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Reexamination of the Madden?Julian Oscillation Effect on Wintertime Sea Ice Concentrations in the North Pacific

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Title
Reexamination of the Madden?Julian Oscillation Effect on Wintertime Sea Ice Concentrations in the North Pacific
Other Titles
북태평양의 겨울철 해빙 농도에 대한 매든-줄리안 진동 효과의 재검토
Authors
Hong, Ja-Young
Kim, Joo-Hong
박두선
Keywords
Arctic; Bering Sea; Madden?Julian Oscillation; North Pacific; Rossby wave; Sea of Okhotsk; sea ice concentration
Issue Date
2019
Citation
Hong, Ja-Young, Kim, Joo-Hong, 박두선. 2019. "Reexamination of the Madden?Julian Oscillation Effect on Wintertime Sea Ice Concentrations in the North Pacific". ATMOSPHERE, 11(1): 7-16.
Abstract
In the Pacific sector of the Arctic, a noticeable dipole pattern of the sea ice concentration (SIC) between the Sea of Okhotsk and the Bering Sea has been reported on timescales of weeks to months. The dipole pattern owes its existence to the large-scale circulation variability across the North Pacific. Meanwhile, it is well known that eastward propagating tropical convection on an intra-seasonal timescale, the Madden?Julian Oscillation (MJO), forms large-scale circulation anomalies in the North Pacific through the poleward-propagating Rossby waves that are stimulated by MJO-related tropical convection, which is often manifested as a Pacific?North American teleconnection pattern. Few studies, however, have focused on the lagged MJO influence on the SIC change in the high-latitude North Pacific by poleward-propagating waves. Thus, herein we investigate the intra-seasonal SIC variations associated with the MJO phases by considering the lagged circulation response. The dipole pattern in the composite daily SIC change map between the two seas becomes apparent after approximately one week of MJO phases 3 and 7. In the Bering Sea (the Sea of Okhotsk), the SIC increases after MJO phase 3 (phase 7), while it decreases in phase 7 (phase 3). The lagged anomalous circulation pattern in the North Pacific associated with the MJO leads to SIC changes primarily through the dynamic response in 10 m winds and the resultant sea ice motion.
URI
http://repository.kopri.re.kr/handle/201206/10242
DOI
http://dx.doi.org/10.3390/atmos11010007
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