Isotopic composition of rainfall in Baja California Sur, México

Luis González- Hita, M. A. Mejía-González, Blanca Carteño- Martinez, J. C. Aparicio-González, Dustin Mañón- Flores
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引用次数: 3

Abstract

The study of the connection between precipitation and groundwater recharge/discharge using stable isotopes has been limited in México. One of the main limitations is the lack of local stable isotopes monitoring for rainfall. Indeed, only two stations of the Global Network of Isotopes in Precipitation operated in Mexico from 1962 to 1988. This study reports temporal characterization of stable isotopes in meteoric waters in the northwest of Mexico that has been lacking up to the present. Stable isotope analyses of the rain collected in the city of Loreto, state of Baja California Sur, from 2018 to 2021 were conducted using laser water isotope analyzers Picarro L2110-i and Los Gatos Research LWIA-45EP. A least squares regression of the isotope data was used to obtain the local meteoric water line: δ2H =8 δ18O + 9.4 (r2=0.98). The average value of winter rain is δ18O=-2.46 ‰ and δ2H=-10.2 ‰, monsoon rain δ18O=-4.93 ‰ y δ2H=-30.3 ‰, atmospheric river rain δ18O=-5.35 ‰ and δ2H=-33.3 ‰ and tropical cyclones rain δ18O= -10.7 ‰ y δ2H=-76.3. Isotope data indicated that tropical cyclones are the main source of recharge for the coastal aquifers of Baja California, Sur.
下加利福尼亚南部降雨的同位素组成
利用稳定同位素研究降水与地下水补给/排放之间关系的工作在莫桑比克受到限制。主要的限制之一是缺乏对降雨的本地稳定同位素监测。事实上,从1962年到1988年,墨西哥只有两个全球降水同位素网络站在运行。本研究报告了墨西哥西北部大气水体中稳定同位素的时间特征,这一特征迄今为止一直缺乏。使用激光水同位素分析仪Picarro L2110-i和Los Gatos Research LWIA-45EP对2018年至2021年在下加利福尼亚州南部洛雷托市收集的雨水进行了稳定同位素分析。对同位素资料进行最小二乘回归,得到当地大气水线δ2H =8 δ18O + 9.4 (r2=0.98)。冬季降水δ18O=-2.46‰,δ2H=-10.2‰,季风降水δ18O=-4.93‰,δ2H=-30.3‰,大气河雨δ18O=-5.35‰,δ2H=-33.3‰,热带气旋降水δ18O= -10.7‰,y δ2H=-76.3。同位素数据表明,热带气旋是南下加利福尼亚沿海含水层补给的主要来源。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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