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Ocean Processes Affecting the Twenty-First-Century Shift in ENSO SST Variability
Guan, Cong1,2,3; McPhaden, Michael J.3
Source PublicationJOURNAL OF CLIMATE
AbstractSea surface temperature (SST) variability associated with El Nino-Southern Oscillation (ENSO) slightly increased in the central Pacific Ocean but weakened significantly in the eastern Pacific at the beginning of twenty-first century relative to 1980-99. This decadal shift led to the greater prominence central Pacific (CP) El Nino events during the 2000s relative to the previous two decades, which were dominated by eastern Pacific (EP) events. To expand upon previous studies that have examined this shift in ENSO variability, temperature and temperature variance budgets are examined in the mixed layer of the Nino-3 (5 degrees S-5 degrees N, 150 degrees-90 degrees W) and Nino-4 (5 degrees S-5 degrees N, 160 degrees E-150 degrees W) regions from seven ocean model products spanning the period 1980-2010. This multimodel-product-based approach provides a robust assessment of dominant mechanisms that account for decadal changes in two key index regions. A temperature variance budget perspective on the role of thermocline feedbacks in the ENSO cycle based on recharge oscillator theory is also presented. As found in previous studies, thermocline and zonal advective feedbacks are the most important positive feedbacks for generating ENSO SST variance, and thermodynamic damping is the largest negative feedback for damping ENSO variance. Consistent with the shift toward more CP El Ninos after 2000, thermocline feedbacks experienced a substantial reduction from 1980 to 1999 and into the 2000s, while zonal advective feedbacks were less affected. Negative feedbacks likewise weakened after 2000, particularly thermal damping in the Nino-3 region and the nonlinear sink of variance in both regions.
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WOS IDWOS:000384148000002
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China
2.Univ Chinese Acad Sci, Beijing, Peoples R China
3.NOAA, Pacific Marine Environm Lab, 7600 Sand Point Way Ne, Seattle, WA 98115 USA
First Author AffilicationKey Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Guan, Cong,McPhaden, Michael J.. Ocean Processes Affecting the Twenty-First-Century Shift in ENSO SST Variability[J]. JOURNAL OF CLIMATE,2016,29(19):6861-6879.
APA Guan, Cong,&McPhaden, Michael J..(2016).Ocean Processes Affecting the Twenty-First-Century Shift in ENSO SST Variability.JOURNAL OF CLIMATE,29(19),6861-6879.
MLA Guan, Cong,et al."Ocean Processes Affecting the Twenty-First-Century Shift in ENSO SST Variability".JOURNAL OF CLIMATE 29.19(2016):6861-6879.
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