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General and specific comments to egusphere-2023-2030

Zarina SaidaliyevaDepartment of Geography and Environmental Science, University of Reading, Reading, RG66AB, UKMaria ShahgedanovaDepartment of Geography and Environmental Science, University of Reading, Reading, RG66AB, UKYapiyev, VadimDepartment of Geography and Environmental Science, University of Reading, Reading, RG66AB, UKWade, Andrew J.Department of Geography and Environmental Science, University of Reading, Reading, RG66AB, UKAkbarov, FakhriddinEsenaman uulu, MukhammedCentral-Asian Institute for Applied Geosciences, Bishkek, 720027, KyrgyzstanKalashnikova, OlgaCentral-Asian Institute for Applied Geosciences, Bishkek, 720027, KyrgyzstanKapitsa, VassiliyCentral Asian Regional Glaciological Centre Under the Auspices of UNESCO, Almaty, 050010, KazakhstanKasatkin, NikolayCentral Asian Regional Glaciological Centre Under the Auspices of UNESCO, Almaty, 050010, KazakhstanRakhimov, IlkhomiddinInstitute of Water Problems, Hydropower and Environment, Dushanbe, 734025, TajikistanSatylkanov, RysbekSayakbaev, DaniiarSemakova, EleonoraUlugh Beg Astronomical Institute of the Uzbekistan Academy of Science Tashkent, 100052, UzbekistanSeverskiy, IgorCentral Asian Regional Glaciological Centre Under the Auspices of UNESCO, Almaty, 050010, KazakhstanPetrov, MaximUmirzakov, GulomjonNational University of Uzbekistan, Tashkent, 100174, UzbekistanUsubaliev, RyskulCentral-Asian Institute for Applied Geosciences, Bishkek, 720027, Kyrgyzstan

2023en

ABI

Аннотация

Abstract. Isotopic composition of precipitation in the mountains of four Central Asian countries (Kazakhstan, Kyrgyzstan, Tajikistan and Uzbekistan) was measured using 908 event-based precipitation samples collected at eight sites in 2019–2021, and 7 monthly samples from Dushanbe (Tajikistan) thereby filling a gap in stable isotope data for the region. Regional and seasonal patterns of δ18O, δD and D-excess were investigated. Local Meteoric Water Lines (LMWL) derived using seven regression methods using both non-weighted and weighted precipitation. It is recommended that the non-weighted Ordinary Least Squares Regression (OLSR) and Reduced Major Axis Regression (RMA) methods can be applied across the region except in summer, when the Precipitation-Weighted Least Squares Regression (PWLSR) method is recommended. An atmospheric back trajectory analysis and a mixing model were applied in combination for the first time, using the δ18O, δD and D-excess data, to identify the atmospheric moisture source regions and quantify the relative importance. The main distant sources were the Black and Caspian Seas region, Iran – eastern Mediterranean, and northern Kazakhstan – Siberia. The recycled moisture from the irrigated lower reaches of the Amu Darya and Syr Darya rivers, and from the study catchments, accounted for 29–71 % of the atmospheric moisture reaching the observation points. In spring, summer and winter, in the Chon-Kyzyl-Suu catchment, up to 85 % of the precipitation was estimated to be derived from local re-evaporation, most likely from Lake Issyk Kul. These findings highlight the importance of moisture from terrestrial sources, especially irrigated land, in precipitation formation in Central Asia.

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Темы

Marine and environmental studies Soil and Environmental Studies Geophysics and Gravity Measurements

Идентификаторы

DOI: 10.5194/egusphere-2023-2030-rc1

Цитирования и источники

Цитирований: 0Использованных источников: 38

Показатели — AkademScholar