Technical Note: Propagating correlations in atmospheric inversions using different Kalman update smoothers
Jinyun Tang,Q. Zhuang +1 more
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In this paper, the fixed-lag ensemble square root Kalman smoother and fixed-latency square root sigma-point Kalman smoothing were proposed to propagate correlations between on-line and online state variables.Abstract:
. The scheme to propagate correlations between on-line and off-line state variables in atmospheric inversions using the fixed-lag Kalman smoother proposed in Bruhwiler et al. (2005) is explained as a process to impose a balanced constraint on the on-line state variables. It is then extended to the fixed-lag ensemble square root Kalman smoother and fixed-lag square root sigma-point Kalman smoother, allowing us to treat nonlinear observation operators easily. Further, to constrain the posterior fluxes within their feasible ranges, the constrained fixed-lag Kalman smoother is presented and the variable transform technique is proposed for the other two smoothers. Comparisons between various methods and observational data are conducted using a synthetic inversion of atmospheric CH 4 fluxes. The results indicate that our developed methods are good alternatives to existing methods for conducting sequential inversion of atmospheric trace gases. It is also shown that the benefit to include the correlations between on-line and off-line state variables is case dependent.read more
Citations
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Journal ArticleDOI
Carbon flux estimation for Siberia by inverse modeling constrained by aircraft and tower CO2 measurements
Tazu Saeki,Shamil Maksyutov,Motoki Sasakawa,Toshinobu Machida,Mikhail Arshinov,Pieter P. Tans,Thomas J. Conway,M. Saito,Vinu Valsala,Tomohiro Oda,Tomohiro Oda,Robert J. Andres,Dmitry Belikov +12 more
TL;DR: In this article, the first results of atmospheric CO2 inversions utilizing measurements from a Siberian tower network (Japan-Russia Siberian Tall Tower Inland Observation Network; JR-STATION) and four aircraft sites, in addition to surface background flask measurements by the National Oceanic and Atmospheric Administration (NOAA), were presented.
Carbon flux estimation for Siberia by inverse modeling constrained by aircraft and tower CO 2 measurements
Tazu Saeki,Shamil Maksyutov,Motoki Sasakawa,Toshinobu Machida,Mikhail Arshinov,Pieter P. Tans,T. J. Conway,M. Saito,Vinu Valsala,Tomohiro Oda,Robert J. Andres +10 more
Posted ContentDOI
Technical Note: Methods for interval constrained atmospheric inversion of methane
Jinyun Tang,Qianlai Zhuang +1 more
TL;DR: In this paper, three interval constrained methods, including interval constrained Kalman smoother, the interval constrained maximum likelihood ensemble smoother and interval constrained ensemble Kalman smooth, were developed to conduct inversions of atmospheric trace gas methane (CH 4 ).
References
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