Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology
We investigate the potential of a specific geoengineering technique: the carbon sequestration by artificially en- hanced silicate weathering via the dissolution of olivine. This approach would not only operate against rising temperatures but would also oppose ocean acidification. If details of the m...
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ftawi:oai:epic.awi.de:30162 2024-09-15T18:28:04+00:00 Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology Köhler, Peter Abrams, Jesse Völker, Christoph Wolf-Gladrow, Dieter Hartmann, Jens 2012 application/pdf https://epic.awi.de/id/eprint/30162/ https://epic.awi.de/id/eprint/30162/1/olivine_EGU2012.pdf https://hdl.handle.net/10013/epic.39092 https://hdl.handle.net/10013/epic.39092.d001 unknown Copernicus, Göttingen https://epic.awi.de/id/eprint/30162/1/olivine_EGU2012.pdf https://hdl.handle.net/10013/epic.39092.d001 Köhler, P. orcid:0000-0003-0904-8484 , Abrams, J. , Völker, C. orcid:0000-0003-3032-114X , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Hartmann, J. (2012) Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39092 EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27Geophysical Research Abstracts, Vol. 14, EGU2012-5135, Copernicus, Göttingen Conference notRev 2012 ftawi 2024-06-24T04:05:07Z We investigate the potential of a specific geoengineering technique: the carbon sequestration by artificially en- hanced silicate weathering via the dissolution of olivine. This approach would not only operate against rising temperatures but would also oppose ocean acidification. If details of the marine chemistry are taken into consid- eration, a new mass ratio of CO2 sequestration per olivine dissolution of about 1 is achieved, 20% smaller than previously assumed. We calculate that this approach has the potential to sequestrate up to 1 Pg of C per year di- rectly, if olivine is distributed as fine powder over land areas of the humid tropics, but this rate is limited by the saturation concentration of silicic acid. These upper limit sequestration rates come at the environmental cost of pH values in the rivers rising to 8.2 in examples for the rivers Amazon and Congo (Köhler et al., 2010). The secondary effects of the input of silicic acid connected with this approach leads in an ecosystem model (Re- COM2.0 in MITgcm) to species shifts aways from the calcifying species towards diatoms, thus altering the biolog- ical carbon pumps. Open ocean dissolution of olivine would sequestrate about 1 Pg CO2 per Pg olivine from which about 8% are caused by changes in the biological pumps (increase export of organic matter, decreased export of CaCO3). The chemical impact of open ocean dissolution of olivine (the increased alkalinity input) is therefore less efficient than dissolution on land, but leads due to different chemical impacts to a higher surface ocean pH enhancement to counteract ocean acidification. We finally investigate open ocean dissolution rates of up to 10 Pg olivine per year corresponding to geoengineering rates which might be of interest in the light of expected future emission (e.g. A2 scenario with emissions rising to 30 PgC/yr in 2100 AD). Those rates would still sequestrate only less than 20% of the emission until 2100, but would require that the nowadays available shipping capacity of tankers and bulk ... Conference Object Ocean acidification Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
We investigate the potential of a specific geoengineering technique: the carbon sequestration by artificially en- hanced silicate weathering via the dissolution of olivine. This approach would not only operate against rising temperatures but would also oppose ocean acidification. If details of the marine chemistry are taken into consid- eration, a new mass ratio of CO2 sequestration per olivine dissolution of about 1 is achieved, 20% smaller than previously assumed. We calculate that this approach has the potential to sequestrate up to 1 Pg of C per year di- rectly, if olivine is distributed as fine powder over land areas of the humid tropics, but this rate is limited by the saturation concentration of silicic acid. These upper limit sequestration rates come at the environmental cost of pH values in the rivers rising to 8.2 in examples for the rivers Amazon and Congo (Köhler et al., 2010). The secondary effects of the input of silicic acid connected with this approach leads in an ecosystem model (Re- COM2.0 in MITgcm) to species shifts aways from the calcifying species towards diatoms, thus altering the biolog- ical carbon pumps. Open ocean dissolution of olivine would sequestrate about 1 Pg CO2 per Pg olivine from which about 8% are caused by changes in the biological pumps (increase export of organic matter, decreased export of CaCO3). The chemical impact of open ocean dissolution of olivine (the increased alkalinity input) is therefore less efficient than dissolution on land, but leads due to different chemical impacts to a higher surface ocean pH enhancement to counteract ocean acidification. We finally investigate open ocean dissolution rates of up to 10 Pg olivine per year corresponding to geoengineering rates which might be of interest in the light of expected future emission (e.g. A2 scenario with emissions rising to 30 PgC/yr in 2100 AD). Those rates would still sequestrate only less than 20% of the emission until 2100, but would require that the nowadays available shipping capacity of tankers and bulk ... |
format |
Conference Object |
author |
Köhler, Peter Abrams, Jesse Völker, Christoph Wolf-Gladrow, Dieter Hartmann, Jens |
spellingShingle |
Köhler, Peter Abrams, Jesse Völker, Christoph Wolf-Gladrow, Dieter Hartmann, Jens Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
author_facet |
Köhler, Peter Abrams, Jesse Völker, Christoph Wolf-Gladrow, Dieter Hartmann, Jens |
author_sort |
Köhler, Peter |
title |
Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
title_short |
Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
title_full |
Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
title_fullStr |
Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
title_full_unstemmed |
Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
title_sort |
impact of geoengineering with olivine dissolution on the carbon cycle and marine biology |
publisher |
Copernicus, Göttingen |
publishDate |
2012 |
url |
https://epic.awi.de/id/eprint/30162/ https://epic.awi.de/id/eprint/30162/1/olivine_EGU2012.pdf https://hdl.handle.net/10013/epic.39092 https://hdl.handle.net/10013/epic.39092.d001 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
EPIC3EGU General Assembly 2012, Vienna, 2012-04-22-2012-04-27Geophysical Research Abstracts, Vol. 14, EGU2012-5135, Copernicus, Göttingen |
op_relation |
https://epic.awi.de/id/eprint/30162/1/olivine_EGU2012.pdf https://hdl.handle.net/10013/epic.39092.d001 Köhler, P. orcid:0000-0003-0904-8484 , Abrams, J. , Völker, C. orcid:0000-0003-3032-114X , Wolf-Gladrow, D. orcid:0000-0001-9531-8668 and Hartmann, J. (2012) Impact of geoengineering with olivine dissolution on the carbon cycle and marine biology , EGU General Assembly 2012, Vienna, 22 April 2012 - 27 April 2012 . hdl:10013/epic.39092 |
_version_ |
1810469377279000576 |