A calibration method and system for longwave radiation meters

By establishing a longwave radiation calculation model using meteorological parameters and CO2 flux at the station, the problem of longwave radiation meter calibration relying on standard meters was solved, enabling independent calibration and ensuring the continuity and cost savings of measurement work.

CN116399447BActive Publication Date: 2026-06-30INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
Filing Date
2023-04-24
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing methods for calibrating longwave radiometers rely on standard longwave radiometers and calibration equipment, which consume a lot of manpower and resources, cause interruptions in measurement work, and result in high transportation costs.

Method used

By using station measurement data and the principle of energy balance, a longwave radiation calculation model is established. Using meteorological parameters and CO2 flux, calibration coefficients are obtained, enabling the autonomous calibration of the longwave radiation meter.

Benefits of technology

Calibration work is carried out at the station to ensure the continuity of measurement work, save calibration equipment and transportation costs, and improve work efficiency.

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Abstract

This invention discloses a calibration method and system for longwave radiometers, relating to the field of longwave radiometer calibration technology. The method includes: acquiring meteorological parameters and CO2 flux data measured at a target station using the top-of-atmosphere longwave radiation value as a standard; determining the optimal energy state for expressing the physicochemical and biological processes involved in radiative transfer (such as absorption and attenuation of longwave radiation by CO2 and atmospheric substances) and their interactions based on the variation patterns of radiation, the meteorological parameters, and the CO2 flux; and obtaining calibration coefficients based on the optimal energy state by determining the values ​​and ranges of temperature, humidity, surface water vapor pressure, and CO2 flux, and calibrating the longwave radiometer. The calibration work designed in this invention can be performed during routine on-site measurements at the station, ensuring the continuity of the measurement work.
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