High Pacific Native Tierney

Core/Site name:

Makassar Strait: BJ8-03-31MC, BJ8-03-34GGC

Elevation:

-459

Archive:

marine sediments (downcore)

Species:

leaf waxes

Proxy measurement:

dD

Sampling resolution:

decadal

Climate sensitivity:

precipitation

Dating resolution:

31MC: 13 Pb210 analyses and 3 14C dates for ~300 years; 34GGC: 5 14C dates for ~2000 years

Dating information:

radiometric

Startyear:

331 BC

Endyear:

1998 AD

All uncertainties:

1σ error based on long-term, repeat analysis of an external FAME standard is 2‰–3‰; 1σ error of the C28, C30 and C32 n-acid triplicates was 0.9‰, 0.7‰, and 0.9‰, respectively. Results presented here are triplicate means.

Description:

Instrumental data suggest that major shifts in tropical Pacific atmospheric dynamics and hydrology have occurred within the past century, potentially in response to anthropogenic warming. To better understand these trends, we use the hydrogen isotopic ratios of terrestrial higher plant leaf waxes (dDwax) in marine sediments from southwest Sulawesi, Indonesia, to compile a detailed reconstruction of central Indo-Pacific Warm Pool (IPWP) hydrologic variability spanning most of the last two millennia. Our paleodata are highly correlated with a monsoon reconstruction from Southeast Asia, indicating that intervals of strong East Asian summer monsoon (EASM) activity are associated with a weaker Indonesian monsoon (IM). Furthermore, the centennial-scale oscillations in our data follow known changes in Northern Hemisphere climate (e.g., the Little Ice Age and Medieval Warm Period) implying a dynamic link between Northern Hemisphere temperatures and IPWP hydrology. The inverse relationship between the EASM and IM suggests that migrations of the Intertropical Convergence Zone and associated changes in monsoon strength caused synoptic hydrologic shifts in the IPWP throughout most of the past two millennia.

Data entered by name:

Bryan, Sean

Data entered by email:

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Main reference(s):

Tierney, J.E., D.W. Oppo, Y. Rosenthal, J.M. Russell, and B.K. Linsley. 2010. Coordinated hydrological regimes in the Indo-Pacific region during the past two millennia. Paleoceanography, 25, PA1102, doi:10.1029/2009PA001871. Age Model:Oppo, D.W., Y. Rosenthal, and B.K. Linsley. 2009.2,000-year-long temperature and hydrology reconstructions from the Indo-Pacific warm pool. Nature, Vol. 460, No. 7259, pp. 1113-1116, 27 August 2009. doi:10.1038/nature08233

Link to reference 1:

http://www.agu.org/journals/pa/pa1001/2009PA001871/

Link to reference 2:

http://www.nature.com/nature/journal/v460/n7259/full/nature08233.html

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tierney2010/tierney2010.txt

Data storage link 2:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/oppo2009/oppo2009.txt

Comments:

Core locations: BJ8-03-31MC (multi-core): 3°53'S, 119°27'E, 459 m depth BJ8-03-34GGC (gravity core): 3°53'S, 119°27'E, 503 m depth

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k