A dynamic water body greenhouse gas emission flux monitoring device and its application method

Abstract

This invention relates to the field of gas monitoring technology, and in particular to a dynamic water body greenhouse gas emission flux monitoring device and its application method, comprising a main shell. The dynamic water body greenhouse gas emission flux monitoring device and its application method of this invention employ a dynamic gas mixing and high-frequency sampling strategy, combined with real-time acquired temperature, pressure, and gas concentration data, and utilizes the ideal gas law and regression analysis calculation method to successfully capture the temporal variability characteristics of water body greenhouse gas emissions, significantly improving the accuracy and stability of monitoring results. Compared to traditional static floating box technology, this application can reflect the rapid fluctuations in greenhouse gas emissions in water bodies in real time within a short period, thus effectively solving the limitations of traditional static floating box technology in terms of time resolution and continuity, and improving the accuracy and reliability of monitoring results.

Description

Technical Field

[0001] This invention relates to the field of gas monitoring technology, and in particular to a dynamic water body greenhouse gas emission flux monitoring device and its application method. Background Technology

[0002] With the acceleration of industrialization, the concentrations of greenhouse gases in the atmosphere, such as carbon dioxide, methane, and nitrous oxide, are rapidly increasing. This phenomenon has become a core driving force behind a series of environmental problems, including global climate change, accelerated polar glacial melting, and rising sea levels, posing an increasingly severe challenge to global ecological balance and sustainable development. Although a wealth of research has been accumulated in identifying and quantifying greenhouse gas sources, the actual emissions from these sources remain highly uncertain due to limitations in existing monitoring technologies. Water bodies, as a significant carrier of greenhouse gas emissions, are crucial for a comprehensive understanding of the global greenhouse gas cycle. Therefore, there is an urgent need to develop more advanced monitoring technologies and equipment to overcome the shortcomings of existing technologies in terms of real-time performance and continuity, thereby more accurately estimating the emissions from various greenhouse gas sources. This has decisive scientific value and practical significance for improving the accuracy of global carbon emission accounting. Traditionally, methods for measuring greenhouse gas emission fluxes in water bodies mainly include static floating box technology, bubble capture method, eddy covariance method, thin boundary layer method, and flux-gradient method. However, while static floating box technology dominates in practical applications, it relies on the slow accumulation of gas concentration changes over time within an internal sampler. This makes it unable to capture rapid fluctuations in greenhouse gas emissions from water bodies in real time, resulting in significant deficiencies in temporal resolution and continuity, thus increasing the uncertainty in emission flux estimation. Particularly in the waste management industry, such as monitoring fugitive greenhouse gas emissions from wastewater treatment facilities, existing technologies struggle to achieve continuous, real-time, and high-precision measurements. Summary of the Invention

[0003] The technical problem that this invention aims to solve is that existing technologies are insufficient to achieve continuous, real-time, and high-precision measurements.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a dynamic water body greenhouse gas emission flux monitoring device, including a main shell, a plurality of flip-up assembly frames are movably mounted on the outer side of the main shell via lateral supports, a solar power panel is fixedly mounted on the side wall of the flip-up assembly frame, a rotary locking switch is installed on the side wall of the flip-up assembly frame, a buoyancy aid plate is installed on the bottom of the main shell and the outer side of the flip-up assembly frame, a bottom sampling groove with an opening at the lower end is opened inside the buoyancy aid plate, an internal sampler is fixedly mounted inside the main shell, and an internal adjustable drive unit is installed inside the internal sampler.

[0005] The upper surface of the main housing is fixedly fitted with an upwardly protruding limiting screw, and the upper end of the limiting screw is threaded with a top lifting handle.

[0006] A top cover plate that cooperates with a limiting screw is movably mounted on the outer side of the flip assembly frame, and an end limiting ring that is misaligned is fixed at the end of the top cover plate.

[0007] The built-in sampler includes an internal collection housing fixed to the bottom surface of the main housing, a temperature sensor, a pressure sensor, and a mixing fan fixed to the top surface of the internal collection housing, an embedded sampling air pump installed on the inner arc-shaped surface of the internal collection housing, and a sampling distributor fixed to the outer surface of the embedded sampling air pump. An external guide pipe is fixedly mounted on the outer surface of the sampling distributor.

[0008] A detachable air bag is installed at the air outlet on the outside of the external guide pipe.

[0009] The built-in adjustable drive unit includes a bottom adjustable support rod fixedly installed on the top surface inside the internal acquisition housing, a bottom guide shroud axially fixed to the bottom protruding end of the bottom adjustable support rod, an electrically controlled drive pump installed inside the bottom guide shroud, and an electrically controlled adjustable cover installed on the arc-shaped opening on the outside of the bottom guide shroud.

[0010] Both the bottom of the main shell and the corresponding position of the buoyancy-aiding bottom plate are provided with circular telescopic openings that cooperate with the bottom guide shroud.

[0011] The bottom of the flow guide shroud has a circular inlet, and a metal filter screen is fixed inside the circular inlet.

[0012] The electrically controlled regulating cover includes an annular regulating cover fitted onto the lateral opening of the bottom guide cover, a regulating motor fixed to the upper surface of the bottom guide cover, and a regulating gear axially fixed to the regulating motor.

[0013] Flip the flip assembly frame on the outer side of the main housing outward to a horizontal position, and then control the rotary locking switch to rotate so that the flip assembly frame is fixed to the outside of the main housing, forming a large-area support platform. The solar power panel on the support platform supplies power to all the electrical control mechanisms on the device. Then, the bottom of the main housing and the buoyancy plate on the flip assembly frame are used for floating support, so that the support platform is placed on the surface of the water body to be tested. This ensures that the built-in sampler structure is in close contact with the surface of the water body through the buoyancy plate, thereby forming an effective gas sampling area.

[0014] After deployment, continuous gas sampling and data recording are carried out. An electrically controlled pump draws air from the bottom gas sampling area into the internal collection housing. The air is then thoroughly mixed by a mixing fan. An embedded sampling air pump then guides the air through a sampling distributor and an external guide tube into a detachable gas bag for sampling. The sampling is performed at preset intervals to cover emission changes from short to long cycles. At each sampling moment, the gas concentration, temperature, and pressure data in the built-in sampler are recorded simultaneously to ensure comprehensive capture of the temporal variability of greenhouse gas emissions from water bodies.

[0015] By combining the ideal gas law with measured gas concentration, temperature and pressure data, a mathematical model is established. The measured data is then imported into the model for calculation using linear regression analysis. This allows for the accurate emission flux of greenhouse gases from water bodies.

[0016] The beneficial effects of this invention are:

[0017] (1) The dynamic water body greenhouse gas emission flux monitoring device and its application method of the present invention adopts dynamic gas mixing and high frequency sampling strategy, combined with real-time collected temperature, pressure and gas concentration data, and uses ideal gas state equation and regression analysis calculation method to successfully capture the time variability characteristics of water body greenhouse gas emission, which significantly improves the accuracy and stability of monitoring results.

[0018] (2) Compared with traditional static floating box technology, this application can reflect the rapid fluctuations of greenhouse gas emissions in water bodies in a short period of time in real time, thereby effectively solving the limitations of traditional static floating box technology in terms of time resolution and continuity, and improving the accuracy and reliability of monitoring results;

[0019] (3) This application is not only applicable to the study of greenhouse gas emissions from water bodies, but also extends to the measurement of greenhouse gas emission fluxes in terrestrial ecosystems, greatly enhancing its practicality and technological advantages;

[0020] (4) By providing continuous, real-time and high-precision measurement methods, this patent is not only conducive to in-depth analysis of the true situation of greenhouse gas emissions from water bodies and their impact on the global environment, but also provides key technical support and long-term practical value for promoting the accuracy of carbon emission accounting in the waste treatment industry and even the whole society.

[0021] (5) The device has an adjustable structure and can be quickly folded and stored when not in use, making it convenient to carry, transport and store;

[0022] (6) The entire device can be self-powered by a solar power system, and the larger platform can improve the stability of operation;

[0023] (7) This device has an automatic position adjustment drive unit, which integrates drive and air extraction power supply, greatly improving the functional integration. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0027] Figure 3 This is a schematic diagram of the internal structure of the built-in adjustable drive unit in this invention.

[0028] Figure 4 This is a flowchart of the present invention. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] Figure 1 , Figure 2 and Figure 3The device shown is a dynamic water body greenhouse gas emission flux monitoring device, including a main shell 1. Four flip-mounted assembly frames 2 are movably mounted on the outer side of the main shell 1 via lateral supports. Solar power panels 3 are fixedly mounted on the side walls of the flip-mounted assembly frames 2. Rotary locking switches 4 are installed on the side walls of the flip-mounted assembly frames 2. Buoyancy-aiding bottom plates 5 are installed on the bottom of the main shell 1 and the outer side of the flip-mounted assembly frames 2. Bottom sampling slots 6 with lower openings are opened inside the buoyancy-aiding bottom plates 5. An internal sampler is fixedly mounted inside the main shell 1. An internal adjustable drive unit is installed inside the internal sampler.

[0032] The upper surface of the main housing 1 is fixedly fitted with an upwardly protruding limiting screw 7, and the upper end of the limiting screw 7 is threaded with a top lifting handle 8.

[0033] A top cover plate 9 that cooperates with the limiting screw 7 is movably mounted on the outer side of the flip assembly frame 2, and an end limiting ring 10 with a misalignment is fixed at the end of the top cover plate 9.

[0034] The built-in sampler includes an internal collection housing 11 fixed on the bottom surface of the main housing 1, a temperature sensor 12, a pressure sensor 13 fixed on the top surface of the internal collection housing 11, a mixing fan 14, an embedded sampling air pump 15 installed on the inner arc-shaped surface of the internal collection housing 11, and a sampling distributor 16 fixed on the outer surface of the embedded sampling air pump 15. An external guide pipe 17 is fixedly mounted on the outer surface of the sampling distributor 16.

[0035] A detachable air bag 18 is installed at the air outlet on the outside of the external guide pipe 17.

[0036] Dynamic Measurement Method: Gas samples are periodically collected from the bottom sampling tank 6 using a built-in sampler and transferred to a detachable gas bag 18. The concentrations of greenhouse gases, such as carbon dioxide, methane, and nitrous oxide, are analyzed. Combined with continuous sampling data at varying frequencies (from minutes to a day), the method accurately reflects the time-varying characteristics of greenhouse gas emissions from water bodies and enables long-term, continuous emission flux monitoring. This method effectively overcomes the uncertainties caused by the low sampling frequency of static floating box technology, while significantly reducing labor and instrument testing costs. Optimized Configuration and Functional Expansion: The device is also equipped with a mixing fan 14 to accelerate the uniform mixing of gas within the internal collection housing 11, improving measurement accuracy. Additionally, temperature sensors 12 and pressure sensors 13 are added, enabling direct measurement and recording of temperature and pressure data of the gas inside the internal collection housing 11, facilitating accurate calculation of greenhouse gas emission fluxes from water bodies.

[0037] The built-in adjustable drive unit includes a bottom adjustable support rod 19 fixedly installed on the top surface inside the internal acquisition housing 11, a bottom guide shroud 20 axially fixed to the bottom protruding end of the bottom adjustable support rod 19, an electrically controlled drive pump 21 installed inside the bottom guide shroud 20, and an electrically controlled adjustable shroud 22 installed on the arc-shaped opening on the outside of the bottom guide shroud 20.

[0038] The bottom of the main shell 1 and the bottom plate 5 are provided with circular telescopic openings 23 that cooperate with the bottom guide shroud 20.

[0039] To facilitate bottom air extraction or liquid extraction, the bottom guide hood 20 has a circular inlet at the bottom, and a metal filter screen 24 is fixed inside the circular inlet.

[0040] When the bottom adjustable support rod 19 extends to control the bottom guide hood 20 to descend, the bottom guide hood 20 is inserted into the water body, and then the electric control drive pump 21 starts to draw water into the water body from the circular inlet and then discharges it laterally, thereby controlling the movement of the entire device on the water body.

[0041] When the bottom adjustable support rod 19 rises by retracting the bottom guide hood 20, the bottom guide hood 20 is raised to the upper opening of the circular telescopic port 23. Then the electrically controlled drive pump 21 starts, drawing air in from the circular inlet and blowing it into the internal collection housing 11 for gas collection. Then the mixing fan 14 accelerates the uniform mixing of the gas in the internal collection housing 11. Then the embedded sampling air pump 15 guides the air in the internal collection housing 11 into the sampling distributor 16, and then discharges it into the detachable air bag 18 through the external guide pipe 17 on the outer side of the sampling distributor 16.

[0042] In order to adjust the angle of the guide port, the electrically controlled adjustment cover 22 includes an annular adjustment cover 221 fitted on the lateral opening of the bottom guide cover 20, an adjustment motor 222 fixed on the upper surface of the bottom guide cover 20, and an adjustment gear 223 axially fixed on the adjustment motor 222.

[0043] The adjusting motor 222 engages with the annular adjusting cover 221 through the adjusting gear 223, thereby adjusting the position of the drain port on one side of the annular adjusting cover 221.

[0044] Flip the flip assembly frame 2 on the outer side of the main housing 1 outward to the horizontal, and then control the rotary locking switch 4 to rotate so that the flip assembly frame 2 is fixed on the outside of the main housing 1, forming a large-area support platform. The solar power panel 3 on the support platform supplies power to all the electrical control mechanisms on the device. Then, the bottom of the main housing 1 and the buoyancy plate 5 on the flip assembly frame 2 are used for floating support, so that the support platform is placed on the surface of the water body to be tested, ensuring that the built-in sampler structure is closely attached to the surface of the water body through the buoyancy plate 5, thereby forming an effective gas sampling area.

[0045] After deployment, continuous gas sampling and data recording are carried out. The sampling is performed at preset intervals to cover emission changes from short to long cycles. At each sampling moment, the gas concentration, temperature and pressure data in the built-in sampler are recorded simultaneously to ensure comprehensive capture of the temporal variability of greenhouse gas emissions from water bodies.

[0046] By combining the ideal gas law with measured gas concentration, temperature and pressure data, a mathematical model is established. The measured data is then imported into the model for calculation using linear regression analysis. This allows for the accurate emission flux of greenhouse gases from water bodies.

[0047] Features and advantages of device optimization:

[0048] (1) Continuous Sampling Optimization: In terms of continuous sampling, the device adopts continuous sampling technology at different frequencies to achieve real-time capture of the temporal variation information of greenhouse gas emissions from water bodies. This optimization not only solves the uncertainty problem in emission flux estimation caused by the low sampling frequency of traditional static floating box technology, but also enables accurate measurement over a long period of time without interruption. This not only significantly reduces the input of human resources and instrument testing costs, but also improves the accuracy and reliability of measurement data.

[0049] (2) Improved Gas Mixing and Measurement Accuracy: Gas mixing and measurement accuracy are also important aspects of device optimization. The device integrates a mixing fan, effectively enhancing the uniformity of gas mixing within the built-in sampler, thereby improving measurement accuracy. Simultaneously, thermometers and flow meters are provided, allowing direct reading of the temperature and pressure of the gas inside the built-in sampler, facilitating accurate calculation of greenhouse gas emission fluxes. These configurations not only simplify the operation process but also reduce measurement errors, providing more accurate data support for scientific research and practical applications.

[0050] (3) Long-term continuous sampling guarantee: Regarding long-term continuous sampling guarantee, the device is equipped with inlet and outlet sampling bags, enabling long-term continuous gas sample collection. This optimization ensures dynamic monitoring of greenhouse gas emission fluxes in water bodies, providing continuous and reliable monitoring data for scientific research and practical applications. This function plays a crucial role in both climate change research and water environment management practices.

[0051] The method for measuring fugitive area source gas emissions follows three key steps: (1) Record and fix the built-in sampler to the designated location, and determine the height h and bottom area A of the built-in sampler; (2) Collect greenhouse gas samples at preset time intervals, and record the temperature, pressure and gas concentration inside the built-in sampler at each sampling time; (3) Use the ideal gas law to derive the emission flux calculation formula that takes into account the temperature and pressure changes inside the built-in sampler, and calculate the slope by fitting the regression equation, thereby obtaining the monitoring results of fugitive area source gas emissions.

[0052] In summary, this patented technical solution effectively solves many problems in the monitoring of greenhouse gas emissions from water bodies by comprehensively optimizing hardware equipment and measurement methods. It not only improves the accuracy and real-time performance of monitoring, but also expands the scope of application, enabling it to be applied not only to aquatic environments, but also to terrestrial ecosystems and other greenhouse gas emission sources. It has significant scientific and technological value and social benefits for promoting the accuracy of carbon emission accounting.

[0053] The method for measuring fugitive area source gas emissions in this patent includes the following three main steps.

[0054] Step 1: Record the dimensions of the built-in sampler and fix the built-in sampler at the specified sampling point location. The recorded dimensions of the built-in sampler include: the height of the built-in sampler and the bottom area A of the built-in sampler.

[0055] Step 2: Sample greenhouse gases at preset sampling time intervals and record the temperature and pressure inside the built-in sampler at each sampling time, and detect the concentration of the gas sample collected at each sampling time.

[0056] Step 3: Derive the emission flux calculation formula considering temperature and pressure changes within the built-in sampler based on the ideal gas law. Using the combined variable values ​​of temperature T, pressure P, and gas sample concentration c within the built-in sampler at each sampling time, and the t value, fit and calculate the regression equation. Substitute the slope of the regression equation into the emission flux calculation formula to obtain the monitoring results of fugitive area source emissions. Ideal gas law:

[0057] PV=nRT

[0058] Equation (1)

[0059] According to the definition of emission flux F—the mass emitted per unit area per unit time—that is:

[0060]

[0061] Equation (2)

[0062] In equation (2), the emission flux is F, with units of kilograms per square meter per second (kg / (m²·s)), and the release area is A, with units of square meters (m²). T0 and P0 are the temperature and pressure constants under standard conditions, generally T0 = 273.15 K, i.e. 0°C, and P0 = 101.325 kPa (usually calculated as 101.25 kPa to approximate standard atmospheric pressure).

[0063] For different target gases, such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), their corresponding densities ρ0 under standard conditions need to be selected. Taking these gases as examples, their molar masses are 0.044 kg / mol, 0.016 kg / mol, and 0.044 kg / mol, respectively, corresponding to standard densities of 1.964 kg / m³·h, 0.714 kg / m³·h, and 1.964 kg / m³·h at a known measurement height. Gas density typically does not change with time but varies with temperature and pressure. Therefore, when calculating gas emission fluxes, factors such as gas properties, temperature, pressure, and release area must be comprehensively considered. The gas density ρ0 mentioned above is a standard density value under specific temperature and pressure conditions, used as a reference value in specific emission flux calculation models.

[0064] Based on gas sample data collected at different time points from t1 to t6 (including temperature t1-t6, pressure P1-P6, and gas concentration c1-c6), these measured data were analyzed using linear regression to construct a fitted curve, aiming to identify the trend of gas concentration changes over time. By differentiating the fitted regression equation, the slope kN of the linear regression equation can be obtained, representing the rate of change of gas emission flux with time t. If the slope is 6, it means that under certain conditions, the gas emission flux increases by an average of 6 units per unit time.

[0065] In practice, a more specific sampling strategy is adopted: six gas samples are collected within 30 minutes at non-uniform intervals (2 minutes, 5 minutes, 10 minutes, 15 minutes, 20 minutes, and 30 minutes). This sampling mode is designed to fully capture the temporal variation characteristics of greenhouse gas emissions from water bodies. The acquired dataset allows for the effective establishment and solution of a linear regression equation, and the slope of the calculated regression equation reflects the changing trend of the gas emission rate. When the goodness of fit of the regression equation exceeds 0.9, it means that the adopted sampling strategy and data analysis method can provide highly accurate monitoring results, especially in the monitoring of fugitive area source gas emissions, improving the accuracy and reliability of the monitoring data. Furthermore, this sampling frequency and total time arrangement ensures both monitoring accuracy and the feasibility and convenience of on-site operation, making this patented technical solution demonstrate significant advantages in practical applications.

[0066] The advantages of this patent compared to existing technologies are:

[0067] (1) Real-time monitoring capability: By adopting a dynamic gas and high-frequency sampling strategy, this patent can capture the instantaneous changes in greenhouse gas emissions from water bodies in real time, solving the problem that traditional static floating box technology cannot reflect short-term rapid fluctuations in real time, improving time resolution, and making emission flux estimation more accurate and reliable. (2) Continuous monitoring function: The device is equipped with an inlet sampling bag and an outlet sampling bag, which, together with the dynamic gas mixing system, can achieve long-term continuous monitoring without interrupting sampling. This helps to better grasp the time series characteristics of greenhouse gas emissions from water bodies and makes up for the uncertainty and omissions caused by the previous technology that could only perform interval sampling. (3) Improved measurement accuracy: By integrating components such as mixing fans, thermometers, and pressure gauges to enhance measurement accuracy, the gas mixing is ensured to be uniform and the gas state parameters are accurately measured. Combined with the ideal gas state equation and regression analysis calculation, the calculation of emission flux is more accurate, reducing the uncertainty caused by human error and environmental influence. (4) Wide range of applications: In addition to its application in the study of greenhouse gas emissions from water bodies, this patent can also be applied to the determination of greenhouse gas emission fluxes in terrestrial ecosystems, especially in the monitoring of fugitive emission areas in the waste treatment industry, demonstrating its broad application prospects and adaptability. It has direct practical value and technical advantages for carbon emission management in the waste treatment industry. (5) Technological advantages: Through technological innovation, this patent provides a new and efficient tool for global greenhouse gas emission monitoring, playing a crucial role in deepening the understanding of the global greenhouse gas cycle mechanism and promoting the accuracy of carbon emission accounting.

[0068] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A dynamic water body greenhouse gas emission flux monitoring device, comprising a main shell (1), characterized in that: A plurality of flip-up assembly frames (2) are movably mounted on the outer side of the main housing (1) via a lateral bracket. A solar power panel (3) is fixedly mounted on the side wall of the flip-up assembly frame (2). A rotary locking switch (4) is installed on the side wall of the flip-up assembly frame (2). A buoyancy base plate (5) is installed on the bottom of the main housing (1) and the outer side of the flip-up assembly frame (2). A bottom sampling groove (6) with an opening at the lower end is opened inside the buoyancy base plate (5). A built-in sampler is fixedly mounted inside the main housing (1). A built-in adjustable drive unit is installed inside the built-in sampler. The built-in sampler includes an internal collection housing (11) fixed on the bottom surface of the main housing (1), a temperature sensor (12), a pressure sensor (13) fixed on the top surface of the internal collection housing (11), a mixing fan (14), an embedded sampling air pump (15) installed on the inner arc surface of the internal collection housing (11), and a sampling distributor (16) fixed on the outer surface of the embedded sampling air pump (15). An external guide pipe (17) is fixedly mounted on the outer surface of the sampling distributor (16). A detachable air bag (18) is installed at the air outlet on the outside of the external guide pipe (17). The built-in adjustable drive unit includes a bottom adjustable support rod (19) fixedly installed on the top surface inside the internal acquisition housing (11), a bottom guide shroud (20) axially fixed to the bottom protruding end of the bottom adjustable support rod (19), an electrically controlled drive pump (21) installed inside the bottom guide shroud (20), and an electrically controlled adjustable shroud (22) installed on the arc-shaped opening on the outside of the bottom guide shroud (20). The bottom of the main shell (1) and the corresponding position of the buoyancy bottom plate (5) are provided with circular telescopic openings (23) that cooperate with the bottom guide shroud (20). The electrically controlled regulating cover (22) includes an annular regulating cover (221) fitted on the side opening of the bottom guide cover (20), a regulating motor (222) fixed on the upper surface of the bottom guide cover (20), and a regulating gear (223) axially fixed on the regulating motor (222).

2. The dynamic water body greenhouse gas emission flux monitoring device according to claim 1, characterized in that: The upper surface of the main housing (1) is fixedly fitted with an upwardly protruding limiting screw (7), and the upper end of the limiting screw (7) is threaded with a top lifting handle (8).

3. The dynamic water body greenhouse gas emission flux monitoring device according to claim 2, characterized in that: The flip assembly frame (2) is movably fitted with a top cover plate (9) that cooperates with the limiting screw (7) on the outer side, and the end of the top cover plate (9) is fixed with an offset end limiting ring (10).

4. The dynamic water body greenhouse gas emission flux monitoring device according to claim 1, characterized in that: The bottom guide shroud (20) has a circular inlet at the bottom, and a metal filter screen (24) is fixed inside the circular inlet.

5. A method for applying the dynamic water body greenhouse gas emission flux monitoring device according to any one of claims 1-4, characterized in that: Flip the flip assembly frame (2) on the outer side of the main housing (1) outward to the horizontal, and then control the rotary locking switch (4) to rotate so that the flip assembly frame (2) is fixed on the outside of the main housing (1) to form a large area support platform. Use the solar power panel (3) on the support platform to power all the electrical control mechanisms on the device. Then use the bottom of the main housing (1) and the buoyancy plate (5) on the flip assembly frame (2) for floating support so that the support platform is placed on the surface of the water body to be tested, ensuring that the built-in sampler is closely attached to the surface of the water body through the buoyancy plate (5) to form an effective gas sampling area. After deployment, continuous gas sampling and data recording are carried out. The air in the bottom gas sampling area is drawn into the internal collection housing (11) by the electrically controlled pump (21). Then, the internal air is fully mixed by the mixing fan (14). Then, the air is introduced into the detachable gas bag (18) through the sampling distributor (16) and the external guide pipe (17) by the embedded sampling air pump (15). Sampling is carried out one by one. The sampling work is carried out at intervals according to the preset time to cover the emission changes from short cycle to long cycle. At each sampling time, the gas concentration, temperature and pressure data in the built-in sampler are recorded synchronously to ensure that the time variability characteristics of greenhouse gas emissions in water bodies are fully captured. By combining the ideal gas law with measured gas concentration, temperature and pressure data, a mathematical model is established. The measured data is then imported into the model for calculation using linear regression analysis. This allows for the accurate emission flux of greenhouse gases from water bodies.

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