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Towards the Optimization of TanSat-2: Assessment of a Large-Swath Methane Measurement

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Publicado no:Remote Sensing vol. 17, no. 3 (2025), p. 543
Autor principal: Zhu, Sihong
Outros Autores: Yang, Dongxu, Liang, Feng, Tian, Longfei, Liu, Yi, Cao, Junji, Wu, Kai, Cai, Zhaonan, Palmer, Paul I
Publicado em:
MDPI AG
Assuntos:
Cytotoxicity
Swath width
Accuracy
Configuration management
Lymphocytes T
Orbits
Methane
Northern Hemisphere
Aerosols
Transport processes
Earth orbits
Performance evaluation
Kalman filters
Bias
Systematic errors
Random errors
Greenhouse gases
Satellite configurations
Regions
Estimates
Elliptical orbits
Satellite observation
Fluxes
Satellites
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Resumo:To evaluate the potential of an upcoming large-swath satellite for estimating surface methane (CH₄) fluxes at a weekly scale, we report the results from a series of observing system simulation experiments (OSSEs) that use an established modeling framework that includes the GEOS-Chem 3D atmospheric transport model and an ensemble Kalman filter. These experiments focus on the sensitivity of CH₄ flux estimates to systematic errors (<inline-formula>μ</inline-formula>) and random errors (<inline-formula>σ</inline-formula>) in the column average methane (XCH4) measurements. Our control test (INV_CTL) demonstrates that with median errors (<inline-formula>μ</inline-formula> = 1.0 ± 0.9 ppb and <inline-formula>σ</inline-formula> = 6.9 ± 1.6 ppb) in XCH₄ measurements over a 1000 km swath, global CH4 fluxes can be estimated with an accuracy of 5.1 ± 1.7%, with regional accuracies ranging from 3.8% to 21.6% across TransCom sub-continental regions. The northern hemisphere mid-latitudes show greater reliability and consistency across varying <inline-formula>μ</inline-formula> and <inline-formula>σ</inline-formula> levels, while tropical and boreal regions exhibit higher sensitivity due to limited high-quality observations. In <inline-formula>σ</inline-formula>-sensitive regions, such as the North American boreal zone, expanding the swath width from 1000 km to 3000 km significantly reduces discrepancies, while such adjustments provide limited improvements for <inline-formula>μ</inline-formula>-sensitive regions like North Africa. For TanSat-2 mission, with its elliptical medium Earth orbit and 1500 km swath width, the global total estimates achieved an accuracy of 3.1 ± 2.2%. Enhancing the swath width or implementing a dual-satellite configuration is proposed to further improve TanSat-2 inversion performance.
ISSN:2072-4292
DOI:10.3390/rs17030543
Fonte:Advanced Technologies & Aerospace Database