26.07.2021

# New Publications

0 Comments

Weisenstein, Debra K.; et al. (2021): A Model Intercomparison of Stratospheric Solar Geoengineering by Accumulation-Mode Sulfate Aerosols

Weisenstein, Debra K.; Visioni, Daniele; Franke, Henning; Niemeier, Ulrike; Vattioni, Sandro; Chiodo, Gabriel et al. (2021): A Model Intercomparison of Stratospheric Solar Geoengineering by Accumulation-Mode Sulfate Aerosols. Preprint. In Atmospheric Chemistry and Physics. DOI: 10.5194/acp-2021-569.

"The intercomparison explores how the injection of new accumulation-mode particles changes the large-scale particle size distribution and thus the overall radiative and dynamical response to sulfate aerosol injection."

LINK


Read more »

11.05.2021

# New Publications

0 Comments

Bhowmick, Mansi; et al. (2021): Response of the Indian summer monsoon to global warming, solar geoengineering and its termination

Bhowmick, Mansi; Mishra, Saroj Kanta; Kravitz, Ben; Sahany, Sandeep; Salunke, Popat (2021): Response of the Indian summer monsoon to global warming, solar geoengineering and its termination. In Sci Rep 11 (1), p. 9791. DOI: 10.1038/s41598-021-89249-6.

The response of the Indian Summer Monsoon (ISM) to global warming, solar geoengineering and its termination is examined using the multi-model mean of seven global climate model simulations from G2 experiment of the Geoengineering Model Intercomparison Project.

LINK


Read more »

22.03.2021

# New Publications

0 Comments

Kravitz, Ben; et al. (2021): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP)

Kravitz, Ben; MacMartin, Douglas G.; Visioni, Daniele; Boucher, Olivier; Cole, Jason N. S.; Haywood, Jim et al. (2021): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP). In Atmos. Chem. Phys 21 (6), pp. 4231–4247. DOI: 10.5194/acp-21-4231-2021.

"Two generations of models in the Geoengineering Model Intercomparison Project (GeoMIP) have now simulated offsetting a quadrupling of the CO2 concentration with solar reduction. This simulation is idealized and designed to elicit large responses in the models. Here, we show that energetics, temperature, and hydrological cycle changes in this experiment are statistically indistinguishable between the two ensembles."

LINK


Read more »

18.03.2021

# New Publications

0 Comments

Clarke, Leonardo A.; et al. (2021): The Caribbean and 1.5 °C: Is SRM an Option?

Clarke, Leonardo A.; Taylor, Michael A.; Centella-Artola, Abel; St. Williams, Matthew M.; Campbell, Jayaka D.; Bezanilla-Morlot, Arnoldo; Stephenson, Tannecia S. (2021): The Caribbean and 1.5 °C: Is SRM an Option? In Atmosphere 12 (3), p. 367. DOI: 10.3390/atmos12030367.

"This paper examines the mean Caribbean climate under various scenarios of an SRM-altered versus an SRM-unaltered world for three global warming targets, namely, 1.5, 2.0 and 2.5 °C above pre-industrial levels."

LINK


Read more »

11.03.2021

# New Publications

0 Comments

Visioni, Daniele; et al. (2021): Identifying the sources of uncertainty in climate model simulations of solar radiation modification with the G6sulfur and G6solar Geoengineering Model Intercomparison Project (GeoMIP) simulations

Visioni, Daniele; MacMartin, Douglas G.; Kravitz, Ben; Boucher, Olivier; Jones, Andy; Lurton, Thibaut et al. (2021): Identifying the sources of uncertainty in climate model simulations of solar radiation modification with the G6sulfur and G6solar Geoengineering Model Intercomparison Project (GeoMIP) simulations. Preprint. In Atmos. Chem. Phys. DOI: 10.5194/acp-2021-133.

"We present here results from the Geoengineering Model Intercomparison Project (GeoMIP) simulations for the experiment G6sulfur and G6solar for six Earth System Models participating in the Climate Model Intercomparison Project (CMIP) Phase 6. The aim of the experiments is to reduce the warming from that resulting from a high-tier emission scenario (Shared Socioeconomic Pathways SSP5-8.5) to that resulting from a medium-tier emission scenario (SSP2-4.5)."

LINK


Read more »

07.09.2020

# New Publications

0 Comments

Kravitz, Ben; et al. (2020): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP)

Kravitz, Ben; MacMartin, Douglas G.; Visioni, Daniele; Boucher, Olivier; Cole, Jason N. S.; Haywood, Jim et al. (2020): Comparing different generations of idealized solar geoengineering simulations in the Geoengineering Model Intercomparison Project (GeoMIP). In Atmospheric Chemistry and Physics (under review). DOI: 10.5194/acp-2020-732.

"Two generations of models in the Geoengineering Model Intercomparison Project (GeoMIP) have now simulated offsetting a quadrupling of the CO2 concentration with solar reduction. This simulation is artificial and designed to elicit large responses in the models. Here we show that energetics, temperature, and hydrological cycle changes in this experiment are statistically indistinguishable between the two ensembles."

LINK


Read more »

24.08.2020

# New Publications

0 Comments

Jones, Andy; et al. (2020): North Atlantic Oscillation response in GeoMIP experiments G6solar and G6sulfur: why detailed modelling is needed for understanding regional implications of solar radiation management

Jones, Andy; Haywood, Jim M.; Jones, Anthony C.; Tilmes, Simone; Kravitz, Ben; Robock, Alan (2020): North Atlantic Oscillation response in GeoMIP experiments G6solar and G6sulfur: why detailed modelling is needed for understanding regional implications of solar radiation management. In Atmospheric Chemistry and Physics. DOI: 10.5194/acp-2020-802. (in review)

"Proposed SRM schemes aim to increase planetary albedo to reflect more sunlight back to space and induce a cooling that acts to partially offset global warming. Under the auspices of the Geoengineering Model Intercomparion Project, we have performed model experiments whereby global temperature under the high forcing SSP5–8.5 scenario is reduced to follow that of the medium forcing SSP2–4.5 scenario."

LINK


Read more »

01.07.2020

# Media

0 Comments

Harvard SGRP Blog: Ten Years of GeoMIP (Ben Kravitz)

"On this tenth anniversary, I thought it would be interesting to look back at that original GeoMIP paper and see how my thinking has evolved over the past decade."

LINK


Read more »

18.05.2020

# New Publications

0 Comments

Chen, Yating; et al. 2020: “Mitigation of Arctic Permafrost Carbon Loss through Stratospheric Aerosol Geoengineering.”

Chen, Yating, Aobo Liu, and John C. Moore. 2020: “Mitigation of Arctic Permafrost Carbon Loss through Stratospheric Aerosol Geoengineering.” Nature Communications 11 (1). https://doi.org/10.1038/s41467-020-16357-8.

‌"Increasing Earth’s albedo by the injection of sulfate aerosols into the stratosphere has been proposed as a way of offsetting some of the adverse effects of climate change. We examine this hypothesis in respect of permafrost carbon-climate feedbacks using the PInc-PanTher process model driven by seven earth system models running the Geoengineering Model Intercomparison Project (GeoMIP) G4 stratospheric aerosol injection scheme to reduce radiative forcing under the Representative Concentration Pathway (RCP) 4.5 scenario."

LINK


Read more »

04.07.2018

# New Publications

0 Comments

Wang, Qin; et al. (2018): A statistical examination of the effects of stratospheric sulfate geoengineering on tropical storm genesis.

Wang, Qin; Moore, John C.; Ji, Duoying (2018): A statistical examination of the effects of stratospheric sulfate geoengineering on tropical storm genesis. In: Atmos. Chem. Phys 18 (13), S. 9173–9188. DOI: 10.5194/acp-18-9173-2018.

"The thermodynamics of the ocean and atmosphere partly determine variability in tropical cyclone (TC) numberand intensity and are readily accessible from climate model output, but an accurate description of TC variability requiresmuch higher spatial and temporal resolution than the models used in the GeoMIP (Geoengineering Model Intercomparison Project) experiments provide. The genesis potential index (GPI) and ventilation index (VI) are combinations of dynamic and thermodynamic variables that provide proxiesfor TC activity under different climate states. Here we use five CMIP5 models that have run the RCP4.5 experiment and the GeoMIP stratospheric aerosol injection (SAI) G4 experiment to calculate the two TC indices over the 2020 to 2069 period across the six ocean basins that generate TCs."

LINK


Read more »