Recent Intensified Winter Coldness in the Mid-High Latitudes of Eurasia and Its Relationship with Daily Extreme Low Temperature Variability

Figure 10

The spatial distribution of the first two leading modes of the extratropical Z1000 in the Northern Hemisphere and their associated circulation anomalies. (a, d) are for EOF1 and its corresponding ZPC1 and (b, e) are EOF2 and ZPC2, respectively. The units are gpm for Z1000 in (a, d). (c) The regression coefficients of SAT and Z1000 in relation to ZPC1 + ZPC2. (f) The units are gpm for Z1000 and K for SAT. Dashed lines in (d, e, f) denote the corresponding 9-yr running mean for the original time series (solid line). The dotted areas in (c) indicate significantly regressed SAT exceeding 0.05 for the -test.

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