首页|A 10-yr Rainfall and Cloud-to-Ground Lightning Climatology over Coastal and Inland Regions of Guangdong,China during the Pre-Summer Rainy Season

A 10-yr Rainfall and Cloud-to-Ground Lightning Climatology over Coastal and Inland Regions of Guangdong,China during the Pre-Summer Rainy Season

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  • 国家科技期刊平台
  • NETL
  • NSTL
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A comparative analysis of the spatiotemporal distribution characteristics of rainfall and lightning in coastal and in-land areas of Guangdong Province of China during the pre-summer rainy season(PSRS)from 2008 to 2017 reveals distinct patterns.In the inland target region(ITR),rainfall is concentrated in the central and eastern mountainous areas.It exhibits a bimodal diurnal variation,with peaks in the afternoon and morning.The afternoon peak becomes more pronounced during the post-monsoon-onset period because of the increased rainfall frequency.Similarly,in the coastal target region(CTR),rainfall concentrates around mountainous peripheries.However,CTR's rainfall is weaker than ITR's during the pre-monsoon-onset period,primarily associated with the lower-level moisture outflow in CTR,but it strengthens significantly during the post-monsoon-onset period owing to enhanced moisture inflow.CTR's di-urnal rainfall variation transitions from bimodal to a single broad peak during the post-monsoon-onset period,influ-enced by changes in both rainfall frequency and intensity.In contrast to rainfall,the spatiotemporal distribution of lightning centers remains relatively stable during the PSRS.The strongest center is located over ITR's plains west of the rainfall center,with a secondary center in the western plains of CTR.Lightning activity significantly increases during the post-monsoon-onset period,particularly in ITR,primarily because of the increased lightning hours.The di-urnal lightning flash density and lightning hours show a single afternoon peak in the two target regions,and the tim-ing of the peak in ITR is approximately two hours later than in CTR.Composite circulation analysis indicates that during early morning,the lower atmosphere is nearly neutral in stratification.The advected warm,moist,unstable air-flow,combined with topography,favors convection initiation.In the afternoon,solar radiation increases thermal in-stability,further enhancing the convection frequency and intensity.Improved moisture and thermal conditions con-tribute to an increase in rainfall and lightning during the post-monsoon-onset period.Moreover,the occurrence of lightning is found to be closely linked to the most unstable convective available potential energy,low-level vertical wind shear,and updraft intensity.

rainfalllightningspatiotemporal distributiondiurnal variationpre-summer rainy season

Yuqing RUAN、Rudi XIA、Xinghua BAO、Dong ZHENG、Yan SHEN、Jinfang YIN

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State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,China Meteorological Administration,Beijing 100081

Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science & Technology,Nanjing 210044

National Meteorological Information Centre,China Meteorological Administration,Beijing 100081

Natural Science Foundation of BeijingNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaBasic Research Fund of Chinese Academy of Meteorological SciencesBasic Research Fund of Chinese Academy of Meteorological SciencesNatural Science Foundation of Gansu Province,China

82220792022YFC3003903420750832023Z0082023Z00121JR7RA697

2024

10.1007/s13351-024-3161-7

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(3)