samples were reacted in vacuo in a modified autocarbonate device at 90C and the purified CO2 analyzed on a gas source stable isotope ratio mass spectrometer

There is a 0.2 per mil offset in absolute value between the Nauru 1 and 2 records; The offset is ~0.23 per mil prior to 1980 and ~0.14 per mil after 1980

Local  precipitation  and  SST  anomalies  at  Nauru,  indicative  of  the  state  of  the  Southern  Oscillation,  are  faithfully  recorded  in  coral  ?80  over  the  100  year  long  time  series  of  the  two  corals  analyzed

"we created a preliminary age model using the seasonal (doublet) structure of the respective d13C time series. The age model of Nauru 2 was then optimized through linear mapping of the coral d18O to the local precipitation record with an estimated error of 2-3 months. Over the interval where the two corals have similar sampling resolution (i.e., 1 and 2 mm density) the Nauru 1 d18O record was linearly mapped to the Nauru 2 d18O record"

There is a 0.2 per mil offset in absolute value between the Nauru 1 and 2 records; The offset is ~0.23 per mil prior to 1980 and ~0.14 per mil after 1981

The observed d180 decrease that occurs between 1952 and 1995 (-0.5 permil) equates to a -2.5C warming, an -2 permil decrease in salinity [Fairbanks et al., 1997], or some combination thereof. Instrumental and reconstructed SSTs of a slightly larger region [Reynolds and Smith, 1994; Kaplan et al., 1998] do show an -0.5C increase which can only be partly responsible for the observed trend in the coral records. Moreover, the shift does not appear to be a consequence of a change in the isotopic composition of precipitation in the region [Rozanski et al., 1992].

Nauru Island seasonal d18O and d13C, 1898-1995

Column 'CO99GUMI-chron-NA1', with variable name 'yearEnsemble', was added to the dataset
Column 'CO99GUMI-chron-NA2', with variable name 'yearEnsemble', was added to the dataset
Column 'CO99GUMI-chron-NA3', with variable name 'yearEnsemble', was added to the dataset
Column 'CO99GUMI-chron-NA4', with variable name 'yearEnsemble', was added to the dataset