Theoretical and Applied Climatology

, Volume 124, Issue 3–4, pp 737–755 | Cite as

Tropical synoptic-scale wave disturbances over the western Pacific simulated by a global cloud-system resolving model

  • Yoshiki Fukutomi
  • Chihiro Kodama
  • Yohei Yamada
  • Akira T. Noda
  • Masaki Satoh
Original Paper

Abstract

Lower-tropospheric tropical synoptic-scale disturbances (TSDs) are associated with severe weather systems in the Asian Monsoon region. Therefore, exact prediction of the development and behavior of TSDs using atmospheric general circulation models is expected to improve weather forecasting for this region. Recent state-of-the art global cloud-system resolving modeling approaches using a Nonhydrostatic Icosahedral Atmospheric Model (NICAM) may improve representation of TSDs. This study evaluates TSDs over the western Pacific in output from an Atmospheric Model Intercomparison Project (AMIP)-like control experiment using NICAM. Data analysis compared the simulated and observed fields. NICAM successfully simulates the average activity, three-dimensional structures, and characteristics of the TSDs during the Northern summer. The variance statistics and spectral analysis showed that the average activity of the simulated TSDs over the western Pacific during Northern summer broadly captures that of observations. The composite analysis revealed that the structures of the simulated TSDs resemble the observed TSDs to a large degree. The simulated TSDs exhibited a typical southeast- to northwest-oriented wave-train pattern that propagates northwestward from near the equator around 150 E toward the southern coast of China. However, the location of the simulated wave train and wave activity center was displaced northward by approximately a few degrees of latitude from that in the observation. This displacement can be attributed to the structure and strength of the background basic flow in the simulated fields. Better representation of the background basic states is required for more successful simulation of TSDs.

Keywords

Tropical synoptic-scale wave disturbances Western Pacific Global cloud-system resolving model 

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Copyright information

© Springer-Verlag Wien 2015

Authors and Affiliations

  • Yoshiki Fukutomi
    • 1
  • Chihiro Kodama
    • 1
  • Yohei Yamada
    • 1
  • Akira T. Noda
    • 1
  • Masaki Satoh
    • 2
  1. 1.Japan Agency for Marine-Eath Science and Technology (JAMSTEC)YokohamaJapan
  2. 2.AORIUniversity of TokyoTokyoJapan

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