noaa-cave-5431
Cruz et al. 2005 Botuvera Cave, Brazil Stalagmite Stable Isotope Data
Cruz, J.W.; Burns, S.J.; Karmann, I.; Sharp, W.D.; Vuille, M.; Cardoso, A.O.; Ferrari, J.A.; Silva Dias, P.L.; Viana, O.
Cruz et al. 2005 Botuvera Cave, Brazil Stalagmite Stable Isotope Data
2005-03-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5431
Investigator
J.W.
Cruz
Investigator
S.J.
Burns
Investigator
I.
Karmann
Investigator
W.D.
Sharp
Investigator
M.
Vuille
Investigator
A.O.
Cardoso
Investigator
J.A.
Ferrari
Investigator
P.L.
Silva Dias
Investigator
O.
Viana
earth science
paleoclimate
speleothems
depth,null,null,millimeter,null,speleothems,null,null,N,null
earth science
paleoclimate
speleothems
age,null,null,calendar year before present,null,speleothems,null,null,N,null
earth science
paleoclimate
speleothems
delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
speleothems
delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,raw,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
speleothems
carbon isotopes
earth science
paleoclimate
speleothems
oxygen isotopes
geoscientificInformation
Dansgaard-Oeschger cycles
PAGES 2k Network
PAGES LOTRED SA2k
millennial resolution
-114210 AD
1950 AD
116160 cal yr BP
0 cal yr BP
Complete
-27.22
-27.22
-49.16
-49.16
230
230
Continent
South America
Brazil
Botuverá Cave>LATITUDE -27.22>LONGITUDE -49.16
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
Cruz, F.W., Jr., S.J. Burns, I. Karmann, W.D. Sharp, M. Vuille, A.O. Cardoso, J.A. Ferrari, P.L. Silva Dias, and O. Viana, Jr. 2005. Insolation-driven changes in atmospheric circulation over the past 116,000 years in subtropical Brazil. Nature, 434, No. 7029, 63-66
During the last glacial period, large millennial-scale temperature
oscillation-the 'Dansgaard/Oeschger' cycles-were the primary
climate signal in Northern Hemisphere climate archives
from the high latitudes to the tropics. But whether the
influence of these abrupt climate changes extended to the tropical
and subtropical Southern Hemisphere, where changes in insolation
are thought to be the main direct forcing of climate, has
remained unclear. Here we present a high-resolution oxygen
isotope record of a U/Th-dated stalagmite from subtropical
southern Brazil, covering the past 116,200 years. The oxygen
isotope signature varies with shifts in the source region and
amount of rainfall in the area, and hence records changes in
atmospheric circulation and convective intensity over South
America. We find that these variations in rainfall source and
amount are primarily driven by summer solar radiation, which is
controlled by the Earth's precessional cycle. The Dansgaard/
Oeschger cycles can be detected in our record and therefore we
confirm that they also affect the tropical hydrological cycle,
but that in southern subtropical Brazil, millennial-scale
climate changes are not as dominant as they are in the Northern
Hemisphere.
STUDY NOTES: DESCRIPTION:
Bt2 stalagmite is a continuous record of paleoclimate changes over
subtropical Brazil for the last 116,00 years. The oxygen stable isotope
(per mil VPDB) data set has a resolution of ~150 years and its age model
is based on 20 U/Th ages.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/southamerica/brazil/botuvera2005.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11