Isotopic typology of the precipitation in the Western Mediterranean Region at three different time scales

Celle-Jeanton, Hélène; Travi, Yves; Blavoux, Bernard

doi:10.1029/2000gl012407

Cited by 217 publications

(109 citation statements)

References 11 publications

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“…3). Values slightly enriched in 18 O compared to measured δ v suggest a probable evaporation of rainfall in the atmosphere, a classical feature for small summer rainfall events (Celle-Jeanton et al, 2001), while values slightly depleted in deuterium compared to measured δ v points to the influence of an enriched vapour at ground level.…”

Section: Resultsmentioning

confidence: 99%

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

2015

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Abstract. Stable isotopes of water vapour represent a powerful tool for tracing atmospheric vapour origin and mixing processes. Laser spectrometry recently allowed high timeresolution measurements, but despite an increasing number of experimental studies, there is still a need for a better understanding of the isotopic signal variability at different time scales. We present results of in situ measurements of δ 18 O and δD during 36 consecutive days in summer 2011 in atmospheric vapour of a Mediterranean coastal wetland exposed to high evaporation (Camargue, Rhône River delta, France). The mean composition of atmospheric vapour (δ v ) is δ 18 O = −14.66 ‰ and δD = −95.4 ‰, with data plotting clearly above the local meteoric water line on a δ 18 O-δD plot, and an average deuterium excess (d) of 21.9 ‰. Important diurnal d variations are observed, and an hourly time scale analysis is necessary to interpret the main processes involved in its variability. After having classified the data according to air mass back trajectories, we analyse the average daily cycles relating to the two main meteorological situations, i.e. air masses originating from North Atlantic Ocean and Mediterranean Sea. In both situations, we show that diurnal fluctuations are driven by (1) the influence of local evaporation, culminating during daytime, and leading to an increase in absolute water vapour concentration associated to a δ v enrichment and d increase; (2) vertical air mass redistribution when the Planetary Boundary Layer collapses in the evening, leading to a d decrease, and (3) dew formation during the night, producing a δ v depletion with d remaining stable. Using a twocomponent mixing model, we calculate the average composition of the locally evaporated vapour (δ E ). We find higher d (E) under North Atlantic air mass conditions, which is consistent with lower humidity conditions. We also suggest that δ v measured when the PBL collapses is the most representative of a regional signal. Strong, cold and dry winds coming from the north bring an isotopically depleted vapour, while light, warm and wet winds coming from the south bring an isotopically enriched vapour. Under northern conditions, a strong advection rate dilutes the contribution of the locally evaporated vapour (δ E ) to the ambient moisture (δ v ). The higher d values measured under northern conditions, compared to the Mediterranean situation, thus results from the combination of a higher d in both local and regional vapour. This depiction of typical daily cycles of water vapour isotopic composition can be used as a framework for further quantitative analyses of vapour sources during specific days.

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Section: Resultsmentioning

confidence: 99%

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

2015

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“…The Bonifacio seawater signature (Santoni, 2013) is plotted in blue. The dotted line and the black line represent the Western Mediterranean Meteoric Water Line (WMMWL) from (Celle-Jeanton et al, 2001) and the Global Meteoric Water Line respectively.…”

Section: List Of Figuresmentioning

confidence: 99%

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Santoni

Huneau

Garel

et al. 2016

Journal of Hydrology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…To achieve this, sampling frequency needs to be at least high enough to resolve different precipitation events ("event-based" sampling). For instance, only by using such event-based data were Celle-Jeanton et al (2001) able to demonstrate characteristic differences in the isotopic com- position of rainwater in the Mediterranean coastal region of France the authors attributed to different types of synoptic weather systems. As the synoptic weather situation can change rather quickly, monthly rainwater isotope data would have most likely been of insufficient temporal resolution to identify this relationship between isotope composition and synoptics.…”

Section: Summary and Potential Applicationsmentioning

confidence: 99%

Technical note: GUARD – an automated fluid sampler preventing sample alteration by contamination, evaporation and gas exchange, suitable for remote areas and harsh conditions

Hartmann

Luetscher

Wachter

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. Automated water sampling devices adapted to field operation have proven highly useful for environmental research as well as in the public and private sectors, where natural or artificial waters need to be tested regularly for compliance with environmental and health regulations. Such autosamplers are already available on the market in slightly differing versions, but none of these devices are capable of sealing the collected samples to prevent sample alteration by contamination, evaporation or gas exchange. In many sampling cases, however, this feature is essential, for instance for studying the hydrological cycle based on isotopes in rainwater, or for monitoring waters contaminated with toxic gases or other volatile compounds detrimental to biota and human health. Therefore, we have developed a new mobile autosampler, which injects water samples directly into airtight vials, thus preventing any sample alteration. Further advantages include low production costs, compact dimensions and low weight allowing for easy transport, a wide range of selectable sampling intervals as well as a low power consumption, which make it suitable for long-term applications even in remote areas and harsh (outdoor) conditions due to its heavy-duty water-proof casing. In this paper, we demonstrate (1) the sampler's mechanical functioning, (2) the long-term stability of the collected samples with regard to evaporation and gas exchange and (3) the potential of our device in a wide variety of applications drawing on laboratory and field experiments in different karst caves, which represent one of the most challenging sampling environments.

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Isotopic typology of the precipitation in the Western Mediterranean Region at three different time scales

Abstract: Abstract. Environmental isotopes (180,2Hamount, continental and altitude effects, air masses origin. The

Cited by 217 publications

References 11 publications

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

Deuterium excess in the atmospheric water vapour of a Mediterranean coastal wetland: regional vs. local signatures

Residence time, mineralization processes and groundwater origin within a carbonate coastal aquifer with a thick unsaturated zone

Technical note: GUARD – an automated fluid sampler preventing sample alteration by contamination, evaporation and gas exchange, suitable for remote areas and harsh conditions

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