Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model

doi:10.5194/acp-17-883-2017

GSTDTAP > 地球科学

DOI	10.5194/acp-17-883-2017
	Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model
	Tamás Kovács, Wuhu Feng, Anna Totterdill, John M. C. Plane, Sandip Dhomse, Juan Carlos Gómez-Martín, Gabriele P. Stiller, Florian J. Haenel, Christopher Smith, Piers M. Forster, Rolando R. García, Daniel R. Marsh, and Martyn P. Chipperfield
	2017-01-20
发表期刊	Atmospheric Chemistry and Physics
出版年	2017
英文摘要	We have used the Whole Atmosphere Community Climate Model (WACCM), with an updated treatment of loss processes, to determine the atmospheric lifetime of sulfur hexafluoride (SF₆). The model includes the following SF₆ removal processes: photolysis, electron attachment and reaction with mesospheric metal atoms. The Sodankylä Ion Chemistry (SIC) model is incorporated into the standard version of WACCM to produce a new version with a detailed D region ion chemistry with cluster ions and negative ions. This is used to determine a latitude- and altitude-dependent scaling factor for the electron density in the standard WACCM in order to carry out multi-year SF₆ simulations. The model gives a mean SF₆ lifetime over an 11-year solar cycle (τ) of 1278 years (with a range from 1120 to 1475 years), which is much shorter than the currently widely used value of 3200 years, due to the larger contribution (97.4 %) of the modelled electron density to the total atmospheric loss. The loss of SF₆ by reaction with mesospheric metal atoms (Na and K) is far too slow to affect the lifetime. We investigate how this shorter atmospheric lifetime impacts the use of SF₆ to derive stratospheric age of air. The age of air derived from this shorter lifetime SF₆ tracer is longer by 9 % in polar latitudes at 20 km compared to a passive SF₆ tracer. We also present laboratory measurements of the infrared spectrum of SF₆ and find good agreement with previous studies. We calculate the resulting radiative forcings and efficiencies to be, on average, very similar to those reported previously. Our values for the 20-, 100- and 500-year global warming potentials are 18 000, 23 800 and 31 300, respectively.
领域	地球科学
URL	查看原文
引用统计	被引频次：46[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/287907
专题	地球科学
推荐引用方式 GB/T 7714	Tamás Kovács, Wuhu Feng, Anna Totterdill, John M. C. Plane, Sandip Dhomse, Juan Carlos Gómez-Martín, Gabriele P. Stiller, Florian J. Haenel, Christopher Smith, Piers M. Forster, Rolando R. García, Daniel R. Marsh, and Martyn P. Chipperfield. Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model[J]. Atmospheric Chemistry and Physics,2017.
APA	Tamás Kovács, Wuhu Feng, Anna Totterdill, John M. C. Plane, Sandip Dhomse, Juan Carlos Gómez-Martín, Gabriele P. Stiller, Florian J. Haenel, Christopher Smith, Piers M. Forster, Rolando R. García, Daniel R. Marsh, and Martyn P. Chipperfield.(2017).Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model.Atmospheric Chemistry and Physics.
MLA	Tamás Kovács, Wuhu Feng, Anna Totterdill, John M. C. Plane, Sandip Dhomse, Juan Carlos Gómez-Martín, Gabriele P. Stiller, Florian J. Haenel, Christopher Smith, Piers M. Forster, Rolando R. García, Daniel R. Marsh, and Martyn P. Chipperfield."Determination of the atmospheric lifetime and global warming potential of sulfur hexafluoride using a three-dimensional model".Atmospheric Chemistry and Physics (2017).