Arid
DOI10.5194/cp-11-751-2015
Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)
Bouimetarhan, I.1; Dupont, L.; Kuhlmann, H.; Paetzold, J.; Prange, M.; Schefuss, E.; Zonneveld, K.
通讯作者Bouimetarhan, I.
来源期刊CLIMATE OF THE PAST
ISSN1814-9324
EISSN1814-9332
出版年2015
卷号11期号:5页码:751-764
英文摘要

In tropical eastern Africa, vegetation distribution is largely controlled by regional hydrology, which has varied over the past 20 000 years. Therefore, accurate reconstructions of past vegetation and hydrological changes are crucial for a better understanding of climate variability in the tropical southeastern African region. We present high-resolution pollen records from a marine sediment core recovered offshore of the Rufiji River delta. Our data document significant shifts in pollen assemblages during the last deglaciation, identifying, through changes in both upland and lowland vegetation, specific responses of plant communities to atmospheric (precipitation) and coastal (coastal dynamics and sea-level changes) alterations. Specifically, arid conditions reflected by a maximum pollen representation of dry and open vegetation occurred during the Northern Hemisphere cold Heinrich event 1 (H1), suggesting that the expansion of drier upland vegetation was synchronous with cold Northern Hemisphere conditions. This arid period is followed by an interval in which forest and humid woodlands expanded, indicating a hydrologic shift towards more humid conditions. Droughts during H1 and the shift to humid conditions around 14.8 kyr BP in the uplands are consistent with latitudinal shifts of the intertropical convergence zone (ITCZ) driven by high-latitude Northern Hemisphere climatic fluctuations. Additionally, our results show that the lowland vegetation, consisting of well-developed salt marshes and mangroves in a successional pattern typical for vegetation occurring in intertidal habitats, has responded mainly to local coastal dynamics related to marine inundation frequencies and soil salinity in the Rufiji Delta as well as to the local moisture availability. Lowland vegetation shows a substantial expansion of mangrove trees after similar to 14.8 kyr BP, suggesting an increased moisture availability and river runoff in the coastal area. The results of this study highlight the de-coupled climatic and environmental processes to which the vegetation in the uplands and the Rufiji Delta has responded during the last deglaciation.


类型Article
语种英语
国家Germany
收录类别SCI-E
WOS记录号WOS:000357121100004
WOS关键词HOLOCENE MANGROVE DYNAMICS ; LAST GLACIAL MAXIMUM ; SEA-LEVEL ; RAINFALL SEASONALITY ; INDIAN-OCEAN ; NW AFRICA ; HEINRICH EVENTS ; POLLEN RECORD ; DIPOLE MODE ; CLIMATE
WOS类目Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS研究方向Geology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186527
作者单位1.Univ Bremen, MARUM Ctr Marine Environm Sci, D-28334 Bremen, Germany;
2.Univ Bremen, Dept Geosci, D-28334 Bremen, Germany
推荐引用方式
GB/T 7714
Bouimetarhan, I.,Dupont, L.,Kuhlmann, H.,et al. Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)[J],2015,11(5):751-764.
APA Bouimetarhan, I..,Dupont, L..,Kuhlmann, H..,Paetzold, J..,Prange, M..,...&Zonneveld, K..(2015).Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania).CLIMATE OF THE PAST,11(5),751-764.
MLA Bouimetarhan, I.,et al."Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)".CLIMATE OF THE PAST 11.5(2015):751-764.
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