塔什库尔干河流域河谷大气降水同位素特征与水汽输送路径

doi:10.13866/j.azr.2024.03.05

Abstract

Abstract:

By using stable isotope data of atmospheric precipitation from September 2018 to May 2020 in the Taxkorgan River Basin Valley and meteorological data such as temperature, precipitation, and relative humidity from representative weather stations within the valley, this study analyzed the variation in δ¹⁸O, δ²H, and deuterium excess (d-excess) of precipitation. The influencing factors were explored, and the water vapor transport pathways of atmospheric precipitation in the valley were traced and analyzed using the hybrid single- particle Lagrangian integrated trajectory model (HYSPLIT). Results show that the δ²H and δ¹⁸O values of precipitation generally present a seasonal pattern of enrichment in summer and depletion in winter, showing a significant temperature effect (1.33‰·℃^-1), but no significant precipitation effect was observed. The local meteoric water line is δ²H=7.63δ¹⁸O-3.55, which shows distinct arid climate characteristics. The HYSPLIT simulation results indicate that the water vapor of precipitation in the study basin is mainly influenced by the westerly circulation and local water vapor recycling, with local water vapor evaporation accounting for 54.09% in the summer half-year and the long-distance transport of the western route accounting for 45.53% in the winter half-year. Water vapor from the Indian Ocean in August can bypass the Tibetan Plateau and reach the study area. These findings can provide a reference basis for water resource management and climate response in the Taxkorgan River Basin Valley.

Key words: hydrogen and oxygen stable isotopes, atmospheric precipitation, water vapor sources, Taxkorgan River Basin Valley

LI Hanwei, YAO Junqiang, RONG Tao, ZHANG Tianyang, GAO Yajie. Characteristics of atmospheric precipitation isotope and path analysis of water vapor transport in the Taxkorgan River Basin Valley[J].Arid Zone Research, 2024, 41(3): 399-410.

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时间（样品数/个）	同位素类型	最小值/‰	最大值/‰	加权均值/‰	算数均值/‰	标准偏差
夏半年（34）	δ²H	-231.45	-0.19	-80.01	-70.93	66.78
	δ¹⁸O	-28.80	0.80	-10.36	-8.87	8.97
	d-excess	-26.98	18.03	2.90	0.04	10.85
冬半年（14）	δ²H	-255.71	-8.28	-155.57	-144.64	80.19
	δ¹⁸O	-33.44	-3.23	-20.34	-18.99	10.05
	d-excess	-20.30	26.50	7.11	7.24	13.46
全年（48）	δ²H	-255.71	-0.19	-109.07	-92.43	78.47
	δ¹⁸O	-33.44	0.80	-14.20	-11.82	10.37
	d-excess	-26.98	26.50	4.52	2.14	12.12

参数	气温/℃	相对湿度/%	降水量/mm	δ²H/‰	δ¹⁸O/‰
相对湿度/%	-0.70（0.00）
降水量/mm	-0.12（0.00）	0.18（0.00）
δ²H/‰	0.79 （0.00）	-0.37（0.00）	-0.21（0.00）
δ¹⁸O/‰	0.79 （0.00）	-0.38（0.00）	-0.23（0.00）	0.24（0.00）
d-excess/‰	-0.27 （0.22）	0.16（0.00）	0.20（0.89）	-0.31（0.00）	-0.44（0.00）

Characteristics of atmospheric precipitation isotope and path analysis of water vapor transport in the Taxkorgan River Basin Valley

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