Date: May 10, 2017. 
Author: Zitely A. Tzompa-Sosa. 
Institution: Colorado State University
Title of the netcdf files: "C2H6_global_anth_biof”

Each of the twelve netcdf files contain monthly global ethane (C2H6) emissions
corresponding to the year 2010 as described in Tzompa-Sosa et al. (2017). 
The emission included in these files correspond to global C2H6 anthropogenic and 
biofuel sources.

Article: "Revisiting global fossil fuel and biofuel emissions of ethane"
Authors: Z. A. Tzompa-Sosa, E. Mahieu, B. Franco, C. A. Keller, A. J. Turner, 
         D. Helmig, A. Fried, D. Richter, P. Weibring, J. Walega, T. I. Yacovitch,
         S. C. Herndon, D. R. Blake, F. Hase, J. W. Hannigan , S. Conway, 
         K. Strong, M. Schneider, and E. V. Fischer

Abstract:
Recent measurements over the Northern Hemisphere indicate that the long-term 
decline in the atmospheric burden of ethane (C2H6) has ended and the abundance 
increased dramatically between 2010 and 2014. The rise in C2H6 atmospheric 
abundances has been attributed to oil and natural gas extraction in North America. 
Existing global C2H6 emission inventories are based on outdated activity maps that 
do not account for current oil and natural gas exploitation regions. We present an 
updated global C2H6 emission inventory based on 2010 satellite-derived CH4 fluxes 
with adjusted C2H6 emissions over the U.S. from the National Emission Inventory 
(NEI 2011). We contrast our global 2010 C2H6 emission inventory with one developed 
for 2001. The C2H6 difference between global anthropogenic emissions is subtle 
(7.9 versus 7.2 Tg yr1), but the spatial distribution of the emissions is distinct.
In the 2010 C2H6 inventory, fossil fuel sources in the Northern Hemisphere represent
half of global C2H6 emissions and 95% of global fossil fuel emissions. Over the U.S.,
unadjusted NEI 2011 C2H6 emissions produce mixing ratios that are 14–50% of those 
observed by aircraft observations (2008–2014). When the NEI 2011 C2H6 emission totals 
are scaled by a factor of 1.4, the Goddard Earth Observing System Chem model largely 
reproduces a regional suite of observations, with the exception of the central U.S., 
where it continues to underpredict observed mixing ratios in the lower troposphere. 
We estimate monthly mean contributions of fossil fuel C2H6 emissions to ozone and 
peroxyacetyl nitrate surface mixing ratios over North America of ~1% and ~8%, 
respectively.

Acknowledgementes: 
Funding for Zitely A. Tzompa-Sosa was provided by the Consejo Nacional de Ciencia y 
Tecnología (CONACYT) under fellowship 216028, Mario Molina para Ciencias Ambientales 
fund, at the Colorado State University Department of Atmospheric Science Assisting 
Students, Cultivating Excellence, Nurturing Talent (ASCENT) fund. Support for Emily 
V. Fischer was provided by the US National Oceanic and Atmospheric Administration
under award NA14OAR4310148. Emmanuel Mahieu is a research associate with F.R.S.-FNRS 
(Brussels, Belgium). Bruno Franco is supported by a Marie Curie COFUND postdoctoral 
fellow grant cofunded by the University of Liège and the European Union (FP7-PEOPLE, 
project ID 600405). Funding for Donald Blake was provided by NASA grant NAG5 8935. 
Frank Hase acknowledges support by Uwe Raffalski and Peter Voelger from the Swedish 
Institute of Space Physics for ensuring the continuous operation of the FTIR spectrometer 
in Kiruna. The National Center for Atmospheric Research is supported by the National 
Science Foundation. The Toronto measurements were made at the University of Toronto 
Atmospheric Observatory (TAO), which has been supported by CFCAS, ABB Bomem, CFI, CSA, 
EC, NSERC, ORDCF, PREA, and the University of Toronto. Analysis of the Toronto NDACC 
data was supported by the CAFTON project, funded by the Canadian Space Agency’s FAST 
Program. We acknowledge the International Foundation High Altitude Research Stations 
Jungfraujoch and Gornergrat (HFSJG, Bern) for supporting the facilities needed to perform 
the Jungfraujoch observations. The global VOC flask analyses are a component of NOAA’s 
Cooperative USA- and global-scale Greenhouse Gas Reference flask sampling network, which 
is supported in part by NOAA Climate Program Office’s AC4 program. The 2010 C2H6 emission 
inventory can be accessed via the Colorado State University Digital Repository at 
http:// hdl.handle.net/10217/178758.