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New and improved infra-red absorption cross sections and ACE-FTS retrievals of carbon tetrachloride (CCl4)

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journal contribution
posted on 09.11.2016, 12:20 by Jeremy J. Harrison, C. D. Boone, P. F. Bernath
Carbon tetrachloride (CCl4) is one of the species regulated by the Montreal Protocol on account of its ability to deplete stratospheric ozone. As such, the inconsistency between observations of its abundance and estimated sources and sinks is an important problem requiring urgent attention (Carpenter et al., 2014) [5]. Satellite remote-sensing has a role to play, particularly limb sounders which can provide vertical profiles into the stratosphere and therefore validate stratospheric loss rates in atmospheric models.This work is in two parts. The first describes new and improved high-resolution infra-red absorption cross sections of carbon tetrachloride/dry synthetic air over the spectral range 700-860cm-1 for a range of temperatures and pressures (7.5-760Torr and 208-296K) appropriate for atmospheric conditions. This new cross-section dataset improves upon the one currently available in the HITRAN and GEISA databases. The second describes a new, preliminary ACE-FTS carbon tetrachloride retrieval that improves upon the v3.0/v3.5 data products, which are biased high by up to ~20-30% relative to ground measurements. Making use of the new spectroscopic data, this retrieval also improves the microwindow selection, contains additional interfering species, and utilises a new instrumental lineshape; it will form the basis for the upcoming v4.0 CCl4 data product.

Funding

We wish to thank the National Centre for Earth Observation (NCEO), funded by the UK Natural Environment Research Council (NERC), for supporting this work and for providing access to the Molecular Spectroscopy Facility (MSF) at the Rutherford Appleton Laboratory (RAL), as well as R.G. Williams and R.A. McPheat for providing technical support at the RAL. The ACE mission is funded primarily by the Canadian Space Agency.

History

Citation

Journal of Quantitative Spectroscopy and Radiative Transfer, Volume 186, January 2017, Pages 139–149

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Source

Satellite Remote Sensing and Spectroscopy: Joint ACE-Odin Meeting, October 2015

Version

VoR (Version of Record)

Published in

Journal of Quantitative Spectroscopy and Radiative Transfer

Publisher

Elsevier for Pergamon

issn

0022-4073

Acceptance date

28/04/2016

Copyright date

2016

Available date

09/11/2016

Publisher version

http://www.sciencedirect.com/science/article/pii/S002240731630108X

Language

en