TY - JOUR
T1 - Radar-observed diurnal cycle and propagation of convection over the pearl river delta during Mei-Yu season
AU - Chen, Xingchao
AU - Zhao, Kun
AU - Xue, Ming
AU - Zhou, Bowen
AU - Huang, Xuanxuan
AU - Xu, Weixin
N1 - Funding Information:
This work was primarily supported the National Basic Research Program of China (973 program; 2013CB430101) and Special Fund for Public Welfare Industry (Meteorology) of China (GYHY201006007), the National Natural Science Foundation of China (grants 41275031 and 41322032), and Program for New Century Excellent Talents in University of China. Observational data used in this study were collected by the National Basic Research Program of China (973 program; 2013CB430101). Special requests for the data can be made at http://scw973.nju.edu.cn/ or contacting the project office at yang.zhengwei@nju.edu.cn. After 2018, the data of this paper will be uploaded to http://www.nersc.gov/users/science-gate-ways/ for public sharing. We also thank the Editor and three anonymous reviewers for their valuable suggestions that improved our paper.
Publisher Copyright:
© 2015. American Geophysical Union. All Rights Reserved.
PY - 2015/12/27
Y1 - 2015/12/27
N2 - Using operational Doppler radar and regional reanalysis data from2007-2009, the climatology and physical mechanisms of the diurnal cycle and propagation of convection over the Pearl River Delta (PRD) region of China during the Mei-Yu seasons are investigated. Analyses reveal two hot spots for convection: one along the south coastline of PRD and the other on the windward slope of mountains in the northeastern part of PRD. Overall, convection occurs most frequently during the afternoon over PRD due to solar heating. On the windward slope of the mountains, convection occurrence frequency exhibits two daily peaks, with the primary peak in the afternoon and the secondary peak from midnight to early morning. The nighttime peak is shown to be closely related to the nocturnal acceleration and enhanced lifting on the windward slope of southwesterly boundary layer flow, in the form of boundary layer low-level jet. Along the coastline, nighttime convection is induced by the convergence between the prevailing onshore wind and the thermally induced land breeze in the early morning. Convection on the windward slope of the mountainous area is more or less stationary. Convection initiated near the coastline along the land breeze front tends to propagate inland from early morning to early afternoon when land breeze cedes to sea breeze and the prevailing onshore flow.
AB - Using operational Doppler radar and regional reanalysis data from2007-2009, the climatology and physical mechanisms of the diurnal cycle and propagation of convection over the Pearl River Delta (PRD) region of China during the Mei-Yu seasons are investigated. Analyses reveal two hot spots for convection: one along the south coastline of PRD and the other on the windward slope of mountains in the northeastern part of PRD. Overall, convection occurs most frequently during the afternoon over PRD due to solar heating. On the windward slope of the mountains, convection occurrence frequency exhibits two daily peaks, with the primary peak in the afternoon and the secondary peak from midnight to early morning. The nighttime peak is shown to be closely related to the nocturnal acceleration and enhanced lifting on the windward slope of southwesterly boundary layer flow, in the form of boundary layer low-level jet. Along the coastline, nighttime convection is induced by the convergence between the prevailing onshore wind and the thermally induced land breeze in the early morning. Convection on the windward slope of the mountainous area is more or less stationary. Convection initiated near the coastline along the land breeze front tends to propagate inland from early morning to early afternoon when land breeze cedes to sea breeze and the prevailing onshore flow.
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U2 - 10.1002/2015JD023872
DO - 10.1002/2015JD023872
M3 - Article
AN - SCOPUS:84957440124
SN - 0148-0227
VL - 120
SP - 12,557-12,575
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
IS - 24
ER -