Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-18-0387.1 |
Implications of Improved Representation of Convection for the East Africa Water Budget Using a Convection-Permitting Model | |
Finney, Declan L.1; Marsham, John H.1,2; Jackson, Lawrence S.1; Kendon, Elizabeth J.3; Rowell, David P.3; Boorman, Penelope M.3; Keane, Richard J.3; Stratton, Rachel A.3; Senior, Catherine A.3 | |
2019-04-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:7页码:2109-2129 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | The precipitation and diabatic heating resulting from moist convection make it a key component of the atmospheric water budget in the tropics. With convective parameterization being a known source of uncertainty in global models, convection-permitting (CP) models are increasingly being used to improve understanding of regional climate. Here, a new 10-yr CP simulation is used to study the characteristics of rainfall and atmospheric water budget for East Africa and the Lake Victoria basin. The explicit representation of convection leads to a widespread improvement in the intensities and diurnal cycle of rainfall when compared with a parameterized simulation. Differences in large-scale moisture fluxes lead to a shift in the mean rainfall pattern from the Congo to Lake Victoria basin in the CP simulation-highlighting the important connection between local changes in the representation of convection and larger-scale dynamics and rainfall. Stronger lake-land contrasts in buoyancy in the CP model lead to a stronger nocturnal land breeze over Lake Victoria, increasing evaporation and moisture flux convergence (MFC), and likely unrealistically high rainfall. However, for the mountains east of the lake, the CP model produces a diurnal rainfall cycle much more similar to satellite estimates, which is related to differences in the timing of MFC. Results here demonstrate that, while care is needed regarding lake forcings, a CP approach offers a more realistic representation of several rainfall characteristics through a more physically based realization of the atmospheric dynamics around the complex topography of East Africa. |
英文关键词 | Africa Convective-scale processes Mesoscale processes Rainfall Climate models Model evaluation performance |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462185000002 |
WOS关键词 | SATELLITE RAINFALL PRODUCTS ; MOIST CONVECTION ; PRECIPITATION ; SCHEME ; RESOLUTION ; VARIABILITY ; VALIDATION ; MECHANISMS ; MESOSCALE ; 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/182134 |
专题 | 气候变化 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds, W Yorkshire, England; 2.Univ Leeds, Natl Ctr Atmospher Sci, Leeds, W Yorkshire, England; 3.Met Off, Exeter, Devon, England |
推荐引用方式 GB/T 7714 | Finney, Declan L.,Marsham, John H.,Jackson, Lawrence S.,et al. Implications of Improved Representation of Convection for the East Africa Water Budget Using a Convection-Permitting Model[J]. JOURNAL OF CLIMATE,2019,32(7):2109-2129. |
APA | Finney, Declan L..,Marsham, John H..,Jackson, Lawrence S..,Kendon, Elizabeth J..,Rowell, David P..,...&Senior, Catherine A..(2019).Implications of Improved Representation of Convection for the East Africa Water Budget Using a Convection-Permitting Model.JOURNAL OF CLIMATE,32(7),2109-2129. |
MLA | Finney, Declan L.,et al."Implications of Improved Representation of Convection for the East Africa Water Budget Using a Convection-Permitting Model".JOURNAL OF CLIMATE 32.7(2019):2109-2129. |
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