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- Title
Diurnal Variations of Presummer Rainfall over Southern China.
- Authors
ZHINA JIANG; DA-LIN ZHANG; RUDI XIA; TINGTING QIAN
- Abstract
In this study, the presummer diurnal cycle of rainfall (DCR) over southern China is examined using the merged 0.1°-resolution gridded hourly rain gauge and satellite rainfall dataset and the National Centers for Environmental Prediction Final Global Analysis during April to June of 2008-2015. Results show pronounced diurnal variations in rainfall amount, frequency, and intensity over southern China, with substantially different amplitudes from southwestern to southeastern China, and from the pre- to postmonsoon-onset period. Southwestern China often encounters significant noctumal-to-morning rainfall under the influence of enhanced nocturnal low-level southwesterly winds. Southeastern China is dominated by afternoon rainfall as a result of surface healing, likely aided by local topographical lifting. Both the pre- and postmonsoon-onset periods exhibit two diurnal rainfall peaks: one in the early morning and the other in the late afternoon. But the latter shows the two peaks with nearly equal amplitude whereas the former displays a much larger early morning peak than that in the late afternoon. Three propagating modes accounting for the presummer DCR are found: (i) an eastward- or southeastward-propagating mode occurs mostly over southwestern China that is associated with enhanced transport of warm and moist air from tropical origin and the induced low-level convergence, (ii) a quasi-stationary mode over southeastern China appears locally in the warm sector with weak-gradient flows, and (iii) an inlandpropagating mode occurs during the daytime in association with sea breezes along the southern coastal regions, especially evident throughout the postmonsoon-onset period.
- Subjects
DIURNAL atmospheric pressure variations; RAINFALL anomalies; RAINFALL frequencies; GRADIENT winds; SEA breeze; PLANT propagation
- Publication
Journal of Climate, 2017, Vol 30, Issue 2, p755
- ISSN
0894-8755
- Publication type
Article
- DOI
10.1175/JCLI-D-15-0666.1