Title: Using the physical decomposition methodto study the effects of Arctic factors on wintertime temperatures in the Northern Hemisphere and China.
Abstract: The physical decomposition method separates atmospheric variables into four parts, correlating each with solar radiation, land-sea distribution, and inter-annual and seasonalinternal forcing, strengthening the anomaly signal and increasing the correlation between variables.This method was applied to the reanalysisdata from the National Centers for Environmental Prediction/National Centerfor Atmospheric Research (NC EP/NCAR), to study the effects of Arctic factors (Arctic oscillation (AO) and Arctic polar vortex) on wintertime temperatures in the NorthernHemisphere and China.It was found that AO effectson zonal average temperature disturbance could persist for 1 month. In the AO negative phase in wintertime, the temperatures are lower in the mid-high latitudesthan in normal years, but higher in low latitudes.When the polar vortex area is bigger, the zonal average temperature is lower at50°N. Influenced mainly by meridional circulation enhancement, cold air flows from high to low latitudes; thus, the temperatures in Continental Europe and the North American continent exhibit an antiphaseseesaw relationship. When theAO is in negative phase and the Arcticpolar vortex larger, the temperature is lowerin Siberia, but higher in Greenland and the Bering Strait. Influenced by westerlytroughs and ridges, the polar air dispersesmainly along the tracks of atmospheric activity centers. The AO index can be considered a predictor of wintertime temperature in China. When the AO is in negative phase or the Asian polar vortex is intensified, temperatures in Northeast China and Inner Mongolia are lower, because under the influenceof the Siberia High and northeast cold vortex, the cold air flows southwards.
Publication Year: 2014
Publication Date: 2014-01-25
Language: en
Type: article
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Cited By Count: 4
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