Diagnostic Analysis on a Heavy Rainfall Associated with the Northeast Cold Vortex and Atmospheric River

SUN Yingshu; WANG Yongqing; SHEN Xinyong; ZHOU Yushu; DENG Guo

doi:10.7522/j.issn.1000-0534.2018.00005

Plateau Meteorology >

2018 , Vol. 37 >Issue 4: 970 - 980

DOI: https://doi.org/10.7522/j.issn.1000-0534.2018.00005

Diagnostic Analysis on a Heavy Rainfall Associated with the Northeast Cold Vortex and Atmospheric River

SUN Yingshu ,
WANG Yongqing ,
SHEN Xinyong ,
ZHOU Yushu ,
DENG Guo

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Key Laboratory of Meteorological Disaster, Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044, Jiangsu, China;Key Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;University of Chinese Academy of Sciences, Beijing 100049, China;National Meteorological Center, Beijing 100029, China

Received date: 2017-09-08

Online published: 2018-08-28

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Abstract

Based on the FNL reanalysis and HYSPLIT model driven by NCEP GDAS data, this study examined a heavy rainfall associated with the northeast cold vortex (NECV) and atmospheric rivers (ARs) over the northeast China occurred on July 25, 2016. The results indicated that the heavy rainfall occurred in a favorable synoptic pattern, NECV, the Okhotsk blocking high, the low at the east of Japan, upper-and low-level jet played important roles in the process. There were two ARs that both originated from the Western Pacific and coupled with deep wet layers during this event. However, one of the two ARs flowed northward to the northeast China through the East China sea and the Yellow Sea and the other flowed northeastward through the South China Sea with considerable moisture. ARs provided favorable moisture condition for the heavy rainfall by entraining abundant moisture from tropical regions to mid-latitudes directly. The convergence of moist air from tropical origin and dry air from the circulation of NECV induced intense ascending motions in surrounding regions, which was the main dynamic uplift mechanism of the intense rainfall. Analysis of the trajectory tracking reveals that the most significant moisture sources of the heavy rainfall were the Western Pacific, the South China Sea, the Bay of Bengal and the Eurasia. Furthermore, the moisture within the lower and middle troposphere was mainly transported by the south atmospheric river and the southwest atmospheric river separately.

Key words： Northeast clod vorte; atmospheric river; heavy rainfall; trajectory tracking

Cite this article

SUN Yingshu , WANG Yongqing , SHEN Xinyong , ZHOU Yushu , DENG Guo . Diagnostic Analysis on a Heavy Rainfall Associated with the Northeast Cold Vortex and Atmospheric River[J]. Plateau Meteorology, 2018 , 37(4) : 970 -980 . DOI: 10.7522/j.issn.1000-0534.2018.00005

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