# Numerical Fit Modeling for Temperature Mitigation in
## 1 Introduction
Therefore, the proposed material will be referred to as a calcite plume. Logistical challenges include being able to find appropriate mineral deposits near the implementation site. For dispersal from towers, the towers would have to encircle a city so that it would be protected when the wind is from any direction. The towers would need to be closely spaced so that Gaussian dispersal would create an even plume. The distribution of materials to the towers could burden local transportation infrastructure. Alternatively, dispersal from aircraft requires modification of aircraft and the construction of a new dedicated airport for each protected city. The total mass of calcite required depends on the wind speed and the particle size range. Particle size strongly affects optical properties [7; 8; 9]. [PERSON] et al. [8] investigated calcite in the nanometer range for use in the stratosphere. The mass required is less for smaller particles because there are more reflection surfaces per mass for smaller particles. Therefore, smaller particles are preferred for efficiency. Whichever size is picked, the mass would be adjusted to provide the desired level of SRM. In this research, the solar radiation would be reduced by half. Two size ranges will be considered, 3 to 5 microns and 10 to 12 microns. The number of particles released depends on the wind speed, because the plan is to maintain a constant reduction in the level of solar radiation. This project could have human health effects, but evaluating them is not the focus of this paper. A brief overview of the issue is discussed here. The selection of particles 3 to 5 microns and 10 to 12 microns in size is based on the premise that particles smaller than 2.5 microns and 10 microns make it further into the lungs with varying consequences. A dispersion model was performed with the method of Turner [10] to estimate the particle concentrations near the ground. When dispersed from aircraft, the worst-case scenario concentration is 0.3 mg/m\({}^{3}\). These levels are known not to be a health concern for the lungs [6; 11]. Calcite was specifically chosen for this research because it has insignificant impacts on health. These assertions require a full investigation later in an appropriate journal. However, it can be said that there is the possibility that health impacts may be tolerable compared to the health consequences of performing no temperature mitigation. Any effect on health from aerosols needs to be weighed against any benefits. Urban heat islands have been shown to increase health consequences, so mitigating heat improves health [12]. Additionally, ecological concerns for this SRM method need to be compared to other possible SRM methods. It will be assumed that the particles are in the range of 10 to 12 microns and are uniformly distributed within that range. Some background in the production of small particles is necessary. Rotating mills with steel rods or balls produce particles with a Gaussian distribution. One pass through an air cyclone can sort out rejected particles smaller than the lower limit. Another pass through a cyclone can sort out particles that are too large and send those particles for further milling. The result is that the particles are nearly uniformly distributed over a desired range.