Fig. 3: Mechanism by which the TSA–SST influences atmospheric circulation during MAM. | npj Climate and Atmospheric Science

Fig. 3: Mechanism by which the TSA–SST influences atmospheric circulation during MAM.

From: Interannual impact of tropical southern Atlantic SST on surface air temperature over East Asia during boreal spring

Fig. 3

a Regression of 200-hPa geopotential height (shading; unit: gpm) on the TSAI during MAM. Correlation coefficients between the TSAI and the 200-hPa horizontal wind (vectors) during MAM. Vectors exceeding the 0.05 significance level are shown. b Correlation of 200-hPa PV (shading) and regressed wave activity flux (vectors) on the TSAI during MAM. c Regression of CK and its components on the TSAI during MAM. Vectors are the same as those in (a). Based on Eq. (3), the subplot shows the energy diagnostics result averaged over the red dashed box. The blue and green lines indicate zonal winds exceeding 25 and 30 m/s, respectively. d Differences in 200-hPa geopotential height (contours) and horizontal wind (vectors) between the POS and NEG ensemble means during MAM. The dashed blue line indicates the Rossby wave train. Yellow shading indicates the zonal wind exceeding 25 m/s in the climate model. Areas exceeding the 0.05 significance level are highlighted by dots in (a) and (b). The thick blue line in East Asia denotes the boundary of the Tibetan Plateau topography with an elevation of 3000 m.

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