Abrupt Holocene changes of the Asian monsoon at millen-nial-and centennial-scales: Evidence from lake sediment document in Minqin Basin, NW China  

作　　者：CHEN Fahu ZHU Yan LI Jijun SHI Qi JIN Liya B.Wunemann 

机构地区：[1]National Laboratory of Western China’s Environmental Systems,Lanzhou University,Lanzhou 730000,China [2]College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China [3]South China Sea Institute of Oceanography,Chinese Academy of Sciences,Guangzhou 510301,China [4]Institute of Geographical Science,Department of Geosciences,Free University of Berlin,12249 Berlin,Germany

出　　处：《Chinese Science Bulletin》2001年第23期1942-1947,共6页

基　　金：This study was supported by the National Natural Science Foundation of China (Grant No. 49731010);the National Key Basic Research Project on Western Chinese Arid Areas (Grant No. G1999043501).

摘　　要：Considerable research is now focusing on abrupt Holocene changes at millennial- and centennial-scales all over the world. This study shows that the changes in theHolocene summer monsoon can be divided into two main periods, based on climatic proxy records of lake sediments from the Sanjiaocheng section located at the NW boundary of the summer monsoon, Gansu Province. The early and middle Holocene was humid with stronger summer monsoon, while the late Holocene is dry with weak summer monsoon. Detailed results also show a series of millennial- and centennial-scale changes in the intensity of the summer monsoon, with a periodicity of 1600 years during the whole Holocene, and with a periodicity of 800 years during the early Holocene. Ten dry events during the Holocene are associated with the weakening of the summer monsoon. These rapid climatic changes may be representative of a global climatic change pattern during the Holocene.Considerable research is now focusing on abrupt Holocene changes at millennial- and centennial-scales all over the world. This study shows that the changes in the Holocene summer monsoon can be divided into two main periods, based on climatic proxy records of lake sediments from the Sanjiaocheng section located at the NW boundary of the summer monsoon, Gansu Province. The early and middle Holocene was humid with stronger summer monsoon, while the late Holocene is dry with weak summer monsoon. Detailed results also show a series of millennial- and centennial-scale changes in the intensity of the summer monsoon, with a periodicity of {dy1600} years during the whole Holocene, and with a periodicity of 800 years during the early Holocene. Ten dry events during the Holocene are associated with the weakening of the summer monsoon. These rapid climatic changes may be representative of a global climatic change pattern during the Holocene.

关 键 词：HOLOCENE lake DOCUMENT rapid changes. 

分 类 号：P531[天文地球—古生物学与地层学]