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�ꡡ�ܡ��̶˰�α��ʳءʤ��Σ������Ҳ��
ȯɽ�ԡ�Wang Yafei (Professor, Chinese
Academy of Meteorological Sciences)
�ꡡ�ܡ�The Interaction of the Two Different
Propagation Direction of the Planetary Wave:
A Possible Cause of the
Anomalous Southern Location of the Western Subtropical High
in Boreal Summer of 1998
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The Interaction of the Two Different Propagation Direction of the
Planetary Wave:
A Possible Cause of the Anomalous Southern Location
of the Western Subtropical High
in Boreal Summer of 1998 (Wang Yafei ) ȯɽ�� :
Chinese Academy of Meteorological Sciences, 100081, Beijing, China Abstract This study discussed the two teleconnection patterns and their related wave train propagations which often occur in East Asian summer. One is the wave train propagation originated from the Lake of Baikal, passing the Okhotsk Sea through the sea area east of Japan towards subtropical regions (here after WFP) as pointed out by Wang (1992), the other arise from the Philippines via the sea area east of Japan to North America (here after NTP) as shown by Nitta (1987) and Kurihara and Tsuyuki (1987). Current results are as follows: (1) Although WFP tends to occur in early summer, and NTP in late summer, they are sometimes generated simultaneously. (2) WFP propagation is apt to occur with the development of the Okhotsk High, but difficultly occur in opposite situation. One the other hand, the Rossby wave starting from Philippines towards North Pole could strongly propagate in both phase. It is excited not only by the convective activity around the Philippines as shown by Nitta (1987), but also propagates with the opposite phase that may be generated by other exciting process. In latter situation, the negative geopotential height anomaly over sea area east of Japan may be formed with the Rossby wave propagation. (3) The resonance will sometimes happen when WYP meet the NTP with the opposite phase of the P-J pattern over the sea area east of Japan. This resonance may result in a cyclonic circulation deepened in situ. This kind of interaction between the two waves is one of the important reasons why the west pacific subtropical high could keep its main body in further southern area than usual in 1998 summer.
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