Briški, Maja; Palatinuš, Iva; Bajo, Petra; Brčić, Vlatko (2025): Stable water isotope data (δ18O and δ2H) of daily precipitation from 2022 to 2024 (NW Croatia) [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.987821 (DOI registration in progress)
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Published: 2025-11-27
Abstract:
This dataset presents the stable water isotopic composition (δ¹⁸O and δ²H) of daily precipitation collected in north-western Croatia (near Samobor town). A total of 288 precipitation samples were collected between December 2022 and November 2024, covering a period of two years. Each sample represents precipitation accumulated over a 24-hour period, with collection typically performed in the early morning. A RAIN SAMPLER RS1B, manufactured by Palmex, was used for sample collection. This rain gauge is specifically designed to collect and store precipitation samples while preventing post-collection evaporation.
Stable isotope analyses of hydrogen and oxygen were conducted using a Picarro L2130-i Isotope Analyzer, providing analytical precisions of ±1‰ for δ²H and ±0.2‰ for δ¹⁸O. The isotopic values are expressed in δ-notation (‰), normalized to the Vienna Standard Mean Ocean Water (VSMOW) international reference standard. For each sample, the deuterium excess (d-excess) was calculated as: d-excess = δ²H – 8 × δ¹⁸O. The Local Meteoric Water Line (LMWL) was determined from the dataset after data screening. Specifically, 31 samples with negative or <1‰ d-excess values and 36 samples with precipitation amounts below 0.2 mm were excluded from the LMWL calculation due to potential evaporative enrichment.
The resulting dataset was used to examine the primary climatic and moisture-source controls on the isotopic composition of precipitation in Croatia, as reported in the research article: "Assessing the influence of climatic parameters and moisture sources on precipitation isotope composition from central Croatia: Insights from a two-year long daily-resolved dataset." Beyond this publication, the dataset provides a valuable resource for hydrogeological, hydrological, climatological, and environmental applications, including isotope-based water balance studies, moisture source tracing, and regional climate variability assessments.
Keyword(s):
Supplement to:
Palatinuš, Iva; Bajo, Petra; Briški, Maja; Belušić, Danijel; Brčić, Vlatko (2025): Assessing the influence of climatic parameters and moisture sources on precipitation isotope composition from central Croatia: Insights from a two-year long daily-resolved dataset. Journal of Hydrology: Regional Studies, 62, 102836, https://doi.org/10.1016/j.ejrh.2025.102836
Related to:
Clark, Ian D; Fritz, Peter (2013): Environmental Isotopes in Hydrogeology. CRC Press, https://doi.org/10.1201/9781482242911
Dansgaard, W (1964): Stable isotopes in precipitation. Tellus, 16(4), 436-468, https://doi.org/10.3402/tellusa.v16i4.8993
Gonfiantini, R (1981): The δ-notation and the mass spectrometric measurement techniques. J.R. Gat, R. Gonfiantini (Eds.), Stable Isotope Hydrology: Deuterium and Oxygen-18 in the Water Cycle, IAEA, Vienna, 35-84
Gröning, Manfred; Lutz, H O; Roller-Lutz, Z; Kralik, M; Gourcy, L; Pöltenstein, L (2012): A simple rain collector preventing water re-evaporation dedicated for δ18O and δ2H analysis of cumulative precipitation samples. Journal of Hydrology, 448-449, 195-200, https://doi.org/10.1016/j.jhydrol.2012.04.041
Hughes, Catherine E; Crawford, Jagoda (2012): A new precipitation weighted method for determining the meteoric water line for hydrological applications demonstrated using Australian and global GNIP data. Journal of Hydrology, 464-465, 344-351, https://doi.org/10.1016/j.jhydrol.2012.07.029
Further details:
Briški, Maja (2025): A δ²H vs. δ¹⁸O diagram showing the Local Meteoric Water Line (LMWL) derived from the filtered dataset. LMWL.png
Funding:
Croatian Science Foundation, grant/award no. HRZZ-UIP-2020-02-7355: Unlocking high-resolution palaeoclimate variability from Nova Grgosova cave multi-proxy speleothem record (UNLOCK-CAVE)
Coverage:
Latitude: 45.827800 * Longitude: 15.685800
Date/Time Start: 2022-12-01T00:00:00 * Date/Time End: 2024-11-30T00:00:00
Minimum HEIGHT above ground: 2 m * Maximum HEIGHT above ground: 2 m
Event(s):
Comment:
Sampling frequency: Daily (24-hour accumulation)
Sampling method: Precipitation collected over 24-hour period using a PALMEX rain collector to prevent evaporation. Collection typically performed in the early morning around 07:00:00
Number of samples: 288
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Instrument(s):
Picarro L2130-i Isotope Analyzer
PALMEX rain collector (evaporation-suppressing design)
HOBO Rain Gauge Data Logger
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Precision:
±1 ‰ for δ2H
±0.2 ‰ for δ18O
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Data processing / Quality control:
The isotopic dataset was filtered to ensure data quality prior to LMWL construction. Samples with negative or <1‰ d-excess values (n = 31) and precipitation amounts < 0.2 mm (n = 36) were excluded from regression analysis.
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Normalization standard:
Vienna Standard Mean Ocean Water (VSMOW)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DATE/TIME | Date/Time | Briški, Maja | Geocode – from around 07:00 | ||
| 2 | DATE/TIME | Date/Time | Briški, Maja | Geocode – until about 07:00 | ||
| 3 | HEIGHT above ground | Height | m | Briški, Maja | Geocode | |
| 4 | δ18O, precipitation | δ18O precip | ‰ SMOW | Briški, Maja | Isotopic liquid water and water vapor analyzer, Picarro, L2130-i | |
| 5 | δ Deuterium, precipitation | δD precip | ‰ SMOW | Briški, Maja | Isotopic liquid water and water vapor analyzer, Picarro, L2130-i | |
| 6 | Deuterium excess, precipitation | d xs precip | ‰ | Briški, Maja | Calculated | |
| 7 | Precipitation | Precip | mm/day | Briški, Maja | Rain gauge | data from the Hobo Rain Gauge Data Logger located near the collection site; data marked with # = data from the Croatian Meteorological and Hydrological Service station in Samobor |
| 8 | Temperature, air, daily mean | TTT day m | °C | Briški, Maja | data from the Croatian Meteorological and Hydrological Service station in Samobor | |
| 9 | Comment | Comment | Briški, Maja |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
1475 data points