Hi teachers,
I’m currently using SMOKE to process the EDGAR inventory, and I’ve applied the layer_fraction.txt attached here. Could you please let me know if this approach seems reasonable?
Also, I’d like to confirm whether only sources from the ‘energy’ and ‘industry’ sectors require layered processing, while emissions files from other sectors can remain single-layered. Is that correct?
Are you using the SMOKE program layalloc to apply the vertical profiles or another method?
In hemispheric modeling platforms vertical profiles have been applied for international shipping (ships), energy, industry, and aviation. The profiles are described in section 2.1.4 of the Hemispheric TSD: https://www.epa.gov/sites/default/files/2019-12/documents/2016fe_hemispheric_tsd.pdf
The vertical profile that you shared does not appear to be appropriate for the energy sector but may be reasonable for industry where more of the emissions are released near the surface.
The aviation sector has the most complicated vertical allocation approach because it includes emissions from landing/takeoff, climbing/descent, and cruising. All of these processes occur at different elevations, although HTAP groups these processes into general domestic and international aviation sectors.
Section 3.4.1 of the HTAP v3 manuscript (ESSD - The HTAP_v3 emission mosaic: merging regional and global monthly emissions (2000–2018) to support air quality modelling and policies) recommends the use of HTAP v6.1 vertical profiles for aviation.
Hi james,
Thank you so much for your suggestions. I’ve reviewed the points from papers and real-world activity patterns of the energy, shipping, and aviation sectors, and created the following three .txt files to support the spatial and vertical allocation of emissions. Could you please help me check whether these allocations seem reasonable?
For the aviation sector, the file accounts for LTO (Landing and Take-Off), CDS (Climb and Descent), and CRS (Cruise) phases — assuming I’ve interpreted these acticities correctly.
For the shipping sector, the allocation distinguishes between international and domestic shipping.
My CMAQ simulation uses 14 vertical layers, so the allocations were designed accordingly.
energy_layer_fraction.txt (195 Bytes)
shipping_layer_fraction.txt (193 Bytes)
aviation_LTO_layer_fraction.txt (193 Bytes)
aviation_CDS_layer_fraction.txt (197 Bytes)
aviation_layer_fraction.txt (191 Bytes)
Yes, these vertical allocation profiles now look reasonable for each of the source sectors.
Thank you for your guidance！
