Device and method for measuring soil gaseous nitrous acid emission flux

Abstract

The invention belongs to the technical field of geographical environment, and particularly relates to a measuring device of the emission flux of soil nitrous acid (HONO). The measuring device comprises a main body frame, an upper cover arranged at the top of the main body frame, a lower cover arranged at the bottom of the main body frame, a gas inlet pipe, a gas outlet pipe, a diffusion pipe arranged in the main body frame and connected with the gas inlet pipe and a fan arranged in the main body frame, wherein the gas inlet pipe and the gas outlet pipe extend into the main body frame through the upper cover; the surfaces of the upper cover, the lower cover and the fan are coated with Teflon thin films; the side wall of the main body frame is a Teflon thin film; the gas inlet pipe, the gasoutlet pipe and the diffusion pipe are Teflon gas pipes; wall losses of active nitrogen gas such as HONO in the measuring process can be avoided, the measuring device can simulate the emission flux ofsoil HONO in a complete dry-wet alternation cycle, and compared with an existing measuring method, precision quantification of the emission flux of soil HONO can be realized.

Description

technical field [0001] The invention relates to the technical field of geographical environment, in particular to a device and method for measuring soil gaseous nitrous acid emission flux. Background technique [0002] Terrestrial ecosystems can emit greenhouse gases (CO 2 、CH 4 and N 2 O), active nitrogen gas (HONO, NO, NO 2 and NH 3 etc.) and volatile organic compounds (VOCs), etc., can also absorb these gases from the atmosphere. Gas exchange at the interface between the land and the atmosphere can significantly affect the composition of the Earth's atmosphere, human health, and the evolution of life. [0003] Reactive nitrogen gas, such as gaseous nitrous acid (HONO), has strong chemical activity, short atmospheric lifetime (0.5-2 hours), and strong adsorption. The emission flux of gaseous nitrous acid is affected by environmental conditions such as atmospheric concentration, temperature, humidity, and light. The traditional static box method to measure gas emissi...

AI Technical Summary

Problems solved by technology

The traditional static box method to measure gas emission flux is to measure the accumulation rate of gas in a closed box for a period of time. However, HONO will decompose on the material surface of the existing dynamic box system, resulting in a low measured concentration. Therefore, Traditional methods will greatly underestimate HONO gas emission fluxes

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