Impact of Aerosol-PBL Interaction on Haze Pollution: Multi-Year Observational Evidences in North China
Abstract
Atmospheric aerosols have been found to influence the development of planetary boundary layer (PBL) and hence to enhance haze pollution in megacities. Previous works on aerosol-PBL interaction was mainly based on model simulation for short-term cases, so far there is a lack of long-term observational evidences. In this study, based on multi-year measurements and reanalysis meteorological data, we give observational evidences on aerosol-PBL interaction and its impact on pollution aggravation. We found a significant heating in upper-PBL with maximum temperature change about 0.7 oC on average, and a substantial dimming near surface with a mean temperature drop of -2.2 oC under polluted condition. By integrating Eulerian forward simulation and Lagrangian backward trajectory calculation, we demonstrated that the atmospheric heating was mainly induced by light-absorbing aerosols like black carbon. Then an index representing such effect was proposed, which could well characterize aerosol-PBL interaction and its impact on air pollution.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFM.A51J2291H
- Keywords:
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- 0345 Pollution: urban and regional;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0365 Troposphere: composition and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 0368 Troposphere: constituent transport and chemistry;
- ATMOSPHERIC COMPOSITION AND STRUCTUREDE: 3364 Synoptic-scale meteorology;
- ATMOSPHERIC PROCESSES