Reexamination of the Madden？Julian Oscillation Effect on Wintertime Sea Ice Concentrations in the North Pacific
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- 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
- Hong, Ja-Young
- Arctic; Bering Sea; Madden？Julian Oscillation; North Pacific; Rossby wave; Sea of Okhotsk; sea ice concentration
- Issue Date
- 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.
- 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.
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