The influences of the Southern and North Atlantic Oscillations on climatic surface variables in Turkey

Karabörk, M. Çağatay; Kahya, Ercan; Karaca, Mehmet

doi:10.1002/hyp.5560

Cited by 80 publications

(57 citation statements)

References 29 publications

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“…In the Mediterranean area, a correlation between the NAO, precipitation, river discharges and lake levels was also found in the Middle East and in Turkey (Cullen and deMenocal, 2000;Cullen et al, 2002;Karabörk et al, 2005;Türkes and Erlat, 2005;Kücük et al, 2009). A strong interdependence among the NAO, precipitation, river discharges and air temperature in some southern Italy regions (Brandimarte et al, 2011;Caloiero et al, 2011) was discovered.…”

Section: Introductionmentioning

confidence: 92%

Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy)

Vita

Allocca

Manna

et al. 2012

Hydrol. Earth Syst. Sci.

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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 establishment of a link between a large-scale atmospheric cycle and the groundwater recharge of carbonate karst aquifers. Consequently, the winter NAO index could also be considered as a proxy to forecast the decadal variability of groundwater flow in Mediterranean karst areas.

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Section: Introductionmentioning

confidence: 92%

Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy)

Vita

Allocca

Manna

et al. 2012

Hydrol. Earth Syst. Sci.

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“…Previously, much work had focused on North American and European countries owing to the ready availability of abundant data. With the expansion of the global climatic datasets, a worldwide increase in the number of studies on climate variability has taken place, leading to a better understanding of the climate system (Jones and Mann 2004;Charlson and Wigley 1994;Kahya and Karabörk 2001;Kalaycı and Kahya 2006;Karabörk et al 2005;Karaca et al 1995Karaca et al , 2000Karl et al 1993;Kiehl et al 2000;Nasrallah and Balling 1993;Tayanç and Toros 1997;Tayanç et al , 1998aWigley 2005;Ezber et al 2006;WMO 1992).…”

Section: Introductionmentioning

confidence: 98%

Climate change in Turkey for the last half century

et al. 2008

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Climate change and its urban-induced bias in selected Turkish cities is studied with a quality controlled temperature and precipitation data of Turkish stations in the period of 1950-2004. These stations are classified into two groups according to their populations; S1, including rural and suburban stations and S2, including large urban stations. Moving average signals, 365-day, and their digital low pass filtered versions are produced to eliminate the short term fluctuations and examine the possible trends or anomalies in climate data. Furthermore, 'relative difference' signals are introduced and applied to temperature and precipitation series to observe the actual local changes in the climate data independent from largescale effects. Mann-Kendall test statistics are calculated for maximum, minimum, mean temperature and precipitation series and plotted on maps to determine any spatial trend patterns. Signal analysis show a cool period extending from early 1960s till 1993, generally with the lowest temperature values on 1992-1993 owing to the eruption of Mount Pinatubo. A last decade significant warming trend is observed in both of the series, S1 and S2, leading to 2000-2002 temperatures to be recorded as Climatic Change (2009) 94:483-502 maximums in record history. The variability of urban precipitation series is generally larger than the rural ones, suggesting that urban stations can experience more frequent and severe droughts and floods. Though not significant, an increase in the urban precipitation compared to the rural one is also found. Spatial analysis resulted in significant warming in southern and southeastern parts of the country. Particularly, minimum temperature series show significant warming in almost all of the regions indicating the effect of urbanization. Significant decreases of precipitation amounts in the western parts of Turkey, such as Aegean and Trachea regions, are found. On the other hand, some Turkish northern stations show increases in precipitation of which some are significant.

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“…In the Mediterranean region a negative relationship between the NAO and river discharges has been found in the Middle East (Cullen and DeMenocal, 2000;Cullen et al, 2002) and in Turkey (Karabörk et al, 2005;Kalayci and Kahya, 2006), where lake levels have also been related to the NAO (Kücük et al, 2009). Within the Iberian Peninsula (hereafter IP) the influence of the NAO on river discharges has been analyzed in studies of various basins (López-Moreno et al, 2007;Trigo et al, 2004;Morán-Tejeda et al, 2011), where reasonably high correlations have been found between the NAO and streamflows, particularly in winter.…”

Section: Introductionmentioning

confidence: 99%

The response of Iberian rivers to the North Atlantic Oscillation

Lorenzo‐Lacruz

Vicente‐Serrano

López‐Moreno

et al. 2011

Hydrol. Earth Syst. Sci.

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Abstract. In this study we analyzed the influence of the North Atlantic Oscillation (NAO) on the streamflow in 187 sub-basins of the Iberian Peninsula. Monthly and one-month lagged correlations were conducted to assess the spatiotemporal extent of the NAO influence on Iberian river discharges. Analysis of the persistence of the winter NAO throughout the year was also undertaken, together with analysis of streamflow anomalies during positive and negative NAO phases. Moving-window correlation analyses were conducted to assess potential changes in the temporal evolution of the NAO influence on Iberian streamflows. The results show that the NAO has a large impact on surface water resources throughout the Iberian Peninsula during winter, and in the Atlantic watershed during autumn. We showed that water resources management and snowmelt are causing the persistent dependence of streamflows on the previous winter NAO. We found that strongly positive streamflow anomalies occurred during winter, especially in the Atlantic watershed, and provide evidence of non-stationarity and spatial variability in the NAO influence on Iberian water resources.

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The influences of the Southern and North Atlantic Oscillations on climatic surface variables in Turkey

Cited by 80 publications

References 29 publications

Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy)

Coupled decadal variability of the North Atlantic Oscillation, regional rainfall and karst spring discharges in the Campania region (southern Italy)

Climate change in Turkey for the last half century

The response of Iberian rivers to the North Atlantic Oscillation

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