From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
نویسندگان
چکیده
Abstract The Murray-Darling Basin (MDB) is Australia’s major agricultural region. southern MDB receives most of its annual catchment runoff during the cool season (April–September). Focusing on Murrumbidgee River measurements at Wagga and further downstream Hay, river heights are available year to year. 27-year period April–September Hay exhibit decreases between 1965 1991 1992–2018 not matched by declining April-September rainfall. However, permutation tests means variances late autumn (April–May) dam precipitation net inflows, produced p-values indicating a highly significant decline since early 1990s. Consequently, dry catchments in autumn, even with average rainfall, have reduced inflows decreased from Wagga, before water extraction for irrigation. It concluded that lower mean height variability mid-1990s, due combined April–May increased temperatures. Machine learning attribute detection revealed drivers as annular mode (SAM), inter-decadal Pacific oscillation (IPO), Indian Ocean dipole (IOD) global sea-surface temperature (GlobalSST). Continued drying warming will drastically reduce future availability.
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ژورنال
عنوان ژورنال: Scientific Reports
سال: 2021
ISSN: ['2045-2322']
DOI: https://doi.org/10.1038/s41598-021-95531-4