[en] In this paper, we present an optimized retrieval strategy for carbonyl sulfide (OCS), using Fourier transform infrared (FTIR) solar observations made at the high-altitude Jungfraujoch station in the Swiss Alps. More than 200 lines of the nu3 fundamental band of OCS have been systematically evaluated and we selected 4 microwindows on the basis of objective criteria minimizing the effect of interferences, mainly by solar features, carbon dioxide and water vapor absorption lines, while maximizing the information content. Implementation of this new retrieval strategy provided an extended time series of the OCS abundance spanning the 1995-2015 time period, for the study of the long-term trend and seasonal variation of OCS in the free troposphere and stratosphere.
Three distinct periods characterize the evolution of the tropospheric partial columns: a first decreasing period (1995-2002), an intermediate increasing period (2002-2008), and the more recent period (2008-2015) which shows no significant trend. Our FTIR tropospheric and stratospheric time series are compared with new in situ gas chromatography mass spectrometry (GCMS) measurements performed by Empa (Laboratory for Air Pollution/Environmental Technology) at the Jungfraujoch since 2008, and with space-borne solar occultation observations by the ACE-FTS instrument on-board the SCISAT satellite, respectively, and they show good agreement. The OCS signal recorded above Jungfraujoch appears to be closely related to anthropogenic sulfur emissions.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lejeune, Bernard ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Mahieu, Emmanuel ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Vollmer, M. K.
Reimann, S.
Bernath, P. F.
Boone, C. D.
Walker, K. A.
Servais, Christian ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS)
Language :
English
Title :
Optimized approach to retrieve information on atmospheric carbonyl sulfide (OCS) above the Jungfraujoch station and change in its abundance since 1995
Publication date :
2017
Journal title :
Journal of Quantitative Spectroscopy and Radiative Transfer
ISSN :
0022-4073
Publisher :
Pergamon Press - An Imprint of Elsevier Science, Oxford, United Kingdom
Special issue title :
Special Issue - Satellite Remote Sensing and Spectroscopy: Joint ACE-Odin Meeting, October 2015
BELSPO - Service Public Fédéral de Programmation Politique scientifique [BE] Federal Office for Meteorology and Climatology MeteoSwitzerland [CH] F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] CSA - Canadian Space Agency [CA] Federal Office for the Environment [CH]
Funding text :
The University of Liège involvement was primarily supported by BELSPO (Belgian Federal Science Policy Office, Brussels) through the ACROSAT project and by the GAW-CH program of MeteoSwiss. We are also grateful to the Fédération Wallonie-Bruxelles and the F.R.S. – FNRS for supporting mission expenses and laboratory developments, respectively. Emmanuel Mahieu is a Research Associate with theF.R.S. – FNRS. We are grateful to the many Belgian colleagues who have performed the FTIR observations used here. The Atmospheric Chemistry Experiment (ACE), also known as SCISAT, is a Canadian-led mission supported primarily by the Canadian Space Agency. The ground-based GCMS measurements are conducted unde the auspices of the HALCLIM project funded by theSwiss Federal Office for the Environment (FOEN). We thank the International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG, Bern) for supporting the facilities needed to perform the FTIR and GCMS measurements.
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