Table 3. Correlations between broad-scale climate drivers and the Callitris columellaris ring-width chronology and regional precipitation and scPDSI in northwest Australia.
| RW Chronology | Precipitation | PDSI | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Index | Season | r | p-value | r | p-value | r | p-value | years (n) | |
| SAM | SAM | Dec-May | 0.50 | 0.0001 | 0.40 | 0.0021 | 0.47 | 0.0003 | 1957–2011 |
| ENSO | Niño4 | Dec-May | -0.22 | 0.0302 | -0.21 | 0.0296 | -0.31 | 0.0016 | 1910–2011 |
| SOI | Dec-May | 0.20 | 0.0460 | 0.23 | 0.0221 | 0.29 | 0.0043 | 1910–2011 | |
| Niño3.4 | Dec-May | -0.20 | 0.0435 | -0.21 | 0.0378 | -0.29 | 0.0036 | 1910–2011 | |
| IOD | DMI | Dec-May | 0.17 | NS | 0.04 | NS | -0.01 | NS | 1910–2011 |
| DMI | Jun-Oct | 0.11 | NS | -0.33 | 0.0005 | -0.18 | NS | 1910–2012 | |
| NN | NNI | Dec-Feb | 0.45 | <0.0001 | 0.41 | <0.0001 | 0.55 | <0.0001 | 1910–2011 |
Regional precipitation and scPDSI are the CRU 3.22 0.5° gridded datasets area-averaged over the 5° study region (117–122°E, 21–26°S, Fig 1). SAM is the Southern Annular Mode, ENSO is the El Niño Southern Oscillation, IOD is the Indian Ocean Dipole, NN is the Ningaloo Niño, SOI is the Southern Oscillation Index, DMI is the Dipole Mode Index, and NNI is the Ningaloo Niño index. NS indicates non-significant correlation values (i.e., p > 0.05).