noaa-cave-9742
Jiuxian Cave, China 19KYr Stalagmite Oxygen Isotope Data
Cai, Y.; Tan, L.; Cheng, H.; An, Z.; Edwards, R.L.; Kelly, M.J.; Kong, X.; Wang, X.
Jiuxian Cave, China 19KYr Stalagmite Oxygen Isotope Data
2010-10-07
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9742
Investigator
Y.
Cai
Investigator
L.
Tan
Investigator
H.
Cheng
Investigator
Z.
An
Investigator
R.L.
Edwards
Investigator
M.J.
Kelly
Investigator
X.
Kong
Investigator
X.
Wang
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
oxygen isotopes
geoscientificInformation
Monsoon
18958 cal yr BP
-48 cal yr BP
Complete
33.5667
33.5667
109.1
109.1
1495
1495
Continent
Asia
Eastern Asia
China
Jiuxian Cave>LATITUDE 33.5667>LONGITUDE 109.1
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
Cai, Y., L. Tan, H. Cheng, Z. An, R.L. Edwards, M.J. Kelly,
X. Kong, and X. Wang. 2010.
The variation of summer monsoon precipitation in central China
since the last deglaciation.
Earth and Planetary Science Letters, Vol. 291, pp.21-31.
doi:10.1016/j.epsl.2009.12.039
Two stalagmites (C996-1 and C996-2) collected from the Jiuxian Cave
in the Shaanxi Province in central China have been studied with
U-series dating and stable isotope analysis. Thirty-eight 230Th
dating results showed that the stalagmite C996-1 was continuously
deposited through the last 8.5 ka BP (thousand years before present,
present=1950 AD), and C996-2 was deposited through the last 19 ka BP
excluding two growth hiatuses between 8.3 and 5.7 ka BP, and 15.4
and 11.9 ka BP. With a relatively stable boundary condition,
we interpret the d18O of speleothem calcite as most indicative
of the amount of summer monsoon precipitation, although temperature
and other factors might have some minor impact. The d18O records
show notable changes within the last glacial maximum (LGM),
resembling other East Asian monsoon records such as those from
the Hulu and Sanbao Caves, suggesting that significant monsoonal
climate changes occurred in eastern Asia as far north as the
Qinling Mountains during the LGM interval. A comparison of our
records to precisely dated contemporaneous speleothem records
from other caves shows that the increasing trend of d18O during
the Holocene commenced as early as ~7.5 ka BP in the low-latitude
monsoonal area, i.e. the Hoti Cave, while at higher latitudes this
shift occurred later, such as ~7.0 ka BP in the Dongge Cave,
~5.3 ka BP in the Heshang Cave, ~4.7 ka BP in the Sanbao Cave and
~4.5 ka BP in the Jiuxian Cave. These results imply an asynchronous
change of the summer monsoon precipitation occurred in East Asia
during the Holocene. The asynchrony may be related to the responses
of a coupled tropical and subtropical monsoon system to changes
of the insolation and the differences in thermal forcing, which
result from the complex geographical configuration. The variation
of sea surface temperature (SST) in the western tropical Pacific
may also have important impacts on the summer monsoon precipitation
changes in central and northern China because it affects the
Northwestern Pacific Subtropical High, a monsoon-front regulator.
More robust tests are needed to confirm this phenomenon and to
evaluate the contribution of different factors in detail.
STUDY NOTES: Oxygen isotope data and U-Th dates from two stalagmites collected in
1999 near the end of Jiuxian Cave, Shaanxi Province, central China.
Stalagmite C996-1 is ~32 cm in height and 8-13 cm in diameter, and
stalagmite C996-2 is ~21 cm in height and 6-9 cm in diameter.
Twenty-three and fifteen 230Th dates were acquired from C996-1
and C996-2, respectively. The chronologies show that C996-1
was continuously deposited through the past 8.5 ka BP, and C996-2
grew through the past 19.0 ka BP, excluding two hiatuses between
8.3 and 5.7 ka BP, and 15.4 and 11.9 ka BP. Temporal resolutions
for the d18O measurements vary from 4 to 77 years for C996-1,
and from 36 to 112 years for C996-2.
Data:
230Th dating results of two stalagmites from Jiuxian cave by ICP-MS. The error is 2sigma error.
Lambda230=9.1577×10-6 year-1, Lambda234=2.8263×10-6 year-1 (Cheng et al., 2000), Lambda238=1.55125×10-10 year-1
(Jaffey et al., 1971).
Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of 4.4±2.2×10-6. Those are the values for a material at secular equilibrium, with the bulk earth 232Th/238U value of 3.8. The errors are arbitrarily assumed to be 50%.
*a d234U=([234U/238U]activity-1)×1000.
*b d234Uinitial was calculated based on 230Th age (T), i.e., d234Uinitial=d234Umeasured×eLambda234×T.
*c BP stands for “Before Present” where the “Present” is defined as the year 1950 AD.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/jiuxian2010.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/speleothem/cave-jiuxian-c996-2.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/asia/china/jiuxian2010.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/speleothem/cave-jiuxian-c996-1.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11