HR: 0800h
AN: A51B-0032    [Abstracts]
TI: Optimal Estimation of the Soil Uptake Rate of Molecular Hydrogen from AGAGE and Other Measurements
AU: * Xiao, X
EM: xuexiao@mit.edu
AF: Dept. of Earth, Atmospheric and Planetary Sciences, MIT, Bldg. 54-1312, 77 Mass. Ave., Cambridge, MA 02139 United States
AU: Prinn, R G
EM: rprinn@mit.edu
AF: Dept. of Earth, Atmospheric and Planetary Sciences, MIT, Bldg. 54-1312, 77 Mass. Ave., Cambridge, MA 02139 United States
AU: Huang, J
EM: jhuang@mit.edu
AF: Dept. of Earth, Atmospheric and Planetary Sciences, MIT, Bldg. 54-1312, 77 Mass. Ave., Cambridge, MA 02139 United States
AU: Simmonds, P G
EM: petergsimmonds@aol.com
AF: School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS United Kingdom
AU: Steele, L P
EM: paul.steele@csiro.au
AF: CSIRO Marine and Atmospheric Research, 107-121 Station Street, Aspendale, VIC 3195 Australia
AU: Langenfelds, R L
EM: ray.langenfelds@csiro.au
AF: CSIRO Marine and Atmospheric Research, 107-121 Station Street, Aspendale, VIC 3195 Australia
AU: O'Doherty, S
EM: s.odoherty@bris.ac.uk
AF: School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS United Kingdom
AU: Krummel, P B
EM: paul.krummel@csiro.au
AF: CSIRO Marine and Atmospheric Research, 107-121 Station Street, Aspendale, VIC 3195 Australia
AU: Fraser, P J
EM: paul.fraser@csiro.au
AF: CSIRO Marine and Atmospheric Research, 107-121 Station Street, Aspendale, VIC 3195 Australia
AU: Porter, L W
EM: L.Porter@bom.gov.au
AF: CSIRO Marine and Atmospheric Research, 107-121 Station Street, Aspendale, VIC 3195 Australia
AU: Weiss, R F
EM: rfw@gaslab.ucsd.edu
AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, La Jolla, CA 92093 United States
AU: Salameh, P
EM: psalameh@ucsd.edu
AF: Scripps Institution of Oceanography, UCSD, 9500 Gilman Drive, La Jolla, CA 92093 United States
AU: Wang, R H
EM: raywang@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332 United States
AB: Hydrogen (H₂), a proposed clean energy alternative, warrants detailed investigation of its global budget and future environmental impacts. The major (presumably microbial) soil sink of hydrogen has been estimated from high frequency in situ AGAGE H₂ observations and also from geographically extensive flask measurements from CSIRO and CMDL using the Kalman filter in a two-dimensional (2-D) global transport model. Hydrogen mole fractions exhibit well-defined seasonal cycles in each hemisphere with their phase difference being only about 3 months. Strong seasonal cycles are deduced for the soil uptake of H₂. Photolysis of formaldehyde (HCHO) is the major immediate atmospheric source of H₂ and the global production rate of H₂ is estimated to be about 61.9 Tg/year. The multi-year average global sink is estimated as 61.8 Tg/year. Soil uptake (42.3 Tg/year) represents the major loss process for H₂ and accounts for 68% of the total destruction. Oxidation by OH (17.8 Tg/year) accounts for 29% of the destruction, with the remainder due to destruction in the stratosphere. The soil sink is a maximum over the northern extratropics in summer. The calculated global burden is 186 Tg, indicating an overall atmospheric lifetime of about 3.0 years. Hydrogen in the troposphere (148 Tg burden) has a lifetime of about 2.4 years.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 0322 Constituent sources and sinks
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005