Analyses of firn gas samples from Dronning Maud Land, Antarctica: Study of nonmethane hydrocarbons and methyl chloride | Zendy

Kaspers K. A. | Zendy; van de Wal R. S. W. | Zendy; de Gouw J. A. | Zendy; Hofstede C. M. | Zendy; van den Broeke M. R. | Zendy; van der Veen C. | Zendy; Neubert R. E. M. | Zendy; Meijer H. A. J. | Zendy; Brenninkmeijer C. A. M. | Zendy; Karlöf L. | Zendy; Winther J.G. | Zendy

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Analyses of firn gas samples from Dronning Maud Land, Antarctica: Study of nonmethane hydrocarbons and methyl chloride

Author(s) -

Kaspers K. A.,

van de Wal R. S. W.,

de Gouw J. A.,

Hofstede C. M.,

van den Broeke M. R.,

van der Veen C.,

Neubert R. E. M.,

Meijer H. A. J.,

Brenninkmeijer C. A. M.,

Karlöf L.,

Winther J.G.

Publication year - 2004

Publication title -

journal of geophysical research: atmospheres

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.67

H-Index - 298

eISSN - 2156-2202

pISSN - 0148-0227

DOI - 10.1029/2003jd003950

Subject(s) - firn , propane , atmospheric sciences , chloride , acetylene , environmental science , climatology , geology , chemistry , geomorphology , glacier , organic chemistry

Firn air was sampled on the Antarctic plateau in Dronning Maud Land (DML), during the Norwegian Antarctic Research Expedition (NARE) 2000/2001. In this paper, we describe the analyses for methyl chloride and nonmethane hydrocarbons (NMHCs) in these firn air samples. For the first time, the NMHCs ethane, propane, and acetylene have been measured in Antarctic firn air, and concentration profiles for these gases have been derived. A one‐dimensional numerical firn air diffusion model was used to interpret the measured profiles and to derive atmospheric concentrations as a function of time. The atmospheric trends we derived for the NMHC and methyl chloride at DML cover the period from 1975 to 2000. Methyl chloride shows a decreasing trend of 1.2 ± 0.6 ppt per year (annual mean concentration 548 ± 32 ppt). For ethane we found an increasing trend of 1.6 ± 0.6 ppt per year (annual mean concentration 241 ± 12 ppt). The concentrations of propane and acetylene appear to be constant over the period 1975–2000, with annual mean concentrations of 30 ± 4 ppt for propane and 24 ± 2 ppt for acetylene.

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