Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-18-0173.1 |
A Systematic Comparison of Tropical Waves over Northern Africa. Part I: Influence on Rainfall | |
Schlueter, Andreas1; Fink, Andreas H.1; Knippertz, Peter1; Vogel, Peter1,2 | |
2019-03-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:5页码:1501-1523 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Low-latitude rainfall variability on the daily to intraseasonal time scale is often related to tropical waves, including convectively coupled equatorial waves, the Madden-Julian oscillation (MJO), and tropical disturbances (TDs). Despite the importance of rainfall variability for vulnerable societies in tropical Africa, the relative influence of tropical waves for this region is largely unknown. This article presents the first systematic comparison of the impact of six wave types on precipitation over northern tropical Africa during the transition and full monsoon seasons, using two satellite products and a dense rain gauge network. Composites of rainfall anomalies in the different datasets show comparable modulation intensities in the West Sahel and at the Guinea Coast, varying from less than 2 to above 7 mm day(-1) depending on the wave type. African easterly waves (AEWs) and Kelvin waves dominate the 3-hourly to daily time scale and explain 10%-30% locally. On longer time scales (7-20 days), only the MJO and equatorial Rossby (ER) waves remain as modulating factors and explain about up to one-third of rainfall variability. Eastward inertio-gravity waves and mixed Rossby-gravity (MRG) waves are comparatively unimportant. An analysis of wave superposition shows that low-frequency waves (MJO, ER) in their wet phase amplify the activity of high-frequency waves (TD, MRG) and suppress them in the dry phase. The results stress that more attention should be paid to tropical waves when forecasting rainfall over northern tropical Africa. |
英文关键词 | Africa Inertia-gravity waves Kelvin waves Madden-Julian oscillation Rainfall Tropical variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000457772000001 |
WOS关键词 | COUPLED EQUATORIAL WAVES ; MADDEN-JULIAN OSCILLATION ; INERTIO GRAVITY-WAVES ; SAHARAN HEAT LOW ; INTRASEASONAL VARIABILITY ; EASTERLY WAVES ; KELVIN WAVES ; MARITIME CONTINENT ; LOWER STRATOSPHERE ; MONSOON DYNAMICS |
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/20198 |
专题 | 气候变化 |
作者单位 | 1.Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany; 2.Karlsruhe Inst Technol, Inst Stochast, Karlsruhe, Germany |
推荐引用方式 GB/T 7714 | Schlueter, Andreas,Fink, Andreas H.,Knippertz, Peter,et al. A Systematic Comparison of Tropical Waves over Northern Africa. Part I: Influence on Rainfall[J]. JOURNAL OF CLIMATE,2019,32(5):1501-1523. |
APA | Schlueter, Andreas,Fink, Andreas H.,Knippertz, Peter,&Vogel, Peter.(2019).A Systematic Comparison of Tropical Waves over Northern Africa. Part I: Influence on Rainfall.JOURNAL OF CLIMATE,32(5),1501-1523. |
MLA | Schlueter, Andreas,et al."A Systematic Comparison of Tropical Waves over Northern Africa. Part I: Influence on Rainfall".JOURNAL OF CLIMATE 32.5(2019):1501-1523. |
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