noaa-lake-14129
Intensification of southwestern Indonesian rainfall over the past millennium
Konecky, B.L.; Russell, J.M.; Rodysill, J.R.; Vuille, M.; Bijaksana, S.; Huang, Y.
Intensification of southwestern Indonesian rainfall over the past millennium
2013-03-20
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/14129
Investigator
B.L.
Konecky
Investigator
J.M.
Russell
Investigator
J.R.
Rodysill
Investigator
M.
Vuille
Investigator
S.
Bijaksana
Investigator
Y.
Huang
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 2H,organic matter,null,per mil VSMOW,null,paleolimnology,filtered,null,N,terrestrial leaf wax interpretation; low-pass filtered
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 2H,organic matter,null,per mil VSMOW,null,paleolimnology,null,null,N,terrestrial leaf wax interpretation
earth science
paleoclimate
paleolimnology
hydrogen isotopes
geoscientificInformation
ENSO
Intertropical Convergence Zone (ITCZ)
hydrology
precipitation
852 AD
2002 AD
1098 cal yr BP
-52 cal yr BP
Complete
-8.008817
-8.008817
113.312
113.312
324
324
Ocean
Indian Ocean
Indonesia
Jawa Timur
Lake Lading>LATITUDE -8.008817>LONGITUDE 113.312
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
Konecky, B. L., Russell, J. M., Rodysill, J. R., and Vuille, M. (2013). Intensification of southwestern Indonesian rainfall over the past millennium. Geophysical Research Letters, 40. doi:10.1029/2012GL054331
Konecky, B. L., Russell, J. M., Johnson, T. C., Brown, E. T., Berke, M. A., Werne, J. P., and Huang, Y. (2011). Atmospheric circulation patterns during late Pleistocene climate changes at Lake Malawi, Africa. Earth and Planetary Science Letters, 312(3), 318–326.
Modern precipitation in Indonesia is strongly correlated to variations in the Asian/Australasian monsoons, the Walker circulation, and migrations of the Intertropical Convergence Zone (ITCZ), but controls on multi-decadal to millennial rainfall variations are less clear. We present a new, high-resolution, precipitation proxy reconstruction from Lake Lading (8S, 113E), Java, from 850 C.E. to present, based on the dD of terrestrial plant waxes. We find that rainfall has steadily increased in Java over the past millennium. This increase persists into the 20th century, despite evidence from other tropical proxy records for a northward ITCZ migration during the last two centuries, which should introduce drier conditions to Java. Aspects of this long-term increase in rainfall resemble records from the northern hemisphere, tropical Indo-Pacific, suggesting that strengthening Walker circulation played an important role in this long-term increase in rainfall and decrease in the dD of precipitation, while ITCZ variations may have been important to climate variations on multi-decadal to centennial timescales.
STUDY NOTES: Samples for dDwax analysis were taken at an average resolution of 8.5years (ranging approximately 3 to 25years). One hundred seventy sediment samples were freeze-dried, homogenized, and extracted using a Dionex Accelerated Solvent Extractor 350 to yield the soluble lipid fraction. Fatty acids were then purified according to previously described methods [Konecky et al., 2011]. dD was measured on the C28 n-alkanoic acid, the dominant homologue in all samples, using gas chromatography- pyrolysis-isotope ratio-mass spectrometry. Samples were randomized and run in duplicate, except for a subset of 18 samples that were run in triplicate. The pooled standard deviation of triplicate samples was 1.08%, and the 1-s error on a synthetic fatty acid methyl ester standard run between every six replicates was 2.5%. dDwax values are reported relative to Vienna Standard Mean Ocean Water.
Leaf wax delta-D(C28 n-alkanoic acid) from Lake Lading, East Java, Indonesia.
ADDITIONAL REFERENCE FOR FATTY ACID PURIFICATION:
Konecky, B. L., Russell, J. M., Johnson, T. C., Brown, E. T., Berke, M. A., Werne, J. P., & Huang, Y. (2011). Atmospheric circulation patterns during late Pleistocene climate changes at Lake Malawi, Africa. Earth and Planetary Science Letters, 312(3), 318–326.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/indonesia/lading2013.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/indonesia/lading2013.xls
USA/NOAA
DIF
Version 9.8.4
2019-03-27
2019-03-27