Linkage between precipitation isotopes and water vapor sources in the monsoon margin: Evidence from arid areas of Northwest China

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Fenli Chen, Qiuyan Zhang, Shengjie Wang, Jufan Chen, Minyan Gao, Mohd Aadil Bhat
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引用次数: 0

Abstract

The isotope composition in precipitation has been widely considered as a tracer of monsoon activity. Compared with the coastal region, the monsoon margin usually has limited precipitation with large fluctuation and is usually sensitive to climate change. The water resource management in the monsoon margin should be better planned by understanding the composition of precipitation isotope and its influencing factors. In this study, the precipitation samples were collected at five sampling sites (Baiyin City, Kongtong District, Maqu County, Wudu District, and Yinchuan City) of the monsoon margin in the northwest of China in 2022 to analyze the characteristics of stable hydrogen (δD) and oxygen (δ18O) isotopes. We analyzed the impact of meteorological factors (temperature, precipitation, and relative humidity) on the composition of precipitation isotope at daily level by regression analysis, utilized the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT)-based backward trajectory model to simulate the air mass trajectory of precipitation events, and adopted the potential source contribution function (PSCF) and concentration weighted trajectory (CWT) to analyze the water vapor sources. The results showed that compared with the global meteoric water line (GMWL), the slope of the local meteoric water line (LMWL; δD=7.34δ18O−1.16) was lower, indicating the existence of strong regional evaporation in the study area. Temperature significantly contributed to δ18O value, while relative humidity had a significant negative effect on δ18O value. Through the backward trajectory analysis, we found eight primary locations that were responsible for the water vapor sources of precipitation in the study area, of which moisture from the Indian Ocean to South China Sea (ITSC) and the western continental (CW) had the greatest influence on precipitation in the study area. The hydrogen and oxygen isotopes in precipitation are significantly influenced by the sources and transportation paths of air mass. In addition, the results of PSCF and CWT analysis showed that the water vapor source areas were primarily distributed in the south and northwest direction of the study area.

季风边缘降水同位素与水汽源之间的联系:来自中国西北干旱地区的证据
降水中的同位素组成被广泛认为是季风活动的示踪剂。与沿海地区相比,季风边缘地区的降水量通常有限且波动较大,对气候变化通常比较敏感。应通过了解降水同位素的组成及其影响因素,更好地规划季风边缘地区的水资源管理。本研究于 2022 年在中国西北季风边缘地区的五个采样点(白银市、崆峒区、玛曲县、武都区和银川市)采集了降水样品,分析了稳定氢(δD)和氧(δ18O)同位素的特征。采用回归分析方法分析了气象要素(温度、降水和相对湿度)对日降水同位素组成的影响,利用基于混合单粒子拉格朗日综合轨迹(HYSPLIT)的后向轨迹模式模拟了降水事件的气团轨迹,并采用潜在源贡献函数(PSCF)和浓度加权轨迹(CWT)分析了水汽源。结果表明,与全球流水线(GMWL)相比,当地流水线(LMWL;δD=7.34δ18O-1.16)的斜率较低,表明研究区域存在较强的区域蒸发。温度对δ18O值有明显的影响,而相对湿度对δ18O值有明显的负面影响。通过后向轨迹分析,我们发现研究区降水的水汽来源主要有八个地点,其中印度洋至南海(ITSC)和西部大陆(CW)的水汽对研究区降水的影响最大。降水中的氢、氧同位素受气团来源和输送路径的影响较大。此外,PSCF 和 CWT 分析结果表明,水汽源区主要分布在研究区的南部和西北部方向。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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