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7714009 
Journal Article 
Global modelling studies of hydrogen and its isotopomers using STOCHEM-CRI: Likely radiative forcing consequences of a future hydrogen economy 
Derwent, RG; Stevenson, DS; Utembe, SR; Jenkin, ME; Khan, AH; Shallcross, DE 
2020 
Yes 
International Journal of Hydrogen Energy
ISSN: 0360-3199 
Elsevier 
OXFORD 
45 
15 
9211-9221 
English 
WOS:000523643400103 
A global chemistry-transport model has been employed to describe the global sources and sinks of hydrogen (H-2) and its isotopomer (HD). The model is able to satisfactorily describe the observed tropospheric distributions of H-2 and HD and deliver budgets and turnovers which agree with literature studies. We than go on to quantify the methane and ozone responses to emission pulses of hydrogen and their likely radiative forcing consequences. These radiative forcing consequences have been expressed on a 1 Tg basis and integrated over a hundred-year time horizon. When compared to the consequences of a 1 Tg emission pulse of carbon dioxide, 1 Tg of hydrogen causes 5 +/- 1 times as much time-integrated radiative forcing over a hundred-year time horizon. That is to say, hydrogen has a global warming potential (GWP) of 5 +/- 1 over a hundred-year time horizon. The global warming warming potential (GWP) of 5 +/- 1 over a hundred-year time horizon. The global warming consequences of a hydrogen-based low-carbon energy system therefore depend critically on the hydrogen leakage rate. If the leakage of hydrogen from all stages in the production, distribution, storage and utilisation of hydrogen is efficiently curtailed, then hydrogen- based energy systems appear to be an attractive proposition in providing a future replacement for fossil-fuel based energy systems. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. 
Hydrogen economy; Hydrogen leakage; Global warming potential; GWP; Radiative forcing; Global environmental impacts 
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY