Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1016/j.epsl.2023.118534 |
Lizenz  |
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| Titel (primär) | Noble gases in groundwater reflect wet-season temperature in an arid, monsoonal, and mountainous environment |
| Autor | Müller, T.; de Rooij, G.H.; Trauth, N.; Schmidt, M.; Al Badi, H.; Aeschbach, W. |
| Quelle | Earth and Planetary Science Letters |
| Erscheinungsjahr | 2024 |
| Department | HDG; BOSYS |
| Band/Volume | 626 |
| Seite von | art. 118534 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Abstract | Comparing directly measured soil
temperatures with noble gas recharge temperatures (NGTs) inferred from
noble gas concentrations indicates that the infiltrating soil water
equilibrates with soil air near the soil surface during the rainy
season. Therefore, NGTs of groundwater recently recharged by the Indian
Summer Monsoon (ISM) in the Dhofar Mountains in southern Oman reflect
the soil temperatures of the 3-month period and do not represent an
annual mean. This finding highlights the need to account for seasonality
when interpreting NGT data in regions with pronounced dry and wet
seasons. We extend the observations from the southern flank of the Dhofar Mountains to three wells situated on the northern flank of the Dhofar Mountains. Two of these wells yield water of Holocene age that was recharged by the monsoon, their NGT signals are therefore classified as seasonal. The NGT calculated from a third well for recharge conditions during the Last Glacial Maximum (LGM), when the ISM was absent, is approximately 3 °C lower than that of the two Holocene wells. The lower LGM noble gas temperature corresponds well with the lower annual Sea Surface Temperature (SST) in the nearby Arabian Sea. NGTs from published studies from northern Oman are 1–3 °C higher when compared with our data of the same period in the southern Oman. We explain this regional difference of reconstructed temperatures for the LGM and Holocene groundwater with a more continental climatic influence on the infiltration conditions further to the north. The published NGTs from northern Oman show a large temperature difference between the late Holocene and the LGM. In view of our finding of seasonal NGT signals under monsoonal climate, part of this difference may reflect a change in the precipitation regime rather than in air temperature. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=28427 |
| Müller, T., de Rooij, G.H., Trauth, N., Schmidt, M., Al Badi, H., Aeschbach, W. (2024): Noble gases in groundwater reflect wet-season temperature in an arid, monsoonal, and mountainous environment Earth Planet. Sci. Lett. 626 , art. 118534 10.1016/j.epsl.2023.118534 |
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