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DOI | 10.1007/s00382-018-4382-1 |
Orbital modulation of ENSO seasonal phase locking | |
Lu, Zhengyao1,3; Liu, Zhengyu2 | |
2019-04-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 52页码:4329-4350 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; Sweden |
英文摘要 | Modern El Nino-Southern Oscillation (ENSO) events are characterized by their phase locking of variability to the seasonal cycle and tend to peak at the end of calendar year. Here, we show that in an idealized NCAR-CCSM3 simulation of the climate of the last 300,000years, ENSO seasonal phase locking is shifted periodically following the precessional forcing: ENSO tends to peak in boreal winter when perihelion is near vernal equinox, but to peak in boreal summer when perihelion lies in between autumnal equinox and winter solstice. The mechanism for the change of ENSO's phase locking is proposed to be caused by the change of seasonality of the growth rate, or the intensity of ocean-atmosphere feedbacks, of ENSO. It is found that the December peak of winter ENSO' is caused by the continuous growth of ENSO anomaly from June to November, while the May-June peak of summer ENSO' appears to be caused jointly by the seasonal shift of higher growth rate into spring and stronger stochastic noise towards the first half of the year. Furthermore, the change of the seasonal cycle of feedbacks is contributed predominantly by that of the thermodynamic damping. The summer peak of ENSO is proposed to be caused by the following mechanism. A perihelion in the late fall to early winter leads to a cooling of the surface eastern equatorial Pacific (EEP) due to reduced insolation in spring. This cooling, reinforced by an oceanic process, reduces the latent heat flux damping in spring, and therefore favors the growth of the eastern Pacific-like ENSO (as opposed to the central Pacific-like ENSO). This EEP cooling is also likely to generate more effective short wave-cloud-SST feedback and, in turn, increased instability. Ultimately, the weakened thermodynamic damping in spring, combined with relatively intensive stochastic forcing, benefits the subsequent summer peak of ENSO. |
英文关键词 | ENSO Orbital forcing Ocean-atmosphere feedbacks Phase locking |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467187600030 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; NINO SOUTHERN-OSCILLATION ; WESTERLY WIND BURSTS ; EL-NINO ; ATMOSPHERE FEEDBACKS ; ANNUAL CYCLE ; CLIMATE ; PACIFIC ; CMIP3 ; VARIABILITY |
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/181900 |
专题 | 气候变化 |
作者单位 | 1.Peking Univ, Sch Phys, Lab Climate Ocean & Atmosphere Studies, Beijing 100871, Peoples R China; 2.Ohio State Univ, Dept Geog, Columbus, OH 43210 USA; 3.Lund Univ, Dept Phys Geog & Ecosyst Sci, S-22362 Lund, Sweden |
推荐引用方式 GB/T 7714 | Lu, Zhengyao,Liu, Zhengyu. Orbital modulation of ENSO seasonal phase locking[J]. CLIMATE DYNAMICS,2019,52:4329-4350. |
APA | Lu, Zhengyao,&Liu, Zhengyu.(2019).Orbital modulation of ENSO seasonal phase locking.CLIMATE DYNAMICS,52,4329-4350. |
MLA | Lu, Zhengyao,et al."Orbital modulation of ENSO seasonal phase locking".CLIMATE DYNAMICS 52(2019):4329-4350. |
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