Measuring box and method for measuring exhausting flux of greenhouse gas on water surface

Abstract

The invention discloses a measuring box and method for measuring the exhausting flux of greenhouse gas on a water surface. The measuring box comprises a box body, a rectangular foam floating device, gas suction conduits, a three-way valve, a gas suction needle cylinder and a fixing rope, wherein the box body is hollow and semi-cylindrical; the bottom surface of the box body is rectangular and opened, two lateral surfaces of the box body are semi-circular and the top surface of the box body is arc-shaped; the rectangular foam floating device is arranged all around the exterior of the box body which is suspended on the rectangular foam floating device; gas sampling holes are formed in the top surface of the box body and are separately formed in the middle parts of the two lateral surfaces of the box body and the center of the arc-shaped top surface; one end of each gas suction conduit is respectively connected with the gas sampling holes, the other end of each gas suction conduit is respectively connected with one end of the three-way valve and another end of the three-way valve is respectively connected with the gas suction needle cylinder. The measuring box disclosed by the invention is reasonable in structure, small in size, portable, high in stability and capable of shortening sampling time and ensuring sampling accuracy.

Description

technical field [0001] The invention belongs to the field of environmental monitoring, and in particular relates to a device measurement method for measuring the release flux of greenhouse gas at the water-air interface of rivers, lakes and reservoirs. [0002] Background technique [0003] A series of issues such as the increasing concentration of greenhouse gases in the atmosphere and the resulting global warming have drawn widespread attention to the "source-sink" effect of greenhouse gases. Lakes, reservoirs, rivers and other water bodies, as an important aspect of the impact of human activities on the concentration of atmospheric greenhouse gases, have attracted more and more attention. The key to related research is to measure and calculate the greenhouse gas flux on the water-air interface of lakes, reservoirs, rivers and other water bodies. [0004] The closest similar technical application of the present invention is the current flux box for the measurement of gre...

AI Technical Summary

Problems solved by technology

For such floating tank design, there are the application defects of the following aspects so that the measurement accuracy is not high:

[0005] 1. There is a large volume of the box, a large ratio of the volume to the bottom surface, the slow change of the greenhouse gas concentration in the box, the long time required for mixing, the possibility of uneven mixing, and the disadvantage of a long sampling interval;

[0006] 2. Due to the large size and high height of the box, the balance and stability of the box on the water surface of the flowing water body is poor, and it is easily affected by wind force;

[0007] 3. The airflow generated during the continuous operation of the fan will to a certain extent interfere with the water surface covered by the floating tank, which may greatly affect the emission of greenhouse gases at the water-air interface;

[0008] 4. Most of the current flux measurement boxes need to drag the box to the shore or the side of the ship to take samples with a syringe when extracting gas, but most of the flux measurements need to take a series of samples (4-6 times within 1 hour), dragging back and forth Moving the box, making its accuracy greatly reduced

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