Abstract
The present study contrasts interannual variations in the intensity of boreal summer 10–20-day and 30–60-day intraseasonal oscillations (ISOs) over the tropical western North Pacific and their factors. A pronounced difference is found in the relationship of the two ISOs to El Niño-Southern Oscillation. The 10–20-day ISO intensity is enhanced during El Niño develo** summer, whereas the 30–60-day ISO intensity is enhanced during La Niña decaying summer. The above different relationship is interpreted as follows. The equatorial central and eastern Pacific SST anomalies modify vertical wind shear, lower-level moisture, and vertical motion in a southeast-northwest oriented band from the equatorial western Pacific to the tropical western North Pacific where the 10–20-day ISOs originate and propagate. These background field changes modulate the amplitude of 10–20-day ISOs. Preceding equatorial central and eastern Pacific SST anomalies induce SST anomalies in the North Indian Ocean in summer, which in turn modify vertical wind shear and vertical motion over the tropical western North Pacific. The modified background fields influence the amplitude of the 30–60-day ISOs when they reach the tropical western North Pacific from the equatorial region. A feedback of ISO intensity on local SST change is identified in the tropical western North Pacific likely due to a net effect of ISOs on surface heat flux anomalies. This feedback is more prominent from the 10–20-day than the 30–60-day ISO intensity change.
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Acknowledgments
Two anonymous reviewers provide comments that help improve the manuscript. This study is supported by the National Key Basic Research Program of China grant (2014CB953902) 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 and GPCP version 2.2 precipitation data are obtained from http://www.esrl.noaa.gov/psd/.
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Wu, R., Cao, X. Relationship of boreal summer 10–20-day and 30–60-day intraseasonal oscillation intensity over the tropical western North Pacific to tropical Indo-Pacific SST. Clim Dyn 48, 3529–3546 (2017). https://doi.org/10.1007/s00382-016-3282-5
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DOI: https://doi.org/10.1007/s00382-016-3282-5