Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?

This article examines the links and the influence of Antarctic Oscillation (AAO) on precipitation over the Uruguay River Drainage Basin and adjacent regions, situated in Southeastern South America. In this article, we used monthly data of AAO Index obtained from the Climate Prediction Center/Nationa...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Fábio Guimarães Oliva, Maria Gertrudes A. Justi da Silva
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	antarctic oscillation precipitation teleconnection uruguay river drainage basin Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/a756473ecbe54c878634f037f89df798
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:a756473ecbe54c878634f037f89df798
record_format	dspace
spelling	oai:doaj.org-article:a756473ecbe54c878634f037f89df7982021-11-05T19:01:27ZDoes Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?2040-22442408-935410.2166/wcc.2020.001https://doaj.org/article/a756473ecbe54c878634f037f89df7982021-08-01T00:00:00Zhttp://jwcc.iwaponline.com/content/12/5/1501https://doaj.org/toc/2040-2244https://doaj.org/toc/2408-9354This article examines the links and the influence of Antarctic Oscillation (AAO) on precipitation over the Uruguay River Drainage Basin and adjacent regions, situated in Southeastern South America. In this article, we used monthly data of AAO Index obtained from the Climate Prediction Center/National Centers for Environmental Prediction (CPC/NCEP); monthly data of 500 hPa vertical motion through omega variable (ω = Dp/Dt) and converted to vertical velocity (cm/s) from the NCEP/NCAR Reanalysis; monthly data of precipitation from the NCEP Reanalysis 2 and monthly data of precipitation rate from the CPC Merged Analysis of Precipitation (CMAP) with a latitude × longitude spatial resolution of 2.5° × 2.5°. All data are monthly means and were obtained from January 1979 to December 2008. The methodological procedures used Grid Analysis and Display System (GrADS) software to generate composites of vertical motion and precipitation rates. In the case of CMAP precipitation data, the methodology consists of applying the Aspin Welch statistical test, which verifies the statistical significance of the difference between two means using a significance level of 5%. The study region indicates a tendency to present higher (lower) mean rates of precipitation during the AAO negative (positive) phase. The vertical motion analysis results corroborate with the precipitation rates since the higher vertical motions were found during the negative phase of AAO. The statistical test showed, to some areas of Uruguay River Drainage Basin and adjacent regions, statistically significant differences between mean rates of precipitation observed in both phases of AAO. HIGHLIGHTS The study and the investigations of the Antarctic Oscillation – AAO (also called Southern Annular Mode – SAM) are relatively new in South America.; The importance of climate change and climate variability in the environmental changes, such as water supply and global and local warming.; We have few studies discussing the relations of AAO or SAM with precipitation over a drainage basin in South America.; The impacts of extreme rainfall or severe droughts in water supply and agriculture over southeastern Brazil where population increases year after year.; The importance of the study to hydroelectric power generation and to the agriculture sector, important economic activities in the study region.;Fábio Guimarães OlivaMaria Gertrudes A. Justi da SilvaIWA Publishingarticleantarctic oscillationprecipitationteleconnectionuruguay river drainage basinEnvironmental technology. Sanitary engineeringTD1-1066Environmental sciencesGE1-350ENJournal of Water and Climate Change, Vol 12, Iss 5, Pp 1501-1514 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	antarctic oscillation precipitation teleconnection uruguay river drainage basin Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350
spellingShingle	antarctic oscillation precipitation teleconnection uruguay river drainage basin Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Fábio Guimarães Oliva Maria Gertrudes A. Justi da Silva Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
description	This article examines the links and the influence of Antarctic Oscillation (AAO) on precipitation over the Uruguay River Drainage Basin and adjacent regions, situated in Southeastern South America. In this article, we used monthly data of AAO Index obtained from the Climate Prediction Center/National Centers for Environmental Prediction (CPC/NCEP); monthly data of 500 hPa vertical motion through omega variable (ω = Dp/Dt) and converted to vertical velocity (cm/s) from the NCEP/NCAR Reanalysis; monthly data of precipitation from the NCEP Reanalysis 2 and monthly data of precipitation rate from the CPC Merged Analysis of Precipitation (CMAP) with a latitude × longitude spatial resolution of 2.5° × 2.5°. All data are monthly means and were obtained from January 1979 to December 2008. The methodological procedures used Grid Analysis and Display System (GrADS) software to generate composites of vertical motion and precipitation rates. In the case of CMAP precipitation data, the methodology consists of applying the Aspin Welch statistical test, which verifies the statistical significance of the difference between two means using a significance level of 5%. The study region indicates a tendency to present higher (lower) mean rates of precipitation during the AAO negative (positive) phase. The vertical motion analysis results corroborate with the precipitation rates since the higher vertical motions were found during the negative phase of AAO. The statistical test showed, to some areas of Uruguay River Drainage Basin and adjacent regions, statistically significant differences between mean rates of precipitation observed in both phases of AAO. HIGHLIGHTS The study and the investigations of the Antarctic Oscillation – AAO (also called Southern Annular Mode – SAM) are relatively new in South America.; The importance of climate change and climate variability in the environmental changes, such as water supply and global and local warming.; We have few studies discussing the relations of AAO or SAM with precipitation over a drainage basin in South America.; The impacts of extreme rainfall or severe droughts in water supply and agriculture over southeastern Brazil where population increases year after year.; The importance of the study to hydroelectric power generation and to the agriculture sector, important economic activities in the study region.;
format	article
author	Fábio Guimarães Oliva Maria Gertrudes A. Justi da Silva
author_facet	Fábio Guimarães Oliva Maria Gertrudes A. Justi da Silva
author_sort	Fábio Guimarães Oliva
title	Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
title_short	Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
title_full	Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
title_fullStr	Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
title_full_unstemmed	Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?
title_sort	does antarctic oscillation have links and influence precipitation over the uruguay river drainage basin in southeastern south america?
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/a756473ecbe54c878634f037f89df798
work_keys_str_mv	AT fabioguimaraesoliva doesantarcticoscillationhavelinksandinfluenceprecipitationovertheuruguayriverdrainagebasininsoutheasternsouthamerica AT mariagertrudesajustidasilva doesantarcticoscillationhavelinksandinfluenceprecipitationovertheuruguayriverdrainagebasininsoutheasternsouthamerica
_version_	1718444056427626496

Does Antarctic Oscillation have links and influence precipitation over the Uruguay River Drainage Basin in Southeastern South America?

Ejemplares similares