Northeast and Northwest China sometimes experienced opposite winter temperature anomalies. What are their respective preceding factors?

Citation: Xin, Y.-F, G. Liu, and Q.-H. Jin, 2014: Individual variations of winter surface air temperature over Northwest and Northeast China and their respective preceding factors,？Atmos. Oceanic Sci. Lett., 7, doi:10.3878/j.issn.1674-2834.14.0010.

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Anomalies of (a) winter 500-hPa geopotential height (gpm), (c) 200-hPa winds (m s^？1), and (e) surface winds (m s^？1) regressed by the previous autumn TLB index; (b), (d), and (f) the same as (a), (b), and (c), except for the regressions on the previous autumn TMP index. Shading denotes that the regressed coefficients of geopotential height or wind speed are at the 95% confidence level.