Hi all,
I'm trying to retrieve the aerosol radiative effects using the formulation Chylek and Wong proposed (1995), which was used in the attached article (Wang et al., 2019, equation 3). However, I'm unable to determine β, τscat, and τabs for my case. Can you help me with that?
Hello Ali Darvishi Omrani
I'd be happy to help you with your inquiry about the radiative effects of brown carbon.
To calculate the radiative effects of brown carbon, you will need several parameters, including:
1. **β (Brown Carbon Absorption Coefficient)**: This parameter represents the absorption efficiency of brown carbon aerosols and is specific to the type of aerosol and its size distribution. It characterizes how efficiently the brown carbon absorbs solar radiation. It can be determined through laboratory measurements or estimated based on previous studies and measurements of similar aerosols.
2. **τscat (Aerosol Scattering Optical Depth)**: This parameter quantifies the scattering of solar radiation by aerosols. It can be measured directly using instruments such as sun photometers or estimated using aerosol models and remote sensing data.
3. **τabs (Aerosol Absorption Optical Depth)**: This parameter quantifies the absorption of solar radiation by aerosols. Like τscat, it can be measured directly or estimated using models and remote sensing data.
To obtain these parameters for your specific case, you may need to conduct measurements or use available data sources. Here are some steps you can consider:
1. **Lab Measurements**: If possible, conduct lab measurements to determine the absorption properties of the brown carbon in your aerosols. This may involve using a spectrophotometer or similar equipment to measure the absorption coefficient (β) at various wavelengths.
2. **Field Measurements**: If conducting field measurements is feasible, you can use sun photometers, nephelometers, and other aerosol measurement instruments to directly measure τscat and τabs under different atmospheric conditions.
3. **Literature and Databases**: Research previous studies and databases that provide absorption and scattering data for brown carbon aerosols under conditions similar to your research area. This can serve as a valuable resource for estimating these parameters.
4. **Modeling**: Consider using aerosol transport and radiative transfer models. These models can help estimate τscat and τabs based on input data, including aerosol properties, atmospheric conditions, and solar radiation measurements.
Remember that obtaining accurate values for β, τscat, and τabs may require a combination of experimental measurements and modeling techniques, and the availability of data will depend on your specific research location and resources.
Some of my useful papers are:
Chapter Air Pollution and Climate Change: Relationship Between Air Q...
Article Carbon speciation of exhaust particulate matter of public tr...
Chapter Particulate Matter: Sources, Emission Rates and Health Effects
Chapter Applications of Remote Sensing
Feel free to provide more details about your research area or the data you have access to, and I can offer more specific guidance based on that information.
I tried my best to type the symbols but maybe bad. Please pardon me.
- Badges
- Science topic
- Similar topics
- Statistics
- Time Series