降雨同位素研究和当地流星水线的定义:中非共和国班吉市雨量站案例

Eric Foto, O. Allahdin, Olga Biteman, N. Poumaye
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摘要

通过本文讨论的雨水同位素组成研究,可以对班吉地区两个站点 11 年来的降雨量进行同位素定性。它将突出同位素、气候参数和时间变化之间的关系,然后确定当地的流星线,这构成了该地区的参考点。经过 11 年不间断跟踪得出的结果显示了两种主要的物理效应:降雨效应对同位素组成的影响更大;同位素含量与降雨量成反比变化。例如,在 8 月和 9 月的强降雨中,δ¹⁸O 和 δ²H 的含量急剧下降。δ¹⁸O和δ²H的含量分别为-4.96‰和-28.3‰。7 月和 10 月的降水量也有类似的影响,但较弱。我们还注意到,班吉大学站的同位素含量低于位于下乌班吉山海拔 386 米处的班吉索德卡站,这类似于假海拔效应。根据水中稳定同位素含量随气象参数(温度、降雨量、海拔高度)的变化情况,我们可 以通过以下两个测量站确定班吉市的当地气象线:δ2H=7.6×δ18O+10.4(R2=0.9909)班吉大学,δ2H=8.4×δ18O+12.5(R2=0.9909)班吉-索德卡,δ2H=7.9×δ18O+11.3(R2=0.9939)班吉当地气象水线。
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Isotopic study of rainfall and definition of local meteoric water lines: Case of the rainfall stations of the city of Bangui in Central African Republic
The study of the isotopic composition of rainwater discussed in this article allows isotopic characterization of rainfall recorded in the Bangui region over 11 years at two stations. It will highlight the relationships between isotopes, climatic parameters, and temporal variation before defining the local meteoric line, which constitutes the reference point for the region. The results obtained after a follow-up of eleven years without interruption showed two major physical effects, the effect of the rainfall influences more strongly the composition in isotopes, the contents in isotopes vary inversely with the precipitation. For example, heavy rainfall in August and September saw a strong depletion of δ¹⁸O and δ²H contents. These values reach up to -4.96‰ for δ¹⁸O and -28.3‰ for δ²H. Similar, although weaker, effects are observed for July and October precipitation. We also note that the isotope contents at the Bangui University station are lower than those measured at the Bangui Sodeca station located at 386 m altitude on the Lower Ubangi Hill, which is similar to a pseudo-altitude effect. The evolution of stable isotope content in water as a function of meteorological parameters (temperature, rainfall, altitude) has allowed us to determine a local meteorological line for the city of Bangui from two measuring stations defined as follows: δ2H = 7.6 × δ18O + 10.4 (R2 = 0.9909) Université de Bangui, δ2H = 8.4 × δ18O + 12.5 (R2 = 0.9909) Bangui-Sodeca and δ2H = 7.9 × δ18O + 11.3 (R2 = 0.9939) Bangui local meteoric water lines.
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