the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Integration of global precipitation stable isotope data
Abstract. Precipitation plays a crucial role in the hydrological cycle and is vital for water resources management, climate change research, and ecosystem conservation. Precipitation stable isotopes serve as the "fingerprints" of precipitation, which can clearly trace the formation, transport, and subsequent processes of precipitation. However, due to the scarcity of precipitation stable isotope data, we face challenges of temporal discontinuity and spatial heterogeneity when studying it at large to medium scales. Therefore, we compiled precipitation hydrogen and oxygen stable isotope data (δ18O and δ2H) from 2059 global sites spanning from 1961 to 2023, totaling 141,624 records. Our study indicates significant variations of global precipitation stable isotopes both spatially and temporally. Spatially, the isotopic composition of precipitation in different regions varies significantly due to factors such as geographical location, underlying surface conditions, and atmospheric circulation. Temporally, δ18O and δ2H show decreasing trends, while d-excess shows an increasing trend, with the impact of global temperature rise being very apparent. This precipitation stable isotope dataset provides robust support for our understanding of global precipitation changes and climate change. Through further investigation of precipitation stable isotope data, we hope to uncover more mechanisms and influencing factors of precipitation processes, providing a more accurate basis for the assessment and prediction of climate and water resource changes.
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Status: open (until 28 Sep 2024)
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CC1: 'Comment on essd-2024-171', Gabriel Bowen, 29 Aug 2024
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I will not offer judgement on the scientific merit of this manuscript, but am concerned about the following points:
- The authors do not follow the citation/attribution guidelines provided by the 2 large databases that they 'compile' into the current dataset, namely: https://wateriso.utah.edu/waterisotopes/pages/spatial_db/data_use.html and https://nucleus.iaea.org/wiser (note that the latter link requires sign-in).
- The manuscript fails to reference or discuss much of the extensive literature, old and new, that deals with spatial (e.g., Rozanski et al., 1993; Bowen and Revenaugh, 2003; Bowen et al., 2019, Terzer et al., 2021, and many, many others) and temporal (Rozanski et al., 1992; Putman et al., 2021, many other regional studies) patterns in global precipitation isotope ratios.
I don't believe that publication of the current work is appropriate until these issues are resolved.
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Bowen, G. J., Cai, Z., Fiorella, R. P., & Putman, A. L. (2019). Isotopes in the Water Cycle: Regional- to Global-Scale Patterns and Applications. Annual Review of Earth and Planetary Sciences, 47, 453-479. https://doi.org/10.1146/annurev-earth-053018-060220
Bowen, G. J., & Revenaugh, J. (2003). Interpolating the isotopic composition of modern meteoric precipitation. Water Resources Research, 39, 1299. https://doi.org/10.1029/2003WR002086
Putman, A. L., Bowen, G. J., & Strong, C. (2021). Local and regional modes of hydroclimatic change expressed in modern multidecadal precipitation oxygen isotope trends. Geophysical Research Letters, 48(5). https://doi.org/10.1029/2020gl092006
Rozanski, K., Araguas-Araguas, L., & Gonfiantini, R. (1992). Relation-between long-term trends of oxygen-18 isotope composition of precipitation and climate. Science, 258(5084), 981-985.
Rozanski, K., Araguás-Araguás, L., & Gonfiantini, R. (1993). Isotopic patterns in modern global precipitation. In Climate Change in Continental Isotopic Records (Vol. 78, pp. 1-36). AGU. https://doi.org/10.1029/GM078p0001
Terzer‐Wassmuth, S., Wassenaar, L. I., Welker, J. M., & Araguás‐Araguás, L. J. (2021). Improved high‐resolution global and regionalized isoscapes of δ18O , δ2H. Hydrological Processes, 35(6). https://doi.org/10.1002/hyp.14254
Citation: https://doi.org/10.5194/essd-2024-171-CC1
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Integration of global precipitation stable isotope data Guofeng Zhu https://doi.org/10.17632/9gxtc4xzv9.1
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