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DOI | 10.1175/JCLI-D-19-0159.1 |
Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10 degrees Ocean Model | |
Li, Qian1,2,3; Lee, Sukyoung1; England, Matthew H.2,3; McClean, Julie L.4 | |
2019-09-01 | |
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:18页码:6177-6195 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Australia |
英文摘要 | The relationship between the southern annular mode (SAM) and Southern Ocean mixed layer depth (MLD) is investigated using a global 0.1 degrees resolution ocean model. The SAM index is defined as the principal component time series of the leading empirical orthogonal function of extratropical sea level pressure from September to December, when the zonally symmetric SAM feature is most prominent. Following positive phases of the SAM, anomalous deep mixed layers occur in the subsequent fall season, starting in May, particularly in the southeast Pacific. Composite analyses reveal that for positive SAM phases enhanced surface cooling caused by anomalously strong westerlies weakens the stratification of the water column, leading to deeper mixed layers during spring when the SAM signal is at its strongest. During the subsequent summer, the surface warms and the mixed layer shoals. However, beneath the warm surface layer, anomalously weak stratification persists throughout the summer and into fall. When the surface cools again during fall, the mixed layer readily deepens due to this weak interior stratification, a legacy from the previous springtime conditions. Therefore, the spring SAM-fall MLD relationship is interpreted here as a manifestation of reemergence of interior water mass anomalies. The opposite occurs after negative phases of the SAM, with anomalously shallow mixed layers resulting. Additional analyses reveal that for the MLD region in the southeast Pacific, the effects of salinity variations and Ekman heat advection are negligible, although Ekman heat transport may play an important role in other regions where mode water is formed, such as south of Australia and in the Indian Ocean. |
英文关键词 | Southern Ocean Atmosphere-ocean interaction Mixed layer Climate variability General circulation models Interannual variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000482381300001 |
WOS关键词 | ANTARCTIC CIRCUMPOLAR WAVE ; SEA-SURFACE TEMPERATURE ; ANTHROPOGENIC CARBON ; VARIABILITY ; CIRCULATION ; ATMOSPHERE ; OSCILLATION ; TRENDS ; IMPACT ; WATER |
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/186789 |
专题 | 气候变化 |
作者单位 | 1.Penn State Univ, Dept Meteorol & Atmospher Sci, State Coll, PA 16801 USA; 2.Univ New South Wales, Climate Change Res Ctr, Sydney, NSW, Australia; 3.Univ New South Wales, ARC Ctr Excellence Climate Syst Sci, Sydney, NSW, Australia; 4.Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA |
推荐引用方式 GB/T 7714 | Li, Qian,Lee, Sukyoung,England, Matthew H.,et al. Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10 degrees Ocean Model[J]. JOURNAL OF CLIMATE,2019,32(18):6177-6195. |
APA | Li, Qian,Lee, Sukyoung,England, Matthew H.,&McClean, Julie L..(2019).Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10 degrees Ocean Model.JOURNAL OF CLIMATE,32(18),6177-6195. |
MLA | Li, Qian,et al."Seasonal-to-Interannual Response of Southern Ocean Mixed Layer Depth to the Southern Annular Mode from a Global 1/10 degrees Ocean Model".JOURNAL OF CLIMATE 32.18(2019):6177-6195. |
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