期刊
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
卷 118, 期 5, 页码 2169-2183出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/jgrd.50236
关键词
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资金
- FP7 project [FP7-PEOPLE-IEF-2008/237461]
- Finnish Academy [258165, 265005, 128261]
- UK Natural Environment Research Council (NERC) [NE/I010173/1]
- New Zealand Marsden Fund
- NERC [bas0100023, NE/I010173/1] Funding Source: UKRI
- Academy of Finland (AKA) [128261, 128261] Funding Source: Academy of Finland (AKA)
- Natural Environment Research Council [bas0100023, NE/I010173/1] Funding Source: researchfish
We analyzed ERA-40 and ERA Interim meteorological re-analysis data for signatures of geomagnetic activity in zonal mean zonal wind, temperature, and Eliassen-Palm flux in the Northern Hemisphere extended winter (November-March). We found that for high geomagnetic activity levels, the stratospheric polar vortex becomes stronger in late winter, with more planetary waves being refracted equatorward. The statistically significant signals first appear in December and continue until March, with poleward propagation of the signals with time, even though some uncertainty remains due to the limited amount of data available (similar to 50 years). Our results also indicated that the geomagnetic effect on planetary wave propagation has a tendency to take place when the stratosphere background flow is relatively stable or when the polar vortex is stronger and less disturbed in early winter. These conditions typically occur during high solar irradiance cycle conditions or westerly quasi-biennial oscillation conditions.
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