River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective

The Nile is the longest river in Africa stretching over around 6650 km through 11 countries. From the times of the ancient Egyptian Pharaonic civilization, the Nile is known to be a blessing, which provides major resources including water and fertile soil for agriculture, and facilitates transportat...

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Autores principales:	Woosok Moon, Abdel Hannachi
Formato:	article
Lenguaje:	EN
Publicado:	Taylor & Francis Group 2021
Materias:	planetary geostrophic motion quasi-geostrophic motion multi-scale analysis Oceanography GC1-1581 Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/e0e04a7409014ff4a7f1d64b6d0632d3
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spelling	oai:doaj.org-article:e0e04a7409014ff4a7f1d64b6d0632d32021-12-01T14:40:58ZRiver Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective1600-087010.1080/16000870.2021.1947551https://doaj.org/article/e0e04a7409014ff4a7f1d64b6d0632d32021-01-01T00:00:00Zhttp://dx.doi.org/10.1080/16000870.2021.1947551https://doaj.org/toc/1600-0870The Nile is the longest river in Africa stretching over around 6650 km through 11 countries. From the times of the ancient Egyptian Pharaonic civilization, the Nile is known to be a blessing, which provides major resources including water and fertile soil for agriculture, and facilitates transportations and international trades in nearby countries. Due to its invaluable importance to local economy and agriculture, it is undoubtedly of paramount importance to know how the variability of the Nile is controlled by local and global climate and its morphological characteristics. Here, we utilize a newly developed time-series analysis method applied to monthly Nile river inflow data to reveal various factors changing the river inflow from seasonal to inter-annual, decadal and beyond. On seasonal time-scales a positive feedback, associated mostly with river’s morphological change driven by summer precipitation, is identified as a main mechanism for maximal variability in September leading to major flooding or drought. In particular, the positive feedback is quite similar in its mechanism to major climate feedbacks observed, e.g. with ice albedo and Bjerknes feedbacks. The slow time-evolution of the positive feedback explains human endeavour history to control nature, such as the control of the Nile annual flooding through dam construction. The analysis of climate association reveals clear link with large-scale and low-frequency forcing. Decadal and multi-decadal timescales of local precipitation and associated teleconnection with atmospheric and oceanic circulation can be traced back to the Pacific Ocean, and involve mostly the El-Nino Southern Oscillation and the Pacific Decadal Oscillation.Woosok MoonAbdel HannachiTaylor & Francis Grouparticleplanetary geostrophic motionquasi-geostrophic motionmulti-scale analysisOceanographyGC1-1581Meteorology. ClimatologyQC851-999ENTellus: Series A, Dynamic Meteorology and Oceanography, Vol 73, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	planetary geostrophic motion quasi-geostrophic motion multi-scale analysis Oceanography GC1-1581 Meteorology. Climatology QC851-999
spellingShingle	planetary geostrophic motion quasi-geostrophic motion multi-scale analysis Oceanography GC1-1581 Meteorology. Climatology QC851-999 Woosok Moon Abdel Hannachi River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
description	The Nile is the longest river in Africa stretching over around 6650 km through 11 countries. From the times of the ancient Egyptian Pharaonic civilization, the Nile is known to be a blessing, which provides major resources including water and fertile soil for agriculture, and facilitates transportations and international trades in nearby countries. Due to its invaluable importance to local economy and agriculture, it is undoubtedly of paramount importance to know how the variability of the Nile is controlled by local and global climate and its morphological characteristics. Here, we utilize a newly developed time-series analysis method applied to monthly Nile river inflow data to reveal various factors changing the river inflow from seasonal to inter-annual, decadal and beyond. On seasonal time-scales a positive feedback, associated mostly with river’s morphological change driven by summer precipitation, is identified as a main mechanism for maximal variability in September leading to major flooding or drought. In particular, the positive feedback is quite similar in its mechanism to major climate feedbacks observed, e.g. with ice albedo and Bjerknes feedbacks. The slow time-evolution of the positive feedback explains human endeavour history to control nature, such as the control of the Nile annual flooding through dam construction. The analysis of climate association reveals clear link with large-scale and low-frequency forcing. Decadal and multi-decadal timescales of local precipitation and associated teleconnection with atmospheric and oceanic circulation can be traced back to the Pacific Ocean, and involve mostly the El-Nino Southern Oscillation and the Pacific Decadal Oscillation.
format	article
author	Woosok Moon Abdel Hannachi
author_facet	Woosok Moon Abdel Hannachi
author_sort	Woosok Moon
title	River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
title_short	River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
title_full	River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
title_fullStr	River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
title_full_unstemmed	River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective
title_sort	river nile discharge, the pacific ocean and world climate – a seasonal synchronization perspective
publisher	Taylor & Francis Group
publishDate	2021
url	https://doaj.org/article/e0e04a7409014ff4a7f1d64b6d0632d3
work_keys_str_mv	AT woosokmoon riverniledischargethepacificoceanandworldclimateaseasonalsynchronizationperspective AT abdelhannachi riverniledischargethepacificoceanandworldclimateaseasonalsynchronizationperspective
_version_	1718405027234578432

River Nile discharge, the Pacific Ocean and world climate – a seasonal synchronization perspective

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