Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020GL091041 |
Dry spells, wet days and their trends across southern Africa during the summer rainy season | |
Wanjiru Thoithi; Ross C. Blamey; Chris J. C. Reason | |
2021-02-01 | |
发表期刊 | Geophysical Research Letters |
出版年 | 2021 |
英文摘要 | Dry spell frequency and wet day occurrence during the summer rainy season across southern Africa are examined using daily rainfall for 1982‐2019. Evidence shows two sharp gradients in dry spell frequency, extending southeast from southern Angola to the African south coast near the westernmost boundary of preferred cloud band occurrences (diagonal gradient), and west from the Limpopo River Valley along 22‐24°S (meridional gradient) (along 14‐16oS in early summer) related to regional topography. Trend analysis suggests that the diagonal gradient has weakened during 1982‐2019 along with some other large areas in southern Africa whereas this is only true for part of the meridional gradient. Contrastingly, wet days and Normalized Difference Vegetation Index have significantly increased in several important agricultural areas in southern Africa. Evidence suggests these changes are related to those in the mid‐level Botswana High, El Niño Southern Oscillation, Southern Annular Mode and subtropical Indian Ocean dipole. |
领域 | 气候变化 |
URL | 查看原文 |
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/313808 |
专题 | 气候变化 |
推荐引用方式 GB/T 7714 | Wanjiru Thoithi,Ross C. Blamey,Chris J. C. Reason. Dry spells, wet days and their trends across southern Africa during the summer rainy season[J]. Geophysical Research Letters,2021. |
APA | Wanjiru Thoithi,Ross C. Blamey,&Chris J. C. Reason.(2021).Dry spells, wet days and their trends across southern Africa during the summer rainy season.Geophysical Research Letters. |
MLA | Wanjiru Thoithi,et al."Dry spells, wet days and their trends across southern Africa during the summer rainy season".Geophysical Research Letters (2021). |
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