RE: [geo] Fwd: Dust as a solar shield

[Stephen Salter]

Hi All
We might also need technology to remove lunar dust during some future ice age.
Stephen

Emeritus Professor of Engineering Design
School of Engineering
University of Edinburgh
Mayfield Road
Edinburgh EH9 3DW
Scotland
0131 650 5704 or 0131 662 1180
YouTube Jamie Taylor Power for Change



From: geoengineering@googlegroups.com  On 
Behalf Of ayesha iqbal
Sent: 09 February 2023 10:11
To: geoengineering@googlegroups.com
Subject: [geo] Fwd: Dust as a solar shield

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https://journals.plos.org/climate/article?id=10.1371/journal.pclm.133

Authors

Benjamin C. 
Bromley,
 Sameer H. 
Khan,
 Scott J. 
Kenyon

8 February 2023
Citation: Bromley BC, Khan SH, Kenyon SJ (2023) Dust as a solar shield. PLOS 
Clim 2(2): e133. https://doi.org/10.1371/journal.pclm.133

Abstract

We revisit dust placed near the Earth–Sun L1 Lagrange point as a possible 
climate-change mitigation measure. Our calculations include variations in grain 
properties and orbit solutions with lunar and planetary perturbations. To 
achieve sunlight attenuation of 1.8%, equivalent to about 6 days per year of an 
obscured Sun, the mass of dust in the scenarios we consider must exceed 1010 
kg. The more promising approaches include using high-porosity, fluffy grains to 
increase the extinction efficiency per unit mass, and launching this material 
in directed jets from a platform orbiting at L1. A simpler approach is to 
ballistically eject dust grains from the Moon’s surface on a free trajectory 
toward L1, providing sun shade for several days or more. Advantages compared to 
an Earth launch include a ready reservoir of dust on the lunar surface and less 
kinetic energy required to achieve a sun-shielding orbit.

Source: PLOS Climate
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[geo] Fwd: Dust as a solar shield

[ayesha iqbal]

https://journals.plos.org/climate/article?id=10.1371/journal.pclm.133

*Authors*

Benjamin C. Bromley,

 Sameer H. Khan,

 Scott J. Kenyon



*8 February 2023*
*Citation*: Bromley BC, Khan SH, Kenyon SJ (2023) Dust as a solar shield.
PLOS Clim 2(2): e133. https://doi.org/10.1371/journal.pclm.133

Abstract

We revisit dust placed near the Earth–Sun L1 Lagrange point as a possible
climate-change mitigation measure. Our calculations include variations in
grain properties and orbit solutions with lunar and planetary
perturbations. To achieve sunlight attenuation of 1.8%, equivalent to about
6 days per year of an obscured Sun, the mass of dust in the scenarios we
consider must exceed 1010 kg. The more promising approaches include using
high-porosity, fluffy grains to increase the extinction efficiency per unit
mass, and launching this material in directed jets from a platform orbiting
at L1. A simpler approach is to ballistically eject dust grains from the
Moon’s surface on a free trajectory toward L1, providing sun shade for
several days or more. Advantages compared to an Earth launch include a
ready reservoir of dust on the lunar surface and less kinetic energy
required to achieve a sun-shielding orbit.

Source: PLOS Climate

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