Abstract
Observational data show that the dominant mode of the boreal winter rainfall anomalies in the tropical Indo-Western Pacific (IWP) is a west-east dipolar pattern, which is called the Indo-Western Pacific Dipole (IWPD) mode and is related to El Niño-Southern Oscillation. It is found that corresponded to the IWPD mode is a new atmospheric teleconnection pattern—a wave train pattern emitted from the IWP toward Asia and the northwest Pacific in winter. During the positive (negative) phase of the IWPD, the teleconnection pattern features the negative (positive) anomalies of 200-hPa geopotential height (H200) centered at 30°N, 110°E and the positive (negative) anomalies of H200 centered at 45°N, 140°E. The teleconnection pattern represents the dominant mode of the boreal winter H200 anomaly over Asia. A series of simple atmospheric model experiments are performed to confirm that this winter teleconnection pattern is induced by the heating anomalies associated with the IWPD, and the heating anomalies over the equatorial central Pacific are not important to this teleconnection pattern from the IWP toward Asia and the northeast Pacific. The IWPD is strengthened after the climate regime shift of the 1970s, which leads to a stronger teleconnection pattern.
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Acknowledgments
We thank Dr. Sang-Ki Lee for sharing the model code and helping to run the model. We also thank two anonymous reviewers for their constructive comments and suggestions. This work is supported by Ministry of Science and Technology of China (National Basic Research Program of China 2012CB955602 and National Key Program for Developing Basic Science 2010CB428904), the Changjiang Scholar Program and Natural Science Foundation of China (40830106, 40921004, 41176006 and 41106010).
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Zheng, J., Liu, Q., Wang, C. et al. Impact of Heating Anomalies Associated with Rainfall Variations over the Indo-Western Pacific on Asian Atmospheric Circulation in Winter. Clim Dyn 40, 2023–2033 (2013). https://doi.org/10.1007/s00382-012-1478-x
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DOI: https://doi.org/10.1007/s00382-012-1478-x