VG Micromass 602E mass spectrometer upgraded with SIRA series electronics

; climateInterpretation_seasonality changed - was originally subannual; archiveType changed - was originally Coral (CO)

O.053 per mill based on analyses of 410 (15%) replicate samples

cross-checking the annual d18O variation against the annual dense bands counted from the positive X-rays as well as setting the lowest d18O value in a given year equal to November

Secas Island, Panama isotope record 1707 - 1984

d18O (Ocean2kHR_138): interpretation4_scope: '' has been replaced by 'isotope'

Column 'addRhzRKDu0mnlE0BP8O', with variable name 'yearEnsemble', was added to the dataset
Column 'addRl9Gkc1b8DJ0LX1mX', with variable name 'yearEnsemble', was added to the dataset

Linsley, B.K., R. B. Dunbar, G. M. Wellington, D. A. Mucciarone

Linsley, B. K., Dunbar, R. B., Wellington, G. M. and Mucciarone, D. A.: A coral-based reconstruction of Intertropical Convergence Zone variability over Central America since 1707, Journal of Geophysical Research, 99(C5), 9977, doi:10.1029/94jc00360, 1994.

A coral-based reconstruction of Intertropical Convergence Zone variability over Central America since 1707

automatic carbonate preparation system +VG Isogas Prism mass spectrometer.

In our corals we used a combination of distinctive skeletal fluorescent banding (visible under illumination with longwave UV light; Fig. 2) to provide an initial chronology. The accuracy of this chronology was subsequently verified on a year-byyear basis by consideration of the annual cycle in skeletal d18O

There is a good visual match between the smoothed coral record and the similarly smoothed Madang rainfall record for the period from the late 1950s onwards (Fig. 3B). Periods of low rainfall coincide with deposition of isotopically heavy skeleton.... Periods of high amplitude of annual cycle tend to coincide in both records, and these periods tend to occur during the El Nifio phase of the Southern Oscillation. These results suggest that, although relatively small in absolute terms, the observed variations in the amplitude of the coral dI80 annual cycle (about 0.l-0.2 permil) may be attributed mainly to variations in rainfall.