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Reconstructing annual inflows to the headwater catchments of the Murray River, Australia, using the Pacific Decadal Oscillation
Author(s) -
McGowan Hamish A.,
Marx Samuel K.,
Denholm John,
Soderholm Joshua,
Kamber Balz S.
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl037049
Subject(s) - pacific decadal oscillation , el niño southern oscillation , oceanography , climatology , geology , hydrology (agriculture) , southern oscillation , environmental science , geotechnical engineering
The Pacific Decadal Oscillation (PDO) is a major forcing of inter‐decadal to quasi‐centennial variability of the hydroclimatology of the Pacific Basin. Its effects are most pronounced in the extra‐tropical regions, while it modulates the El Niño Southern Oscillation (ENSO), the largest forcing of global inter‐annual climate variability. Palaeo‐PDO indices are now available for at least the past 500 years. Here we show that the >500 year PDO index of Shen et al. (2006) is highly correlated with inflows to the headwaters of Australia's longest river system, the Murray‐Darling. We then use the PDO to reconstruct annual inflows to the Murray River back to A.D. 1474. These show penta‐decadal and quasi‐centennial cycles of low inflows and a possible 500 year cycle of much greater inflow variability. Superimposed on this is the likely influence of recent anthropogenic global warming. We believe this may explain the exceptionally low inflows of the past decade, the lowest of the previous 529 years.