Calibrating system and calibrating method for gas exchange flux of land-atmosphere interface

Abstract

The invention relates to a calibrating system and a calibrating method for gas exchange flux of a land-atmosphere interface. The calibrating system comprises an exchange process simulating unit, a T-shaped balancing port, an exchange flux measuring unit and an environment variable measuring unit, wherein the exchange process simulating unit mixes standard gas in a standard gas cylinder with air ina storage tank to obtain mixed gas; the T-shaped balancing port balances the pressure difference between the mixed air and environmental atmosphere; land-atmosphere exchange happens through a pervious bed as a result of concentration difference between the mixed gas and the environmental atmosphere; characteristic changes of the pervious bed simulate land-atmosphere exchange processes of different types of soil; the exchange flux measuring unit is connected to the exchange process simulating unit to detect the concentrations of the mixed gas of the storage tank and the environmental atmosphere; and the environmental variable measuring unit is connected to the exchange process simulating unit to determine the standard value Fs of the land-atmosphere exchange flux according to data of a sensor module and concentrations of the mixed gas and the environmental atmosphere. Therefore, errors of the measured value Fm of land-atmosphere exchange flux are calibrated through a closed box method,that is, the absolute error ea is equal to Fm-Fs.

Description

technical field [0001] The invention relates to the technical field of observation of material exchange flux at the terrestrial ecosystem-atmosphere interface, in particular to a calibration system and method for gas exchange flux at the terrestrial-atmosphere interface. Background technique [0002] The increase in the concentration of greenhouse gases in the atmosphere leads to global warming has become the focus of climate change research. The gas exchange process between the land and the atmosphere significantly affects the concentration of greenhouse gases in the atmosphere. The gas mass per unit area of ​​the interface with the atmosphere) and its temporal and spatial variation characteristics are the prerequisites for scientifically assessing the intensity of greenhouse gas sources and sinks in terrestrial ecosystems and their contribution to climate change. [0003] The closed box method (divided into static box method and dynamic box method) is the most commonly use...

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to provide a calibration system and method of gas exchange flux at the land-atmosphere interface, to solve at least one of the above-mentioned technical problems

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