Preprints
https://doi.org/10.5194/acp-2021-503
https://doi.org/10.5194/acp-2021-503

  07 Jul 2021

07 Jul 2021

Review status: a revised version of this preprint is currently under review for the journal ACP.

Impact of stratospheric aerosol intervention geoengineering on surface air temperature in China: A surface energy budget perspective

Zhaochen Liu1,4, Xianmei Lang1,2,3, and Dabang Jiang1,3,4 Zhaochen Liu et al.
  • 1Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
  • 2Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing 210044, China
  • 3CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China
  • 4College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China

Abstract. Stratospheric aerosol intervention (SAI) geoengineering is a rapid, effective, and promising means to counteract anthropogenic global warming, but the climate response to SAI, with great regional disparities, remains uncertain. In this study, we use Geoengineering Model Intercomparison Project G4 experiment simulations from three models (HadGEM2-ES, MIROC-ESM, and MIROC-ESM-CHEM) that offset anthropogenic forcing under medium-low emissions (RCP4.5) by injecting a certain amount of SO2 into the stratosphere every year, to investigate the surface air temperature response to SAI geoengineering over China. It has been shown that the SAI leads to surface cooling over China over the last 40 years of injection simulation (2030–2069), which varies among models, regions and seasons. The spatial pattern of SAI-induced temperature changes over China is mainly due to net surface shortwave radiation changes. We find that changes in solar radiation modification strength, surface albedo, atmospheric water vapor and cloudiness affect surface shortwave radiation. In summer, the increased cloud cover in some regions reduces net surface shortwave radiation, causing strong surface cooling. In winter, both the strong cooling in all three models and the abnormal warming in MIROC-ESM are related to surface albedo changes. Our results suggest that cloud and land surface processes in models may dominate the spatial pattern of SAI-induced surface air temperature changes over China.

Zhaochen Liu et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2021-503', Anonymous Referee #1, 29 Jul 2021
  • RC2: 'Comment on acp-2021-503', Anonymous Referee #2, 29 Jul 2021
  • RC3: 'Comment on acp-2021-503', Anonymous Referee #3, 02 Aug 2021
  • RC4: 'Comment on acp-2021-503', Anonymous Referee #4, 04 Aug 2021

Zhaochen Liu et al.

Zhaochen Liu et al.

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Short summary
Stratospheric aerosol intervention geoengineering is considered a potential means to counteract global warming. Here the impact of stratospheric aerosol intervention geoengineering on surface air temperature over China and related physical processes are investigated. Results show that the increased stratospheric aerosols cause surface cooling over China. The temperature responses vary with models, regions, and seasons and are largely related to net surface shortwave radiation changes.
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