| DOI: | 10.1175/JCLI-D-16-0705.1
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| Scopus记录号: | 2-s2.0-85017517859
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| 论文题名: | The South Atlantic subtropical high: Climatology and interannual variability |
| 作者: | Sun X.; Cook K.H.; Vizy E.K.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2017
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| 卷: | 30, 期:9 | | 起始页码: | 3279
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| 结束页码: | 3296
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| 语种: | 英语
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| Scopus关键词: | Atmospheric pressure
; Climate change
; Dynamics
; Earth atmosphere
; Fluxes
; Tropics
; Windows
; Anticyclones
; Climate variability
; Eastern tropical pacific
; Interannual variability
; Interannual variation
; South Atlantic
; Southern Annular Mode
; Wave-activity flux
; Climatology
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| 英文摘要: | ERA-Interim and JRA-55 reanalysis products are analyzed to document the annual cycle of the South Atlantic subtropical high (SASH) and examine how its interannual variability relates to regional and large-scale climate variability. The annual cycle of the SASH is found to have two peaks in both intensity and size. The SASH is strongest and largest during the solstitial months when its center is either closest to the equator and on the western side of the South Atlantic basin during austral winter or farthest poleward and in the center of the basin in late austral summer. Although interannual variations in the SASH's position are larger in the zonal direction, the intensity of the high decreases when it is positioned to the north. This relationship is statistically significant in every month. Seasonal composites and EOF analysis indicate that meridional changes in the position of the SASH dominate interannual variations in austral summer. In particular, the anticyclone tends to be displaced poleward in La Niña years when the southern annular mode (SAM) is in its positive phase and vice versa. Wave activity flux vectors suggest that ENSO-related convective anomalies located in the central-eastern tropical Pacific act as a remote forcing for the meridional variability of the summertime SASH. In southern winter, multiple processes operate in concert to induce interannual variability, and none of them appears to dominate like ENSO does during the summer. © 2017 American Meteorological Society. |
| 资助项目: | NASA, National Aeronautics and Space Administration
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| Citation statistics: |
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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/49684
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States
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| Recommended Citation: | |
Sun X.,Cook K.H.,Vizy E.K.. The South Atlantic subtropical high: Climatology and interannual variability[J]. Journal of Climate,2017-01-01,30(9)
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