Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-19-0437.1 |
Drylines in Southern Africa: Rediscovering the Congo Air Boundary | |
Howard, Emma; Washington, Richard | |
2019-12-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:23页码:8223-8242 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
英文摘要 | Projected rainfall decline in southern Africa is likely to be highly sensitive to subtleties in the local atmospheric circulation. In an effort to understand the regional circulation complexities, a novel algorithm is developed to identify the Congo air boundary (CAB) in ERA-5, a high-resolution reanalysis dataset. The CAB, a forgotten feature of the circulation, is defined in the austral spring and early summer, using surface humidity gradients and near-surface wind convergence lines, and it is found to be an indicator of the location of the southern edge of the African rain belt. A related convergence-line and dryline feature, described in this paper as the Kalahari discontinuity (KD), is also identified. It is established that either a dryline CAB or KD is present in southern Africa for over 95% of days between August and December, with arc lengths typically exceeding 10 degrees. The seasonal and diurnal cycles of the CAB and the KD are presented, and their prevalence in station observational data is confirmed. The interannual variability of the CAB latitude and detection frequency is found to explain at least 55% of interannual spring rainfall variability in southern Africa between 15 degrees to 25 degrees S. Links are established with the Angola and Kalahari heat lows and tropical temperate trough events. |
英文关键词 | Africa Drylines Moisture moisture budget Reanalysis data Pattern recognition |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000494722000004 |
WOS关键词 | CLIMATE ; RAINFALL ; CYCLE |
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/225638 |
专题 | 环境与发展全球科技态势 |
作者单位 | Univ Oxford, Sch Geog & Environm, Oxford, England |
推荐引用方式 GB/T 7714 | Howard, Emma,Washington, Richard. Drylines in Southern Africa: Rediscovering the Congo Air Boundary[J]. JOURNAL OF CLIMATE,2019,32(23):8223-8242. |
APA | Howard, Emma,&Washington, Richard.(2019).Drylines in Southern Africa: Rediscovering the Congo Air Boundary.JOURNAL OF CLIMATE,32(23),8223-8242. |
MLA | Howard, Emma,et al."Drylines in Southern Africa: Rediscovering the Congo Air Boundary".JOURNAL OF CLIMATE 32.23(2019):8223-8242. |
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