Spatial variability of northern Iberian rainfall stable isotope values:  Investigating climatic controls on daily and monthly timescales

Moreno, Ana; Iglesias, Miguel; Azorín-Molina, César; Pérez‐Mejías, Carlos; Bartolomé, Miguel; Sancho, Carlos; Stoll, Heather; Cacho, Isabel; Frigola, Jaime; Osácar, Cinta; Muñoz, Arsenio; Delgado‐Huertas, Antonio; Bladé, Ileana; Vimeux, Françoise

doi:10.5194/acp-2020-861

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…The lowest locality in Figure 5 is Borrastre where rainfall sampling site is located at 770 m a.s.l. Rainfall has been collected in Borrastre at per-event basis from June 2011 to May 2016 (Moreno et al, 2020). The weighted average of rainfall-event values is −6.9 for δ 18 O and −46.8 for δD (n = 373).…”

Section: Influence Of Geographical Setting On Rainfall Isotopic Values In An Alpine Sitementioning

confidence: 99%

Underlying Climate Controls in Triple Oxygen (16 O, 17 O, 18 O) and Hydrogen (1 H, 2 H) Isotopes Composition of Rainfall (Central Pyrenees)

et al. 2021

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Studies of rainfall isotopic composition in the Iberian Peninsula are scarce, and to date, none of them have provided analyses of the triple oxygen isotopes, preventing from the complete understanding of current atmospheric processes in this region. We investigate the rainwater δ17O, δ18O, and δD and derived parameters 17O-excess and d-excess in a mountain site in the Central South Pyrenees (Villanúa, Huesca, Spain) to identify the main factors (regional and local) controlling the isotopic composition of precipitation at event scale. The samples were collected on a rainfall-event basis during 2 years (from July 2017 to June 2019), and meteorological variables [temperature, relative humidity (RH), and rainfall amount] were monitored at the sampling site. The δ17O, δ18O, and δD values were higher during summer and lower during the rest of the year. In contrast, the 17O-excess and d-excess were lower during summer and higher during the remaining months. We found that the isotopic parameters are weakly correlated with rainfall amount during each event, but they strongly depend on changes in air temperature and moderately on RH. We consider other factors affecting the isotopic composition of rainfall events that resulted to have an important role, such as the influence of the moisture source and trajectory throughout the variations in the synoptic pattern during rainfall events. This dataset can be useful for further comprehensive atmospheric and hydrological studies, with application to paleoclimatic investigations.

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Section: Influence Of Geographical Setting On Rainfall Isotopic Values In An Alpine Sitementioning

confidence: 99%

Underlying Climate Controls in Triple Oxygen (16 O, 17 O, 18 O) and Hydrogen (1 H, 2 H) Isotopes Composition of Rainfall (Central Pyrenees)

et al. 2021

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“…Under equilibrium conditions, the  18 O value of speleothem carbonate is related to just two variables: the  18 O value of the drip water, and the cave temperature through its control on equilibrium isotope For a constant sea-surface d 18 Osw value, as it is expected for this time period, event-scale monitoring of the isotopic composition of oxygen in the rainwater (δ 18 Or) in different areas of the Iberian Peninsula constrains some of the drivers of rainfall isotopic fractionation (Moreno et al, 2021b). Recent rainfall monitoring surveys in the Central Pyrenees indicate that the values of δ 18 Or show a dependence on temperature equivalent to 0.47-0.52‰/°C, depending on the station (Giménez et al, 2021;Moreno et al, 2021a). This dependence is only partially offset by the empirical value of isotope fractionation during calcite precipitation (−0.18‰/°C; Tremaine et al, 2011) thus allowing to consider temperature as one important factor controlling δ 18 O variability over the last 2500 years.…”

Section: Interpretation Of δ 18 O Datamentioning

confidence: 59%

Reconstructing land temperature changes of the past 2,500 years using speleothems from Pyrenean caves (NE Spain)

Bartolomé

Moreno

Sancho

et al. 2023

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Abstract. Reconstructing of past temperatures at regional scales during the Common Era is necessary to place the current warming in the context of natural climate variability. Here we present a composite record of oxygen isotope variations during last 2500 years based on eight stalagmites from four caves in the central Pyrenees (NE Spain) dominated by temperature variations, with precipitation playing a minor role. The dataset is compared with other Iberian reconstructions that show a high degree of internal coherence with respect to variability at the centennial scale. The Roman Period (especially 0–200 AD), the Medieval Climate Anomaly, and part of the Little Ice Age represent the warmest periods, while the coldest decades occurred during the Dark Ages and most of the Little Ice Age intervals (e.g., 520–550 AD and 1800–1850 AD). Importantly, the LIA cooling or the MCA warming were not continuous or uniform and exhibited high decadal variability. The Industrial Era shows an overall warming trend although with marked cycles and partial stabilization during the last two decades (1990–2010). The strong coherence between the speleothem data, European temperature reconstructions and global tree-ring data informs about the regional representativeness of this new record as Pyrenean past temperature variations. Solar variability and major volcanic eruptions appear to be the two main drivers of climate in southwestern Europe during the past 2.5 millennia.

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“…In this setting, the variance of drip water d 18 O may be useful indicator of drip water residence time (Kost et al 2022). This is because individual rain events feature considerable d 18 O variability (Stoll et al, 2015;Moreno et al, 2020), but mixing within the karst reservoir leads to dampening of this signal to varying degrees at different drip sites. The greatest dampening of event scale variation, ie.…”

Section: Spatial Variation Of Drip Water Optical Properties and Relat...mentioning

confidence: 99%

Climatic and cave setting influences on drip water fluorescent organic matter over an annual cycle in Northwestern Spain and implications for fluorescent laminations in stalagmites

Endres¹,

Jacquin²,

Kaushal³

et al. 2023

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Speleothem fluorescence may elucidate past vegetation dynamics, while microscale fluorescent laminations can provide annually resolved chronology. However, the origin of speleothem fluorescence and the mechanism responsible for the formation of micrometer scale fluorescent lamination in stalagmites, are not well constrained by monitoring studies. Here, we present results from a year-long monthly drip water monitoring from seven locations in La Vallina cave (Northwestern Spain). Fluorescence was quantified by excitation-emission matrices (EEM) spectrofluorometry. Five distinct components were resolved by parallel factor analysis (PARAFAC) modeling, including previously described humic-like, and protein-like components as well as an additional component suggesting a contribution of indigenous fluorescence sourced from the bedrock. Variations in the overlying vegetation and in the water reservoir age contribute to differences in the fluorescent components among different drip sites. While some active stalagmites feature annual to sub-annual fluorescent laminae, the drip water does not support higher abundance of humic-like fluorescence during the rainy season as a primary cause for layer formation. The constancy in humic-like fluorescence, likely to arise due to abiotic interactions with the bedrock, highlights possible other mechanisms on fluorescent layer formation, such as growth rate control over the dilation of the fluorescence signal in the stalagmite.

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Spatial variability of northern Iberian rainfall stable isotope values: Investigating climatic controls on daily and monthly timescales

Cited by 3 publications

References 45 publications

Underlying Climate Controls in Triple Oxygen (16 O, 17 O, 18 O) and Hydrogen (1 H, 2 H) Isotopes Composition of Rainfall (Central Pyrenees)

Underlying Climate Controls in Triple Oxygen (16 O, 17 O, 18 O) and Hydrogen (1 H, 2 H) Isotopes Composition of Rainfall (Central Pyrenees)

Reconstructing land temperature changes of the past 2,500 years using speleothems from Pyrenean caves (NE Spain)

Climatic and cave setting influences on drip water fluorescent organic matter over an annual cycle in Northwestern Spain and implications for fluorescent laminations in stalagmites

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