Fig. 4: Large-scale atmospheric conditions associated with the CP ENSO. | npj Climate and Atmospheric Science

Fig. 4: Large-scale atmospheric conditions associated with the CP ENSO.

From: Change of the CP ENSO’s role in the occurrence frequency of Arctic daily warming events triggered by Atlantic storms

Fig. 4

Anomalies of 500 hPa geopotential height (colored, interval: 6, units: m; a, b) and horizontal wind (vector, units: m s−1; a, b) in DJF obtained by regression on the DJF EMI index, as well as wave activity flux (horizontal component units: m2 s−2; vertical component units: Pa m s−2; vectors; c, d) and its divergence (contour, interval: 4, units: m s−1 d−1; c, d) and 50 hPa geopotential height (colored, interval: 10, units: m; e f) in NDJ obtained by regression on the NDJ EMI index during 1957–1985 (P1; a, c and e) and 1986–2018 (P2; b, d and f), respectively. In a, b, only vectors with meridional component anomalies at the significance level of p < 0.05 are shown, and the dashed purple boxes mark the region (60°–90°N, 30°W–20°E). In c, d, red (blue) contours denote positive (negative) values, and only vectors exceeding 0.1 are shown. The dots in (a), (b), (e) and (f) represent geopotential height anomalies at the significance level of p < 0.05; the gray areas in (c) and (d) represent wave activity flux with vertical component anomalies at the significance level of p < 0.05.

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