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On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000

机译:2000年以来缩短海洋暖水量对ENSO SST的提前期

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摘要

The possible factors associated with the shortening of lead time between ocean warm water volume (WWV) variability along the equatorial Pacific and El Niño–Southern Oscillation (ENSO) variability after 2000 are documented. It is shown that the shortening of lead time is due to frequency increases of both WWV and ENSO. During 1979–99 the dominant frequencies were 1.5–3.5 years for both the Niño3.4 and WWV indices. In contrast, during 2000–16, both indices had a relatively flatter spectrum and were closer to a white noise process with a relative maximum at 1.5–2.0 years for the Niño3.4 index and 0.8–1.3 years for the WWV index. The frequency change of ENSO and WWV were linked to a westward shift of the Bjerknes feedback region. The results here are consistent with previous argument that the westward shift of the air-sea coupling region will cause an increase of ENSO frequency, as the corresponding zonal advection feedback reduces the period and growth of coupled instability, thus favoring more frequent and weak El Niño events.
机译:记录了与赤道太平洋沿岸的海洋暖水量(WWV)变率和2000年之后的厄尔尼诺-南方涛动(ENSO)变率之间的提前期缩短有关的可能因素。结果表明,交货时间的缩短是由于WWV和ENSO的频率增加。 Niño3.4和WWV指数在1979–99年间的主频为1.5–3.5年。相反,在2000-16年期间,两个指数的频谱都相对平坦,并且更接近白噪声过程,Niño3.4指数的相对最大值在1.5-2.0年,WWV指数的相对最大值在0.8-1.3年。 ENSO和WWV的频率变化与Bjerknes反馈区的西移有关。此处的结果与先前的论点一致,即海-气耦合区域的西移将引起ENSO频率的增加,因为相应的纬向平流反馈减少了耦合不稳定的周期和增长,因此有利于厄尔尼诺现象的频繁发生和减弱。事件。

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