Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco)
International audience Eighty-two-year rainfall time series have been studied together with climatic patterns of NAO using classical statistical methods. Then, the wavelet approach has been applied to show annual (1 year (1y)) and inter-annual (2–4 years (2-4y), 5–8 years (5-8y), and 8–16 years (8-1...
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Online Access: | https://hal.science/hal-01551131 https://doi.org/10.1007/s12517-015-2174-z |
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ftinsu:oai:HAL:hal-01551131v1 2024-04-14T08:16:01+00:00 Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) Turki, Imen Laignel, Benoît, B. Laftouhi, Noureddine Nouaceur, Zeneddine Zamrane, Zineb Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) Université Cadi Ayyad Marrakech (UCA) Sciences Appliquées à L'Environnement (SCALE) Université Le Havre Normandie (ULH) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) 2016 https://hal.science/hal-01551131 https://doi.org/10.1007/s12517-015-2174-z en eng HAL CCSD Springer info:eu-repo/semantics/altIdentifier/doi/10.1007/s12517-015-2174-z hal-01551131 https://hal.science/hal-01551131 doi:10.1007/s12517-015-2174-z ISSN: 1866-7411 Arabian Journal of Geosciences https://hal.science/hal-01551131 Arabian Journal of Geosciences, 2016, 9, pp.243. ⟨10.1007/s12517-015-2174-z⟩ Marrakech rainfall variability NAO Statistical analysis Continuous wavelet transform Modes of variability Discontinuities [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2016 ftinsu https://doi.org/10.1007/s12517-015-2174-z 2024-03-21T17:23:42Z International audience Eighty-two-year rainfall time series have been studied together with climatic patterns of NAO using classical statistical methods. Then, the wavelet approach has been applied to show annual (1 year (1y)) and inter-annual (2–4 years (2-4y), 5–8 years (5-8y), and 8–16 years (8-16y)) modes distributed following four major discontinuities: 1945, 1960, 1975, and 1995. The 1y, 2-4y, and 5-8y powers show high energy during the wet period 1922–1930 and a low one in 1928–1938. After 1945, the annual mode highlights a high energy while the inter-annual modes present low energy. Between 1975 and 1995, powerful modes of 1 and 2–4 years are identified with low power of 5-8y and 8-16y modes. Since 1995, the low power of 5–8y decreases, while the 8-16y mode emphasizes a high variability. The coherence between NAO and Marrakech precipitation is strongly defined for low frequencies with a total contribution of 75 %. This coherence is in phase in the beginning and presents out phase signs since 1945. The change of phase can be associated to a decreasing of coherence especially around 1990. This finding is useful to understand the relationship between the hydrological variability and NAO climate patterns in the southern side of the Mediterranean Sea. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Institut national des sciences de l'Univers: HAL-INSU Arabian Journal of Geosciences 9 3 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Marrakech rainfall variability NAO Statistical analysis Continuous wavelet transform Modes of variability Discontinuities [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Marrakech rainfall variability NAO Statistical analysis Continuous wavelet transform Modes of variability Discontinuities [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Turki, Imen Laignel, Benoît, B. Laftouhi, Noureddine Nouaceur, Zeneddine Zamrane, Zineb Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
topic_facet |
Marrakech rainfall variability NAO Statistical analysis Continuous wavelet transform Modes of variability Discontinuities [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDE.MCG]Environmental Sciences/Global Changes [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Eighty-two-year rainfall time series have been studied together with climatic patterns of NAO using classical statistical methods. Then, the wavelet approach has been applied to show annual (1 year (1y)) and inter-annual (2–4 years (2-4y), 5–8 years (5-8y), and 8–16 years (8-16y)) modes distributed following four major discontinuities: 1945, 1960, 1975, and 1995. The 1y, 2-4y, and 5-8y powers show high energy during the wet period 1922–1930 and a low one in 1928–1938. After 1945, the annual mode highlights a high energy while the inter-annual modes present low energy. Between 1975 and 1995, powerful modes of 1 and 2–4 years are identified with low power of 5-8y and 8-16y modes. Since 1995, the low power of 5–8y decreases, while the 8-16y mode emphasizes a high variability. The coherence between NAO and Marrakech precipitation is strongly defined for low frequencies with a total contribution of 75 %. This coherence is in phase in the beginning and presents out phase signs since 1945. The change of phase can be associated to a decreasing of coherence especially around 1990. This finding is useful to understand the relationship between the hydrological variability and NAO climate patterns in the southern side of the Mediterranean Sea. |
author2 |
Morphodynamique Continentale et Côtière (M2C) Université de Caen Normandie (UNICAEN) Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN) Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS) Université Cadi Ayyad Marrakech (UCA) Sciences Appliquées à L'Environnement (SCALE) Université Le Havre Normandie (ULH) Normandie Université (NU)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN) |
format |
Article in Journal/Newspaper |
author |
Turki, Imen Laignel, Benoît, B. Laftouhi, Noureddine Nouaceur, Zeneddine Zamrane, Zineb |
author_facet |
Turki, Imen Laignel, Benoît, B. Laftouhi, Noureddine Nouaceur, Zeneddine Zamrane, Zineb |
author_sort |
Turki, Imen |
title |
Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
title_short |
Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
title_full |
Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
title_fullStr |
Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
title_full_unstemmed |
Investigating possible links between the North Atlantic Oscillation and rainfall variability in Marrakech (Morocco) |
title_sort |
investigating possible links between the north atlantic oscillation and rainfall variability in marrakech (morocco) |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://hal.science/hal-01551131 https://doi.org/10.1007/s12517-015-2174-z |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 1866-7411 Arabian Journal of Geosciences https://hal.science/hal-01551131 Arabian Journal of Geosciences, 2016, 9, pp.243. ⟨10.1007/s12517-015-2174-z⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1007/s12517-015-2174-z hal-01551131 https://hal.science/hal-01551131 doi:10.1007/s12517-015-2174-z |
op_doi |
https://doi.org/10.1007/s12517-015-2174-z |
container_title |
Arabian Journal of Geosciences |
container_volume |
9 |
container_issue |
3 |
_version_ |
1796314547140689920 |