| DOI: | 10.1175/JCLI-D-17-0017.1
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| Scopus记录号: | 2-s2.0-85052815448
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| 论文题名: | Characterizing the synoptic expression of the angola low |
| 作者: | Howard E.; Washington R.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2018
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| 卷: | 31, 期:17 | | 起始页码: | 7147
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| 结束页码: | 7165
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| 语种: | 英语
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| 英文关键词: | Africa
; Reanalysis data
; Synoptic climatology
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| Scopus关键词: | Climate models
; Climatology
; Africa
; Combined effect
; Cyclonic vorticity
; Future climate
; Low pressure systems
; Reanalysis
; Synoptic climatology
; Tropical regions
; Tropics
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| 英文摘要: | The Angola low is a key feature of the southern Africa wet season atmosphere that influences precipitation across the continent. This paper uses ERA-Interim to show that the synoptic expression of the Angola low is a combination of dry heat lows and moist tropical low pressure systems. The Angola heat low and Angola tropical low composites are contrasted against similar lows observed in other continental tropical regions and found to be broadly comparable. The implications that the distinction between dry and moist events has for the interannual relationship among the Angola low, precipitation, and ENSO are examined. The tropical lows exhibit unusual semistationary behavior by lingering in the Angola region rather than traveling offshore. This behavior is proposed to be caused by an integrated sea breeze-anabatic wind that enhances (inhibits) cyclonic vorticity stretching and convection inland (near the coast). The combined effect of the heat lows and the anchored tropical lows creates the Angola low in the climatological average. By elucidating the mechanisms of the Angola low, this research improves the foundation of process-based evaluation of southern Africa present and future climate in CMIP and AMIP models. © 2018 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/111395
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| Appears in Collections: | 气候减缓与适应
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作者单位: | School of Geography and the Environment, University of Oxford, Oxford, United Kingdom
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| Recommended Citation: | |
Howard E.,Washington R.. Characterizing the synoptic expression of the angola low[J]. Journal of Climate,2018-01-01,31(17)
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