Winter temperature (red solid curve) increases over past decades. Within the study period (1989–2021), the number of extreme cold days (blue solid line) in North China increases around the year 2003 and then decreases around the year 2013. The dashed li (IMAGE)

Institute of Atmospheric Physics, Chinese Academy of Sciences

Winter temperature (red solid curve) increases over past decades. Within the study period (1989–2021), the number of extreme cold days (blue solid line) in North China increases around the year 2003 and then decreases around the year 2013. The dashed li

Caption

Winter temperature (red solid curve) increases over past decades. Within the study period (1989–2021), the number of extreme cold days (blue solid line) in North China increases around the year 2003 and then decreases around the year 2013. The dashed lines are 5-year-smoothed data.

Credit

ZHU Yali

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