Reference : Recent ethane increase above North America: comparison between FTIR measurements and ...
Scientific congresses and symposiums : Unpublished conference/Abstract
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/182788
Recent ethane increase above North America: comparison between FTIR measurements and model simulations
English
Franco, Bruno mailto [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
Bader, Whitney [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) >]
Bovy, Benoît [Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe infra-rouge de phys. atmosph. et solaire (GIRPAS) >]
Fischer, E. V. [Colorado State University > > > >]
Tzompa-Sosa, Z. A. [Colorado State University > > > >]
Strong, K. [University of Toronto - U of T > > > >]
Conway, S. [University of Toronto - U of T > > > >]
Hannigan, J. W. [NCAR Boulder > > > >]
Nussbaumer, E. [NCAR Boulder > > > >]
Sudo, K. [Nagoya University > > > >]
Bernath, P. F. [Old Dominion University > > > >]
Boone, C. D. [University of Waterloo > > > >]
Walker, K. A. [University of Toronto - U of T > > > >]
11-Jun-2015
No
No
International
2015 Joint NDACC-IRWG/TCCON Meeting
June 8 - 12, 2015
University of Toronto
Toronto, ON
Canada
[en] recent ethane increase ; NDACC FTIR measurements ; GEOS-CHem simulations
[en] Ethane (C2H6) has a large impact on tropospheric composition and air quality because of its involvement in the global VOC (volatile organic compound) – HOx – NOx chemistry responsible for generating and destroying tropospheric ozone. By acting as a major sink for tropospheric OH radicals, the abundance of C2H6 influences the atmospheric content of carbon monoxide and impacts the lifetime of methane. Moreover, it is an important source of PAN, a thermally unstable reservoir for NOx radicals.
On a global scale, the main sources of C2H6 are leakage from the production, transport of natural gas loss, biofuel consumption and biomass burning, mainly located in the Northern Hemisphere. Due to its relatively long lifetime of approximately two months, C2H6 is a sensitive indicator of tropospheric pollution and transport.
Using an optimized retrieval strategy (see Franco et al., 2014), we present here a 20-year long-term time series of C2H6 column abundance retrieved from ground-based Fourier Transform InfraRed (FTIR) solar spectra recorded from 1994 onwards at the high-altitude station of Jungfraujoch (Swiss Alps, 46.5° N, 3580 m a.s.l.), part of the Network for the Detection of Atmospheric Composition Change (NDACC, see http://www.ndacc.org). After a regular 1994 – 2008 decrease of the C2H6 amounts, which is very consistent with prior major studies (e.g., Aydin et al., 2011; Simpson et al., 2012) and our understanding of global C2H6 emissions, trend analysis using a bootstrap resampling tool reveals a C2H6 upturn and a statistically-significant sharp burden increase from 2009 onwards (Franco et al., 2014).
We hypothesize that this observed recent increase in C2H6 could affect the whole Northern Hemisphere and may be related to the recent massive growth in the exploitation of shale gas and tight oil reservoirs. This hypothesis is supported by measurements derived from solar occultation observations performed since 2004 by the Atmospheric Chemistry Experiment – Fourier Transform Spectrometer (ACE-FTS) instrument and at other NDACC sites, namely Toronto (44° N) and Thule (77° N). Indeed, the recent rates of changes characterizing these data sets are consistent in magnitude and sign with the one derived from the FTIR measurements at Jungfraujoch. In contrast, the ethane time series form Lauder (45° S) shows a monotonic decrease over the last two decades.
Investigating both the cause and impact on air quality of the C2H6 upturn should be a high priority for the atmospheric chemistry community.
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; AGACC-II project of the Science for Sustainable Development (SSD) program of the Belgian Science Policy Office (BELSPO, Brussels)
Researchers
http://hdl.handle.net/2268/182788

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