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

Abstract 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 inc...

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Autores principales:	Zeng-Zhen Hu, Arun Kumar, Jieshun Zhu, Bohua Huang, Yu-heng Tseng, Xiaochun Wang
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/83aff2292d1949ac991c7c8552dce33a
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spelling	oai:doaj.org-article:83aff2292d1949ac991c7c8552dce33a2021-12-02T11:52:22ZOn the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 200010.1038/s41598-017-04566-z2045-2322https://doaj.org/article/83aff2292d1949ac991c7c8552dce33a2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04566-zhttps://doaj.org/toc/2045-2322Abstract 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.Zeng-Zhen HuArun KumarJieshun ZhuBohua HuangYu-heng TsengXiaochun WangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Zeng-Zhen Hu Arun Kumar Jieshun Zhu Bohua Huang Yu-heng Tseng Xiaochun Wang On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
description	Abstract 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.
format	article
author	Zeng-Zhen Hu Arun Kumar Jieshun Zhu Bohua Huang Yu-heng Tseng Xiaochun Wang
author_facet	Zeng-Zhen Hu Arun Kumar Jieshun Zhu Bohua Huang Yu-heng Tseng Xiaochun Wang
author_sort	Zeng-Zhen Hu
title	On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
title_short	On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
title_full	On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
title_fullStr	On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
title_full_unstemmed	On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000
title_sort	on the shortening of the lead time of ocean warm water volume to enso sst since 2000
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/83aff2292d1949ac991c7c8552dce33a
work_keys_str_mv	AT zengzhenhu ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000 AT arunkumar ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000 AT jieshunzhu ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000 AT bohuahuang ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000 AT yuhengtseng ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000 AT xiaochunwang ontheshorteningoftheleadtimeofoceanwarmwatervolumetoensosstsince2000
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On the Shortening of the Lead Time of Ocean Warm Water Volume to ENSO SST Since 2000

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