Synchronous measurement n 2 o, ch 4 and co 2 Flux Eddy Correlation Apparatus

Abstract

The invention provides an eddy-covariance technique device and an eddy-covariance technique method for simultaneously measuring net exchange fluxes of N2O, CH4 and CO2 based on a single gas analyzer.By integrating effective software and hardware including a ultrasonic anemometer, a gas sampling system, a closed circuit gas analyzer, a calibration system, and a data collecting and processing device, the synchronous, efficient and accurate measurement of net exchange fluxes of N2O, CH4 and CO2 is realized based on the principle of an eddy-covariance technique. The ultrasonic anemometer measuresthe three-dimensional wind speed. The gas sampling system collects air samples and delivers the air samples to the closed circuit gas analyzer. The closed loop gas analyzer measures the concentrationof N2O, CH4, and CO2 contained in the air samples from the gas sampling system. The calibration system calibrates the closed circuit gas analyzer. The data collecting and processing device receives,stores, and processes the three-dimensional wind speed and gas concentration data measured by the ultrasonic anemometer and the closed-loop gas analyzer, and calculates the net exchange fluxes of N2O,CH4, and CO2 based on the eddy-covariance technique principle.

Description

technical field [0001] The invention relates to the field of measurement of greenhouse gas fluxes, in particular to a method based on a single gas analyzer for synchronous measurement of N 2 O, CH 4 and CO 2 Apparatus and method for eddy correlation method of net exchange flux. Background technique [0002] Nitrous oxide (N 2 O), methane (CH 4 ) and carbon dioxide (CO 2 ) is a greenhouse gas that is strictly regulated by the United Nations Framework Convention on Global Climate Change and its Kyoto Protocol, and these three gases are also an important part of the carbon and nitrogen biogeochemical cycle of terrestrial ecosystems. Establishment of the relationship between terrestrial ecosystems and the atmosphere N 2 O, CH 4 and CO 2 Net exchange flux (that is, the N emitted or absorbed by a unit area to the atmosphere in a unit time 2 O, CH 4 and CO 2 Reliable quantitative techniques and methods will help to clarify the source and sink changes of these gases and t...

AI Technical Summary

Problems solved by technology

Choosing a closed-circuit gas analyzer means that a large-flow air pump needs to be configured to draw air into the analyzer. This involves how to reasonably configure and combine various instrument hardware to integrate them into a system device, and also involves a series of factors that directly affect the flux results. Key technical issues, including: how to design a gas sampling system suitable for field conditions and regulate a reasonable sampling flow rate, how to accurately correct the time difference between wind speed and gas concentration data, and how to accurately calculate gas flux based on the obtained three-dimensional wind speed and gas concentration data etc. At present, there is no related invention patent report of this kind of synchronous measurement of N based on the principle of eddy correlation method. 2 O, CH 4 and CO 2 Flux device, and there is no relevant patent that proposes a specific solution to the above technical problems

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