|Table of Contents|

Low-frequency Characteristics of Silk-road and East Asia-Pacific Patterns and Their Effects on Summer Precipitation in Jianghuai River Basin, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2023年第06期
Page:
1341-1354
Research Field:
环境与可持续发展
Publishing date:

Info

Title:
Low-frequency Characteristics of Silk-road and East Asia-Pacific Patterns and Their Effects on Summer Precipitation in Jianghuai River Basin, China
Author(s):
GUO Zi-wei1; 2; 3; 4;  WANG Li-juan1; 2; 3*;  LIU Dan-ling1; 2; 3
(1. Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China; 2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China; 3. Joint International Research Laboratory of Climate and Environment Change, Nanjing University of Information Science & Technology, Nanjing 210044, Jiangsu, China; 4. Henan Meteorological Observatory, Zhengzhou 450003, Henan, China)
Keywords:
atmospheric teleconnection;  summer precipitation;  low-frequency filtering;  SR pattern;  EAP pattern;  western Pacific subtropical high;  Jianghuai River Basin
PACS:
P466
DOI:
10.19814/j.jese.2023.05040
Abstract:
The summer flood disaster in Jianghuai River Basin(JRB)is mainly due to the stable maintenance of abnormal atmospheric circulation. The influence mechanism of low-frequency oscillations and their synergistic changes on summer precipitation in JRB is one of the hot issues in the field of atmospheric science. Based on the daily reanalysis data of ERA5 and daily station precipitation data provided by China Meteorological Administration, the low-frequency characteristics of silk-road(SR)and East Asia-Pacific(EAP)patterns, and their influence mechanism on summer precipitation in JRB were analyzed. The results show that the low-frequency periods of 10-30 d of SR and EAP patterns are closely related to the summer precipitation in JRB. The low-frequency systems of SR and EAP patterns have undergone positive and negative phase conversion and gradually reach the peak(valley)phase. The main results are as follows: ① The 10-30 d low-frequency meridional winds at the isobaric surface of 200 hPa present alternating distribution of northerly and southerly winds along the westerly jet; when SR pattern reaches the peak of negative phase, JRB is controlled by the northerly wind, and the low-frequency cyclone in the middle latitude is strengthened, accelerating the westerly jet. ② Western Pacific subtropical high(WPSH)and South Asian high(SAH)have a low-frequency scale of 10-30 d; the two low-frequency highs move towards each other and overlap in JRB at the peak phase, which is in favor of persistent precipitation. ③ The anomalous outgoing longwave radiation(OLR)wave train moving northwest from East Asia also shows a significant low-frequency oscillation characteristic of 10-30 d; when it is in the peak phase, OLR is a negative anomaly in JRB, which is conducive to the precipitation. ④ The configuration of positive vorticity at lower level and negative vorticity at upper level with a low-frequency scale of 10-30 d is in favor of convergence at lower level and divergence at upper level, which leads to the enhancement of upward motion and triggers precipitation in JRB.

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Last Update: 2023-12-01