the subsequent merging of the convective clouds is another important factor for heavy rainfall because it also leads to development of convective clouds, causing heavy rainfall.

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.

scholarly journals Block rotation: Tectonic response of the Sichuan basin to the southeastward growth of the Tibetan Plateau along the Xianshuihe‐Xiaojiang fault

Tectonics ◽  
2014 ◽  
Vol 33 (5) ◽  
pp. 686-718 ◽  
Author(s):  
Erchie Wang ◽  
Kai Meng ◽  
Zhe Su ◽  
Qingren Meng ◽  
Jean J. Chu ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Sichuan Basin ◽  
The Tibetan Plateau ◽  
Block Rotation ◽  
The Sichuan Basin ◽  
Xiaojiang Fault

scholarly journals Effects of transport on aerosols over the eastern slope of the Tibetan Plateau: synergistic contribution of Southeast Asia and the Sichuan Basin

2018 ◽  
Vol 11 (5) ◽  
pp. 425-431 ◽  
Author(s):  
Hong-Juan SU ◽  
Jin-Yuan XIN ◽  
Yong-Jing MA ◽  
Zirui LIU ◽  
Tian-Xue WEN ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Southeast Asia ◽  
Sichuan Basin ◽  
The Tibetan Plateau ◽  
Eastern Slope ◽  
The Sichuan Basin
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