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Concentration and δD of molecular hydrogen in boreal forests: Ecosystem-scale systematics of atmospheric H_2

Rahn, Thom and Eiler, John M. and Kitchen, Nami and Fessenden, Julianna E. and Randerson, James T. (2002) Concentration and δD of molecular hydrogen in boreal forests: Ecosystem-scale systematics of atmospheric H_2. Geophysical Research Letters, 29 (18). Art. No. 1888. ISSN 0094-8276. doi:10.1029/2002GL015118. https://resolver.caltech.edu/CaltechAUTHORS:20121031-135240882

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Abstract

We examined the concentration and δD of atmospheric H2 in a boreal forest in interior Alaska to investigate the systematics of high latitude soil uptake at ecosystem scale. Samples collected during nighttime inversions exhibited vigorous H_2 uptake, with concentration negatively correlated with the concentration of CO_2 (−0.8 to −1.2 ppb H_2 per ppm CO_2) and negatively correlated with δD of H_2. We derived H_2 deposition rates of between 2 to 12 nmol m^(−2) s^(−1). These rates are comparable to those observed in lower latitude ecosystems. We also derive an average fractionation factor, α = D:H_(residual)/D:H_(consumed) = 0.94 ± 0.01 and suggestive evidence that α depends on forest maturity. Our results show that high northern latitude soils are a significant sink of molecular hydrogen indicating that the record of atmospheric H_2 may be sensitive to changes in climate and land use.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2002GL015118DOIArticle
ORCID:
AuthorORCID
Randerson, James T.0000-0001-6559-7387
Additional Information:© 2002 American Geophysical Union. Received 13 March 2002; revised 15 June 2002; accepted 18 June 2002; published 27 September 2002. We gratefully acknowledge support from the Moore Foundation and from a Davidow Grant to Caltech’s Global Environmental Science Program. JTR and JEF acknowledge support from NSF OPP 0097439.
Funders:
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Caltech Global Environmental Science Program Davidow GrantUNSPECIFIED
NSFOPP-0097439
Subject Keywords:Atmospheric Composition and Structure: Biosphere/atmosphere interactions; Atmospheric Composition and Structure: Troposphere—composition and chemistry; Global Change: Biogeochemical processes; Geochemistry: Isotopic composition/chemistry
Issue or Number:18
DOI:10.1029/2002GL015118
Record Number:CaltechAUTHORS:20121031-135240882
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20121031-135240882
Official Citation: Rahn, T., J. M. Eiler, N. Kitchen, J. E. Fessenden, and J. T. Randerson (2002), Concentration and δD of molecular hydrogen in boreal forests: Ecosystem-scale systematics of atmospheric H2, Geophys. Res. Lett., 29(18), 1888, doi:10.1029/2002GL015118.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35212
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:31 Oct 2012 21:11
Last Modified:09 Nov 2021 23:13

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