European Diatom Database-African Dataset
Entry ID: uk_nc_eddi_Africa

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Summary
Abstract: The European Diatom Database (EDDI) is a web-based information system designed
to enhance the application of diatom analysis to problems of surface water
acidification, eutrophication and climate change.

The East African dataset and North African dataset were harmonized to construct
a unified African data set. Transfer functions were developed from the
subsequent training set for inferring past conductivity (r2= 0.87), pH (r2=
0.77), and ratios between alkali and alkaline earth metals (r2 = 0.81) and
carbonate-bicarbonate and sulphate + chloride ions (r2 = 0,82) (Gasse et al.,
1995) and the model has subsequently been applied to several diatom sequences
to reconstruct lake chemistry (e.g. Fritz et al., 1999; Dagnachew et al., in
press ; Chalie and Gasse, in press ; Gasse, 2001 ; Gasse, in press ; Verschuren
et al., 2000 ).

Related URL
Link: GET DATA


Parent DIF
This data set description is a member of a collection. The collection is described in
uk_nc_eddi


Geographic Coverage
 N: 13.32 S: -1.72  E: 41.7  W: 2.32

Data Set Citation
Dataset Originator/Creator: Francoise Gasse
Dataset Title: European Diatom Database-African Dataset
Dataset Release Place: Newcastle upon Tyne, United Kingdom
Dataset Publisher: The University of Newcastle
Online Resource: http://craticula.ncl.ac.uk/Eddi/jsp/datasetdesc.jsp?DatasetId=Africa


Temporal Coverage
Start Date: 1960-01-01
Stop Date: 1986-12-31


Location Keywords
CONTINENT > AFRICA > EASTERN AFRICA > ETHIOPIA
CONTINENT > AFRICA > EASTERN AFRICA > KENYA
CONTINENT > AFRICA > WESTERN AFRICA > NIGER
CONTINENT > AFRICA > EASTERN AFRICA > UGANDA
CONTINENT > AFRICA
CONTINENT > AFRICA > EASTERN AFRICA > Ethiopia
CONTINENT > AFRICA > NORTHERN AFRICA


Science Keywords
TERRESTRIAL HYDROSPHERE >SURFACE WATER >LAKES >LAKEWATER CHEMICAL DATA    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >ALKALINITY    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CONDUCTIVITY    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >PH >LAKEWATER PH TRANSFER FUNCTION    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >TRACE METALS    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENT CHEMISTRY >SURFACE SEDIMENT SAMPLES    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENTS >SURFACE SEDIMENT SAMPLES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >DIATOMS    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >MICROALGAE >DIATOMS
BIOSPHERE >AQUATIC ECOSYSTEMS >LAKES    [Definition]


ISO Topic Category
BIOTA
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
INLAND WATERS


Quality
The East African and North African data sets have been harmonized to
construct a unified African data set.


Access Constraints
None


Use Constraints
None


Keywords
The European Diatom Database
surface-sediment diatom assemblages
surface water acidification
eutrophication
climate change
Plantae
Plant
Chromista
Bacillariophyta
alkalinity
calcium
chloride
conductivity
magnesium
maximum depth of lake
pH
potassium
salinity
silica
site surface area at time of sampling
sodium
sulphate
total phosphorus
water depth of diatom sample


Data Set Progress
COMPLETE


Data Center
European Diatom Database, University of Newcastle, UK    [Information]
Data Center URL: http://craticula.ncl.ac.uk/Eddi/jsp/
Dataset ID: Africa

Data Center Personnel
Name: STEPHEN JUGGINS
Phone: 44 191 222 8799
Fax: 44 191 222 5421
Email: Stephen.Juggins at ncl.ac.uk
Contact Address:
University of Newcastle
Department of Geography
Newcastle upon Tyne
NEI 7RU
Country: UNITED KINGDOM



Distribution
Fees: None


Personnel
FRANCOISE GASSE
Role: TECHNICAL CONTACT
Phone: 33 4 42 97 15 70
Fax: 33 4 42 97 15 95
Email: gasse at cerege.fr
Contact Address:
CNRS-CEREGE, Europole Mediterraneen de l'Arbois- BP80
City: Aix en Provence Cedex 04
Postal Code: 13545
Country: France


STEPHEN JUGGINS
Role: TECHNICAL CONTACT
Phone: 44 191 222 8799
Fax: 44 191 222 5421
Email: Stephen.Juggins at ncl.ac.uk
Contact Address:
University of Newcastle
Department of Geography
Newcastle upon Tyne
NEI 7RU
Country: UNITED KINGDOM


TYLER B. STEVENS
Role: DIF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References
Barker, P., Telford, R., Gasse, F., & Th?venon, F.. in press. Late
Pleistocene and Holocene paleohydrology of Lake Rukwa, Tanzania,
inferred from diatom analysis. Palaeogeography, Palaeoclimatology,
Palaeoecology.

Chali?, F. and Gasse, F., in press. A 13,500 years diatom record from
the tropical East African Rift Lake Abiyata (Ethiopia). Palaeogeogr.,
Palaeoclim., Palaeoecol..

Dagnachew Legesse, F. Gasse, O. Radakovitch, C. Vallet-Coulomb,
R. Bonnefille, D. Verschuren, E. Gibert, P. Barker. Sous
presse. Environmental nvironmental changes in a tropical lake
(Abiyata, Ethiopia) during recent centuries. Palaeogeogr.,
Palaeoclim., Palaeoecol.

Fritz S, Cumming B.F., Gasse F.,Laird K.R., 1999. Diatoms as
indicators or Hydrologic and climatic change in saline lakes. In
E. Stoermer and J.P. Smol (Eds.), The Diatoms: Applications to
Environmental and Earth Science. Cambridge University Press,
Cambridge, 41-72.

Gasse, F., in press. Diatom-inferred salinity and oxygen isotopes in
Holocene waterbodies of the Western Sahara and Sahel
(Africa).Implications for climate and water resource variability,
Quaternary Sciences Reviews.

Gasse, F., Barker, Ph., Gell, P.A., Fritz, S.C. and Chali?, F., 1997
-Diatom-inferred salinity in palaeolakes, an indirect tracer of
climate change. Quaternary Science Review, vol. 15:1-19.

Gasse, F., 1998. Water resources variability in tropical and
subtropical Africa in the past. In: E. Servat et al. (Eds), Water
resources variability in Africa during the Xxth Century. IAHS, 252,
97-106.

Gasse, F., 2000. Hydrological changes in the African tropics since the
last glacial maximum ; Quaternary Sciences Reviews, 19, 189-211.

Gasse, F., 2001. Perspectives. Hydrological Changes in
Africa. Science, 293, 2259-2260.

Verschuren, D., Laird, K.R. and Cumming, B.F., 2000. Rainfall and
drought in equatorial east Africa during the past 1,100 years. Nature,
403: 410-414.

Creation and Review Dates
DIF Creation Date: 2002-09-23
Last DIF Revision Date: 2012-12-21
Future DIF Review Date: 2003-09-23

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