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An inter-decadal increase in summer sea level pressure over the Mongolian region around the early 1990s

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Abstract

The East Asian summer monsoon is affected by processes in the mid-high latitudes in addition to various tropical and subtropical systems. The present study investigates the summer sea level pressure (SLP) variability over northern East Asia (NEA) and emphasizes the closed active center over the Mongolian region. It is found that the seasonal mean Mongolian SLP (MSLP) anomaly is closely connected with the variability of summertime regional synoptic extra-tropical cyclones on longer time scales. A significant inter-decadal increase in the MSLP around the early 1990s has been detected, which is accompanied by a weakening in the activity of regional extra-tropical cyclones. Recent warming over NEA may have a contribution to the inter-decadal change, which features evidently meridional inhomogeneity around 45°N. The inhomogeneous air temperature anomaly distribution results in decreased vertical wind shear, reduced atmospheric baroclinicity over the Mongolian region, and thus inactive regional cyclones and increased MSLP in the latter decade. The associated temperature anomaly distribution may be partly attributed to regional inhomogeneity in cloud and radiation anomalies, and it is further maintained by two positive feedback mechanisms associated with atmospheric internal processes: one via adiabatic heating and the other via horizontal temperature advection.

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Acknowledgements

This research was jointly supported by National Natural Science Foundation of China (41530503), National Key Basic Research and Development Projects of China (2016YFA0600601 and 2014CB953901), Research Projects of Public Welfare Meteorological Industry in China (201406001). RW acknowledges the support of National Natural Science Foundation of China grants (41530425 and 41475081).

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Authors and Affiliations

  1. Center for Monsoon and Environment Research, School of Atmospheric Sciences, Sun Yat-sen University, Guangzhou, China

    Haiyan Zhang, Zhiping Wen, Xiuzhen Li & Ruidan Chen

  2. Institute of Atmospheric Sciences, Fudan University, Shanghai, 200433, China

    Zhiping Wen

  3. South China Sea Marine Forecasting Center of State Oceanic Administration, Beijing, China

    Haiyan Zhang

  4. Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China

    Renguang Wu

  5. Jiangsu Collaborative Innovation Center for Climate Change, Nanjing, China

    Zhiping Wen, Xiuzhen Li & Ruidan Chen

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  1. Haiyan Zhang
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  2. Zhiping Wen
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  3. Renguang Wu
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  4. Xiuzhen Li
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  5. Ruidan Chen
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Correspondence to Zhiping Wen.

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Zhang, H., Wen, Z., Wu, R. et al. An inter-decadal increase in summer sea level pressure over the Mongolian region around the early 1990s. Clim Dyn 52, 1935–1948 (2019). https://doi.org/10.1007/s00382-018-4228-x

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  • DOI: https://doi.org/10.1007/s00382-018-4228-x

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