The Climate Response to Stratospheric Aerosol Geoengineering Can Be Tailored Using Multiple Injection Locations
Abstract
By injecting different amounts of SO2 at multiple different latitudes, the spatial pattern of aerosol optical depth (AOD) can be partially controlled. This leads to the ability to influence the climate response to geoengineering with stratospheric aerosols, providing the potential for design. In this work, we use simulations from the fully coupled whole-atmosphere chemistry climate model CESM1(WACCM) to demonstrate that by appropriately combining injection at just four different locations, 30°S, 15°S, 15°N, and 30°N, then three spatial degrees of freedom of AOD can be achieved: an approximately spatially uniform AOD distribution, the relative difference in AOD between Northern and Southern Hemispheres, and the relative AOD in high versus low latitudes. For forcing levels that yield 1–2°C cooling, the AOD and surface temperature response are sufficiently linear in this model so that the response to different combinations of injection at different latitudes can be estimated from single-latitude injection simulations; nonlinearities associated with both aerosol growth and changes to stratospheric circulation will be increasingly important at higher forcing levels. Optimized injection at multiple locations is predicted to improve compensation of CO2-forced climate change relative to a case using only equatorial aerosol injection (which overcools the tropics relative to high latitudes). The additionalmore »
- Authors:
-
- Cornell Univ., Ithaca, NY (United States); California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Atmospheric Science and Global Change Div. (ASGC)
- National Center for Atmospheric Research, Boulder, CO (United States)
- Climate and Global Dynamics LaboratoryNational Center for Atmospheric Research Boulder CO USA
- Publication Date:
- Research Org.:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
- Sponsoring Org.:
- National Science Foundation (NSF); USDOE Office of Science (SC), Biological and Environmental Research (BER); Defense Advanced Research Projects Agency (DARPA)
- OSTI Identifier:
- 1430440
- Report Number(s):
- PNNL-SA-124473
Journal ID: ISSN 2169-897X; 453040135
- Grant/Contract Number:
- AC05-76RL01830
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 23; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; geoengineering; stratospheric aerosols; design
Citation Formats
MacMartin, Douglas G., Kravitz, Ben, Tilmes, Simone, Richter, Jadwiga H., Mills, Michael J., Lamarque, Jean‐Francois, Tribbia, Joseph J., and Vitt, Francis. The Climate Response to Stratospheric Aerosol Geoengineering Can Be Tailored Using Multiple Injection Locations. United States: N. p., 2017.
Web. doi:10.1002/2017JD026868.
MacMartin, Douglas G., Kravitz, Ben, Tilmes, Simone, Richter, Jadwiga H., Mills, Michael J., Lamarque, Jean‐Francois, Tribbia, Joseph J., & Vitt, Francis. The Climate Response to Stratospheric Aerosol Geoengineering Can Be Tailored Using Multiple Injection Locations. United States. https://doi.org/10.1002/2017JD026868
MacMartin, Douglas G., Kravitz, Ben, Tilmes, Simone, Richter, Jadwiga H., Mills, Michael J., Lamarque, Jean‐Francois, Tribbia, Joseph J., and Vitt, Francis. Thu .
"The Climate Response to Stratospheric Aerosol Geoengineering Can Be Tailored Using Multiple Injection Locations". United States. https://doi.org/10.1002/2017JD026868. https://www.osti.gov/servlets/purl/1430440.
@article{osti_1430440,
title = {The Climate Response to Stratospheric Aerosol Geoengineering Can Be Tailored Using Multiple Injection Locations},
author = {MacMartin, Douglas G. and Kravitz, Ben and Tilmes, Simone and Richter, Jadwiga H. and Mills, Michael J. and Lamarque, Jean‐Francois and Tribbia, Joseph J. and Vitt, Francis},
abstractNote = {By injecting different amounts of SO2 at multiple different latitudes, the spatial pattern of aerosol optical depth (AOD) can be partially controlled. This leads to the ability to influence the climate response to geoengineering with stratospheric aerosols, providing the potential for design. In this work, we use simulations from the fully coupled whole-atmosphere chemistry climate model CESM1(WACCM) to demonstrate that by appropriately combining injection at just four different locations, 30°S, 15°S, 15°N, and 30°N, then three spatial degrees of freedom of AOD can be achieved: an approximately spatially uniform AOD distribution, the relative difference in AOD between Northern and Southern Hemispheres, and the relative AOD in high versus low latitudes. For forcing levels that yield 1–2°C cooling, the AOD and surface temperature response are sufficiently linear in this model so that the response to different combinations of injection at different latitudes can be estimated from single-latitude injection simulations; nonlinearities associated with both aerosol growth and changes to stratospheric circulation will be increasingly important at higher forcing levels. Optimized injection at multiple locations is predicted to improve compensation of CO2-forced climate change relative to a case using only equatorial aerosol injection (which overcools the tropics relative to high latitudes). The additional degrees of freedom can be used, for example, to balance the interhemispheric temperature gradient and the equator to pole temperature gradient in addition to the global mean temperature. Further research is needed to better quantify the impacts of these strategies on changes to long-term temperature, precipitation, and other climate parameters.},
doi = {10.1002/2017JD026868},
journal = {Journal of Geophysical Research: Atmospheres},
number = 23,
volume = 122,
place = {United States},
year = {Thu Dec 07 00:00:00 EST 2017},
month = {Thu Dec 07 00:00:00 EST 2017}
}
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