An examination of the total hydrogen budget of the lower stratosphere

Details An examination of the total hydrogen budget of the lower stratosphere An examination of the total hydrogen budget of the lower stratosphere

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2563d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 23, p. 2563-2566

Physics

53

Air Sampling, Atmospheric Chemistry, Hydrogen, Hydrogen Production, In Situ Measurement, Meteorology, Methane, Photochemical Reactions, Stratosphere, Water Vapor, Annual Variations, Atmospheric Models, Chemical Reactions, Mixing Ratios, Northern Hemisphere, Oxidation

Scientific paper

We analyze the hydrogen budget of the lower stratosphere using simultaneous in situ measurements of northern hemispheric water vapor (H2O) and methane (CH4) obtained during the spring Stratospheric Photochemistry, Aerosols, and Dynamics Expedition (SPADE), as well as previously published in situ H2 data. Based on this data, we conclude that approximately two H2O molecules are produced for each CH4 molecule destroyed. This implies that H2 production from CH4 oxidation is balanced by H2 oxidation. The uncertainty in this analysis is greatly reduced by the use of multiple data sets. Additionally, we infer that, on an annual and global average, H2O enters the stratosphere with a mixing ratio of 4.2 +/- 0.5 ppmv, and that the quasi-conserved quantity 2 x CH4 + H2O has a value of 7.6 +/- 0.6 ppmv in these northern hemishere air parcels (where xi denotes the mixing ratio of the constituent xi).

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