过去5000年西太平洋副热带高压活动的泥炭纤维素碳同位素记录

文章以金川和红原两组泥炭纤维素Δδ13C时间序列值的反向变化来指示西太平洋副热带高压活动变化.结果表明,在过去5000年中,西太平洋副热带高压的活动可分为4个阶段,即西太平洋副热带高压位置在2800～2200B.C.期间持续偏北,2200～600B.C.期间持续偏南,600B.C.～1200A.D.期间在北进与南移之间频繁波动,以及1200～1900A.D.期间再次持续偏北,它们导致降雨量在中国大陆上不同的分布.从约1900A.D.起西太平洋副热带高压的活动似乎又开始一个新的偏南阶段,值得进一步加强研究.

SUBTROPICAL HIGH ACTIVITY OF WESTERN PACIFIC OCEAN DURING THE LAST 5 000 YEARS RECORDED IN ISOTOPE TIME SERIES OF PEAT BOG

An inverse correlation between the isotope time series of peat cellulose from Jinchuan and Hongyuan has been used for indicating the subtropical high activities of the Western Pacific Ocean. The results show that the subtropical high activities can be divided into four stages during the last 5 000 years. In the period from 2800 B.C. to 2200 B.C. the ridge line of subtropical high seems to tend to move to the north part of the China continent, which led to an increase precipitation in the region covering the northeastern China, the north China and the Yellow river basin; and at the same time caused a decrease precipitation in the region between the Changjiang and Huai rivers. On the contrary, during the period from 2200 B. C. to 600 B.C. the ridge line was in the south of China, which led to a decrease precipitation in Yellow river basin and so on, and at the same time caused an increase precipitation in the region between the Changjiang and Huai rivers. After walking back and forth between the north and south for around 1 800 years the subtropical high seems to move to the north again during the period from 1200 A.D. to 1900 A.D. What is worth to paying particular attention to is that from around 1900 A.D. the subtropical high seems to begin to move again to the south part of China continent, for which it remains to be studied further.