Spatial distribution of the isotopic composition of precipitation and spring water in Greece

Ḏotsika, Elissavet; Lykoudis, S.; Poutoukis, D.

doi:10.1016/j.gloplacha.2009.10.007

Cited by 127 publications

(107 citation statements)

References 42 publications

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“…Gat et al, 2003;Dotsika et al, 2010). Both lakes are evaporated and the intersection of the LEL with the GMWL at around δ 18 O = −8.8‰ and δD = −56.2‰ suggests that both lakes are recharged from groundwater falling about in the midpoint of the range of springs in the region (δ 18 O springs range from −4.9‰ to −11.2‰).…”

Section: Modern Watersmentioning

confidence: 98%

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

et al. 2010

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Abstract.Here we present stable isotope data from three sediment records from lakes that lie along the MacedonianAlbanian border (Lake Prespa: 1 core, and Lake Ohrid: 2 cores). The records only overlap for the last 40 kyr, although the longest record contains the MIS 5/6 transition (Lake Ohrid). The sedimentary characteristics of both lakes differ significantly between the glacial and interglacial phases. At the end of MIS 6 Lake Ohrid's water level was low (high δ 18 O calcite ) and, although productivity was increasing (high calcite content), the carbon supply was mainly from inorganic catchment rock sources (high δ 13 C carb ). During the last interglacial, calcite and TOC production and preservation increased, progressively lower δ 18 O calcite suggest increase in humidity and lake levels until around 115 ka. During ca. 80 ka to 11 ka the lake records suggest cold conditions as indicated by negligible calcite precipitation and low organic matter content. In Lake Ohrid, δ 13 C org are complacent; in contrast, Lake Prespa shows consistently higher δ 13 C org suggesting a low oxidation of 13 C-depleted organic matter in agreement with a general deterioration of climate conditions during the glacial. From 15 ka to the onset of the Holocene, calcite and TOC begin to increase, suggesting lake levels were probably low (high δ 18 O calcite ). In the Holocene (11 ka to present) enhanced productivity is manifested by high calcite and organic matter content. All three cores show an early Holocene characterised by low δ 18 O calcite , apart from the very early Holocene phase in Prespa where the lowest Correspondence to: M. J. Leng (mjl@bgs.ac.uk) δ 18 O calcite occurs at ca. 7.5 ka, suggesting a phase of higher lake level only in (the more sensitive) Lake Prespa. From 6 ka, δ 18 O calcite suggest progressive aridification, in agreement with many other records in the Mediterranean, although the uppermost sediments in one core records low δ 18 O calcite which we interpret as a result of human activity. Overall, the isotope data present here confirm that these two big lakes have captured the large scale, low frequency palaeoclimate variation that is seen in Mediterranean lakes, although in detail there is much palaeoclimate information that could be gained, especially small scale, high frequency differences between this region and the Mediterranean.

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Section: Modern Watersmentioning

confidence: 98%

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

et al. 2010

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“…The cations in this water include Na + , Ca 2+ , Mg 2+ , and K + ; of these, Na + content is highest, between 184.0 and 573. 8 …”

Section: The Chemical Characteristics Of Watermentioning

confidence: 99%

“…Stable isotope compositions can be used to measure the biogeochemical behavior of groundwater, including determining sources and recharge [1][2][3][4][5], the evolution of water quality [6], and transitions between surface and groundwater [7,8]. Geothermal water is abundant deep underground around the city of Kaifeng, Henan Province, China, and contains a variety of minerals that are beneficial to humans [9], so it can be used for drinking, bathing, medical treatment, and health care.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

Wang

Qiao

Chen

et al. 2017

Water

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Geothermal water samples taken from deep aquifers within the city of Kaifeng at depths between 800 and 1650 m were analyzed for conventional water chemical compositions and stable isotopes. These results were then combined with the deuterium excess parameter (d value), and the contribution ratios of different carbon sources were calculated along with distributional characteristics and data on the migration and transformation of geothermal water. These results included the conventional water chemical group, hydrogen, and oxygen isotopes (δD-δ 18 O), dissolved inorganic carbon (DIC) and associated isotopes (δ 13 C DIC ). The results of this study show that geothermal water in the city of Kaifeng is weakly alkaline, water chemistry mostly comprises a HCO 3 -Na type, and the range of variation of δD is between −76.12‰ and −70.48‰, (average: −74.25‰), while the range of variation of δ 18 O is between −11.08‰ and −9.41‰ (average: −10.15‰). Data show that values of d vary between 1.3‰ and 13.3‰ (average: 6.91‰), while DIC content is between 91.523 and 156.969 mg/L (average: 127.158 mg/L). The recorded range of δ 13 C DIC was between −10.160‰ and −6.386‰ (average: −9.019‰). The results presented in this study show that as depth increases, so do δD and δ 18 O, while d values decrease and DIC content and δ 13 C DIC gradually increase. Thus, δD, δ 18 O, d values, DIC, and δ 13 C DIC can all be used as proxies for the burial characteristics of geothermal water. Because data show that the changes in d values and DIC content are larger along the direction of geothermal water flow, so these proxies can be used to indicate migration. This study also shows demonstrates that the main source of DIC in geothermal water is CO 2 thathas a biological origin in soils, as well as the dissolution of carbonate minerals in surrounding rocks. Thus, as depth increases, the contribution of soil biogenic carbon sources to DIC decreases while the influence of carbonate dissolution on DIC increases.

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“…The high mean annual precipitation, resulting from the orographic effect (Dotsika et al, 2010), has probably affected the soil sand content. The upper zone characterized by more steep slopes, high sand content and high precipitation, conditions that encourage Roukos et al: The effect of altitudinal zone on soil properties, species composition and forage production in a subalpine grassland in northwest soil erosion more than the other altitudinal zones.…”

Section: Slope Degree and Soil Propertiesmentioning

confidence: 99%

The Effect of Altitudinal Zone on Soil Properties, Species Composition and Forage Production in a Subalpine Grassland in Northwest Greece

Roukos¹,

Akrida-Demertzi²,

Koutsoukis³

et al. 2017

Appl Ecol Env Res

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Roukos et al. : The effect of altitudinal zone on soil properties, species composition and forage production in a subalpine grassland in northwest Abstract. The impact of altitudinal gradient on soil properties, species composition and forage production was assessed in the subalpine grassland of "Kostilata" in northwestern Greece. The area is important for endemic species and for its traditional transhumant livestock system. Soil properties, species composition and forage production were determined annually and monthly during three consecutive years (April 2013 -October 2015 from thirty experimental plots located in three altitudinal zones (i.e., lower, middle, and upper). Our results suggested that the altitudinal zo ne strongly affected soil physical and chemical properties, species composition and forage production. Indeed, altitude a.s.l. was positively correlated with soil sand content and negatively correlated with forage production. It is found that stocking rate exceeded the grazing capacity, which posed a hazard to grassland sustainability; a belief amplified by the high sand content in soil and a terrain with steep slopes, which would increase the risk of further soil erosion at all altitudinal zones.

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Spatial distribution of the isotopic composition of precipitation and spring water in Greece

Cited by 127 publications

References 42 publications

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

Late Quaternary palaeoenvironmental reconstruction from Lakes Ohrid and Prespa (Macedonia/Albania border) using stable isotopes

Understanding the Burial and Migration Characteristics of Deep Geothermal Water Using Hydrogen, Oxygen, and Inorganic Carbon Isotopes

The Effect of Altitudinal Zone on Soil Properties, Species Composition and Forage Production in a Subalpine Grassland in Northwest Greece

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