noaa-lake-12910
Verlorenvlei, South Africa 1400 Year Diatom Abundance Data
Stager, J.C.; Mayewski, P.A.; White, J.; Chase, B.M.; Neumann, F.H.; Meadows, M.E.; King, C.D.; Dixon, D.A.
Verlorenvlei, South Africa 1400 Year Diatom Abundance Data
2012-05-15
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12910
Investigator
J.C.
Stager
Investigator
P.A.
Mayewski
Investigator
J.
White
Investigator
B.M.
Chase
Investigator
F.H.
Neumann
Investigator
M.E.
Meadows
Investigator
C.D.
King
Investigator
D.A.
Dixon
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
total epiphytic diatoms,null,null,percent,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
diatom tolerance-based index,null,null,percent,null,paleolimnology,null,null,N,diluted water taxa
earth science
paleoclimate
paleolimnology
diatom tolerance-based index,null,null,percent,null,paleolimnology,null,null,N,brackish water taxa
earth science
paleoclimate
paleolimnology
age,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
population abundance
geoscientificInformation
westerlies
1400 cal yr BP
-59 cal yr BP
Complete
-32.36
-32.36
18.44
18.44
1
1
Continent
Africa
Southern Africa
South Africa
Verlorenvlei>LATITUDE -32.36>LONGITUDE 18.44
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
Stager, J.C., P.A. Mayewski, J. White, B.M. Chase, F.H. Neumann,
M.E. Meadows, C.D. King, and D.A. Dixon. 2012.
Precipitation variability in the winter rainfall zone of South
Africa during the last 1400 yr linked to the austral westerlies.
Climate of the Past, Vol. 8, pp. 877-887.
www.clim-past.net/8/877/2012/
doi:10.5194/cp-8-877-2012
The austral westerlies strongly influence precipitation and ocean
circulation in the southern temperate zone, with important
consequences for cultures and ecosystems. Global climate models
anticipate poleward retreat of the austral westerlies with future
warming, but the available paleoclimate records that might test
these models have been limited to South America and New Zealand,
are not fully consistent with each other and may be complicated
by influences from other climatic factors. Here we present the
first high-resolution diatom and sedimentological records from
the winter rainfall region of South Africa, representing
precipitation in the equatorward margin of the westerly wind belt
during the last 1400 yr. Inferred rainfall was relatively high
~1400-1200 cal yr BP, decreased until ~950 cal yr BP, and rose
notably through the Little Ice Age with pulses centred on ~600,
530, 470, 330, 200, 90, and 20 cal yr BP. Synchronous fluctuations
in Antarctic ice core chemistry strongly suggest that these
variations were linked to changes in the westerlies. Equatorward
drift of the westerlies during the wet periods may have influenced
Atlantic meridional overturning circulation by restricting marine
flow around the tip of Africa. Apparent inconsistencies among some
aspects of records from South America, New Zealand and South Africa
warn against the simplistic application of single records to the
Southern Hemisphere as a whole. Nonetheless, these findings in
general do support model projections of increasing aridity in
the austral winter rainfall zones with future warming.
STUDY NOTES: Diatom time series from Verlorenvlei, South Africa for the past
1400 years. Diatom data grouped as follows:
dilute-water taxa = mostly Aulacoseira granulata + Nitzschia lacuum
+ Synedra delicatissima (sensu Partrick & Reimer)
Brackish taxa = Cyclotella meneghiniana + Thalassiosira
Epiphytic taxa = Cocconeis + Epithemia
Higher "% dilute" interpreted as indicating more winter rains,
with austral westerlies shifted equatorward.
Core VV09, Verlorenvlei, South Africa:
32.36°S, 18.44°'E, ~1m elevation, 4m water depth.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/verlorenvlei2012.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/africa/verlorenvlei2012.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11