Device for continuously and automatically measuring interface CO2 exchange flux

Abstract

The invention discloses a device for continuously and automatically measuring interface CO2 exchange flux. The device comprises a CO2 analyzer, a data recorder, a flux box, an air extracting pump, a water drop sensing module, an air filter head and an automatic air path control device, wherein the water drop sensing module and the air filter head are used for performing waterproof protection on the CO2 analyzer; the automatic air path control device is used for controlling an air path to perform internal circulation or air exchange; the air extracting pump, the automatic air path control device, the CO2 analyzer and the air filter head are sequentially connected in series by air pipes; an air outlet end of the air extracting pump is connected to a gas inlet port of the flux box by an air pipe; and a gas outlet port of the flux box is connected to an air inlet end of the air filter head by an air pipe. The device realizes flux box gas and air exchange, excessive CO2 absorption and CO2 flux measurement by utilizing the automatic air path control device; the operation is fully automatic under the action of the air extracting pump and under control of solenoid valves; high-frequency interface CO2 flux data can be obtained; and the device has the characteristics of low cost and convenience in operation.

Description

technical field [0001] The invention relates to a gas measuring device, in particular to a continuous automatic measuring device for interfacial carbon dioxide exchange flux, belonging to the technical field of greenhouse gas exchange flux testing devices. Background technique [0002] With CO 2 With the continuous development of infrared observation technology, its technology is becoming more and more mature, and its price is getting lower and lower. It has become an important means of greenhouse gas research in the environmental field. Compared with the traditional sampling research, the new method has the characteristics of low cost, high efficiency and small systematic error. At present, a large number of methods have been used to measure interface (water surface-atmosphere or soil-atmosphere) CO2 using this technology. 2 The study of exchange flux provides a large amount of scientific data for global climate change and greenhouse gas emission reduction. But there is ...

AI Technical Summary

Problems solved by technology

However, the corresponding flux boxes often need to be opened or closed by external force (motor or cylinder drive), which consumes a lot of energy

At the same time, due to the relatively complicated technology, the volume of this kind of flux box is fixed, and it is difficult to modify it according to the actual situation in the field. In addition, this kind of special flux box is expensive and has high maintenance costs, so it is not conducive to large-scale use in the field;

[0005] (3) There are also existing technologies for measuring CO in the atmosphere, water or soil 2 Concentration gradient, calculated by diffusion model for water surface or soil CO 2 Exchange flux, the disadvantage of this method is that the observed system must have certain spatial consistency and meteorological conditions, and often requires the data obtained by the flux box method to correct;

[0006] (4) CO 2 The data quality of infrared sensors is easily affected by water vapor, and the CO at the water surface-atmosphere interface 2 In the exchange study, water can easily enter the infrared sensor and damage the sensor

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