Located in East Asia region, China experiences anomalous climate which is dominated by the monsoon variability. While there are a number of studies concerning the East Asian summer monsoon, this is not true for the winter monsoon. One reason may be that the strength and timing of the summer monsoon can cause drought and flooding, which have a strong impact on economy, including industry and agriculture, and daily life of the people. Of course, the winter monsoon is much less important for food production. However, variability of the winter monsoon in East Asia is connected with strong temperature differences, what is essential e.g. for energy consumption. The causes of climate variability over East Asia are complex, since there are many influence factors (Huang et al., 2003). Basically, these factors can be sorted into the external forcing and the internal dynamical progress in the atmosphere. There have been, so far, a considerable number of researches on the interannual climatic variations over East Asia associated with the external factors, particularly associated with the El Ni?o/Southern Oscillation (ENSO). However, few studies have been devoted to those associated with internal factors. Recently work of Chen et al. (2003) had found two independent oscillations for planetary wave activity in the troposphere and stratosphere, respectively. Here, we examined the relationship of the tropospheric stationary planetary wave activity in the northern winter to the climate variability over East Asia.
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