A membrane inlet laser spectrometer for in situ measurement of triple water isotopologues

IF 2.1 3区地球科学 Q2 LIMNOLOGY Limnology and Oceanography: Methods Pub Date : 2024-11-27 DOI:10.1002/lom3.10660

Axel Wohleber, Camille Blouzon, Julien Witwicky, Patrick Ginot, Nicolas C. Jourdain, Roberto Grilli

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Abstract

We describe a novel compact autonomous in situ sensor for semi-continuous measurement of water isotopes (δD, δ¹⁸O, and δ¹⁷O) in liquid water. The sensor relies on a dual-inlet water vapor injection system based on the pervaporation through a semi-permeable membrane, and on the water vapor composition analysis using a dedicated optical feedback cavity enhanced absorption spectrometer. The sensor has dimensions of 165 mm diameter and 550 mm long, for a weight of ∼ 8 kg. A titanium casing allows applications down to 6000 m deep for a total effective weight of 45 (23) kg in air (water). It has a power consumption of ∼ 40 W, and an autonomy of 10–12 h which is ensured by a dedicated Li-ion battery pack. The sensor is equipped with single-pair high-speed digital subscriber line communication for telemetry purposes. The instrument provides an accuracy of 0.3‰ (2σ) for all water isotopes with a 9-min integration time. The instrument is suitable for investigating the freshwater cycle in the ocean, and in particular the transformation of ocean water masses related to iceberg and ice shelf melting.

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来源期刊

Limnology and Oceanography: Methods 地学-海洋学

CiteScore

4.80

自引率

3.70%

发文量

审稿时长

3 months

期刊介绍： Limnology and Oceanography: Methods (ISSN 1541-5856) is a companion to ASLO''s top-rated journal Limnology and Oceanography, and articles are held to the same high standards. In order to provide the most rapid publication consistent with high standards, Limnology and Oceanography: Methods appears in electronic format only, and the entire submission and review system is online. Articles are posted as soon as they are accepted and formatted for publication. Limnology and Oceanography: Methods will consider manuscripts whose primary focus is methodological, and that deal with problems in the aquatic sciences. Manuscripts may present new measurement equipment, techniques for analyzing observations or samples, methods for understanding and interpreting information, analyses of metadata to examine the effectiveness of approaches, invited and contributed reviews and syntheses, and techniques for communicating and teaching in the aquatic sciences.

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