Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products

Africa, a continent endowed with huge water resources that sustain its agricultural activities is increasingly coming under threat from impacts of climate extremes (droughts and floods), which puts the very precious water resource into jeopardy. Understanding the relationship between climate variabi...

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Published in:Science of The Total Environment
Main Authors: Anyah, R.O., Forootan, E., Awange, J.L., Khaki, M.
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2018
Subjects:
Online Access:https://orca.cardiff.ac.uk/id/eprint/111006/
https://doi.org/10.1016/j.scitotenv.2018.04.159
https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf
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spelling ftunivcardiff:oai:https://orca.cardiff.ac.uk:111006 2023-05-15T17:35:31+02:00 Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products Anyah, R.O. Forootan, E. Awange, J.L. Khaki, M. 2018-09-01 application/pdf https://orca.cardiff.ac.uk/id/eprint/111006/ https://doi.org/10.1016/j.scitotenv.2018.04.159 https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf en eng Elsevier https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf Anyah, R.O., Forootan, E. https://orca.cardiff.ac.uk/view/cardiffauthors/A2261102I.html orcid:0000-0003-3055-041X orcid:0000-0003-3055-041X, Awange, J.L. and Khaki, M. 2018. Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products. Science of the Total Environment 635 , pp. 1405-1416. 10.1016/j.scitotenv.2018.04.159 https://doi.org/10.1016/j.scitotenv.2018.04.159 file https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf doi:10.1016/j.scitotenv.2018.04.159 Article PeerReviewed 2018 ftunivcardiff https://doi.org/10.1016/j.scitotenv.2018.04.159 2022-10-27T22:43:58Z Africa, a continent endowed with huge water resources that sustain its agricultural activities is increasingly coming under threat from impacts of climate extremes (droughts and floods), which puts the very precious water resource into jeopardy. Understanding the relationship between climate variability and water storage over the continent, therefore, is paramount in order to inform future water management strategies. This study employs Gravity Recovery And Climate Experiment (GRACE) satellite data and the higher order (fourth order cumulant) statistical independent component analysis (ICA) method to study the relationship between terrestrial water storage (TWS) changes and five global climate-teleconnection indices; El Niño-Southern Oscillation (ENSO), North Atlantic Oscillation (NAO), Madden-Julian Oscillation (MJO), Quasi-Biennial Oscillation (QBO) and the Indian Ocean Dipole (IOD) over Africa for the period 2003–2014. Pearson correlation analysis is applied to extract the connections between these climate indices (CIs) and TWS, from which some known strong CI-rainfall relationships (e.g., over equatorial eastern Africa) are found. Results indicate unique linear-relationships and regions that exhibit strong linkages between CIs and TWS. Moreover, unique regions having strong CI-TWS connections that are completely different from the typical ENSO-rainfall connections over eastern and southern Africa are also identified. Furthermore, the results indicate that the first dominant independent components (IC) of the CIs are linked to NAO, and are characterized by significant reductions of TWS over southern Africa. The second dominant ICs are associated with IOD and are characterized by significant increases in TWS over equatorial eastern Africa, while the combined ENSO and MJO are apparently linked to the third ICs, which are also associated with significant increase in TWS changes over both southern Africa, as well as equatorial eastern Africa. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Cardiff University: ORCA (Online Research @ Cardiff) Indian Science of The Total Environment 635 1405 1416
institution Open Polar
collection Cardiff University: ORCA (Online Research @ Cardiff)
op_collection_id ftunivcardiff
language English
description Africa, a continent endowed with huge water resources that sustain its agricultural activities is increasingly coming under threat from impacts of climate extremes (droughts and floods), which puts the very precious water resource into jeopardy. Understanding the relationship between climate variability and water storage over the continent, therefore, is paramount in order to inform future water management strategies. This study employs Gravity Recovery And Climate Experiment (GRACE) satellite data and the higher order (fourth order cumulant) statistical independent component analysis (ICA) method to study the relationship between terrestrial water storage (TWS) changes and five global climate-teleconnection indices; El Niño-Southern Oscillation (ENSO), North Atlantic Oscillation (NAO), Madden-Julian Oscillation (MJO), Quasi-Biennial Oscillation (QBO) and the Indian Ocean Dipole (IOD) over Africa for the period 2003–2014. Pearson correlation analysis is applied to extract the connections between these climate indices (CIs) and TWS, from which some known strong CI-rainfall relationships (e.g., over equatorial eastern Africa) are found. Results indicate unique linear-relationships and regions that exhibit strong linkages between CIs and TWS. Moreover, unique regions having strong CI-TWS connections that are completely different from the typical ENSO-rainfall connections over eastern and southern Africa are also identified. Furthermore, the results indicate that the first dominant independent components (IC) of the CIs are linked to NAO, and are characterized by significant reductions of TWS over southern Africa. The second dominant ICs are associated with IOD and are characterized by significant increases in TWS over equatorial eastern Africa, while the combined ENSO and MJO are apparently linked to the third ICs, which are also associated with significant increase in TWS changes over both southern Africa, as well as equatorial eastern Africa.
format Article in Journal/Newspaper
author Anyah, R.O.
Forootan, E.
Awange, J.L.
Khaki, M.
spellingShingle Anyah, R.O.
Forootan, E.
Awange, J.L.
Khaki, M.
Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
author_facet Anyah, R.O.
Forootan, E.
Awange, J.L.
Khaki, M.
author_sort Anyah, R.O.
title Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
title_short Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
title_full Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
title_fullStr Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
title_full_unstemmed Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products
title_sort understanding linkages between global climate indices and terrestrial water storage changes over africa using grace products
publisher Elsevier
publishDate 2018
url https://orca.cardiff.ac.uk/id/eprint/111006/
https://doi.org/10.1016/j.scitotenv.2018.04.159
https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf
geographic Indian
geographic_facet Indian
genre North Atlantic
North Atlantic oscillation
genre_facet North Atlantic
North Atlantic oscillation
op_relation https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf
Anyah, R.O., Forootan, E. https://orca.cardiff.ac.uk/view/cardiffauthors/A2261102I.html orcid:0000-0003-3055-041X orcid:0000-0003-3055-041X, Awange, J.L. and Khaki, M. 2018. Understanding linkages between global climate indices and terrestrial water storage changes over Africa using GRACE products. Science of the Total Environment 635 , pp. 1405-1416. 10.1016/j.scitotenv.2018.04.159 https://doi.org/10.1016/j.scitotenv.2018.04.159 file https://orca.cardiff.ac.uk/id/eprint/111006/1/STOTEN-D-18-02395R1-31-56.pdf
doi:10.1016/j.scitotenv.2018.04.159
op_doi https://doi.org/10.1016/j.scitotenv.2018.04.159
container_title Science of The Total Environment
container_volume 635
container_start_page 1405
op_container_end_page 1416
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