Generator capable of generating water vapor with constant hydrogen and oxygen stable isotope ratio and application

Abstract

The invention provides a generator capable of generating water vapor with different concentrations and a constant hydrogen and oxygen stable isotope ratio according to the requirement and a method thereof. The method can be used for demarcating an atmosphere water vapor stable isotope instrument, realizing performance assessment or demarcation of an instrument in succession or at regular intervals, or directly be used for the generator generating the water vapor with different concentrations. The generator is beneficial to installation and disassembly in the wild. The generator comprises six parts: (1) a trace water-dripping device; (2) an evaporation device; (3) a constant temperature heating device; (4) a dry air injecting device; (5) a water vapor outlet; and (6) an air mixing device.

Description

Technical field: [0001] The invention relates to atmospheric science, hydrology and stable isotope ecology, in particular to the calibration technology of atmospheric water vapor stable isotope instruments. Background technique: [0002] Due to the existence of isotope effect, H 2 18 O, HD 16 O and H 2 16 O has become the best tracer of different forms of water movement among soil, vegetation, atmosphere and ocean, and has become an important research tool involving various disciplines such as atmosphere, hydrology and ecology. Since the relative abundance of light isotopes in nature is very high, while the relative abundance of heavy isotopes is very low, the isotope ratio is usually expressed by δ value, [0003] δ=(R / R Std -1)×1000‰ (1) [0004] where R is 18 O / 16 O or D / H molar ratio, R Std is a standard substance 18 O / 16 O or D / H molar ratio, usually adopts Vienna (Vienna) standard mean sea water (V-SMOW) at present, wherein 18 O / 16 O is 0.0020052 an...

AI Technical Summary

Problems solved by technology

There are three main reasons: first, the atmospheric water vapor cold trap / mass spectrometer technology is time-consuming and laborious; second, it is susceptible to errors caused by the condensation efficiency of the cold trap; third, and most importantly, the collected water vapor The results of samples can only be obtained after mass spectrometer analysis, which is very unrealistic for in-situ continuous observation experiments in the field

This will make the performance of the in-situ continuous observation system unable to be guaranteed technically

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