Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy)
Abstract. Thus far, studies on climate change have focused mainly on the variability of the atmospheric and surface components of the hydrologic cycle, investigating the impact of this variability on the environment, especially with respect to the risks of desertification, droughts and floods. Conve...
Published in: | Hydrology and Earth System Sciences |
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2012
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ftopenaccessrep:oai:zenodo.org:68558 2023-05-15T17:30:07+02:00 Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) P. De Vita V. Allocca F. Manna S. Fabbrocino 2012-05-11 https://www.openaccessrepository.it/record/68558 https://doi.org/10.5194/hess-16-1389-2012 eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/68558 doi:10.5194/hess-16-1389-2012 info:eu-repo/semantics/openAccess http://www.opendefinition.org/licenses/cc-by CC-BY info:eu-repo/semantics/article publication-article 2012 ftopenaccessrep https://doi.org/10.5194/hess-16-1389-2012 2022-11-23T06:40:29Z Abstract. Thus far, studies on climate change have focused mainly on the variability of the atmospheric and surface components of the hydrologic cycle, investigating the impact of this variability on the environment, especially with respect to the risks of desertification, droughts and floods. Conversely, the impacts of climate change on the recharge of aquifers and on the variability of groundwater flow have been less investigated, especially in Mediterranean karst areas whose water supply systems depend heavily upon groundwater exploitation. In this paper, long-term climatic variability and its influence on groundwater recharge were analysed by examining decadal patterns of precipitation, air temperature and spring discharges in the Campania region (southern Italy), coupled with the North Atlantic Oscillation (NAO). The time series of precipitation and air temperature were gathered over 90 yr, from 1921 to 2010, using 18 rain gauges and 9 air temperature stations with the most continuous functioning. The time series of the winter NAO index and of the discharges of 3 karst springs, selected from those feeding the major aqueducts systems, were collected for the same period. Regional normalised indexes of the precipitation, air temperature and karst spring discharges were calculated, and different methods were applied to analyse the related time series, including long-term trend analysis using smoothing numerical techniques, cross-correlation and Fourier analysis. The investigation of the normalised indexes highlighted the existence of long-term complex periodicities, from 2 to more than 30 yr, with differences in average values of up to approximately ±30% for precipitation and karst spring discharges, which were both strongly correlated with the winter NAO index. Although the effects of the North Atlantic Oscillation (NAO) had already been demonstrated in the long-term precipitation and streamflow patterns of different European countries and Mediterranean areas, the results of this study allow for the ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Hydrology and Earth System Sciences 16 5 1389 1399 |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
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English |
description |
Abstract. Thus far, studies on climate change have focused mainly on the variability of the atmospheric and surface components of the hydrologic cycle, investigating the impact of this variability on the environment, especially with respect to the risks of desertification, droughts and floods. Conversely, the impacts of climate change on the recharge of aquifers and on the variability of groundwater flow have been less investigated, especially in Mediterranean karst areas whose water supply systems depend heavily upon groundwater exploitation. In this paper, long-term climatic variability and its influence on groundwater recharge were analysed by examining decadal patterns of precipitation, air temperature and spring discharges in the Campania region (southern Italy), coupled with the North Atlantic Oscillation (NAO). The time series of precipitation and air temperature were gathered over 90 yr, from 1921 to 2010, using 18 rain gauges and 9 air temperature stations with the most continuous functioning. The time series of the winter NAO index and of the discharges of 3 karst springs, selected from those feeding the major aqueducts systems, were collected for the same period. Regional normalised indexes of the precipitation, air temperature and karst spring discharges were calculated, and different methods were applied to analyse the related time series, including long-term trend analysis using smoothing numerical techniques, cross-correlation and Fourier analysis. The investigation of the normalised indexes highlighted the existence of long-term complex periodicities, from 2 to more than 30 yr, with differences in average values of up to approximately ±30% for precipitation and karst spring discharges, which were both strongly correlated with the winter NAO index. Although the effects of the North Atlantic Oscillation (NAO) had already been demonstrated in the long-term precipitation and streamflow patterns of different European countries and Mediterranean areas, the results of this study allow for the ... |
format |
Article in Journal/Newspaper |
author |
P. De Vita V. Allocca F. Manna S. Fabbrocino |
spellingShingle |
P. De Vita V. Allocca F. Manna S. Fabbrocino Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
author_facet |
P. De Vita V. Allocca F. Manna S. Fabbrocino |
author_sort |
P. De Vita |
title |
Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
title_short |
Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
title_full |
Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
title_fullStr |
Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
title_full_unstemmed |
Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy) |
title_sort |
coupled decadal variability of the north atlantic oscillation, regional rainfall and karst spring discharges in the campania region (southern italy) |
publishDate |
2012 |
url |
https://www.openaccessrepository.it/record/68558 https://doi.org/10.5194/hess-16-1389-2012 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/68558 doi:10.5194/hess-16-1389-2012 |
op_rights |
info:eu-repo/semantics/openAccess http://www.opendefinition.org/licenses/cc-by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/hess-16-1389-2012 |
container_title |
Hydrology and Earth System Sciences |
container_volume |
16 |
container_issue |
5 |
container_start_page |
1389 |
op_container_end_page |
1399 |
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1766125912240160768 |