Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France

<p>Understanding how water resources vary in response to climate at different temporal and spatial scales is crucial to inform long-term management. Climate change impacts and induced trends may indeed be substantially modulated by low-frequency (multi-year) variations, whose strength varies i...

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Autores principales:	M. Fossa, B. Dieppois, N. Massei, M. Fournier, B. Laignel, J.-P. Vidal
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/f4b8063d28bc4547b881e391a899e579
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spelling	oai:doaj.org-article:f4b8063d28bc4547b881e391a899e5792021-11-04T06:40:03ZSpatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France10.5194/hess-25-5683-20211027-56061607-7938https://doaj.org/article/f4b8063d28bc4547b881e391a899e5792021-11-01T00:00:00Zhttps://hess.copernicus.org/articles/25/5683/2021/hess-25-5683-2021.pdfhttps://doaj.org/toc/1027-5606https://doaj.org/toc/1607-7938<p>Understanding how water resources vary in response to climate at different temporal and spatial scales is crucial to inform long-term management. Climate change impacts and induced trends may indeed be substantially modulated by low-frequency (multi-year) variations, whose strength varies in time and space, with large consequences for risk forecasting systems. In this study, we present a spatial classification of precipitation, temperature, and discharge variability in France, based on a fuzzy clustering and wavelet spectra of 152 near-natural watersheds between 1958 and 2008. We also explore phase–phase and phase–amplitude causal interactions between timescales of each homogeneous region. A total of three significant timescales of variability are found in precipitation, temperature, and discharge, i.e., 1, 2–4, and 5–8 years. The magnitude of these timescales of variability is, however, not constant over the different regions. For instance, southern regions are markedly different from other regions, with much lower (5–8 years) variability and much larger (2–4 years) variability. Several temporal changes in precipitation, temperature, and discharge variability are identified during the 1980s and 1990s. Notably, in the southern regions of France, we note a decrease in annual temperature variability in the mid 1990s. Investigating cross-scale interactions, our study reveals causal and bi-directional relationships between higher- and lower-frequency variability, which may feature interactions within the coupled land–ocean–atmosphere systems. Interestingly, however, even though time frequency patterns (occurrence and timing of timescales of variability) were similar between regions, cross-scale interactions are far much complex, differ between regions, and are not systematically transferred from climate (precipitation and temperature) to hydrological variability (discharge). Phase–amplitude interactions are indeed absent in discharge variability, although significant phase–amplitude interactions are found in precipitation and temperature. This suggests that watershed characteristics cancel the negative feedback systems found in precipitation and temperature. This study allows for a multi-timescale representation of hydroclimate variability in France and provides unique insight into the complex nonlinear dynamics of this variability and its predictability.</p>M. FossaB. DieppoisN. MasseiM. FournierB. LaignelJ.-P. VidalCopernicus PublicationsarticleTechnologyTEnvironmental technology. Sanitary engineeringTD1-1066Geography. Anthropology. RecreationGEnvironmental sciencesGE1-350ENHydrology and Earth System Sciences, Vol 25, Pp 5683-5702 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350
spellingShingle	Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 M. Fossa B. Dieppois N. Massei M. Fournier B. Laignel J.-P. Vidal Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
description	<p>Understanding how water resources vary in response to climate at different temporal and spatial scales is crucial to inform long-term management. Climate change impacts and induced trends may indeed be substantially modulated by low-frequency (multi-year) variations, whose strength varies in time and space, with large consequences for risk forecasting systems. In this study, we present a spatial classification of precipitation, temperature, and discharge variability in France, based on a fuzzy clustering and wavelet spectra of 152 near-natural watersheds between 1958 and 2008. We also explore phase–phase and phase–amplitude causal interactions between timescales of each homogeneous region. A total of three significant timescales of variability are found in precipitation, temperature, and discharge, i.e., 1, 2–4, and 5–8 years. The magnitude of these timescales of variability is, however, not constant over the different regions. For instance, southern regions are markedly different from other regions, with much lower (5–8 years) variability and much larger (2–4 years) variability. Several temporal changes in precipitation, temperature, and discharge variability are identified during the 1980s and 1990s. Notably, in the southern regions of France, we note a decrease in annual temperature variability in the mid 1990s. Investigating cross-scale interactions, our study reveals causal and bi-directional relationships between higher- and lower-frequency variability, which may feature interactions within the coupled land–ocean–atmosphere systems. Interestingly, however, even though time frequency patterns (occurrence and timing of timescales of variability) were similar between regions, cross-scale interactions are far much complex, differ between regions, and are not systematically transferred from climate (precipitation and temperature) to hydrological variability (discharge). Phase–amplitude interactions are indeed absent in discharge variability, although significant phase–amplitude interactions are found in precipitation and temperature. This suggests that watershed characteristics cancel the negative feedback systems found in precipitation and temperature. This study allows for a multi-timescale representation of hydroclimate variability in France and provides unique insight into the complex nonlinear dynamics of this variability and its predictability.</p>
format	article
author	M. Fossa B. Dieppois N. Massei M. Fournier B. Laignel J.-P. Vidal
author_facet	M. Fossa B. Dieppois N. Massei M. Fournier B. Laignel J.-P. Vidal
author_sort	M. Fossa
title	Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
title_short	Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
title_full	Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
title_fullStr	Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
title_full_unstemmed	Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France
title_sort	spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in france
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/f4b8063d28bc4547b881e391a899e579
work_keys_str_mv	AT mfossa spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance AT bdieppois spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance AT nmassei spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance AT mfournier spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance AT blaignel spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance AT jpvidal spatiotemporalandcrossscaleinteractionsinhydroclimatevariabilityacasestudyinfrance
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Spatiotemporal and cross-scale interactions in hydroclimate variability: a case-study in France

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