银川平原降水氢氧稳定同位素时间尺度效应及水汽来源

doi:10.12118/j.issn.1000–6060.2021.122

摘要/Abstract

摘要：

为揭示银川平原降水稳定同位素的时间尺度效应及水汽来源,采用后向轨迹模型聚类分析法、潜在源贡献分析法（PSCF）和浓度权重轨迹分析法（CWT）解析水汽来源及潜在蒸发源区。结果表明：（1）银川平原降水氢氧稳定同位素组成存在明显的季节性变化,冬半年降水氢氧稳定同位素组成（-38.6‰±51.6‰和-4.5‰±5.2‰）明显偏正于夏半年（-40.9‰±17.7‰和-5.7‰±3.0‰）;不同时段下,局地大气降水线（LMWL）具有显著差异,夏半年LMWL的斜率、截距（5.43、-9.71）低于冬半年的斜率、截距（9.10、5.08）和银川平原全年LMWL的斜率、截距（6.79、-2.79）。（2）在全年、夏半年和冬半年,降水中δ¹⁸O的气温效应显著,气温效应分别为（0.473±0.210）‰·℃^-1、（0.258±0.037）‰·℃^-1和（0.211±0.031）‰·℃^-1,降水量效应不显著。（3）在夏半年和冬半年,研究区降水的水汽来源主要为西风水汽,同时受局地蒸发水汽的影响。夏半年,水汽蒸发源区主要分布在研究区周边地区及西部、西南部和南部;冬半年主要分布在研究区周边地区和西部。研究结果可为干旱地区利用稳定同位素技术鉴别水汽来源方法的选择提供理论依据。

关键词: 大气降水, 稳定同位素效应, 水汽来源, 潜在蒸发源区, 不同时间尺度, 银川平原

Abstract:

The environmental effects of stable isotope and water vapor precipitation sources in the Yinchuan Plain, Ningxia Hui Autonomous Region, China, were studied using backward trajectory clustering analysis, the potential source contribution function, and the concentration-weighted trajectory analysis method to resolve vapor sources and potential evaporation source areas. Our results showed that (1) there were obvious seasonal variations in the hydrogen-oxygen stable isotope composition of precipitation in the Yinchuan Plain, and the hydrogen-oxygen stable isotope composition of precipitation in the winter half-year (-38.6‰±51.6‰ and -4.5‰±5.2‰) was significantly more positive than that in the summer half-year (-40.9‰±17.7‰ and -5.7‰±3.0‰); The local meteoric water line was greatly improved. The slope and intercept of the LMWL in the summer half-year (5.43, -9.71) were lower than that in the winter half-year (9.10, 5.08), and that of the whole year (6.79, -2.79). (2) The temperature effect was significant at three time periods: (0.473±0.210) ‰·°C^-1, (0.258±0.037)‰·°C^-1 and (0.211±0.031)‰·C^-1 under the entire year, summer and winter half-year, respectively, the precipitation effect was not significant. (3) During the summer and winter half-years, the vapor sources of precipitation in the study area were primarily westerly water vapor, but were also influenced by local evaporative vapor. In the summer half-year, the evaporative vapor source areas were mainly distributed in the area surrounding the study area and the western, southwestern, and southern parts of the study area; During the winter half-year, they were mostly found in the area surrounding the study area and to the west. The study’s findings may provide a theoretical foundation for selecting methods for identifying water vapor sources in arid regions using stable isotope techniques.

Key words: atmospheric precipitation, stable isotope effect, water vapor source, potential evaporation source, different time scales, Yinchuan Plain

高阳,韩磊,韩永贵,黄晓宇,彭苓,柳利利. 银川平原降水氢氧稳定同位素时间尺度效应及水汽来源[J]. 干旱区地理, 2022, 45(1): 91-102.

GAO Yang,HAN Lei,HAN Yonggui,HUANG Xiaoyu,PENG Ling,LIU Lili. Time scale effect of hydrogen and oxygen stable isotopes in precipitation and source of water vapor in Yinchuan Plain[J]. Arid Land Geography, 2022, 45(1): 91-102.

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采样点	δD年均值/‰	δ¹⁸O年均值/‰	氘盈余（d-excess）年均值/‰	平均气温/℃	降水量/mm	平均相对湿度/%	降水样品/个
银川	-29.4	-3.0	-5.7	18.93	101.5	63.85	17
灵武	-33.8	-4.9	5.0	20.84	113.7	70.40	19

季节	银川			灵武			银川平原
季节	斜率	截距	R²	斜率	截距	R²	斜率	截距	R²
夏半年	5.38	-8.45	0.87	5.52	-10.41	0.71	5.43	-9.71	0.85
冬半年	9.55	0.60	0.99	8.26	7.29	0.94	9.10	5.08	0.96
全年	6.72	-3.60	0.84	7.33	0.58	0.88	6.79	-2.79	0.84

季节	T	T(P_a)	P_a	P_a(T)
夏半年	0.310（0.045）	0.327（0.037）	0.158（0.318）	0.191（0.231）
冬半年	0.848（0.069）	0.790（0.210）	0.588（0.297）	0.351（0.649）
全年	0.320（0.028）	0.319（0.031）	0.151（0.311）	0.149（0.323）

季节	常数项	气温效应	气温效应偏决定系数	RMSE	R²	F
夏半年	-11.402	0.258±0.037^*	0.324	3.905	0.085	2.899
冬半年	-10.533±0.075	0.473±0.210	0.740	4.056	0.508	3.067
全年	-9.990	0.211±0.031^*	0.315	4.052	0.082	3.061