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DOI	10.5194/acp-19-1753-2019
	Kinetic mass-transfer calculation of water isotope fractionation due to cloud microphysics in a regional meteorological model
	Tsai I.-C.; Chen W.-Y.; Chen J.-P.; Liang M.-C.
发表日期	2019
ISSN	16807316
起始页码	1753
结束页码	1766
卷号	19 期号:3
英文摘要	In conventional atmospheric models, isotope exchange between liquid, gas, and solid phases is usually assumed to be in equilibrium, and the highly kinetic phase transformation processes inferred in clouds are yet to be fully investigated. In this study, a two-moment microphysical scheme in the National Center for Atmospheric Research (NCAR) Weather Research and Forecasting (WRF) model was modified to allow kinetic calculation of isotope fractionation due to various cloud microphysical phase-change processes. A case of a moving cold front is selected for quantifying the effect of different factors controlling isotopic composition, including water vapor sources, atmospheric transport, phase transition pathways of water in clouds, and kineticversus-equilibrium mass transfer. A base-run simulation was able to reproduce the ∼ 50% decrease in dD that was observed during the frontal passage. Sensitivity tests suggest that all the above factors contributed significantly to the variations in isotope composition. The thermal equilibrium assumption commonly used in earlier studies may cause an overestimate of mean vapor-phase dD by 11%, and the maximum difference can be more than 20%. Using initial vertical distribution and lower boundary conditions of water stable isotopes from satellite data is critical to obtain successful isotope simulations, without which the dD in water vapor can be off by about 34% and 28%, respectively. Without microphysical fractionation, the dD in water vapor can be off by about 25%. © 2019 Author(s).
语种	英语
scopus关键词	atmospheric modeling; cloud microphysics; isotopic composition; isotopic fractionation; mass transfer; reaction kinetics; weather forecasting
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144656
作者单位	Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Department of Atmospheric Sciences, National Taiwan University, Taipei, Taiwan; Central Weather Bureau, Taipei, Taiwan; International Degree Program on Climate Change and Sustainable Development, National Taiwan University, Taipei, Taiwan; Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan
推荐引用方式 GB/T 7714	Tsai I.-C.,Chen W.-Y.,Chen J.-P.,et al. Kinetic mass-transfer calculation of water isotope fractionation due to cloud microphysics in a regional meteorological model[J],2019,19(3).
APA	Tsai I.-C.,Chen W.-Y.,Chen J.-P.,&Liang M.-C..(2019).Kinetic mass-transfer calculation of water isotope fractionation due to cloud microphysics in a regional meteorological model.Atmospheric Chemistry and Physics,19(3).
MLA	Tsai I.-C.,et al."Kinetic mass-transfer calculation of water isotope fractionation due to cloud microphysics in a regional meteorological model".Atmospheric Chemistry and Physics 19.3(2019).