Calibrated stable water isotope and temperature profiles above fjord water by Ny-Ålesund, Svalbard during February and March 2020

• Main Authors: Seidl, Andrew Walter, Sodemann, Harald, Huss, Jannis M, Thomas, Christoph K
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: cavity ring-down spectroscopy; ECS; Eddy Covariance Station; fiber-optic distributed sensing; ISLAS; ISLAS2020_field_experiment; Norway; Ny-Ålesund; Spitsbergen; precipitation; profiles; stable water isotopes; Svalbard; water vapor; Longyearbyen; Tromsø; Bergen; Andenes; Kongsfjord*; Kongsfjorden; Ny Ålesund; Tundra
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.969399; https://doi.org/10.1594/PANGAEA.969399

During a 5-week measurement campaign (ISLAS2020) in February and March 2020, we collected measurements of the stable isotope composition in atmospheric water in Svalbard and along the Norwegian coast. This included discrete collecting of precipitation at Ny-Ålesund, Longyearbyen, Tromsø, Andenes, Ålesund, and Bergen. Additionally, Ny-Ålesund hosted the primary field experiment of the campaign, with a cavity ring-down spectrometer (CRDS) installation, measuring the in-situ stable isotope composition of the ambient air at three deployment sites. At two of these sites, we performed near-surface vertical profiling of stable water isotopes, to quantify the isotopic gradients above the snow-covered tundra and the open fjord water. These profiles were collocated with high-resolution temperature measurements from fiber-optic distributed sensing methods. At each of the three CRDS deployment sites, automated weather stations logged the ambient meteorological conditions. In addition to the precipitation collected at Ny- Ålesund, we took multiple samples of local snowpack and fjord water (Kongsfjorden). All stable water isotope measurements have been calibrated onto the VSMOW-SLAP scale. Vapor measurements from Ny- Ålesund have also been corrected for mixing ratio - isotope ratio dependency. The data from the ISLAS2020 measurement campaign can facilitate studies on phase changes in the atmospheric water cycle using stable water isotopes as a constraint. This dataset contains observational data from the Fjord deployment site at Ny-Ålesund, Svalbard, Norway, during the ISLAS2020 field experiment. The primary purpose for the collection of this dataset was to obtain near-surface (<5 m) profiles of in-situ stable water isotope measurements in atmospheric water vapor. These profiles were obtained with a cavity ring-down spectrometer installed inside a custom-built profiling system (Seidl et al., 2023). In addition, temperature profiles with high spatial resolution are observed with fiber-optic distributed sensing ...