Journal
JOURNAL OF THE ATMOSPHERIC SCIENCES
Volume 74, Issue 5, Pages 1549-1559Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JAS-D-16-0065.1
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Funding
- National Natural Science Foundation of China [41375047, 91537213, 41675039, 41575057, 41475085]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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The Eliassen-Palm flux (EPF) and Plumb's wave activity flux (WAF) were computed, using ERA-Interim data, to analyze the influence of planetary wave 3 on a stratospheric sudden warming event from 17 February to 15 March 2005 (SSW05). It was found that 1) SSW05 consisted of three stages: a prior minor warming (MnW05), a late final warming (FW05), and a warming stagnation between MnW05 and FW05; 2) the wave 3 first decreased total upward EPFs by more than 30% at 100hPa, resulting in the warming stagnation, and then increased upward EPFs by greater than 50%, leading to FW05; and 3) the anomalies of wave-3 activity fluxes were associated with the pattern of Atlantic blocking high in the latter two stages. The interactions between the wave 3 and wave 1 partitioned the zonal upward channel of total wave activity fluxes from one longitudinal region into two longitudinal regions and affected SSW05.
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