阿尔泰山降水氢氧稳定同位素特征及水汽来源分析

doi:10.12118/j.issn.1000-6060.2021.480

摘要/Abstract

摘要：

阿尔泰山横亘于亚欧大陆中部,是中纬度西风带气候研究的重点区域之一。利用阿尔泰山地区4个站点的监测数据,研究了该区域降水氢氧稳定同位素的年内变化特征及大气降水线方程,分析了降水同位素的温度效应,并利用后向轨迹探讨了水汽来源。结果表明：（1）阿尔泰山各站点降水同位素比率在季节上表现为夏高冬低,且南侧站点的季节差异比北侧大,除Novosibirsk外大多数站点的降水氘盈余值为夏低冬高。（2）除Novosibirsk外,研究区大多数站点大气降水线方程的斜率和截距都低于全球平均值。（3）各站点降水同位素存在明显的温度效应,体现在季节变化和空间分布上。（4）后向轨迹表明,研究区受到西风水汽、极地水汽和近源水汽路径的影响,且偏北站点可能受极地水汽路径的影响更大。上述认识有助于明确阿尔泰山不同区域降水同位素时空变化反映的水文气候信息,并为该区域大气水循环及气候变化研究提供参考。

关键词: 降水同位素, 后向轨迹, 水汽来源, 阿尔泰山

Abstract:

The Altay Mountains located in the middle of the Eurasian continent are one of the key areas of climate research in the mid-latitude westerlies. On the basis of the data collected from the four stations across the Altay Mountains, the intra-annual variations of stable hydrogen and oxygen isotopes in precipitation and the meteoric water lines were investigated. The temperature effect on precipitation isotopes was examined, and the water vapor sources were analyzed using backward trajectory. The following results were obtained. (1) The isotope ratios in precipitation are higher in summer and lower in winter, and the seasonal difference in the southern side is larger than that in the northern side. The deuterium excess value in precipitation is lower in summer and higher in winter at most stations, except for Novosibirsk. (2) The slope and intercept of meteoric water lines are lower than the global average at most stations, except for Novosibirsk. (3) The isotope ratios in precipitation have an obvious temperature effect, which can be seen from seasonal variations and spatial patterns. (4) The backward trajectory indicates a joint influence of the westerlies, the polar air mass, and the locally evaporated water vapor, and the northern stations may be more influenced by the polar path than other stations. These findings are useful for understanding the hydrological and climate information about stable precipitation isotopes across different parts of the Altay Mountains and provide a reference for investigating regional atmospheric water cycle and climate change.

Key words: precipitation isotope, backward trajectory, water vapor source, Altay Mountains

段丽洪,王圣杰,张明军,王力福. 阿尔泰山降水氢氧稳定同位素特征及水汽来源分析[J]. 干旱区地理, 2022, 45(4): 1042-1049.

DUAN Lihong,WANG Shengjie,ZHANG Mingjun,WANG Lifu. Stable hydrogen and oxygen isotopes in precipitation and water vapor source in the Altay Mountains[J]. Arid Land Geography, 2022, 45(4): 1042-1049.

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站点	纬度/°N	经度/°E	海拔/m	气温/℃	降水量/mm
Takhin Tal^[24]	45.5	93.7	1760	-1.7	138.8
阿勒泰^[22]	47.7	88.1	735	5.8	168.1
Zonalnoe^[25]	52.3	85.1	270	3.3	524.5
Novosibirsk^[26]	55.1	82.9	162	1.8	525.5

站点	模拟产品	R²		MAE/‰		MBE/‰		RMSE/‰
站点	模拟产品	δ¹⁸O	d	δ¹⁸O	d	δ¹⁸O	d	δ¹⁸O	d
Takhin Tal	OIPC	0.86	0.23	3.58	31.19	-1.66	-29.74	3.59	30.69
Takhin Tal	RCWIP	0.79	0.52	3.44	19.58	-2.94	-19.58	4.81	19.98
阿勒泰	OIPC	0.89	0.29	1.65	4.21	-0.41	-0.24	2.16	4.77
阿勒泰	RCWIP	0.93	0.06	1.54	4.98	1.13	3.59	2.04	6.49
Zonalnoe	OIPC	0.71	0.45	2.17	8.61	0.96	-8.61	3.02	9.08
Zonalnoe	RCWIP	0.77	0.41	2.28	3.04	-0.54	-1.62	2.65	3.32
Novosibirsk	OIPC	0.81	0.02	2.05	6.20	0.78	-1.73	2.39	8.44
Novosibirsk	RCWIP	0.85	0.08	2.39	11.36	-1.45	7.13	3.08	12.53