| SPELEOTHEMS |
Fleitmann et al. 2003, 2007 Qunf Cave, Oman Stalagmite Oxygen Isotope Data
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Fleitmann, D.;Burns, S.J.;Mangini, A.;Mudelsee, M.;Kramers, J.;Villa, I.;Neff, U.;Al-Subary, A.A.;Buettner, A.;Hippler, D.;Matter,
A. 2007 Holocene ITCZ and Indian monsoon dynamics recorded in stalagmites from Oman and Yemen (Socotra). Quaternary Science
Reviews Vol. 26, pp. 170¿188.
| Data Coverage |
North: 17.17 * South: 17.17 |
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West: 54.3 * East: 54.3 |
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Altitude: 650 m |
Start Year: -8558 AD
End Year: 1920 AD
Data: Please Cite Data Contributors!
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Summary: High-resolution oxygen isotope (d18O) profiles of Holocene stalagmites
from four caves in Northern and Southern Oman and Yemen (Socotra) provide
detailed information on fluctuations in precipitation along a latitudinal
transect from 12ºN to 23ºN. d18O values reflect the amount of precipitation
which is primarily controlled by the mean latitudinal position of the ITCZ
and dynamics of the Indian summer monsoon (ISM). During the early Holocene
rapidly decreasing d18O values indicate a rapid northward displacement in
the mean latitudinal position of the summer ITCZ and the associated ISM
rainfall belt, with decadal- to centennial-scale changes in monsoon
precipitation correlating well with high-latitude temperature variations
recorded in Greenland ice cores. During the middle to late Holocene the
summer ITCZ continuously migrated southward and monsoon precipitation
decreased gradually in response to decreasing solar insolation, a trend,
which is also recorded in other monsoon records from the Indian and East
Asian monsoon domains. Importantly, there is no evidence for an abrupt
middle Holocene weakening in monsoon precipitation. Although abrupt monsoon
events are apparent in all monsoon records, they are short-lived and clearly
superimposed on the long-term trend of decreasing monsoon precipitation.
For the late Holocene there is an anti-correlation between ISM precipitation
in Oman and inter-monsoon (spring/autumn) precipitation on Socotra, revealing
a possible long-term change in the duration of the summer monsoon season
since at least 4.5 ka BP. Together with the progressive shortening of the
ISM season, gradual southward retreat of the mean summer ITCZ and weakening
of the ISM, the total amount of precipitation decreased in those areas
located at the northern fringe of the Indian and Asian monsoon domains,
but increased in areas closer to the equator.
More Info on Speleothems |
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Complete XML Record: noaa-cave-5541
(Last Revised: 2007-10-18 )
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