Processing method and device for measured data of stable oxygen and hydrogen isotope ratio in water vapor

Abstract

The invention discloses a processing method which is used for measured data of the stable oxygen and hydrogen isotope ratio in water vapor and is beneficial for eliminating errors generated when water vapor isotopes are determined with an isotope spectrometer. The method comprises the steps that the stable oxygen and hydrogen isotope ratios of specific water under multiple preset humidity values are measured with the spectrometer, and a first ratio sequence is obtained; the stable oxygen and hydrogen isotope ratio of the specific water under a specific humidity value is measured with the spectrometer; high-order polynomial fitting is conducted to obtain a humidity normalization formula for the spectrometer according to the first ratio sequence, the stable oxygen and hydrogen isotope ratios under the humidity values and the stable oxygen and hydrogen isotope ratios under the specific humidity value; a current humidity value and the stable oxygen and hydrogen isotope ratio under the current humidity value of measured water vapor are measured with the spectrometer; the stable oxygen and hydrogen isotope ratio of the measured water vapor under a humidity value normalized to the specific humidity value is obtained according to the normalization formula and the current humidity value and the stable oxygen and hydrogen isotope ratio under the current humidity value of the measured water vapor.

Description

technical field [0001] The invention relates to the technical field of isotope determination, in particular to a method and device for processing measurement data of hydrogen and oxygen stable isotope ratios in water vapor. Background technique [0002] Different forms of water molecules in nature (H 2 16 O, HDO, H 2 18 O) There are differences in mass and combination form, leading to differences in isotope fractionation in phase transitions under different meteorological conditions. For example, during the evaporation of liquid water into a gaseous state, water molecules containing heavier isotope atoms (such as those containing 18 O, D) It is more difficult to evaporate than ordinary water molecules. In order to define how many heavy isotopes are contained in different water bodies, the seawater near Vienna is used as the basic standard to define the isotope ratio, which is the ratio of the sample value to the value of Vienna seawater, where the sample value is [HDO] / ...

AI Technical Summary

Problems solved by technology

However, the measurement results of the isotope spectrometer have large errors

[0005] In order to promote the research on the hydrogen and oxygen stable isotope ratio of water, the International Atomic Energy Agency (IAEA) proposed the International Water Isotope Measurement and Comparison Program (http: / / www-naweb.iaea.org / napc / ih / index.html), but the The plan is only carried out for isotope mass spectrometry laboratories

The monitoring technology of the isotope spectrometer still has no unified standard, nor has it generally reached an acceptable level, so it cannot join the plan for the time being

[0006] In order to promote the progress of isotope spectrometer technology, the LGGE laboratory of the French National Academy of Sciences convened scientists from all over the world to hold the "First Seminar on Atmospheric Water Vapor Stable Isotope Observation, Simulation and Measurement Technology" on October 15-20, 2013, and planned to release a white paper. Unified technical standards, but no substantial progress has been made (http: / / caylor.princeton.edu / 2014 / 01 / first-international-workshop-on-advances-in-o bservations-models-and-measurements-techniques-of-atmospheric -water-vapor-isot opes / )

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