A review of the late pleistocene-holocene climatic and paleoecological records in Tanzania
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Date
2019
Journal Title
Journal ISSN
Volume Title
Publisher
International Journal of Sciences: Basic and Applied Research (IJSBAR)
Abstract
Climate change is poorly addressed in the developing countries particularly in tropical East Africa such as
Tanzania. This paper aimed to reconstruct the late Pleistocene to Holocene Tanzanian climate change using
proxies from terrestrial and marine environment. Although data are limited, the inferred major events were
found to have a link with global events. In late Pleistocene, during the Last Glacial Maximum (LGM), Tanzania
experienced aridity as the other areas in the tropics. This was followed by the humid high precipitation period,
highly pronounced between 9-6 ka. Proxies indicate that the humid period was interrupted by a brief dry
Younger Dryas (YD) around 13.0-11.5 ka and a cool dry event at 8.2 ka. Other remarkable events are the cool
event in the mid Holocene at 5.2 ka and the global dry event at 4.0 ka. There is a general decrease in
precipitation from 5 ka to present with the aridity being pronounced between 3-2 ka and 1.2-0.5 ka. Despite of
relatively low precipitation in Late Holocene, wet conditions are inferred between 1.7-1.2 ka (being interrupted
by remarkable episodes of aridity) and the late periods of the 19 th and 20 th centuries. The 20 th century which is
marked by increased temperature is likely to cause changes in hydrological circle leading to the increase in
heavy rainfall and drought periods. Through this study, it is revealed that works are limited and concentrated in
some specific areas within the country which exhibit different climatic condition. As a result, some proxies
particularly from Eastern Arc Mountains show contradicting records and, in some places, interpretation is partial
due to extrapolation of the proxies which are not widely distributed within a specific climate zone.
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Keywords
Climate change, Paleoecology, Holocene, Proxies, Pleistocene, Tanzania