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Characteristics of the Asian–Pacific oscillation in boreal summer simulated by BCC_CSM with different horizontal resolutions

Abstract

The summer Asian–Pacific Oscillation (APO) is a major teleconnection pattern that reflects the zonal thermal contrast between East Asia and the North Pacific in the upper troposphere. The performance of Beijing Climate Center Climate System Models (BCC_CSMs) with different horizontal resolutions, i.e., BCC_CSM1.1 and BCC_CSM1.1(m), in reproducing APO interannual variability, APO-related precipitation anomalies, and associated atmospheric circulation anomalies, is evaluated. The results show that BCC_CSM1.1(m) can successfully capture the interannual variability of the summer APO index. It is also more capable in reproducing the APO’s spatial pattern, compared to BCC_CSM1.1, due to its higher horizontal resolution. Associated with a positive APO index, the northward-shifted and intensified South Asian high, strengthened extratropical westerly jet, and tropical easterly jet in the upper troposphere, as well as the southwesterly monsoonal flow over North Africa and the Indian Ocean in the lower troposphere, are realistically represented by BCC_CSM1.1(m), leading to an improvement in reproducing the increased precipitation over tropical North Africa, South Asia, and East Asia, as well as the decreased precipitation over subtropical North Africa, Japan, and North America. In contrast, these features are less consistent with observations when simulated by BCC_CSM1.1. Regression analysis further indicates that surface temperature anomalies over the North Pacific and the southern and western flanks of the Tibetan Plateau are reasonably reproduced by BCC_CSM1.1(m), which contributes to the substantial improvement in the simulation of the characteristics of summer APO compared to that of BCC_CSM1.1.

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Correspondence to Yaocun Zhang.

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Zhang, Y., Liao, Z., Zhang, Y. et al. Characteristics of the Asian–Pacific oscillation in boreal summer simulated by BCC_CSM with different horizontal resolutions. Adv. Atmos. Sci. 33, 1401–1412 (2016). https://doi.org/10.1007/s00376-016-5266-0

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  • DOI: https://doi.org/10.1007/s00376-016-5266-0

Keywords

  • Asian–Pacific Oscillation
  • BCC_CSM
  • horizontal resolution
  • simulation