Potential Environmental Impacts of Hydrogen-based Transportation and Power Systems Page: 8 of 244
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in the Mojave Desert. D) Truncated normal probability density of soil
moisture in the Mojave Desert............................................................................. 5-5
Figure 5-3 A) Distribution of soil uptake of hydrogen in boreal forest. B) Distribution
of soil uptake of hydrogen in Mojave Desert....................................................... 5-6
Figure 6-1 Graphs of Annual Mean Concentrations of Criteria Air Pollutants in the
U .S . from 1990-2008 ..........................................................................................6-4
Figure C -1 G lobal H ydrogen C ycle ...................................................................................... C -3
Figure C-2 Sources and Sinks for Global Hydrogen Budget ................................................ C-4
Figure C-3 Present and Projected Atmospheric Hydrogen mole fractions based on
T rom p et al...................................................................................................... . C -5
Figure C-4 Predicted Hydrogen Burden and Mixing Ratio in Troposphere under
Present D ay C onditions.................................................................................. C -11
Figure C-5 Predicted Hydrogen Burden and Mixing Ratios in Stratosphere under
Present Day Conditions..................................................................................... C-12
Figure C-6 Tropospheric Hydrogen Mixing Ratios from 1993-2008 in Tasmania and
Ireland .............................................................................................................. C-13
Figure C-7 Studies of Hydrogen Deposition Velocity ....................................................... C-14
Figure C-8 Studies of Hydrogen Uptake......................................................................... C-15
Figure C-9 Sensitivity of Hydrogen Mixing Ratio to Deposition Velocity ................... C-16
Figure C-10 Influence of hydrogen leakage rates on incremental tropospheric and
stratospheric hydrogen mixing ratios ........................................................... C-18
Figure C-11 Comparison of Exact and Approximate Changes of Hydrogen Mass in
Troposphere ...................................................................................................... C-20
Figure C-12 Effects of time variable source terms and hydrogen leakage on hydrogen
mixing ratios in the troposphere ...................................................................... C-21
Figure C-13 Relative soil uptake versus hydrogen concentration......................................... C-22
Figure C-14 Global soil uptake of hydrogen using two approaches: (a) linear uptake
with respect to hydrogen concentration and; (b) Wuebbles-non-linear
approach............................................................................................................ C-23
Figure C-15 Relative soil uptake versus hydrogen concentration: Wuebbles approach,
and non-linear best fit Wuebbles data............................................................... C-24
Figure C-16 Projected Hydrogen Mixing Ratios During the 21s Century for Hydrogen
Uptake Governed by the Work of Wuebbles.................................................... C-25
Figure D-1 Representative time required for diffusion of hydrogen in soil.......................... D-9
Figure D-2 A) Hydrogen profile over depth for different soil temperatures. B)
Hydrogen flux into soil under three soil moisture conditions....................... D-10
Figure D-3 A) Hydrogen mixing ratio beneath snow cover for different snow cover
depths. B) Hydrogen flux into soil beneath snow cover............................... D-11
Figure D-4 A) Soil temperature limitation function. B) Soil moisture limitation
function ...................................................................................................... . . D -14
Figure D-5 A) Truncated normal probability density of the temperature in the boreal
forest. B) Truncated normal probability density of soil moisture in the
boreal forest. C) Truncated normal probability density of the temperature
in the Mojave Desert. D) Truncated normal probability density of soil
m oisture in the M ojave D esert...................................................................... D -15vi
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Grieb, Thomas M.; Mills, W. B.; Jacobson, Mark Z.; Summers, Karen V. & Crossan, A. Brook. Potential Environmental Impacts of Hydrogen-based Transportation and Power Systems, report, December 31, 2010; United States. (https://digital.library.unt.edu/ark:/67531/metadc831251/m1/8/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.