Teleconnection Patterns related to climate over Japan (JRA-55)

May 24th, 2018
Yuta Ando (Mie University)
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500-hPa Geopotential Height Regression Map (Northern Hemisphere)
The contours show 500-hPa geopotential height anomalies estimated by a regression with the SATs_EOF index as the independent variable. The contour interval is 20 m (solid contours, positive; dotted contours, negative). The color shading indicates significant at the 90%, 95% and 99% levels (t-test). The vectors shown for the value of significant at 90% levels (t-test) and above.
850-hPa Air Temperature Regression Map (Northern Hemisphere)
The contours show 850-hPa air temperature anomalies estimated by a regression with the SATs_EOF index as the independent variable. The contour interval is 0.5 °C (solid contours, positive; dotted contours, negative). The color shading indicates significant at the 90%, 95% and 99% levels (t-test).
         

The definition of SATs EOF, Atmospheric SATs, and Residual SATs indices
1) We obtained the time coefficients of the EOF modes of SATs over Japan (SATs EOF index) during each 15-day mean period (1982-2015).
2) The geopotential height anomalies at 250 hPa (Z250) of atmospheric circulation patterns related to SATs over Japan is obtained by a regression with SATs EOF index as the independent variable during same each 15-day mean period.
3) The time series of “Atmospheric SATs index” is obtained by projecting interannual Z250 anomalies during each 15-day mean period from 1982 to 2015 onto the regression coefficients at Z250 regressed by SATs over Japan of same each 15-day mean period as follows,
4) The time series of “Residual SATs index” is obtained by subtracting Atmospheric index from SATs EOF index as follows,

Details are shown in Ando et al. (2015)
References
Ando, Y., M. Ogi and Y. Tachibana, 2015: Abnormal Winter Weather in Japan during 2012 Controlled by Large-Scale Atmospheric and Small-Scale Oceanic Phenomena, Monthly Weather Review, 143, 54-63. (Link)


Copyright (C) 2014 - Yuta Ando All Rights Reseved.
Mie University, Weather and Climate Dynamics Division, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan.