High Indian Native Zinke

Core/Site name:

Mayotte

Elevation:

-2

Archive:

corals

Species:

Porites solida

Proxy measurement:

Sr/Ca, d18O

Sampling resolution:

seasonal

Climate sensitivity:

temperature, hydrological variability

Dating information:

Absolute

Startyear:

1881 AD

Endyear:

1994 AD

All uncertainties:

Average precision based on duplicate sample analysis and on multiple analysis of NBS 19 is plus/minus 0.07 % mil for delta18O. Instrumental precision was typically better than plus/minus 0.15% relative standard deviation (RSD) for Ca and plus/minus 0.08% RSD for Sr (1-sigma). For the Sr/Ca ratios the error was better than plus/minus 0.2% RSD (1-sigma). The reproducibility of the Sr/Ca ratios of replicate measurements performed on different days was plus/minus 0.2% RSD or 0.005 mmol/mol (1-sigma).

Description:

We reconstruct the hydrologic history of the tropicalwestern Indian Ocean by calculating the d18Oseawater from coupled coral Sr/Ca and d18O measurements in a massive Porites coral from Mayotte (Comoros) between 1881 and 1994. We found that the precipitation-evaporation balance varies naturally on time scales of 5-6 years and 18-25 years. High (low) SSTs are associated with positive (negative) d18Oseawater implying that atmospheric variability is linked with remote climate modes in the Indian Ocean and the tropical/extratropical Pacific Ocean. Warm El Nino-Southern Oscillation events are associated with a negative freshwater balance at Mayotte. This case study demonstrates that a much denser network of d18Oseawater reconstructions is crucial for understanding the spatial patterns of hydrologicalconditions.

Data entered by name:

Bryan, Sean

Data entered by email:

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Main reference(s):

Zinke, J., M. Pfeiffer, O. Timm, W.-C. Dullo, D. Kroon, and B. A. Thomassin. 2008. Mayotte coral reveals hydrological changes in the western Indian Ocean between 1881 and 1994. Geophys. Res. Lett., 35, L23707, doi:10.1029/2008GL035634.

Link to reference 1:

http://www.agu.org/journals/gl/gl0823/2008GL035634/

Data storage link 1:

ftp://ftp.ncdc.noaa.gov/pub/data/paleo/coral/indian_ocean/mayotte2008.txt

Current dating method:

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Annual snow acc rate:

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Category: Ocean2k