CloudMicrophysics.jl

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CloudMicrophysics.jl

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GPU-capable cloud microphysics and aerosol parameterizations for the CliMA Earth System Model

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# CloudMicrophysics.jl

CloudMicrophysics.jl provides a library of cloud microphysics and aerosol parameterizations for the [CliMA Earth System Model](https://clima.caltech.edu). It implements bulk microphysics schemes for cloud formation, precipitation, and aerosol processes, designed for high-performance climate simulations.

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| **Documentation** | [![stable][docs-stable-img]][docs-stable-url] [![dev][docs-dev-img]][docs-dev-url] |
| **Version**       | [![version][version-img]][version-url]                      |
| **License**       | [![license][license-img]][license-url]                      |
| **Tests**         | [![gha ci][gha-ci-img]][gha-ci-url]                         |
| **Code Coverage** | [![codecov][codecov-img]][codecov-url]                      |
| **Downloads**     | [![Downloads][dlt-img]][dlt-url]                            |

[docs-stable-img]: https://img.shields.io/badge/docs-stable-blue.svg
[docs-stable-url]: https://CliMA.github.io/CloudMicrophysics.jl/stable/

[docs-dev-img]: https://img.shields.io/badge/docs-dev-blue.svg
[docs-dev-url]: https://CliMA.github.io/CloudMicrophysics.jl/dev/

[version-img]: https://juliahub.com/docs/General/CloudMicrophysics/stable/version.svg
[version-url]: https://juliahub.com/ui/Packages/General/CloudMicrophysics

[license-img]: https://img.shields.io/badge/license-Apache%202.0-blue.svg
[license-url]: https://github.com/CliMA/CloudMicrophysics.jl/blob/main/LICENSE

[gha-ci-img]: https://github.com/CliMA/CloudMicrophysics.jl/actions/workflows/ci.yml/badge.svg
[gha-ci-url]: https://github.com/CliMA/CloudMicrophysics.jl/actions/workflows/ci.yml

[codecov-img]: https://codecov.io/gh/CliMA/CloudMicrophysics.jl/branch/main/graph/badge.svg
[codecov-url]: https://codecov.io/gh/CliMA/CloudMicrophysics.jl

[dlt-img]: https://img.shields.io/badge/dynamic/json?url=http%3A%2F%2Fjuliapkgstats.com%2Fapi%2Fv1%2Ftotal_downloads%2FCloudMicrophysics&query=total_requests&label=Downloads
[dlt-url]: https://juliapkgstats.com/pkg/CloudMicrophysics

## Quick Start

### Installation

```julia
using Pkg
Pkg.add("CloudMicrophysics")
Pkg.add("ClimaParams")
```

### Basic Usage

```julia
import CloudMicrophysics as CM
import CloudMicrophysics.Microphysics1M as CM1
import CloudMicrophysics.Parameters as CMP

# Create microphysics parameters
rain = CMP.Rain(Float64)
vel = CMP.Blk1MVelType(Float64).rain

# Compute rain terminal velocity
ρ = 1.2      # air density [kg/m³]
q_rai = 1e-3 # rain specific content [kg/kg]
v_term = CM1.terminal_velocity(rain, vel, ρ, q_rai)
```

### Running tests locally
```julia
# Load additional packages needed for tests
julia --project=test

# Enter Package Manager and develop locally
julia>]
pkg> dev .
pkg> instantiate

# Run the tests
julia> include("test/runtests.jl")
```

## Key Features

### 🌧️ **Bulk Microphysics Schemes**

- **0-moment scheme**: Simple precipitation removal
- **1-moment scheme**: Marshall-Palmer distributions for rain and snow
- **2-moment scheme**: [Seifert & Beheng (2006)](https://doi.org/10.1007/s00703-005-0112-4) with mass and number concentration
- **P3 scheme**: Predicted particle properties for ice

### 🧊 **Ice Nucleation**

- **Heterogeneous nucleation**: Deposition, immersion freezing ([ABIFM](https://doi.org/10.5194/acp-12-9817-2012))
- **Homogeneous nucleation**: [Koop et al. (2000)](https://doi.org/10.1038/35020537) parameterization
- **INP distributions**: [Frostenberg et al. (2023)](https://doi.org/10.5194/acp-23-10883-2023)

### 💨 **Aerosol Processes**

- **Aerosol activation**: [Abdul-Razzak & Ghan (2000)](https://doi.org/10.1029/1999JD901161) parameterization
- **Aerosol nucleation**: H₂SO₄ and organic nucleation pathways
- **Aerosol model**: Modal distributions with κ-Köhler theory

### ⚡ **High Performance**

- **Type-stable** and **GPU-compatible** (CUDA.jl, AMDGPU.jl)
- **AD-compatible** (ForwardDiff.jl) for differentiable physics
- Optimized for minimal allocations

## Documentation

- **[Getting Started](https://clima.github.io/CloudMicrophysics.jl/dev/guides/literated/GettingStarted/)** - Installation and first steps
- **[API Reference](https://clima.github.io/CloudMicrophysics.jl/dev/API/)** - Detailed function documentation
- **[Microphysics Schemes](https://clima.github.io/CloudMicrophysics.jl/dev/Microphysics1M/)** - Scheme descriptions

## Integration with Climate Models

CloudMicrophysics.jl is used throughout the [CliMA](https://github.com/CliMA) ecosystem:

- [ClimaAtmos](https://github.com/CliMA/ClimaAtmos.jl) - Atmospheric model
- [KinematicDriver](https://github.com/CliMA/KinematicDriver.jl) - 1D/2D kinematic framework
- [Thermodynamics](https://github.com/CliMA/Thermodynamics.jl) - Moist thermodynamics

## Getting Help

For questions, check the [documentation](https://clima.github.io/CloudMicrophysics.jl/dev/) or open an issue on [GitHub](https://github.com/CliMA/CloudMicrophysics.jl).

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