Articles | Volume 29, issue 1
Nonlin. Processes Geophys., 29, 123–131, 2022
Nonlin. Processes Geophys., 29, 123–131, 2022
Research article
24 Mar 2022
Research article | 24 Mar 2022

Characteristics of intrinsic non-stationarity and its effect on eddy-covariance measurements of CO2 fluxes

Lei Liu et al.

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Subject: Scaling, multifractals, turbulence, complex systems, self-organized criticality | Topic: Climate, atmosphere, ocean, hydrology, cryosphere, biosphere | Techniques: Theory
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Cited articles

Andersson, A., Sjöblom, A., Sahlée, E., and Falck, E., and Rutgersson, A.: Enhanced Air–Sea Exchange of Heat and Carbon Dioxide Over a High Arctic Fjord During Unstable Very-Close-to-Neutral Conditions, Bound.-Lay. Meteorol., 170, 471–488, 2019. a
Angevine, W. M., Edwards, J. M., Lothon, M., LeMone, M. A., and Osborne, S. R.: Transition periods in the diurnally-varying atmospheric boundary layer over land, Bound.-Lay. Meteorol., 177, 205–223, 2020. a
Cava, D., Mortarini, L., Giostra, U., Acevedo, O., and Katul, G.: Submeso motions and intermittent turbulence across a nocturnal low-level jet: A self-organized criticality analogy, Bound.-Lay. Meteorol., 172, 17–43, 2019. a
Celani, A. and Seminara, A.: Large-scale Structure of Passive Scalar, Phys. Rev. Lett., 94, 214503,, 2005. a
Cheng, X. L., Zeng, Q. C., and Hu, F.: Characteristics of gusty wind disturbances and turbulent fluctuations in windy atmospheric boundary layer behind cold fronts, J. Geophys. Res.-Atmos., 116, D06101,, 2011. a
Short summary
We find a new kind of non-stationarity. This new kind of non-stationarity is caused by the intrinsic randomness. Results show that the new kind of non-stationarity is widespread in small-scale variations of CO2 turbulent fluxes. This finding reminds us that we need to handle the short-term averaged turbulent fluxes carefully, and we also need to re-screen the existing non-stationarity diagnosis methods because they could make a wrong diagnosis due to this new kind of non-stationarity.