Fig. 4: Responses of the upper-level (200-hPa) wind to changes in the 30-year mean of ZE200 anomaly index and XAER, XGHG single-forcing run in the CESM1. | npj Climate and Atmospheric Science

Fig. 4: Responses of the upper-level (200-hPa) wind to changes in the 30-year mean of ZE200 anomaly index and XAER, XGHG single-forcing run in the CESM1.

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

Fig. 4

a The 30-year mean (1991–2020) of U-wind (units: \({\rm{m}}{{\rm{s}}}^{-1}\)) climatology (contour) and anomaly (shading) from NCEP-NCAR R1, the mean of CESM1-LE 40 members, XAER (Fixed anthropogenic aerosol forcing in 1920) 20 members, and XGHG (Fixed anthropogenic GHG forcing in 1920) 20 members in boreal winter (DJF). b Difference of 200 hPa geopotential height anomaly versus latitudinal jet core difference (northern part of 200 hPa zonal wind anomaly) from the CESM1-LE 40 members (blue mark) with linear regressed line (dotted black). The calculated values from NCEP-NCAR reanalysis 1 are indicated by red crosses. The jet difference was calculated by the weighted area average from the north part of the jet core (\({{30}^{^\circ } \sim 45}^{^\circ }N,{{120}^{^\circ } \sim 160}^{^\circ }E).\)The base period for the anomaly is 1951 to 2010. The Correlation coefficient (r) quoted in (b) is statistically significant at the 95% confidence level (*).

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