Global and local meteoric water lines for δ <superscript>17</superscript> O/δ <superscript>18</superscript> O and the spatiotemporal distribution of Δ' <superscript>17</superscript> O in Earth's precipitation.
In: Scientific reports, Jg. 13 (2023-11-04), Heft 1, S. 19056
Online
academicJournal
Zugriff:
Recently, δ 17 O and its excess (Δ' 17 O) have become increasingly significant "triple-oxygen-isotope" indicators of distinctive hydrological processes in hydrology and climatology. This situation mirrors the research regarding δ 18 O and δ 2 H in the 1960s towards a solid theoretical base and a surge in application examples and field studies worldwide. Currently, systematic global measurements for δ 17 O in precipitation are still lacking. As a result, attempts have been made to define a Global δ 17 O/δ 18 O Meteoric Water Line (GMWL), often by using regional or local datasets of varying systematicity. Different definitions of the global reference slope (λ ref ) for determining Δ' 17 O values have been proposed, by ongoing debate around a proposed consensus value of 0.528. This study used worldwide samples archived in the IAEA Global Network of Isotopes in Precipitation (GNIP) to (a) derive a δ 17 O/δ 18 O GMWL based on four-year monthly records from 66 GNIP stations, (b) formulate local δ 17 O/δ 18 O meteoric water lines (LMWL) for these stations' areas, and (c) evaluate regional and seasonal variations of Δ' 17 O in precipitation. The GMWL for δ 17 O/δ 18 O was determined to be δ' 17 O = 0.5280 ± 0.0002 δ' 18 O + 0.0153 ± 0.0013, in keeping with the consensus value. Furthermore, our results suggested that using a line-conditioned 17 O-excess is a viable alternative over the global λ ref in the context of regional hydrology and paleoclimatology interpretations; however, without challenging the global λ ref as such.
(© 2023. The Author(s).)
Titel: |
Global and local meteoric water lines for δ <superscript>17</superscript> O/δ <superscript>18</superscript> O and the spatiotemporal distribution of Δ' <superscript>17</superscript> O in Earth's precipitation.
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Autor/in / Beteiligte Person: | Terzer-Wassmuth, S ; Araguás-Araguás, LJ ; Wassenaar, LI ; Stumpp, C |
Link: | |
Zeitschrift: | Scientific reports, Jg. 13 (2023-11-04), Heft 1, S. 19056 |
Veröffentlichung: | London : Nature Publishing Group, copyright 2011-, 2023 |
Medientyp: | academicJournal |
ISSN: | 2045-2322 (electronic) |
DOI: | 10.1038/s41598-023-45920-8 |
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