GB/T 33696-2017 in English

In-depth interpretation of the National Standard of the People's Republic of China GB/T 33696—2017: Specification for land-air and sea-air flux observation

Background of standard formulation and analysis of technical evolution

The National Standard of the People's Republic of China GB/T 33696—2017 is a specification for land-air and sea-air flux observation proposed by the China Meteorological Administration, aiming to unify and standardize the observation methods and technical requirements in related fields in China. The formulation of this standard is based on the internationally accepted micrometeorological theory and turbulent transport research methods, combining the research results and technological progress in this field at home and abroad.

With the deepening of global climate change research, the importance of land-air and sea-air flux observation in the fields of global carbon cycle, energy exchange and marine meteorological forecasting has become increasingly prominent. The introduction of this standard fills the gap in this technical field in China and provides a unified technical basis for scientific research and practical application.

Core framework comparison table

Core observation instruments and technical requirements

Implementation recommendations

1. Observation site selection: The land-air flux observation tower should be installed in the center of the dominant wind direction of the underlying surface, ensuring that there are no obstructions around it; the sea-air flux observation tower should be close to the coast and have an open upwind direction.
2. Instrument calibration cycle: The land environment should be calibrated once every six months, and the marine environment should be calibrated once every quarter to ensure measurement accuracy.
3. Data quality control: The turbulent pulsation data processing method (see Appendix B) and the data quality inspection method (see Appendix C) are used to ensure the reliability and availability of the observation data.
4. Maintenance records: Regularly check the instrument operation status, record the equipment maintenance and calibration, and attach detailed metadata information.