Trends of daily precipitation concentration in Central-Southern Chile

Sarricolea, Pablo; Meseguer-Ruiz, Óliver; Serrano‐Notivoli, Roberto; Soto, María Victoria López; Martín‐Vide, Javier

doi:10.1016/j.atmosres.2018.09.005

Cited by 55 publications

(43 citation statements)

References 36 publications

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“…Indices such as the concentration index (CI) (Martín‐Vide, ; Monjo and Martín‐Vide, ; Sarricolea et al, ) based on the Gini Index illustrate the weight of the rainiest days among all rainy days in a time series. The chronological order of the numerical values of a temporal series is not considered by many indices that quantify their variability, even though this plays an essential role in their climatic and geographical implications.…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution and trends of different precipitation variability indices based on daily data in Northern Chile between 1966 and 2015

Meseguer-Ruiz

Ponce-Philimon

Guijarro

et al. 2019

Intl Journal of Climatology

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Northern Chile is one of the most arid regions in the world, as it includes the Atacama Desert. At high elevations, most precipitation is observed only during a short period of the year, from December until March. This renders water availability a major concern for policymakers. Accumulated rainfall varies considerably from one year to another, and for this reason, climate projections have a very low degree of confidence in this area. Consequently, in this region, it is more interesting to study the irregularity of precipitation itself than accumulated rainfall values, as they express in a clearer way the behaviour of precipitation. According to daily data from 161 meteorological stations, four irregularity indices of precipitation were calculated: concentration index, entropy, persistence index, and fractal dimension. These indices were measured according to observed values, and their spatial distribution was subsequently determined by interpolating following multivariate regression models that consider different geographical variables such as latitude, distance to the Amazon Basin, elevation, orientation, and curvature. The temporal trends of each index and for each meteorological station were also calculated, displaying different results depending on the latitude and elevation. These changes agree with the observed modifications on the inter‐tropical atmospheric circulation and with changes in the precipitation diurnal cycle. These results will help improve climate projections for this region, in the process facilitating the development of more accurate climate models and informing the formulation of water management policies.

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Section: Introductionmentioning

confidence: 99%

Spatial distribution and trends of different precipitation variability indices based on daily data in Northern Chile between 1966 and 2015

Meseguer-Ruiz

Ponce-Philimon

Guijarro

et al. 2019

Intl Journal of Climatology

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“…The CI values calculated in the present work (0.477÷0.723) fall within the range (0.38÷0.87) obtained in a global analysis by Monjo and Martin‐Vide (); they are similar to the ones computed in several studies on the whole of Europe (Cortesi et al, ) or at national and sub‐national scale in the Mediterranean basin (Italy—Coscarelli and Caloiero, ; Algeria—Benhamrouche et al, ; Spain—Serrano‐Notivoli et al, ). Moreover, these results agree with the ones obtained in several world countries such as the United States (Royé and Martin‐Vide, ), New Zealand (Caloiero, ) and Chile (Sarricolea et al, ). Finally, different values have been detected in Turkey (Yesilirmak and Atatanir, ), Ukraine (Vyshkvarkova and Voskresenskaya, ), Malaysia (Suhaila and Jemain, ), Peru (Zubieta et al, ), Iran (Alijani et al, ) and China (Zhang et al, ; Fu et al, ) which showed very high CI values, ranging from 0.74 to 0.80.…”

Section: Resultsmentioning

confidence: 96%

“…Moreover, CI can be considered as an indicator of torrentiality and erosivity (De Luis et al, 2010) and its analysis is thus paramount in those areas presenting a Mediterranean climate (Martin-Vide, 1994). In order to analyse the characteristics of precipitation, the CI has been applied on a large scale (Burgueño et al, 2010;Cortesi et al, 2012;Monjo and Martin-Vide, 2016) and in several countries such as Spain (Serrano-Notivoli et al, 2018), Italy (Coscarelli and Caloiero, 2012), Iran (Alijani et al, 2008), China (Zhang et al, 2009;Shi et al, 2015), Malaysia (Suhaila and Jemain, 2012), Chile (Sarricolea et al, 2019), Algeria (Benhamrouche et al, 2015), New Zealand (Caloiero, 2014) and Turkey (Yesilirmak and Atatanir, 2016).…”

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confidence: 99%

Spatial and temporal variability of daily precipitation concentration in the Sardinia region (Italy)

Caloiero

Coscarelli

Gaudio

2019

Intl Journal of Climatology

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Recent studies evidenced that extreme daily rainfall often increases in spite of a decrease of the total rainfall. For this reason, the analysis of daily precipitation concentration is an important issue in climate research and can be useful to evaluate risks linked to extreme rainfall events. In this paper, an analysis of the spatial and temporal variability of the daily precipitation concentration in the Sardinia region, the second largest island in the Mediterranean Sea, has been performed for the period 1922–2011 by applying the Concentration Index. First, the CI has been evaluated at annual and seasonal scale. Then, the coefficient of variation, and the 5th and 95th percentiles of the annual CI values were calculated and mapped as a set of descriptors of variability and extreme characterization of precipitation concentration across the study area. Finally, in order to evaluate the temporal evolution of the CI, a trend analysis has been also performed using the Mann–Kendall test. Results show CI values ranging from a minimum of 0.477 to a maximum of 0.723. Spatially, the region can be divided in two parts with opposite behaviours: the western side characterized by a more uniform temporal distribution of rainfall intensity and the eastern side with the most critical intensity and aggressiveness of rainfall. From a seasonal point of view, this spatial gradient was evidenced in winter, spring and autumn while summer showed a more homogeneous spatial distribution of CI. The spatial distribution of the coefficient of variation did not show any spatial gradient between the two sides of the region, both at annual and seasonal scale. As regards the trend analysis, a marked positive trend of the CI has been detected, thus indicating a tendency towards more intense and aggressive rainfall. Copyright © 2019 John Wiley & Sons, Ltd.

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“…Daily precipitation at Santo Domingo (33°39′S 71°36′W)-the nearest weather station to Laguna Matanzaswas compiled using the redPrec R package 85,86 (Fig. 1d).…”

Section: Methodsmentioning

confidence: 99%

A combined approach to establishing the timing and magnitude of anthropogenic nutrient alteration in a mediterranean coastal lake- watershed system

Fuentealba

Latorre

Frugone-Álvarez

et al. 2020

Sci Rep

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Human activities have profoundly altered the global nutrient cycle through Land Use and cover Changes (LUCCs) since the industrial revolution and especially during the Great Acceleration (1950 CE). Yet, the impact of such activities on terrestrial and aquatic ecosystems above their ecological baselines are not well known, especially when considering the response of these systems to the intensity of LUCCs on nutrient cycles. Here, we used a multiproxy approach (sedimentological, geochemical and isotopic analyses, historical records, climate data, and satellite images) to evaluate the role that LUCCs have on nitrogen (n) cycling in a coastal mediterranean watershed system of central chile over the last two centuries. Despite long-term anthropogenic use (agriculture, cattle grazing) in the Matanzas watershed-lake system, these LUCC appear to have had little impact on nutrient and organic matter transfer since the Spanish Colonial period. In contrast, the largest changes in N dynamics occurred in the mid-1970s, driven by the replacement of native forests and grasslands by government-subsidized tree plantations of introduced Monterey pine (Pinus radiata) and eucalyptus (Eucalyptus globulus). These LUCC had major impacts on the transfer of organic matter (which increased by 9.4%) and nutrients (as revealed by an increase in total N) to Laguna Matanzas. Our study shows that the presence of anthropogenic land use/cover changes do not necessarily alter nutrient supply and n availability per se but rather it is the magnitude and intensity of such changes that produce major impact on these processes in these mediterranean watersheds.

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Trends of daily precipitation concentration in Central-Southern Chile

Cited by 55 publications

References 36 publications

Spatial distribution and trends of different precipitation variability indices based on daily data in Northern Chile between 1966 and 2015

Spatial distribution and trends of different precipitation variability indices based on daily data in Northern Chile between 1966 and 2015

Spatial and temporal variability of daily precipitation concentration in the Sardinia region (Italy)

A combined approach to establishing the timing and magnitude of anthropogenic nutrient alteration in a mediterranean coastal lake- watershed system

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