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Contribution of oil and natural gas production to renewed increase of atmospheric methane (2007-2014): top-down estimate from ethane and methane column observations

Hausmann, P.; Sussmann, R.; Smale, D.

Abstract:
Abstract. Harmonized time series of column-averaged mole fractions of atmospheric methane and ethane over the period 1999–2014 are derived from solar Fourier transform infrared (FTIR) measurements at the Zugspitze summit (47° N, 11° E; 2964 m a.s.l.) and at Lauder (45° S, 170° E; 370 m a.s.l.). Long-term trend analysis reveals a consistent renewed methane increase since 2007 of 6.2 [5.6, 6.9] ppb yr−1 (parts-per-billion per year) at the Zugspitze and 6.0 [5.3, 6.7] ppb yr−1 at Lauder (95 % confidence intervals). Several recent studies provide pieces of evidence that the renewed methane increase is most likely driven by two main factors: (i) increased methane emissions from tropical wetlands, followed by (ii) increased thermogenic methane emissions due to growing oil and natural gas production. Here, we quantify the magnitude of the second class of sources, using long-term measurements of atmospheric ethane as a tracer for thermogenic methane emissions. In 2007, after years of weak decline, the Zugspitze ethane time series shows the sudden onset of a significant positive trend (2.3 [1.8, 2.8]  ×  10−2 ppb yr−1 for 2007–2014), while a ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.5194/acp-16-3227-2016
ISSN: 1680-7316, 1680-7324
URN: urn:nbn:de:swb:90-532752
KITopen ID: 1000053275
HGF-Programm 12.03.01; LK 01
Erschienen in Atmospheric chemistry and physics
Band 16
Heft 6
Seiten 3227-3244
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
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