Тошкент шаҳри атмосфера ёғинлари таркибидаги стабил изотоплар

B. E. Nishonov; S. R. Isabekov; G. U. Umirzakov; L. A. Saidmakhmudova; M. N. Nurmatov

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Stable isotopes in atmospheric precipitation of Tashkent city

Тошкент шаҳри атмосфера ёғинлари таркибидаги стабил изотоплар

B. E. Nishonov, S. R. Isabekov, G. U. Umirzakov, L. A. Saidmakhmudova, M. N. Nurmatov

Hydrometeorological Research Institute, Tashkent, Uzbekistan

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Publisher’s page

Gidrometeorologiya va atrof-muhit monitoringi (Hydrometeorology and Environmental Monitoring)

Date2024

Issue2024, No. 2, pp. 69–77

LanguageUzbek (Russian and English abstracts)

LicenceNot stated

Published byAgency of Hydrometeorological Service of the Republic of Uzbekistan

Highlights

Monthly samples from the Tashkent Observatory station, 2022–2023, compared with data for 1971.
δ²H from −122.73‰ (January 2022) to +16.41‰ (April 2022); δ¹⁸O from −16.34‰ to +1.95‰.
Local meteoric water line: δ²H = 7.33 δ¹⁸O + 5.27; the trend line on Fig. 7 reads y = 7.4325x + 5.1021 (R² = 0.9837).
Mean annual precipitation in Tashkent 423.4 mm: over 41% falls in spring, 36% in winter, 18% in autumn and 5% in summer.

Keywords

precipitation
stable isotopes
isotope hydrology
local meteoric water line
deuterium
δ²H
oxygen-18
δ¹⁸O
Tashkent city

Summary

The authors collected monthly precipitation samples at the Tashkent Observatory weather station in 2022–2023. The 2022 samples were analysed at a laboratory of the Geological Survey of the Slovak Republic and the 2023 samples at the IAEA stable isotope laboratory, both by laser spectroscopy. A PALMEX RS-1C precipitation sampler installed at the station has collected monthly samples since October 2023; the station is one of six Uzbek weather stations added to the GNIP network of the IAEA and the WMO.

δ²H ranged from +16.41‰ to −122.73‰ and δ¹⁸O from +1.95‰ to −16.34‰. The lowest values were measured in January 2022 and the highest in April 2022; values are high in the warm season and low in the cold season, following air temperature.

From the 2022–2023 data together with the 1971 data, the authors derive a local meteoric water line of δ²H = 7.33 δ¹⁸O + 5.27. Its slope is lower than that of the global line, which they attribute to the arid climate and local evaporation. The trend line printed on Fig. 7 reads y = 7.4325x + 5.1021.

Figures (2)

Satellite map of Uzbekistan with six numbered GNIP stations in yellow: Tashkent, Angren, Chotqol, Fergana, Samarkand and Shakhrisabz, and an inset locator map — Fig. 2. Location of GNIP stations in Uzbekistan. Source: B. E. Nishonov et al. (2024).

Scatter plot of δ²H against δ¹⁸O for Tashkent precipitation in 2022, 2023 and 1971, with the global meteoric water line in black and the local line in red — Fig. 7. Correlation of δ¹⁸O and δ²H values in precipitation in Tashkent city (LMWL). Source: B. E. Nishonov et al. (2024).

How to cite

B. E. Nishonov, S. R. Isabekov, G. U. Umirzakov, L. A. Saidmakhmudova and M. N. Nurmatov (2024). Stable isotopes in atmospheric precipitation of Tashkent city. Gidrometeorologiya va atrof-muhit monitoringi (Hydrometeorology and Environmental Monitoring), 2024, No. 2, pp. 69–77. https://nigmi.uz/portfolio/hydrometeorology-and-environmental-monitoring-scientific-journal-%e2%84%96-2-2024-y/