Abstract
Diurnal convection (DC), which is characterized by rainy days with maximum rainfall during the afternoon without strong synoptic disturbances, is the most frequently observed weather system that affects local rainfall in Taiwan. In this study, we investigate the impact of boreal summer intra-seasonal oscillations (BSISOs) on the modulation of warm season (May–September) DC activities in Taiwan. Our analyses focus on (1) identifying the relationships between changes in DC characteristics (e.g. DC days and the mean rainfall intensities on DC days) and the phase evolutions of two types of BSISOs (including the 30–60-day ISO named BSISO1 and the 10–30-day ISO named BSISO2) and (2) the related maintenance mechanisms. Analyses of DC days demonstrate that the contribution of DC days to the total quantity of rainy days in Taiwan generally reaches a maximum value when Taiwan is being modulated by intensified southwesterly winds, intensified local sea breeze circulations, and intensified local thermal instabilities (i.e. phase 3 of BSISO1 and phase 7 of BSISO2). Analyses of the mean rainfall intensities on DC days show that maximum values are generally reached when the moisture convergence line propagates northwards over Taiwan (i.e. phase 1 of BSISO1 and phase 3 of BSISO2). Further examinations indicate that the abovementioned findings are not dependent upon the strengths of the BSISOs.
| Original language | English |
|---|---|
| Pages (from-to) | 2187-2200 |
| Number of pages | 14 |
| Journal | International Journal of Climatology |
| Volume | 38 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - 2018 Apr 1 |
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Keywords
- diurnal convection
- East Asia
- intra-seasonal oscillation
ASJC Scopus subject areas
- Atmospheric Science
Cite this
Impact of boreal summer intra-seasonal oscillations on warm season diurnal convection activity in Taiwan. / Huang, Wan Ru; Chang, Ya Hui.
In: International Journal of Climatology, Vol. 38, No. 5, 01.04.2018, p. 2187-2200.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Impact of boreal summer intra-seasonal oscillations on warm season diurnal convection activity in Taiwan
AU - Huang, Wan Ru
AU - Chang, Ya Hui
PY - 2018/4/1
Y1 - 2018/4/1
N2 - Diurnal convection (DC), which is characterized by rainy days with maximum rainfall during the afternoon without strong synoptic disturbances, is the most frequently observed weather system that affects local rainfall in Taiwan. In this study, we investigate the impact of boreal summer intra-seasonal oscillations (BSISOs) on the modulation of warm season (May–September) DC activities in Taiwan. Our analyses focus on (1) identifying the relationships between changes in DC characteristics (e.g. DC days and the mean rainfall intensities on DC days) and the phase evolutions of two types of BSISOs (including the 30–60-day ISO named BSISO1 and the 10–30-day ISO named BSISO2) and (2) the related maintenance mechanisms. Analyses of DC days demonstrate that the contribution of DC days to the total quantity of rainy days in Taiwan generally reaches a maximum value when Taiwan is being modulated by intensified southwesterly winds, intensified local sea breeze circulations, and intensified local thermal instabilities (i.e. phase 3 of BSISO1 and phase 7 of BSISO2). Analyses of the mean rainfall intensities on DC days show that maximum values are generally reached when the moisture convergence line propagates northwards over Taiwan (i.e. phase 1 of BSISO1 and phase 3 of BSISO2). Further examinations indicate that the abovementioned findings are not dependent upon the strengths of the BSISOs.
AB - Diurnal convection (DC), which is characterized by rainy days with maximum rainfall during the afternoon without strong synoptic disturbances, is the most frequently observed weather system that affects local rainfall in Taiwan. In this study, we investigate the impact of boreal summer intra-seasonal oscillations (BSISOs) on the modulation of warm season (May–September) DC activities in Taiwan. Our analyses focus on (1) identifying the relationships between changes in DC characteristics (e.g. DC days and the mean rainfall intensities on DC days) and the phase evolutions of two types of BSISOs (including the 30–60-day ISO named BSISO1 and the 10–30-day ISO named BSISO2) and (2) the related maintenance mechanisms. Analyses of DC days demonstrate that the contribution of DC days to the total quantity of rainy days in Taiwan generally reaches a maximum value when Taiwan is being modulated by intensified southwesterly winds, intensified local sea breeze circulations, and intensified local thermal instabilities (i.e. phase 3 of BSISO1 and phase 7 of BSISO2). Analyses of the mean rainfall intensities on DC days show that maximum values are generally reached when the moisture convergence line propagates northwards over Taiwan (i.e. phase 1 of BSISO1 and phase 3 of BSISO2). Further examinations indicate that the abovementioned findings are not dependent upon the strengths of the BSISOs.
KW - diurnal convection
KW - East Asia
KW - intra-seasonal oscillation
UR - http://www.scopus.com/inward/record.url?scp=85044791211&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85044791211&partnerID=8YFLogxK
U2 - 10.1002/joc.5326
DO - 10.1002/joc.5326
M3 - Article
VL - 38
SP - 2187
EP - 2200
JO - International Journal of Climatology
JF - International Journal of Climatology
SN - 0899-8418
IS - 5
ER -