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| Titel |
Vegetation response to the "African Humid Period" termination in Central Cameroon (7° N) – new pollen insight from Lake Mbalang |
| VerfasserIn |
A. Vincens, G. Buchet, M. Servant, ECOFIT Mbalang collaborators |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 6, no. 3 ; Nr. 6, no. 3 (2010-05-04), S.281-294 |
| Datensatznummer |
250003542
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| Publikation (Nr.) |
 copernicus.org/cp-6-281-2010.pdf |
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| Zusammenfassung |
| A new pollen sequence from the Lake Mbalang (7°19´ N, 13°44´ E, 1110 m a.s.l.)
located on the eastern Adamawa plateau, in Central Cameroon, is
presented in this paper to analyze the Holocene African Humid Period (AHP)
termination and related vegetation changes at 7° N in tropical Africa,
completing an important transect for exploring shifts in the northern margin
of the African Monsoon. This sequence, spanning the last 7000 cal yr BP,
shows that the vegetation response to this transitional climatic period was
marked by significant successional changes within the broad context of
long-term aridification. Semi-deciduous/sub-montane forest retreat in this
area is initially registered as early as ca. 6100 cal yr BP and modern
savannah was definitely established at ca. 3000 cal yr BP and stabilized at
ca. 2400 cal yr BP; but a slight forest regeneration episode is observed
between ca. 5200 and ca. 4200 cal yr BP. In this area with modern high
rainfall, increasing in the length of the dry season during the AHP
termination linked to a contraction of the northern margin of the
Intertropical Convergence Zone (ITCZ) from ca. 6100 cal yr BP onward,
probably associated with decreasing in cloud cover and/or fog frequency, has
primarily controlled vegetation dynamics and above all the disappearance of
the forested environment on the Adamawa plateau. Compared to previous
studies undertaken in northern tropical and Central Africa, this work
clearly shows that the response of vegetation to transitional periods
between climatic extremes such as the AHP termination might be different in
timing, mode and amplitude according to the regional climate of the study
sites, but also according to the stability of vegetation before and during
these climatic transitions. |
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