首页|The Short-Duration Heavy Rainfall in Different Quadrants of Northeast China Cold Vortices

The Short-Duration Heavy Rainfall in Different Quadrants of Northeast China Cold Vortices

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  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
The Northeast China cold vortex(NCCV)is one of the main synoptic-scale systems causing short-duration heavy rainfall(SDHR)in Northeast China.Environmental conditions(e.g.,water vapor,instability,and vertical wind shear)are known to be distinctly different over the four quadrants of NCCVs,rendering prediction of the SDHR related to NCCVs(NCCV_SDHR)more challenging.Based on 5-yr hourly rainfall observations from 3196 automatic weather stations and ERA5 reanalysis data,10,232 NCCV_SDHR events were identified and divided into four quadrant groups according to their relative position to the center of the NCCV(CVC).The results show that the southeast quadrant features the highest frequency of SDHR,with stronger intensity,longer duration,and wider coverage;and the SDHR in different quadrants presents different formation mechanisms and varied temporal evolution.A new co-ordinate system is established relative to the CVC that uses the CVC as the origin and the radius of the NCCV(rCV)as the unit distance.In this new coordinate system,all of the NCCV_SDHR events in the 5-yr study period are syn-thesized.It is found that the occurrence frequency of NCCV_SDHR initially increases and then decreases with in-creasing distance from the CVC.The highest frequency occurs mainly between 0.8 and 2.5 times rCV from the CVC in the southeast quadrant.This can be attributed to the favorable conditions,such as convergence of the low-level shear line and abundant water vapor,which are concentrated in this region.Furthermore,high-frequency NCCV_SDHR larger than 50 mm(NCCV_SDHR50)is observed to be closer to the CVC.When NCCV_SDHR50 occurs,the NCCV is in closer proximity to the subtropical high,resulting in stronger low-level convergence and more abundant water vapor.Additionally,there are lower lifting condensation levels and stronger 0-6-and 0-1-km vertical wind shears in these environments.These findings provide a valuable reference for more accurate prediction ofNCCV SDHR.

Northeast China cold vortexshort-duration heavy rainfallstatistical characteristicsenvironmental con-ditions

Lei YANG、Yongguang ZHENG

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Liaoning Meteorological Disaster Monitoring and Early Warning Center,Shenyang 110166

China Meteorological Administration Tornado Key Laboratory,Foshan 528315

National Meteorological Centre,China Meteorological Administration,Beijing 100081

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Meteorological Administration Special Innovation and Development ProgramChina Meteorological Administration Special Innovation and Development ProgramChina Meteorological Administration Special Innovation and Development ProgramChina Meteorological Administration Special Innovation and Development ProgramChina Meteorological Administration Key Innovation Team FundChina Meteorological Administration Youth Innovation Team FundResearch Project of the Chinese Academy of Meteorological Sciences

4217501742305013CXFZ2022J059CXFZ2022J003CXFZ2023J013CXFZ2024J021CMA2022ZD07CMA2024QN052023Z019

2024

10.1007/s13351-024-3055-8

气象学报(英文版)
中国气象学会

气象学报(英文版)

CSTPCD
影响因子：0.57
ISSN：0894-0525
年,卷(期)：2024.38(2)
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