Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-018-4162-y |
The role of mesoscale convective systems in the diurnal cycle of rainfall and its seasonality over sub-Saharan Northern Africa | |
Liu, Weiran; Cook, Kerry H.; Vizy, Edward K. | |
2019 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:729-745 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study evaluates the role of MCSs in the total rainfall distribution as a function of season from a climatological perspective (1998-2014) over sub-Saharan northern Africa and examines how the diurnal cycle of rainfall changes with season. Tropical Rainfall Measuring Mission (TRMM) 3B42V7 rainfall estimates and European Centre for Medium-Range Weather Forecasts ERA-Interim reanalysis are used to evaluate the climatology. The percentages of the full TRMM precipitation delivered by MCSs have meridional structures in spring, fall and winter, ranging from 0 to 80% across sub-Saharan northern Africa, while the percentages are homogenous in summer (>80%). The diurnal cycles of MCS-associated precipitation coincide with the full TRMM rainfall. Attributes of MCSs, including size, count, and intensity, vary synchronously with the diurnal cycle of rainfall. The diurnal peaks are classified into three categories: single afternoon peak, continuous afternoon peak, and nocturnal peak. Single afternoon peaks dominate in spring and fall while continuous afternoon and nocturnal peaks are more common in summer, indicating the seasonality of the diurnal cycle. The continuous afternoon peak combines rainfall from two system typesone locally-generated and one propagating. The seasonality of the diurnal cycle is related to the seasonality of MCS lifetimes, and propagation speeds and directions. The moisture component of the MSE profile contributes to the instability most in summer when convection is more frequent. Low-level temperature, which is related to surface warming and sensible heat fluxes, influences the instability more during winter and spring. |
英文关键词 | MCS Diurnal cycle of precipitation SAHEL rainfall African wave disturbances African easterly waves West Africa Moist static energy |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460619200042 |
WOS关键词 | TROPICAL WEST-AFRICA ; EASTERLY WAVES ; DEEP CONVECTION ; ICE-SCATTERING ; SQUALL LINES ; PART II ; PRECIPITATION ; TRMM ; ATLANTIC ; MONSOON |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35838 |
专题 | 气候变化 |
作者单位 | Univ Texas Austin, Jackson Sch Geosci, Dept Geol Sci, 1 Univ Stn C1100, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Liu, Weiran,Cook, Kerry H.,Vizy, Edward K.. The role of mesoscale convective systems in the diurnal cycle of rainfall and its seasonality over sub-Saharan Northern Africa[J]. CLIMATE DYNAMICS,2019,52:729-745. |
APA | Liu, Weiran,Cook, Kerry H.,&Vizy, Edward K..(2019).The role of mesoscale convective systems in the diurnal cycle of rainfall and its seasonality over sub-Saharan Northern Africa.CLIMATE DYNAMICS,52,729-745. |
MLA | Liu, Weiran,et al."The role of mesoscale convective systems in the diurnal cycle of rainfall and its seasonality over sub-Saharan Northern Africa".CLIMATE DYNAMICS 52(2019):729-745. |
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