期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 2, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL097233
关键词
surface air temperature; intraseasonal oscillation; annual cycle; time-scale interaction
资金
- National Natural Science Foundation of China [41830969]
- National Key RD Program [2018YFC1505904]
- Basic Scientific Research and Operation Foundation of CAMS [2021Z004]
The large-scale cold and warm spells in North Asia have caused a subseasonal alternation of extreme surface air temperature. The synergistic effect of the annual cycle and intraseasonal oscillation of temperature and circulation anomalies is responsible for temperature extremes before and after mid-January 2021.
Large-scale cold and warm spells successively attacked North Asia (NA) and resulted in a subseasonal alternation of extreme surface air temperature (SAT) before and after 15 January 2021. Our results show the synergistic effect of annual cycle and intraseasonal oscillation component (AC and ISO) of SAT and circulation anomalies caused temperature extremes. Before 15 January 2021, an eastward-propagating Rossby wave train strengthened the cold circulation regime with an enhanced Ural blocking high (UBH) and surface Siberian high (SH). Circulation anomalies of the negative ISO were superimposed on the counterpart of AC, which easily resulted in cold extremes via nonlinear interaction of meridional temperature gradient. After mid-January 2021, however, weakened UBH and SH caused warm advection and spells over NA. This synergistic effect of AC and ISO anomalies in SAT accounted for most historical temperature extremes, implying that AC anomalies have important indications for subseasonal alternation of temperature extremes.
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