Fig. 2: Variation of the ZE200 during the northern winter (DJF) season and comparison with the corresponding correlation between PNA and NAWD. | npj Climate and Atmospheric Science

Fig. 2: Variation of the ZE200 during the northern winter (DJF) season and comparison with the corresponding correlation between PNA and NAWD.

From: Evolving winter atmospheric teleconnection patterns and their potential triggers across western North America

Fig. 2

a The winter (DJF) mean of ZE200 (units: m) climatology (contour) and anomaly (shading) for a 30-year period starting from 1951 and for T1, T2, and T3. The base period is from 1951 to 2010. b As in (a), but for standard deviation (shading) and anomaly (units: m), repeated from a, is shown in contour. c The time series for the 30-year mean of the ZE200 anomaly index during winter from multi-reanalysis data. The winter (DJF) mean of the ZE200 anomaly index is made by 5° × 5° area average from the high-pressure anomaly center (55°N, 115°W, red line). d Recalculate the 30-year sliding correlation from multi-reanalysis data. The Linear trend is removed, and the winter (DJF) mean is applied in advance. The significance at the 99% (black) levels is shown by the dotted line.

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