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NCDC: Rainfall and drought in equatorial east Africa during the past 1,100 years (fig. 2)
Entry ID: NCDC_RainfallDroughtEastAfrica1100yrs2
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Summary
Abstract: Knowledge of natural long-term rainfall variability is essential for water-resource and land-use management in sub-humid regions of the world. In tropical Africa, data relevant to determining this variability are scarce because of the lack of long instrumental climate records and the limited potential of standard high-resolution proxy records such as tree rings and ice cores. Here we present a decade-scale reconstruction of rainfall and drought in equatorial east Africa over the past 1,100 years, based on lake-level and salinity fluctuations of Lake Naivasha (Kenya) inferred from three different palaeolimnological proxies: sediment stratigraphy and the species compositions of fossil diatom and midge assemblages. Our data indicate that, over the past millennium, equatorial east Africa has alternated between contrasting climate conditions, with significantly drier climate than today during the 'Medieval Warm Period' (~AD 1000-1270) and a relatively wet climate during the 'Little Ice Age' (~AD 1270-1850) which was interrupted by three prolonged dry episodes. We also find strong chronological links between the reconstructed history of natural long-term rainfall variation and the pre-colonial cultural history of east Africa, highlighting the importance of a detailed knowledge of natural long-term rainfall fluctuations for sustainable socio-economic development.

Credit: Dirk Verschuren, Kathleen R. Laird, Brian F. Cumming and NOAA Paleoclimatology Program.
Related URL
Link: GET DATA
Description: WDC Paleo Archive
ISO Topic Category
CLIMATOLOGY/METEOROLOGY/ATMOSPHERE
GEOSCIENTIFIC INFORMATION
OCEANS
Project
ESIP >Earth Science Information Partners Program   [Information]
Keywords
Climate Diagnostics
Personnel
NOAA_PALEOCLIMATOLOGY_PROGRAM
Role: TECHNICAL CONTACT
Phone: 303-497-6280
Fax: 303-497-6513
Email: paleo at noaa.gov
Contact Address:
NOAA Paleoclimatology Program
325 Broadway, Code E/CC23
City: Boulder
Province or State: CO
Postal Code: 80305-3328
Country: USA
Publications/References
Dirk Verschuren, Kathleen R. Laird and Brian F. Cumming, Rainfall and drought in equatorial east Africa during the past 1,100 years, Nature, No.6768, v403, pp.410-414, January 27, 2000
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