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| Titel |
Detection and attribution of global change effects on river nutrient dynamics in a large Mediterranean basin |
| VerfasserIn |
R. Aguilera, R. Marcé, S. Sabater |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 13 ; Nr. 12, no. 13 (2015-07-07), S.4085-4098 |
| Datensatznummer |
250118014
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| Publikation (Nr.) |
 copernicus.org/bg-12-4085-2015.pdf |
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| Zusammenfassung |
| Attributing changes in river water quality to specific factors is
challenging because multiple factors act at different temporal and spatial
scales, and it often requires examining long-term series of continuous data.
Data consistency is sometimes hindered by the lack of observations of
relevant water quality variables and the low and uneven sampling frequency
that characterizes many water quality monitoring schemes. Nitrate and
dissolved phosphate concentration time series (1980–2011) from 50 sampling
stations across a large Mediterranean river basin were analyzed to
disentangle the role of hydrology, land-use practices, and global climatic
phenomena on the observed nutrient patterns, with the final aim of
understanding how the different aspects of global change affected nutrient
dynamics in the basin. Dynamic factor analysis (DFA) provided the
methodological framework to extract underlying common patterns in nutrient
time series with missing observations. Using complementary methods such as
frequency and trend analyses, we sought to further characterize the common
patterns and identify the drivers behind their variability across time and
space. Seasonal and other cyclic patterns were identified as well as trends
of increase or decrease of nutrient concentration in particular areas of the
basin. Overall, the impact of global change, which includes both climate
change and anthropogenic impacts, on the dynamics of nitrate concentration
across the study basin was found to be a multifaceted process including
regional and global factors, such as climatic oscillations and agricultural
irrigation practices, whereas impacts on phosphate concentration seemed to
depend more on local impacts, such as urban and industrial activities, and
less on large-scale factors. |
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