Data · collection
European Diatom Database-East African Dataset
Listed in NASA Earthdata CMR
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.
Description
The East African training set includes samples from 98 sites situated between 19N and 14S in latitude, 27N and 43E in longitude. They range from afro-alpine bogs at altitude of up to 4000 m to hypersaline lakes lying below sea-level.
The conductivity ranges from 40 to 50,000 S cm-1 and the pH from 5 to 10.9. The chemical facies is of the alkaline earths/bicarbonate type for freshwaters, to the Na/carbonate or Na/chloride type for highly concentrated waters. The training set consists of 187 samples.
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Most samples have been collected by F. Gasse (98) from 1970, P. Kilham (19), J.-F. Talling (14) and R.B. Wood (14). Other collaborators in collecting diatom samples have been C. Barton, R.M. Baxter, J. Green, J. Kalff, ad J. L. Richardson. All diatom samples were counted by F. Gasse.
Detailed descriptions of the diatom samples and chemical analyses were published by Gasse et al. (1983). This paper also provides a numerical classification of the diatom assemblages. A total of 579 taxa was identified in the data set, the taxonomy and ecology of which are discussed and illustrated by Gasse (1986a).
This data set was used to develop transfer functions for estimating pH (Gasse and Tekaia, 1983) and conductivity (Gasse and Tekaia, unpublished) and the model has subsequently been applied to diatom sequences to reconstruct lake pH and salinity histories and related changes in the water balance (e.g. Gasse, 1986b ; Barker, 1990 ; Barker et al., 1991).
Links
Catalogue records · 2
- CMR record cmr.earthdata.nasa.gov/search/concepts/C1214612062-SCIOPS.html ↗
catalogue entry · from NASA CMR
- CMR UMM-JSON cmr.earthdata.nasa.gov/search/concepts/C1214612062-SCIOPS.umm_json ↗
metadata API · from NASA CMR
Topics
- Stated by source
- Alkalinity · Conductivity · Diatoms · Diatoms · Lake/Pond · Lakewater Chemical Data · Lakewater Ph Transfer Function · Nitrogen Compounds · Not provided · Surface Sediment Samples · Surface Sediment Samples · Trace Metals
Provenance · 1 source records, 19 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| NASA Earthdata CMR | C1214612062-SCIOPS | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/plants/microalgae/diatoms | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biological-classification/protists/diatoms | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/biosphere/ecosystems/freshwater-ecosystems/lake-pond | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/erosion-sedimentation/sediment-chemistry/surface-sediment-samples | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/land-surface/erosion-sedimentation/sediments/surface-sediment-samples | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/surface-water/surface-water-features/lakes-reservoirs/lakewater-chemical-data | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/contaminants/trace-metals | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/nutrients/nitrogen-compounds | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/water-characteristics/alkalinity | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/water-characteristics/conductivity | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[measured_variable].gcmd:earth-science/terrestrial-hydrosphere/water-quality-water-chemistry/water-characteristics/ph/lakewater-ph-transfer-function | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| concepts[platform].gcmd_platform:not-provided | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| description | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/Abstract |
| license_text | source · NASA CMR | connector:nasa_cmr@1.0.0 | |
| spatial | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/SpatialExtent |
| temporal | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/TemporalExtents |
| title | source · NASA CMR | connector:nasa_cmr@1.0.0 | /umm/EntryTitle |
| version_label | source · NASA CMR | connector:nasa_cmr@1.0.0 |