On the long-term interannual variability of the east Asian winter monsoon

The East Asian Winter Monsoon (EAWM) and Siberian High (SH) are inherently related, based on prior studies of instrumental data available for recent decades (since 1958). Here we develop an extended instrumental EAWM index since 1871 that correlates significantly with the SH. These two indices show...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: D'Arrigo, R, Wilson, Rob, Panagiotopoulos, F, Wu, B Y
Format: Article in Journal/Newspaper
Language:English
Published: 2005
Subjects:
PART II
PACIFIC
TELECONNECTION
OSCILLATION
RAINFALL
CLIMATE
SUMMER
Pacific
aleutian low
Online Access:https://risweb.st-andrews.ac.uk/portal/en/researchoutput/on-the-longterm-interannual-variability-of-the-east-asian-winter-monsoon(8f1ef785-27e1-48a8-a2e5-37cd6bf3ec28).html
https://doi.org/10.1029/2005GL023235
Description
Summary:The East Asian Winter Monsoon (EAWM) and Siberian High (SH) are inherently related, based on prior studies of instrumental data available for recent decades (since 1958). Here we develop an extended instrumental EAWM index since 1871 that correlates significantly with the SH. These two indices show common modes of variation on the biennial (2-3 year) time scale. We also develop an index of the pressure gradient between the SH and the Aleutian Low, a gradient which critically impacts EAWM variability. This difference series, based on tree-ring reconstructions of the SH and the North Pacific Index (NPI) over the past 400 years, shows that the weakening of this gradient in recent decades has not been unusual in a long-term context. Correlations between the SH series and a tree-ring reconstruction of the El Nino-Southern Oscillation (ENSO) suggest a variable tropical-higher latitude teleconnection.

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