Müller, Thomas ; Friesen, Jan ; Weise, Stephan M. ; Al Abri, Omar ; Bait Said, Ali Bakhit Ali ; Michelsen, Nils (2020)
Stable isotope composition of Cyclone Mekunu rainfall, Southern Oman.
In: Water Resources Research, 56 (12)
doi: 10.1029/2020WR027644
Artikel, Bibliographie
Dies ist die neueste Version dieses Eintrags.
Kurzbeschreibung (Abstract)
Cyclone Mekunu hit the southern Arabian Peninsula in late May 2018 and brought rainfall amounts that accounted for up to 6 times the mean annual precipitation. Coming from the Arabian Sea, a quite underdocumented region with regard to cyclones, the storm eye crossed the Omani coast approximately 80 km east of the border to Yemen. Using automatic samplers, rainfall samples were collected during the event at three locations along a transect almost parallel to the storm track. The stable isotope analyses show a wide range of δ values, with minimum and maximum values of −17.01‰ δ¹⁸O and −1.77‰ δ¹⁸O and −122.2‰ δ²H and −1.6‰ δ²H. On average, rainfall becomes isotopically lighter with elevation, but rather irregularly. In view of high wind speeds probably precluding a gradual rainout of ascending air masses, a “pseudo elevation effect” seems likely. Our measurements expand the known δ value range of local cyclones by about 6‰ for δ¹⁸O and by nearly 50‰ for δ²H. The isotopic composition of the annual Indian Summer Monsoon shows values of −0.93‰ δ¹⁸O to 2.21‰ δ¹⁸O and −2.1‰ δ²H to 23.7‰ δ²H. Thus, there is a clear difference in the dual isotope signatures of the two precipitation systems in the area. Our findings enable an assessment of the impact of cyclones on the hydro(geo)logical system. For the arid Najd area, we demonstrate that the isotopic signatures of groundwater samples fall between those of cyclone and (paleo)monsoon precipitation, suggesting that several rainfall types may have contributed to replenishment.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2020 |
| Autor(en): | Müller, Thomas ; Friesen, Jan ; Weise, Stephan M. ; Al Abri, Omar ; Bait Said, Ali Bakhit Ali ; Michelsen, Nils |
| Art des Eintrags: | Bibliographie |
| Titel: | Stable isotope composition of Cyclone Mekunu rainfall, Southern Oman |
| Sprache: | Englisch |
| Publikationsjahr: | 2020 |
| Ort: | New York |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Water Resources Research |
| Jahrgang/Volume einer Zeitschrift: | 56 |
| (Heft-)Nummer: | 12 |
| Kollation: | 13 Seiten |
| DOI: | 10.1029/2020WR027644 |
| Zugehörige Links: | |
| Kurzbeschreibung (Abstract): | Cyclone Mekunu hit the southern Arabian Peninsula in late May 2018 and brought rainfall amounts that accounted for up to 6 times the mean annual precipitation. Coming from the Arabian Sea, a quite underdocumented region with regard to cyclones, the storm eye crossed the Omani coast approximately 80 km east of the border to Yemen. Using automatic samplers, rainfall samples were collected during the event at three locations along a transect almost parallel to the storm track. The stable isotope analyses show a wide range of δ values, with minimum and maximum values of −17.01‰ δ¹⁸O and −1.77‰ δ¹⁸O and −122.2‰ δ²H and −1.6‰ δ²H. On average, rainfall becomes isotopically lighter with elevation, but rather irregularly. In view of high wind speeds probably precluding a gradual rainout of ascending air masses, a “pseudo elevation effect” seems likely. Our measurements expand the known δ value range of local cyclones by about 6‰ for δ¹⁸O and by nearly 50‰ for δ²H. The isotopic composition of the annual Indian Summer Monsoon shows values of −0.93‰ δ¹⁸O to 2.21‰ δ¹⁸O and −2.1‰ δ²H to 23.7‰ δ²H. Thus, there is a clear difference in the dual isotope signatures of the two precipitation systems in the area. Our findings enable an assessment of the impact of cyclones on the hydro(geo)logical system. For the arid Najd area, we demonstrate that the isotopic signatures of groundwater samples fall between those of cyclone and (paleo)monsoon precipitation, suggesting that several rainfall types may have contributed to replenishment. |
| Freie Schlagworte: | tropical cyclone, stable isotopes, precipitation, paleoclimate, Oman, Arabian Sea |
| ID-Nummer: | Artikel-ID: e2020WR027644 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften 900 Geschichte und Geografie > 910 Geografie, Reisen |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Hydrogeologie |
| Hinterlegungsdatum: | 13 Feb 2024 07:42 |
| Letzte Änderung: | 13 Feb 2024 07:42 |
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| Suche nach Titel in: | TUfind oder in Google |
Verfügbare Versionen dieses Eintrags
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Stable Isotope Composition of Cyclone Mekunu Rainfall, Southern Oman. (deposited 12 Feb 2024 14:04)
- Stable isotope composition of Cyclone Mekunu rainfall, Southern Oman. (deposited 13 Feb 2024 07:42) [Gegenwärtig angezeigt]
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