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Title: Seasonal injection strategies for stratospheric aerosol geoengineering

Abstract

Simulations of stratospheric aerosol geoengineering have typically considered injections at a constant rate over the entire year. However, the seasonal variability of both sunlight and the stratospheric circulation suggests seasonally-dependent injection strategies. We simulated single point injections of the same amount of SO2 in each of the four seasons and at five different latitudes (30S, 15S, Equator, 15N, 30N), 5 km above the tropopause. Our findings suggest that injecting only during one season reduces the amount of SO2 needed to achieve a certain aerosol optical depth (AOD), thus potentially reducing some of the side-effects of geoengineering. We find, in particular, that injections at 15N or 15S in spring of the corresponding hemisphere results in the largest reductions in incoming solar radiation. Compared to annual injections, by injecting in the different seasons we identify additional distinct spatiotemporal AOD patterns, thanks to seasonal differences in the stratospheric circulation.

Authors:
 [1];  [1]; ORCiD logo [2];  [3];  [4];  [4];  [1]
  1. Cornell University
  2. BATTELLE (PACIFIC NW LAB)
  3. National Center for Atmospheric Research, PO Box 3000-80307,
  4. University Corporation for Atmospheric Research
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1571489
Report Number(s):
PNNL-SA-146267
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 13
Country of Publication:
United States
Language:
English

Citation Formats

Visioni, Daniele, MacMartin, Douglas, Kravitz, Benjamin S., Tilmes, S, Mills, Mike, Richter, Jadwiga, and Boudreau, Matthew P. Seasonal injection strategies for stratospheric aerosol geoengineering. United States: N. p., 2019. Web. doi:10.1029/2019GL083680.
Visioni, Daniele, MacMartin, Douglas, Kravitz, Benjamin S., Tilmes, S, Mills, Mike, Richter, Jadwiga, & Boudreau, Matthew P. Seasonal injection strategies for stratospheric aerosol geoengineering. United States. doi:10.1029/2019GL083680.
Visioni, Daniele, MacMartin, Douglas, Kravitz, Benjamin S., Tilmes, S, Mills, Mike, Richter, Jadwiga, and Boudreau, Matthew P. Tue . "Seasonal injection strategies for stratospheric aerosol geoengineering". United States. doi:10.1029/2019GL083680.
@article{osti_1571489,
title = {Seasonal injection strategies for stratospheric aerosol geoengineering},
author = {Visioni, Daniele and MacMartin, Douglas and Kravitz, Benjamin S. and Tilmes, S and Mills, Mike and Richter, Jadwiga and Boudreau, Matthew P.},
abstractNote = {Simulations of stratospheric aerosol geoengineering have typically considered injections at a constant rate over the entire year. However, the seasonal variability of both sunlight and the stratospheric circulation suggests seasonally-dependent injection strategies. We simulated single point injections of the same amount of SO2 in each of the four seasons and at five different latitudes (30S, 15S, Equator, 15N, 30N), 5 km above the tropopause. Our findings suggest that injecting only during one season reduces the amount of SO2 needed to achieve a certain aerosol optical depth (AOD), thus potentially reducing some of the side-effects of geoengineering. We find, in particular, that injections at 15N or 15S in spring of the corresponding hemisphere results in the largest reductions in incoming solar radiation. Compared to annual injections, by injecting in the different seasons we identify additional distinct spatiotemporal AOD patterns, thanks to seasonal differences in the stratospheric circulation.},
doi = {10.1029/2019GL083680},
journal = {Geophysical Research Letters},
number = 13,
volume = 46,
place = {United States},
year = {2019},
month = {7}
}

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