noaa-lake-14629
Lake Sibaya, South Africa 1800 Year Diatom Hydrological Data
Stager, J.C.; Ryves, D.B.; King, C.D.; Madson, J.; Hazzard, M.; Neumann, F.H.; Maud, R.
Lake Sibaya, South Africa 1800 Year Diatom Hydrological Data
2013-06-27
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/14629
Investigator
J.C.
Stager
Investigator
D.B.
Ryves
Investigator
C.D.
King
Investigator
J.
Madson
Investigator
M.
Hazzard
Investigator
F.H.
Neumann
Investigator
R.
Maud
earth science
paleoclimate
climate reconstructions|paleolimnology
age,null,null,year Common Era,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
electrical conductivity,diatom assemblage|lake water,null,microsiemens per centimeter,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
total planktic diatoms,null,null,percent,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
reconstruction
earth science
paleoclimate
paleolimnology
population abundance
earth science
paleoclimate
paleolimnology
lake level
geoscientificInformation
hydrology
1802 cal yr BP
60 cal yr BP
Complete
-27.3333
-27.3333
32.6
32.6
20
20
Continent
Africa
Southern Africa
South Africa
Lake Sibaya>LATITUDE -27.3333>LONGITUDE 32.6
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
J. Curt Stager, David B. Ryves, Christiaan King, Jerome Madson, Matthew Hazzard, Frank H. Neumann, Rodney Maud. 2013.
Late Holocene precipitation variability in the summer rainfall region of South Africa. Quaternary Science Reviews, Vol. 67, pp. 105-120. DOI: 10.1016/j.quascirev.2013.01.022
The late Holocene history of the South African summer rainfall zone offers insights into the effects of climate on ecosystems and human societies, as well as into the accuracy of model projections of the future. However, some important aspects of this region's climatic history remain unresolved. Here we present new high-resolution diatom records representing hydrological fluctuations at Lake Sibaya, KwaZulu-Natal, during the last 1800 years. The cores were dated with 14C, 210Pb, 137Cs, and exotic pollen, and were sampled at increments of 1-22 years. A low stand ending ~AD 150 was followed by additional decadal to century-scale droughts, most notably ~AD 1540-1760, and several periods of markedly wetter conditions ~AD 220-290, AD 790-830, AD 1470-1540, and AD 1760-1860. The Medieval Climate Anomaly was generally wetter than average and the Little Ice Age was generally drier, but hydroclimate during both intervals was highly variable. These records confirm that local tree ring and stalagmite gray scale series represent rainfall variability, but they also show that widely cited stable isotope series from Makapansgat do not represent past climate as clearly. Because many interpretations of the climatic history of southern Africa have been influenced by those isotope data, we re-examine late Holocene precipitation variability in the summer rainfall zone, and also address model projections of future precipitation in the region.
STUDY NOTES: Diatom record of core SIB-B collected from 16 m depth in the western arm of Lake Sibaya in 2004.
Age model based on AMS dating of pollen fractions and bulk organic sediments, and stratigraphic matching with additional
cores dated with lead-210, cesium-137, and exotic pollen (see manuscript for details). Higher percent planktonic diatoms
("diat-p%") taken to indicate qualitatively wetter conditions that would be likely to favor planktonic over benthic
taxa due to higher lake level, suspended sediments in water column, and/or nutrient enrichment from enhanced runoff.
Planktonic taxa: Aulacoseira, long Nitzschia, Synedra cf. acus and S. cf. tenera. Diatom-based conductivity estimates
("diat_cond") intended for qualitative use, with lower conductivity assumed to represent wetter climatic conditions.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/sibaya2013.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11