stratospheric sulfate geoengineering could enhance the terrestrial photosynthesis rate
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2016
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Abstract
Stratospheric sulfate geoengineering could impact the terrestrial carbon
cycle by enhancing the carbon sink. With an 8 Tg yr−1 injection of
SO2 to produce a stratospheric aerosol cloud to balance anthropogenic
radiative forcing from the Representative Concentration Pathway 6.0 (RCP6.0)
scenario, we conducted climate model simulations with the Community Earth
System Model – the Community Atmospheric Model 4 fully coupled to
tropospheric and stratospheric chemistry (CAM4–chem). During the
geoengineering period, as compared to RCP6.0, land-averaged downward visible
(300–700 nm) diffuse radiation increased 3.2 W m−2 (11 %). The enhanced diffuse radiation
combined with the cooling increased plant photosynthesis by
0.07 ± 0.02 µmol C m−2 s−1, which could
contribute to an additional 3.8 ± 1.1 Gt C yr−1 global gross
primary productivity without explicit nutrient limitation. This increase
could potentially increase the land carbon sink. Suppressed plant and soil
respiration due to the cooling would reduce natural land carbon emission and
therefore further enhance the terrestrial carbon sink during the
geoengineering period. This potentially beneficial impact of stratospheric
sulfate geoengineering would need to be balanced by a large number of
potential risks in any future decisions about the implementation of
geoengineering.
| Reference Key |
xia2016atmosphericstratospheric
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|---|---|
| Authors | ;L. Xia;A. Robock;S. Tilmes;R. R. Neely III;R. R. Neely III |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-1479-2016
|
| URL | |
| Keywords |
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