From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin

Abstract The Murray-Darling Basin (MDB) is Australia’s major agricultural region. The southern MDB receives most of its annual catchment runoff during the cool season (April–September). Focusing on the Murrumbidgee River measurements at Wagga Wagga and further downstream at Hay, cool season river he...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Milton S. Speer, L. M. Leslie, S. MacNamara, J. Hartigan
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8e89450fa32141c19223f064889f1fa7
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:8e89450fa32141c19223f064889f1fa7
record_format	dspace
spelling	oai:doaj.org-article:8e89450fa32141c19223f064889f1fa72021-12-02T19:06:35ZFrom the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin10.1038/s41598-021-95531-42045-2322https://doaj.org/article/8e89450fa32141c19223f064889f1fa72021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-95531-4https://doaj.org/toc/2045-2322Abstract The Murray-Darling Basin (MDB) is Australia’s major agricultural region. The southern MDB receives most of its annual catchment runoff during the cool season (April–September). Focusing on the Murrumbidgee River measurements at Wagga Wagga and further downstream at Hay, cool season river heights are available year to year. The 27-year period April–September Hay and Wagga Wagga river heights exhibit decreases between 1965 and 1991 and 1992–2018 not matched by declining April-September catchment rainfall. However, permutation tests of means and variances of late autumn (April–May) dam catchment precipitation and net inflows, produced p-values indicating a highly significant decline since the early 1990s. Consequently, dry catchments in late autumn, even with average cool season rainfall, have reduced dam inflows and decreased river heights downstream from Wagga Wagga, before water extraction for irrigation. It is concluded that lower April–September mean river heights at Wagga Wagga and decreased river height variability at Hay, since the mid-1990s, are due to combined lower April–May catchment precipitation and increased mean temperatures. Machine learning attribute detection revealed the southern MDB drivers as the southern annular mode (SAM), inter-decadal Pacific oscillation (IPO), Indian Ocean dipole (IOD) and global sea-surface temperature (GlobalSST). Continued catchment drying and warming will drastically reduce future water availability.Milton S. SpeerL. M. LeslieS. MacNamaraJ. HartiganNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-16 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Milton S. Speer L. M. Leslie S. MacNamara J. Hartigan From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
description	Abstract The Murray-Darling Basin (MDB) is Australia’s major agricultural region. The southern MDB receives most of its annual catchment runoff during the cool season (April–September). Focusing on the Murrumbidgee River measurements at Wagga Wagga and further downstream at Hay, cool season river heights are available year to year. The 27-year period April–September Hay and Wagga Wagga river heights exhibit decreases between 1965 and 1991 and 1992–2018 not matched by declining April-September catchment rainfall. However, permutation tests of means and variances of late autumn (April–May) dam catchment precipitation and net inflows, produced p-values indicating a highly significant decline since the early 1990s. Consequently, dry catchments in late autumn, even with average cool season rainfall, have reduced dam inflows and decreased river heights downstream from Wagga Wagga, before water extraction for irrigation. It is concluded that lower April–September mean river heights at Wagga Wagga and decreased river height variability at Hay, since the mid-1990s, are due to combined lower April–May catchment precipitation and increased mean temperatures. Machine learning attribute detection revealed the southern MDB drivers as the southern annular mode (SAM), inter-decadal Pacific oscillation (IPO), Indian Ocean dipole (IOD) and global sea-surface temperature (GlobalSST). Continued catchment drying and warming will drastically reduce future water availability.
format	article
author	Milton S. Speer L. M. Leslie S. MacNamara J. Hartigan
author_facet	Milton S. Speer L. M. Leslie S. MacNamara J. Hartigan
author_sort	Milton S. Speer
title	From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
title_short	From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
title_full	From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
title_fullStr	From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
title_full_unstemmed	From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin
title_sort	from the 1990s climate change has decreased cool season catchment precipitation reducing river heights in australia’s southern murray-darling basin
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8e89450fa32141c19223f064889f1fa7
work_keys_str_mv	AT miltonsspeer fromthe1990sclimatechangehasdecreasedcoolseasoncatchmentprecipitationreducingriverheightsinaustraliassouthernmurraydarlingbasin AT lmleslie fromthe1990sclimatechangehasdecreasedcoolseasoncatchmentprecipitationreducingriverheightsinaustraliassouthernmurraydarlingbasin AT smacnamara fromthe1990sclimatechangehasdecreasedcoolseasoncatchmentprecipitationreducingriverheightsinaustraliassouthernmurraydarlingbasin AT jhartigan fromthe1990sclimatechangehasdecreasedcoolseasoncatchmentprecipitationreducingriverheightsinaustraliassouthernmurraydarlingbasin
_version_	1718377163536728064

From the 1990s climate change has decreased cool season catchment precipitation reducing river heights in Australia’s southern Murray-Darling Basin

Ejemplares similares