Surface and Groundwater in Volcanic Islands: Water from Azores Islands

Antunes, P.; Carvalho, Rejane Andrade de

doi:10.1007/978-3-642-32226-6_13

Cited by 2 publications

(2 citation statements)

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“…Groundwater is the main resource in the Azores islands for water supply and ecosystem support. On small islands, basal aquifers are characterized by a lens-shaped body that floats above the saltwater and where aquifers are relatively small (Antunes & Carvalho, 2018).…”

Section: Climatementioning

confidence: 99%

“…Groundwater is the main resource in the Azores islands for water supply and ecosystem support. On small islands, basal aquifers are characterized by a lens‐shaped body that floats above the saltwater and where aquifers are relatively small (Antunes & Carvalho, ). Small volcanic islands face unique challenges in the assessment and management of their hydrological systems and water resources, which distinguish them from other regions around the world.…”

Section: Introductionmentioning

confidence: 99%

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Orographic distillation and spatio‐temporal variations of stable isotopes in precipitation in the North Atlantic

Antunes

Boutt

Rodrigues

2019

Hydrological Processes

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Little is known about the spatial and temporal variability of the stable isotopic composition of precipitation in the North Atlantic and its relationship to the North Atlantic Oscillation (NAO) and anthropogenic climate change. The islands of the Azores archipelago are uniquely positioned in the middle of the North Atlantic Ocean to address this knowledge gap. A survey of spatial and temporal variability of the stable isotope composition of precipitation in Azores is discussed using newly presented analyses along with Global Network of Isotopes in Precipitation data. The collected precipitation samples yield a new local meteoric water line (δ2H = 7.1 * δ18O + 8.46) for the Azores region and the North Atlantic Ocean. The annual isotopic mean of precipitation shows a small range for the unweighted and precipitation mass‐weighted δ18O‐H2O values. Results show an inverse relation between the monthly δ18O‐H2O and the amount of precipitation, which increases in elevation and into the interior of the island. Higher amounts of precipitation (from convective storm systems) do not correspond to the most depleted values of stable isotopes in precipitation. Precipitation shows an orographic effect with depleted δ18O‐H2O values related to the Rayleigh effect. Monthly δ18O‐H2O values for individual precipitation sampling stations show little relationship to air temperature. Results show a local source of moisture during the summer with the characteristics of the first vapour condensate. The stable isotope composition of precipitation is strongly correlated to the NAO index, and δ18O‐H2O values show a statistically significantly trend towards enrichment since 1962 coincident with the increased air temperature and relative humidity due to climate change. Results are in line with observations of increasing sea surface temperature and relative humidity.

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Section: Climatementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%