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Feedback of 10–20-day intraseasonal oscillations on seasonal mean SST in the tropical Western North Pacific during boreal spring through fall

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Abstract

The present study documents the factors for year-to-year changes in the intensity of 10–20-day intraseasonal oscillations (ISOs) and investigates the feedback of the 10–20-day ISO intensity on seasonal mean sea surface temperature (SST) change in the tropical western North Pacific during boreal spring through fall. An analysis of local correlation reveals a significant negative correlation of the 10–20-day ISO intensity and the seasonal mean SST tendency in the tropical western North Pacific during spring, summer, and fall, suggesting a plausible feedback of the ISO intensity on seasonal mean SST anomaly. The 10–20-day ISO intensity change over the tropical western North Pacific is influenced by El Niño-Southern Oscillation (ENSO) through modulation of vertical shear of zonal winds, lower-level moisture, and upward motion. Due to the phase dependence of location of these ENSO-induced background field changes, the ISO intensity is subject to ENSO influence in different regions during the three seasons. The feedback of the 10–20-day ISO intensity on local seasonal mean SST change in the tropical western North Pacific is demonstrated by separating latent heat flux anomalies into components on different time scales. The ISO-induced latent heat flux anomalies may accumulate in a season and overcome interannual anomalies due to seasonal mean changes. Thus, the ISO-induced surface heat flux change may play an important role in the seasonal mean SST anomaly in the tropical western North Pacific.

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Acknowledgments

The two anonymous reviewers’ comments help to improve the paper. This study is supported by the National Key Basic Research Program of China grant (2014CB953902), the National Key Research and Development Program grant (2016YFA0600603), and the National Natural Science Foundation of China grants (41475081, 41275081, and 41530425). The NCEP-DOE reanalysis 2 data and the NOAA OLR data were obtained from ftp://ftp.cdc.noaa.gov/. The NOAA OI version 2 SST data are obtained from http://www.esrl.noaa.gov/psd/.

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Authors and Affiliations

  1. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Building 40, Huayanli, Beichen West Road, Chaoyang District, Bei**g, 100029, China

    Renguang Wu

  2. State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Bei**g, China

    Renguang Wu

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Correspondence to Renguang Wu.

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This paper is a contribution to the special issue on East Asian Climate under Global Warming: Understanding and Projection, consisting of papers from the East Asian Climate (EAC) community and the 13th EAC International Workshop in Bei**g, China on 24–25 March 2016, and coordinated by Jian** Li, Huang-Hsiung Hsu, Wei-Chyung Wang, Kyung-Ja Ha, Tim Li, and Akio Kitoh.

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Wu, R. Feedback of 10–20-day intraseasonal oscillations on seasonal mean SST in the tropical Western North Pacific during boreal spring through fall. Clim Dyn 51, 4169–4184 (2018). https://doi.org/10.1007/s00382-016-3362-6

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  • DOI: https://doi.org/10.1007/s00382-016-3362-6

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