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| Created: | Jul 31, 2025 at 10:53 p.m. (UTC) | |
| Last updated: | Jul 31, 2025 at 11:12 p.m. (UTC) | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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Abstract
The study area (218 km2) is located on the northwestern part of the Central Valley of Costa Rica. The region is characterized by two well-defined seasons: dry (December to April) and wet (May to November). Daily precipitation samples (N=793) were collected from April 2021 to December 2022. Three passive rain collectors (Palmex Ltd., Croatia; Gröning et al., 2012) were installed at 938 m a.s.l (AC), 1,804 m a.s.l (AF), and 2,532 m a.s.l (VP). Precipitation and groundwater samples were stored below 6°C in 50 mL HDPE bottles with no headspace and plastic inserts to avoid evaporation. Samples were analyzed at the Stable Isotopes Research Group laboratory at the Universidad Nacional (Heredia, Costa Rica) using an IWA-45EP water analyzer (Los Gatos Research, Inc., California, USA). The precision was ±0.80‰ for d2H and ±0.08‰ for d18O (1sigma; 5 injections). Isotopic reference materials, USGS45 (d2H=−10.30‰, d18O=−2.24‰), USGS47 (d2H=−150.2‰, d18O=−19.80‰), and calibrated secondary standard PGW (d2H=−52.64 ‰, d18O=−8.20‰), were used for data normalization and quality control. 18O/16O and 2H/1H ratios are presented in delta notation relative to the VSMOW-SLAP scale and expressed as per mile (‰). Deuterium excess was calculated as d-excess= d2H - 8·d18O . Long-term d2H, d18O, and d-excess precisions are 0.29‰, 0.08‰, and 0.65‰, respectively.
Subject Keywords
Coverage
Spatial
Temporal
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Credits
Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
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| Universidad Nacional de Costa Rica |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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