全新世期间亚洲和非洲干旱区环境的短尺度变化

doi:10.7605/gdlxb.1999.01.007

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Abstract

A preliminary comparison between the climatic evolution of the arid regions in North Africa andNorth China showed that the variations in the continental aridity on time scales of 104 years wereapproximately synchronous over the last 140 ka BP. Whether this relationship can be established for the Holocene drought events at centuryscale reported from tropical and equatorial Africa is still poorly known. Based on 569 reliable radiocarbon dates from surface fresh water indicators from the Sahara and 158 dates on palaeosol and lake sediments from the arid regions in North China, we demonstrate here that the Holocene environments in both regions have been affected by several approximately in phase arid events, inlaid in the slow trends attributable to the orbital forcing. The variations of the southern margins of the deserts, probably associated with the oscillations of the meteorological equator (or ITCZ) in Africa and with the northern monsoon front in China, are documented by the latitudinal distribution of these indicators through time. The most startling aspects are the severe interval at 4 000 years BP and a prolonged drier interval around 6 000 years BP. The last is given as the Holocene Optimum. However, this episode is in agreement with an important number of pollen, icecore, lacustrine and pacific eolian dust records, and also with the lower atmospheric methane concentration recorded in the GRIP icecore. The existence of this arid interval at low latitudes cannot be explained by higher evapotranspiration in the mid－Holocene, but is attributable to the weakening of the summer monsoon circulation.

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Published: 01 February 1999

About author: Guo Zhengtang, male, born in 1964, graduated from the Department of Geodynamics, University of Paris VI in 1990, and obtained the Ph.D.degree. Now he is a professor of the Institute ofGeology, Chinese Academy of Sciences, and engages in environmental and Quaternary geology.

Cite this article:

. HOLOCENE ABRUPT ENVIRONMENTAL CHANGES INTHE ARID REGIONS IN AFRICA AND ASIA[J]. JOURNAL OF PALAEOGEOGRAPHY, 1999, 1(1): 68-74.

. HOLOCENE ABRUPT ENVIRONMENTAL CHANGES INTHE ARID REGIONS IN AFRICA AND ASIA[J]. JOPC, 1999, 1(1): 68-74.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.1999.01.007 OR http://journal09.magtechjournal.com/gdlxb/EN/Y1999/V1/I1/68

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