Investigations on variations of the subtropical high in the Western Pacific during historic times

✍ Scribed by Huang Jia-You; Wang Shao-Wu

• Publisher: Springer
• Year: 1985
• Tongue: English
• Weight: 723 KB
• Volume: 7
• Category: Article
• ISSN: 0165-0009
• DOI: 10.1007/bf00139057

✦ Synopsis

In this paper the 500 mb circulation field over East Asia was reconstructed by means of a stepwise regression technique, based on the relationship between summer (June to August) rainfall in China and 500 mb level heights. As a resu][t of this study, three indices for the subtropical high, the longitude of the west boIder, and the latitude of the north border and intensity for the period AD 1471-1980 were extracted from reconstructed 500 mb level heights.

The power spectrum analysis was carried out to investigate the variation of subtropical high indices for last 500 yr; it is shown that the prominentcycles are 22-, 36-, 55-yr and the quasi-biennial oscillation (QBO), among these the latter is more significant.

The long-term variations of the 10 yr average 500 mb level heights and subtropical high indices are examined in relation to climate change; it was determiEned that the longitudinal variation of subtropical high plays an important role in the wetness variations over China.