Interannual variation of East Asian Winter Monsoon and ENSO

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This paper examines the interannual variation of the East Asian winter monsoon and its relationship with EJSO based on the 1979-1995 NCEP/NCAR reanalysis. Two stratifications of cold surges are used. The first one, described as the conventional cold surges, indicates that the surge frequency reaches a urn one year after El Nino events. The second one, originated from the same region as the first, is defined as the maximum wind events near the South China Sea. The variation of this stratification of surges is found to be in good agreement with the South Oscillation Index (SOI). Low SOI (high SOI) ... continued below

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13 p.

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Zhang, Yi; Sperber, Kenneth R. & Boyle, James S. December 1, 1996.

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Description

This paper examines the interannual variation of the East Asian winter monsoon and its relationship with EJSO based on the 1979-1995 NCEP/NCAR reanalysis. Two stratifications of cold surges are used. The first one, described as the conventional cold surges, indicates that the surge frequency reaches a urn one year after El Nino events. The second one, originated from the same region as the first, is defined as the maximum wind events near the South China Sea. The variation of this stratification of surges is found to be in good agreement with the South Oscillation Index (SOI). Low SOI (high SOI) events coincide with years of low (high) surge frequency. The interannual variation of averaged meridional wind near the South China Sea and western Pacific is dominated by the South China Sea cold surges, and is also well correlated (R--O.82) with the SOI. Strong wind seasons are associated with La Nina and high SOI events; likewise, weak wind years are linked with El Nino and low SOI cases. This pattern is restricted north of the equator within the region of (OON-20 N, 11OOE-1300E), and is confined to the near surface layer. The surface Siberian high, 500 hPa trough and 200 hPa jetstream, all representing the large-scale monsoon flow, are found to be weaker than normal during El Nino years. In particular, the interannual variation of the Siberian high is in general agreement with the SOL.

Physical Description

13 p.

Notes

OSTI as DE98051562

Other: FDE: PDF; PL:

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  • 3. conference on East Asian and Western Pacific meteorology and climate, Chungli (Taiwan, Province of China), 16-18 May 1996

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  • Other: DE98051562
  • Report No.: UCRL-JC--124645-Rev.1
  • Report No.: CONF-9605138--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 598881
  • Archival Resource Key: ark:/67531/metadc692088

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  • December 1, 1996

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 10, 2017, 1:28 p.m.

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Zhang, Yi; Sperber, Kenneth R. & Boyle, James S. Interannual variation of East Asian Winter Monsoon and ENSO, article, December 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc692088/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.