| Autor: |
Ruotong YAN, Dongbei XU, Jisong SUN, Zhening MAI, Bingsong CHANG, Yihan DING |
| Jazyk: |
čínština |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Gaoyuan qixiang, Vol 42, Iss 3, Pp 701-710 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1000-0534 |
| DOI: |
10.7522/j.issn.1000-0534.2022.00090 |
| Popis: |
Using ERA5 （0.25°×0.25°） hourly reanalysis data， TRMM satellite precipitation data and FY-2E satellite black-body temperature （TBB） data， the circulation background and movement characteristics of the formation and development of a Qinghai-Xizang Plateau vortex （QXPV） moving out of the Tibetan Plateau from July 7 to July 9， 2017， as well as the dynamical and thermal mechanism of the heavy precipitation in the Yangtze-Huaihe River Basin were discussed， and the HYSPLIT4 model was used to track the water vapor source of the heavy precipitation in the Yangtze-Huaihe River Basin.The results show as follow： The QXPV was generated in the central part of the Tibetan Plateau， first moved to the southeast and then to the northeast after reaching the central part of Sichuan， with the life history of 39 h.At 200 hPa， the South Asian High and the upper-level jet stream were strong， and the vortex was located in the divergence region on the right side of the upper-level jet inlet area， which promoted the formation and development of the QXPV.The negative height center in the front of the vortex and the southwest airflow at the edge of the West Pacific Subtropical High lead the eastward movement and turn of the QXPV at 500 hPa.After the QXPV moved out of the Qinghai-Xizang Plateau， it was in the decompression area caused by positive vorticity advection in front of the high trough.In addition， the leeward slope of the large terrain was conducive to the enhancement of cyclonic vorticity， so the QXPV developed.The QXPV moved along the Yangtze-Huaihe shear line after it moved out of the Tibetan Plateau， and the cold air behind the trough merged with the southerly airflow carrying water vapor from the Bay of Bengal and the South China Sea.Under the action of frontogenesis， the QXPV developed into a Yangtze-Huaihe cyclone， and the rainfall rapidly increased to the standard of heavy rain.The coupling of upper-level jet and low-level jet， and the development of low-level convective instability strengthened the dynamic uplift， which was conducive to the formation of heavy precipitation over the Yangtze-Huaihe River Basin.The water vapor source of heavy precipitation was mainly the South China Sea and the Bay of Bengal.The convergence upward movement was the strongest during the period of the strongest precipitation， and the convective clouds developed vigorously to maintain the precipitation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
