Simulations of Black Carbon Using Regional Models in the Urban Basin of Kathmandu
Abstract
High concentrations of black carbon (BC) are typically observed in the urban basin of Kathmandu, where a topological characteristic hinders reproducing the high observed values in models. To understand factors contributing to high concentrations of BC aerosol caused by urban basin emissions, we simulate temporal and spatial distributions of BC using two widely used regional atmospheric chemistry models (WRF-Chem and CMAQ). By comparing two model simulations, we find that the resolution of BC emission is the most important factor determining BC concentrations in the urban basin of Kathmandu. We also discover that different BC concentrations are simulated by two models despite using the same meteorological field and emission inventory for Kathmandu. In this presentation, we elaborate our findings for explaining significant differences of two simulated BC results in Kathmandu mainly focusing on loss processes to the surface such as dry deposition and vertical diffusion.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.A21C0050H
- Keywords:
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- 0312 Air/sea constituent fluxes;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0428 Carbon cycling;
- BIOGEOSCIENCES