The last 140 ka in the Afro-Asian arid/semi-arid transitional zone

Zeng, Yan; Petit-Maire, Nicole

doi:10.1016/0031-0182(94)90085-x

Cited by 139 publications

(49 citation statements)

References 58 publications

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“…The CCSM3 Holocene simulation does not include predictive vegetation, which has been shown in some models to act as a positive feedback improving the simulation of Holocene precipitation over North Africa (Levis et al, 2005). At LGM, CCSM3 predicts drying and a reduced summer monsoon over tropical and northern Africa in agreement with proxy records of a desert extension further south (Yan and Petit-Maire, 1994;Prentice et al, 2000).…”

Section: Precipitationsupporting

confidence: 58%

Last Glacial Maximum and Holocene Climate in CCSM3

et al. 2006

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Section: Precipitationsupporting

confidence: 58%

Last Glacial Maximum and Holocene Climate in CCSM3

et al. 2006

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“…Annual rainfall is provided primarily by the Ž . Asian summer monsoon Zhang and Lin, 1987 . In both regions, the Holocene contraction and extension of the deserts are documented by a limited number of continuous records and a large amount of Ž scattered data Zhu, 1980;Petit-Maire et al, 1993;. Yan and Petit-Maire, 1994 .…”

Section: General Framework Rationale and Methodsmentioning

confidence: 99%

Holocene non-orbital climatic events in present-day arid areas of northern Africa and China

Guo

Petit-Maire²,

Kröpelin

2000

Global and Planetary Change

122

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A preliminary comparison between the climatic evolution of the arid regions in northern Africa and northern China showed that the variations in continental aridity, on time scales of 10 4 years, were roughly synchronous over the last 140 ka. Whether this relationship can be established for the Holocene drought events on a century-scale, as reported for tropical and equatorial Africa, is still not known. The comparison of 560 radiocarbon dates on surface fresh water indicators from the Sahara with 158 dates on palaeosols and lake sediments from the arid regions in northern China demonstrates that the Holocene humid phase has been affected in both regions by several drier events, inlaid in the slow trend attributable to orbital forcing. The variations of the southern margins of the deserts, associated with the northern monsoon front, are documented by the latitudinal distribution of these indicators through time. The most startling aspects are a prolonged somewhat drier interval between 7000 and 5600 years BP and the onset of severe aridity at c. 4000 years BP similar to glacial conditions. q

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“…There is currently no clear evidence (Adams, 1997) and Asian (Winkler and Wang, 1993;Jiang and Liu, 2007) summer monsoon fringe during the middle to early Holocene. The blue dashed line is the estimated Asian and North African monsoon fringe during the Last Glacial Maximum (Yan and Petit-Maire, 1994).…”

Section: Abrupt Vs Gradual Changes: the Holocene Historymentioning

confidence: 99%

The global monsoon across timescales: coherent variability of regional monsoons

et al. 2014

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Abstract. Monsoon has earned increasing attention from the climate community since the last century, yet only recently have regional monsoons been recognized as a global system. It remains a debated issue, however, as to what extent and at which timescales the global monsoon can be viewed as a major mode of climate variability. For this purpose, a PAGES (Past Global Changes) working group (WG) was set up to investigate the concept of the global monsoon and its future research directions. The WG's synthesis is presented here. On the basis of observation and proxy data, the WG found that the regional monsoons can vary coherently, although not perfectly, at various timescales, varying between interannual, interdecadal, centennial, millennial, orbital and tectonic timescales, conforming to the global monsoon concept across timescales. Within the global monsoon system, each subsystem has its own features, depending on its geographic and topographic conditions. Discrimination between global and regional components in the monsoon system is a key to revealing the driving factors in monsoon variations; hence, the global monsoon concept helps to enhance our understanding and to improve future projections of the regional monsoons. This paper starts with a historical review of the global monsoon concept in both modern and paleoclimatology, and an assessment of monsoon proxies used in regional and global scales. The main body of the paper is devoted to a summary of observation data at various timescales, providing evidence of the coherent global monsoon system. The paper concludes with a projection of future monsoon shifts in a warming world. The synthesis will be followed by a companion paper addressing driving mechanisms and outstanding issues in global monsoon studies.

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The last 140 ka in the Afro-Asian arid/semi-arid transitional zone

Cited by 139 publications

References 58 publications

Last Glacial Maximum and Holocene Climate in CCSM3

Last Glacial Maximum and Holocene Climate in CCSM3

Holocene non-orbital climatic events in present-day arid areas of northern Africa and China

The global monsoon across timescales: coherent variability of regional monsoons

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