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AGU: Geophysical Research Letters

 

Keywords

  • decadal
  • NAO
  • cold surge

Index Terms

  • Atmospheric Processes: Climate change and variability
  • Oceanography: General: Climate and interannual variability
  • Global Change: Climate variability
  • Atmospheric Processes: Synoptic-scale meteorology
  • Global Change: Climate dynamics

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 35, L24707, 6 PP., 2008
doi:10.1029/2008GL034766

Decadal relationship between the North Atlantic Oscillation and cold surge frequency in Taiwan

Chi-Cherng Hong

Department of Science, Taipei Municipal University of Education, Taipei, Taiwan

Huang-Hsiung Hsu

Department of Atmospheric Science, National Taiwan University, Taipei, Taiwan

Hsin-Hsing Chia

Central Weather Bureau, Taipei, Taiwan

Cheng-Ying Wu

Department of Science, Taipei Municipal University of Education, Taipei, Taiwan

The close decadal relationship between the North Atlantic Oscillation (NAO) and the cold surge frequency in Northern Taiwan is identified. The cold surge frequency was higher (lower) in 1957–1977 (1981–2001), which corresponded to the negative (positive) phase of the NAO. The teleconnection pattern associated with the NAO suggests that the Siberian high, the ridge upstream of Lake Baikal and the East Asian trough, which are well-known circulation characteristics favorable for cold surge occurrences, were enhanced in the negative NAO phase. A weakened upper-level convergence over the Mediterranean-Sahara occurring in the negative NAO phase was associated with a wave-like pattern spreading toward East Asia along the subtropical jet stream. Barotropic modeling results suggest that the suppressed upper-level convergence in the Mediterranean-Sahara region may force a wave train emanating toward East Asia along the subtropical jet stream, which acts as a Rossby waveguide. The barotropic wave pattern may result in a stronger low-level northerly over subtropical East Asia and create a favorable background for the further southward penetration of cold air, and therefore more frequent cold surge occurrence. The same process may be applied to the period when the NAO is in the positive phase.

Received 22 May 2008; accepted 17 September 2008; published 31 December 2008.

Citation: Hong, C.-C., H.-H. Hsu, H.-H. Chia, and C.-Y. Wu (2008), Decadal relationship between the North Atlantic Oscillation and cold surge frequency in Taiwan, Geophys. Res. Lett., 35, L24707, doi:10.1029/2008GL034766.

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