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The imprint of stratospheric transport on column-averaged methane

Ostler, A.; Sussmann, R.; Patra, P. K.; Wennberg, P. O.; Deutscher, N. M.; Griffith, D. W. T.; Blumenstock, T.; Hase, F.; Kivi, R.; Warneke, T.; Wang, Z.; De Maziere, M.; Robinson, J.; Ohyama, H.

Model simulations of column-averaged methane mixing ratios (XCH4) are extensively used for inverse estimates of methane (CH4) emissions from atmospheric measurements. Our study shows that virtually all chemical transport models (CTM) used for this purpose are affected by stratospheric model-transport errors. We quantify the impact of such model transport errors on the simulation of stratospheric CH4 concentrations via an a posteriori correction method. This approach compares measurements of the mean age of air with modeled age and expresses the difference in terms of a correction to modeled stratospheric CH4 mixing ratios. We find age differences up to ~ 3 years yield to a bias in simulated CH4 of up to 250 parts per billion (ppb). Comparisons between model simulations and ground-based XCH4 observations from the Total Carbon Column Network (TCCON) reveal that stratospheric model-transport errors cause biases in XCH4 of ~ 20 ppb in the midlatitudes and ~ 27 ppb in the arctic region. Improved overall as well as seasonal model-observation agreement in XCH4 suggests that the proposed, age-of-air-based stratospheric correction is reasonable. ... mehr

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DOI: 10.5445/IR/1000049937
DOI: 10.5194/acpd-15-20395-2015
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Spurenstoffe und Fernerkundung (IMK-ASF)
Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 1680-7367, 1680-7375
KITopen-ID: 1000049937
HGF-Programm 12.03.01 (POF III, LK 01)
Erschienen in Atmospheric chemistry and physics / Discussions
Band 15
Heft 14
Seiten 20395-20447
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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