Page 54 - 《高原气象》2022年第6期
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6 期 谭 赢等:中国冬季大范围持续性低温事件低频特征及其与大气低频振荡的联系 1417
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图8 三类事件过程中850 hPa低频(10~30天)风场(矢量,单位:m·s )、850 hPa低频温度场(阴影,单位:C)和
北风风速轴(大于6 m·s 等值线,单位:m·s )合成场的演变
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打点区表示温度场通过置信水平90%的显著性检验,A、C分别表示低频反气旋和气旋
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Fig. 8 The composite fields of UV850 hPa(vector,unit:m·s )and T850 hPa(shaded areas,unit:C)10~30 d field
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and north wind velocity axis(greater than 6 m·s ,unit:m·s )in the process of the three types of events.
The dotted areas indicate that the temperature fields pass the significant test at the 90%
confidence level. A:low-frequency anticyclone;C:low-frequency cyclone
图9 三类事件过程中500 hPa位势高度低频(10~30 d)合成场(阴影,单位:gpm)、实况合成场(等值线,单位:gpm)的演变
打点区表示通过90%的显著性检验
Fig. 9 The composite fields of H500 hPa 10~30 d field(the shaded,unit:gpm)and unfiltered field(contour,unit:gpm)
in the process of the three types of events. The dotted areas passed the confidence level at 90%
的低频正异常带维持并略有南移,巴湖-贝湖间的 (2)在全国类和东部类事件中,贝湖南侧均有
高压脊持续偏强,呈东北-西南向。 低频横槽存在,冷空气在横槽内堆积,但横槽的纬