Fig. 6: Composite wave activity flux (WAF) and 200hPa geopotential height (Z200) anomalies. | npj Climate and Atmospheric Science

Fig. 6: Composite wave activity flux (WAF) and 200hPa geopotential height (Z200) anomalies.

From: The synergistic effect of the North Pacific and the North Tropical Atlantic sea surface temperature on winter–spring cold events in Eastern North America

Fig. 6

Composite WAF (vectors; unit: m2 s–2) and Z200 (shading; unit: m) anomalies for (a) the joint events of pVM and nNTA (pVM & nNTA). b As in (a) but for the single nNTA events (nNTA\pVM). c Regressed anomalous WAF (vectors; unit: m2 s–2) and Z200 (shading; unit: m) with respect to the VM index. In (a–c), contours and vectors indicate the values significant at the 95% confidence level. d As in (c), but for Rossby wave source (RWS; shading; unit: 3 × 10–10 s–2). The climatological 200-hPa zonal winds (contours; unit: m s–1) obtained by the DJFMAM-averaged 200-hPa zonal winds during 1981–2010 are also presented.

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